The option that best describes the benefit of the fact that oll never wears out is that oll never wears out, it can be used again and again.
The correct option is A.
What is the benefit of durability in materials?Durability is the ability of material to last in usage for a long time.
Duravle materials provides benefits to the owners in that it:
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If
you push on a box but the box moves backward, you have done
work.
Answer here
A spring is stretched by 0.35 m and attached to a 0.5 kg air-track glider, which is then released. The spring does 0.15 J of work on the glider as it returns to its equilibrium length. What is the value of the spring constant?
The value of the spring constant is k = 2.44 N/m
We know that work done by a spring is given by :W = [tex]\frac{1}{2} kx^{2}[/tex]
Where,
W = Work done = 0.15 J
x = stretched distance = 0.35 m
k = spring constant
Putting these values in above equation we get, k = 2.44 N/m
Spring is an object which extends or compresses on applying force. The force required should be more than the spring constant (k) to displace the spring from its equilibrium position. We use the work done by the spring formula to calculate this force. Spring also possess potential energy. For calculating the potential energy of a spring, we use Hooke’s Law. Consider a spring, when we apply force on one side of the spring, it will get compressed, as they are elastic. At this time the spring exerts its force in the direction opposite to the applied force, to expand to its original size.To know more about work visit:
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In what sport is reaction time LEAST likely to make an impact on an athlete’s performance?
A.) Karate
B.) Baseball
C.) Tennis
D.) Golf
I think D. golf is the answer
the progressive nucleation of minerals from the melt leaves the magma depleted in certain elements. this change in magma composition is called magmatic differentiation and accounts for the great variety of igneous rocks found in nature. the separation of liquid and solid phases through crystal settling further contributes to this diversity.
A mineral association that should not be found in nature would be a rock that contains both early-forming mafic minerals (such as olivine, pyroxene, and amphibole) and late-forming felsic minerals (such as plagioclase feldspar, quartz, and potassium feldspar) together in the same rock.
What is Bowen's reaction series and Crystal settling?Bowen's reaction series is a model that describes how different minerals crystallize from a cooling magma or lava. The minerals that crystallize first, called early forming minerals, are generally rich in iron and magnesium and include olivine, pyroxene, and amphibole. Later-forming minerals, on the other hand, are typically rich in silicon and aluminum and include plagioclase feldspar, quartz, and potassium feldspar.
Crystal settling is the process by which heavier, denser minerals settle to the bottom of a magma chamber due to gravity, while lighter, less dense minerals remain suspended in the magma. This process can occur as the magma cools and solidifies, or as the magma is intruded into existing rock.
Given this information, a mineral association that should not be found in nature would be a rock that contains both early-forming mafic minerals (such as olivine, pyroxene, and amphibole) and late-forming felsic minerals (such as plagioclase feldspar, quartz, and potassium feldspar) together in the same rock. Because these minerals crystallize out at different temperatures and pressures, it is unlikely that they would be found together in the same rock unless there was some form of re-melting or re-crystallization that brought them together.
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Why does heating water affect surface tension
As temperature increases, molecules of liquid become more active and they move more rapidly.
as the box is sliding down the ramp how are the magnitudes of the horizontal and the vertical components of the box's velocity changing
From free body diagram ma = mgsin - mgco.as the box is sliding down the ramp how are the magnitudes of the horizontal and the vertical components of the box's velocity changing.
what is magnitudes of the horizontal and the vertical components of the box's velocity changing?
The horizontal velocity of a projectile is constant (a never changing in value), There is a vertical acceleration caused by gravity; its value is 9.8 m/s/s, down, The vertical velocity of a projectile changes by 9.8 m/s each second, The horizontal motion of a projectile is independent of its vertical motion.This is accomplished by taking the magnitude of the vector times the cosine of the vector's angle to find the horizontal component, and the magnitude of the vector times the sine of the vector's angle to find the vertical component.The magnitudes of the components of velocity v → v → are v x = v cos θ and v y = v sin θ , v x = v cos θ and v y = v sin θ , where v is the magnitude of the velocity and θ is its direction relative to the horizontal.To learn more about components refers to:
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How does the right ascension of the sun compare with the sidereal time at solar noon
The right ascension of the sun compare with the sidereal time at solar noon in the sense that the sidereal time is just the right ascension that is on the meridian. The sidereal time increases by approximately 15 degrees every hour of time because of the rotation of the sky.
What is the sidereal time?Sidereal time is described as a timekeeping system that astronomers use to locate celestial objects.
The constellations and lines of right ascension are all painted on the globe. The Earth's rotation makes it look like the sky globe rotates east to west once every 23 hours 56 minutes 4 seconds.
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one million cubic meters of a clay slurry (saturated soil with high water content) generated as part of a dredging project are subjected to vacuum preloading (essentially a way to accelerate compression and dewatering of the slurry) for a period of 3 years. initially, the slurry has a water content of 120%. 3 years later, the water content decreases to 72%. knowing that the specific gravity of the solids (gs) is 2.72, determine the change in volume (in m3 ) that has taken place during the 3 years.
The change in volume over the 3 year period is 400,000 m3.
What is volume?Volume is a measure of the three-dimensional space an object occupies. It is commonly measured in liters, cubic meters, or gallons. In physics, volume is the measure of an object's capacity to contain matter or energy.
The change in volume over the 3 year period is calculated using the formula:
Change in Volume = Total Volume * (1 - Final Water Content/Initial Water Content)
In this scenario, the Total Volume is 1,000,000 m3, the Initial Water Content is 120%, and the Final Water Content is 72%. Plugging these values into the formula, we get:
Change in Volume = 1,000,000 m3 * (1 - 72%/120%)
Change in Volume = 1,000,000 m3 * (1 - 0.6)
Change in Volume = 1,000,000 m3 * 0.4
Change in Volume = 400,000 m3
Therefore, the change in volume over the 3 year period is 400,000 m3.
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true/false. three particles of identical mass m are acted on only by their mutual gravitational attraction. they are initially located at the vertices of an equilateral triangle with sides of length l. consider the motion of any one particle about the com of the system, g and using g as the origin of the inertial frame, find the angular velocity required to keep l constant
True, the three particles of identical mass m are acted on only by their mutual gravitational attraction when located at the vertices of an equilateral triangle with sides of length l.
To keep l constant, the angular velocity required for the motion of any one particle about the center of mass (COM) of the system, g, needs to be calculated.
This can be calculated by using the equation
ω = √[G × m × (1/l³)].
In this equation, G represents the gravitational constant and m is the mass of the particles. Thus, the angular velocity required to keep the sides of the triangle of length l constant is equal to √[G × m × (1/l³)].
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If you could drive a Jetson's flying car at a constant speed of 160km/hr (100 mi/hr) across oceans
and space, approximately how long would it take to drive to the nearest star, Alpha Centauri (4.4
light-years away)?
30 million years
30 trillion years
30 millenia years
30 billion years
Driving to the nearest star, Alpha Centauri, would take 26.4 million kilometers.
What is speed?Speed is the rate at which an object moves along a path in time, whereas velocity is the rate and direction of movement. In other words, velocity is a vector, whereas speed is a scalar value. The rate at which an object's position changes in any direction. Speed is defined as the ratio of distance traveled to time spent traveling. The direction of movement of the body or object is defined by velocity. Speed is fundamentally a scalar quantity. Velocity is, in essence, a vector quantity. It is the rate at which distance changes. It is the displacement rate of change.
Here,
speed=distance/time
time=distance/speed
=4.4*9.46 trillion kilometers/160
=26.4 million kilometer
It would take 26.4 million kilometer to drive to the nearest star, Alpha Centauri.
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we’re both the marble and metal ball equally successful when released form the same drop point on the mini rollercoaster
help immediately
that both balls will experience an elastic collision before rebounding to the same height after being launched from rest at the an altitude of 5.0 meters with a mass of one kilo gram.
when two identically sized bodies collide head-on during an elastic collision?Head-on collisions between projectiles and immobile objects of same mass result in The target will continue to travel away in the same pace after the missile stops. The velocities, or speeds, are switched as a result, and the momentum gets switched as well.
Why does the beginning of every roller coaster be a drop?Obviously, gravity! Gravity takes over as soon as a roller coaster peaks the very first significant hill, forcing the ride to descend at a constant pace of 9.8 m per second squared.
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the same atom can produce either an emission spectrum or an absorption spectrum depending on how the atom's electrons and light interact. below you see two spectra (one emission and one absorption) created by an element. according to the bohr model, different spectral lines are caused by different electron transitions in the atoms of that element. for each of the spectral lines indicated, pick the appropriate electron transition in the atom that is responsible for creating the spectral line.
The Bohr model states that when an electron in an atom jumps from one energy level to another, it releases energy in the form of light and produces an emission spectrum.
An absorption spectrum happens when light is absorbed by an atom, which causes electrons to jump from low energy levels to high energy levels.
The energy difference between the two levels involved in electron transfer is reflected in a specific spectral line in the emission or absorption spectrum.
The generation of spectral lines in the emission and absorption spectra of this element is caused by its atomic electronic transitions.
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The question is -
The same atom can produce either an emission spectrum or an ion spectrum depending on how the atom's electrons and light (one emission and one absorption) are created by an element. According to the Bohr model, different ed by different electron transitions in the atoms of that element. For each of the spectral lines indicated, pick the appropriate electron transition in the atom that is responsible for creating the spectral line. Absorption spectrum Emission spectrum 3OF9 6 1 8 2.
The figure shows the angular velocity for a system as a function of time. Assume all the horizontal divisions are in seconds and all the vertical divisions are in rad/s. At t = 0 s the system is at a position of -1 rad.
What is the angular acceleration in rad/s2 at t = 4 s?
What is the change in angular position between 0 and 2 s in radians?
What is the final angular position, in degrees, after the entire 6 s interval?
If the system has a radius of 40 cm, how fast is a point on the outermost edge moving at t = 1 s in m/s?
If the system has a radius of 40 cm, what is the tangential acceleration on a point on the outermost edge at t = 0.5 s in m/s2?
The graph shows that the final angular position depends on the angular acceleration at time t = 4 s and the angular position between 0 and 2 s, which is represented by -1/4 rad/sec2 and -1/2 rad, respectively (0, 6).
In physics, angular acceleration refers to how quickly angular velocity changes over time. Since spin angular velocity and orbital angular velocity are two distinct types of angular velocity, respectively, there are also two distinct types of angular acceleration. Spin angular acceleration and orbital angular acceleration are the names for these.
The change in angle between 0 and 2 seconds is equivalent to -(1/4)*2 = -1/2 rad. Angle acceleration is equivalent to dv/dt = -1/4 rad/sec2 at 4 seconds.
The graph shows degrees as the ultimate angular position after the whole 6 s interval (0, 6).
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A cart of mass m moving at 12 m/s to the right collides elastically with a cart of mass 4.0 kg that is originally at rest. After the collision, the cart of mass m moves to the left with a velocity of 6.0 m/s. Assuming an elastic collision in one dimension only, what is the velocity of the center of mass (V_cm) of the two carts before the collision? 2.0 m/s 3.0 m/s 6.0 m/s 9.0 m/s 18 m/s
The velocity of the center of mass (V_cm) of the two carts before the collision is between 3.0 m/s and 0.3 m/s.
What is collision?Collision is a term used to describe the physical impact between two or more objects. It is a phenomenon that occurs when two or more objects, such as cars, collide with each other, resulting in a transfer of energy from one to the other.
The velocity of the center of mass (V_cm) of the two carts before the collision can be calculated using the conservation of momentum equation:
V_cm = (m*V_1 + 4.0 kg*V_2) / (m + 4.0 kg)
Where V_1 is the initial velocity of the first cart (12 m/s) and V_2 is the initial velocity of the second cart (0 m/s).
Substituting values, we obtain:
V_cm = (m*12.0 m/s + 4.0 kg*0 m/s) / (m + 4.0 kg)
V_cm = 12.0 m/s / (m + 4.0 kg)
Since the mass of the first cart (m) is unknown, we cannot calculate the exact value of V_cm. However, we can calculate the maximum and minimum values of V_cm. For the minimum value, we assume m = 0, and for the maximum value, we assume m = ∞.
Minimum value: V_cm = 12.0 m/s / (0 + 4.0 kg) = 3.0 m/s
Maximum value: V_cm = 12.0 m/s / (∞ + 4.0 kg) = 0.3 m/s
Therefore, the velocity of the center of mass (V_cm) of the two carts before the collision is between 3.0 m/s and 0.3 m/s.
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two rather unequal cars are competing in a drag race. for simplicity, let's assume that the accelerations of the cars are constant. car 1 has an acceleration of 3.5 m/s2, while car 2 has an acceleration of 6.1 m/s2. car 2 gets off to a late start, 1.1 seconds after car 1.
1.) Car 2 will overtake car 1 at t = 0.828 seconds after car 1 took off. 2.) Point of overtaking will happen at a distance of 2.69 m from the starting point. 3.) Car 2 will be 3.71 m/s faster than Car 1 at the point of overtaking.
What is Acceleration?In mechanics, acceleration is the measure of how quickly the velocity of an object changes in relation to time.
1.) As, distance = initial velocity * time + (1/2) * acceleration * time^2
Given, car 1 has an acceleration of 3.5 m/s^2 and car 2 has an acceleration of 6.1 m/s^2.
So, distance = (6.1 m/s^2) * (t + 1.1)^2 = (3.5 m/s^2) * t^2
Therefore, car 2 will overtake car 1 at t = 0.828 seconds after car 1 took off.
2.)As, distance = initial velocity * time + (1/2) * acceleration * time^2
Let t be the time it takes for car 2 to overtake car 1, as calculated above t=0.828 seconds.
distance covered by car 1
distance = (1/2) * 3.5 m/s^2 * t^2 = (1/2) * 3.5 m/s^2 * 0.828^2 = 0.907 m
And distance covered by Car 2 is:
distance = (1/2) * 6.1 m/s^2 * (t+1.1)^2 = (1/2) * 6.1 m/s^2 * (0.828+1.1)^2 = 2.69 m
Therefore, point of overtaking will happen at a distance of 2.69 m from the starting point.
3.) As we know, velocity = acceleration * time
point of overtaking is at t = 0.828 seconds after car 1 took off.
So, Velocity of Car 1 at the point of overtaking is:
velocity = 3.5 m/s^2 * 0.828 sec = 2.94 m/s
Velocity of Car 2 at the point of overtaking is:
So, velocity = 6.1 m/s^2 * (0.828 + 1.1) sec = 6.65 m/s
Therefore, Car 2 will be 6.65 m/s - 2.94 m/s = 3.71 m/s faster than Car 1 at the point of overtaking.
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Note: The question given on the portal is incomplete. here is the complete question.
Question: Two rather unequal cars are competing in a drag race. for simplicity, let's assume that the accelerations of the cars are constant. car 1 has an acceleration of 3.5 m/s2, while car 2 has an acceleration of 6.1 m/s2. car 2 gets off to a late start, 1.1 seconds after car 1.
1. At what time after Car 1 took off will it be overtaken by Car 2?
2. How far down the track will this happen?
3. How much faster will Car 2 be than Car 1 by that time?
Explain the following (i) International standard (ii) Primary standard (li) Sccondary standard and (iv) Working standard
Explanation:
International standard: An international standard is a set of guidelines, specifications, or measurements that have been agreed upon by a group of countries or international organizations. These standards are typically used to ensure consistency and compatibility in areas such as trade, technology, and safety. International standards are often used to facilitate international trade and communication, and to ensure that products and services meet certain quality and safety requirements.
(ii) Primary standard: A primary standard is a standard that is considered to be the most accurate and reliable standard available for a particular measurement. These standards are typically used as the reference point for all other standards of that measurement. Primary standards are often used in scientific research and in the calibration of other standards.
(iii) Secondary standard: A secondary standard is a standard that is used to calibrate other instruments or standards. It is typically less accurate than a primary standard, but still considered to be of high precision. Secondary standards are often used in industry, research, and other areas where accurate measurements are required, but a primary standard is not practical or cost-effective.
(iv) Working standard: A working standard is a standard that is used in day-to-day operations and is typically less accurate than a secondary standard. It is used to calibrate equipment or instruments that are used in regular operations and it's typically less expensive to use than a secondary standard. A working standard is used to ensure that the equipment is operating correctly and within the acceptable limits of accuracy.
In summary, International standards are agreed upon by a group of countries or international organizations and are used to ensure consistency and compatibility
from the list below, select the ingredient that is not necessary for the national weather service to issue a blizzard warning.
Bitterly cold air with wind chill temperatures is not required for the national weather service to issue a blizzard warning.
What is weather service?The National Weather Service (NWS) forecasts and issues warnings for weather, hydrologic, and climate conditions for the United States, its territories, adjacent waters, and ocean areas, with the goal of protecting lives and property and boosting the national economy. Weather forecasting services use science and technology to forecast atmospheric conditions. Advances and improvements in forecasting software have allowed digital satellite imagery, radar imagery, model data, and surface observations to more accurately predict weather conditions. Within the Department of War, it was assigned to Brigadier General Albert J. Myer's Signal Service Corps. The National Weather Service was given its first name by General Meyer: The Division of Telegrams and Reports for the Benefit of Commerce.
Here,
The national weather service does not need bitterly cold air with wind chill temperatures to issue a blizzard warning.
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Complete question:
from the list below, select the ingredient that is not necessary for the national weather service to issue a blizzard warning.
a. Bitterly cold air with wind chill temperatures below -18F
b. Falling or blowing snow
c. Reduced visibility to 1/4 mile or less
d. 30 kt (35 mph) sustained winds
I need someone to graph this for me if possible
Here is the formula for the problem
X Axis = 30°/25 DIV = 12 °C/DIV
Y Axis = 6.0cm/19 DIV = 0.3157 => 0.32 cm/DIV
NEED THIS BY 11 PM EST THIS WAS POSTED ON 1/24/2023
To make a graph with the data in the table, we must place the data in a column on the x-axis and the other data on the y-axis to organize the information correctly.
How to make a graph with the information from the chart?To make a graph with the information in the table, we must identify what type of table would serve to relate the data in the table. In this case, a line graph would be useful because it has the purpose of demonstrating the differences of an object over time or subjected to different conditions.
In this case, we want to demonstrate the influence that temperature has on the height of a plant. Therefore, we put the temperature on the y axis and the height of the plant on the x axis.
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A constant net force, F net is applied to a cart with mass,m, causing an acceleration,a. If the mass of the cart is doubled, but the net force remains the same, what will the acceleration of the car be?
The acceleration will be halved. That is a = Fnet / (2m) .
What is acceleration?This refers to the rate of change of velocity. It is the speed that is changing but not at all times. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.
Solving for the acceleration:
The acceleration of the car will be halved. This is because the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
The equation for acceleration is:
a = Fnet / m.
So if the mass of the cart is doubled but the net force remains the same, the acceleration will be halved.
a = Fnet / (2m)
Hence, the acceleration of the car be a = Fnet / (2m).
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A uniform brick of length 24 m is placed over the edge of a horizontal surface with a maximum overhang of 12 m attained without tipping.
The maximum overhang possible for the two bricks (without tripping) is 15m.
What is the detailed solution to the above question?Given,
Length of the brick (L) = 24m
Maximum overhang = 12m
Length of second brick = 24m
Maximum overhang for two bricks =?
Now,
Generally, the equation for the value x (mid-point joining the bricks) is given as,
x = 0.25 × L
=0.25 × 12
= 3m
Hence,
The maximum overhang possible for the two bricks (without tripping) will be,
L₀ = L/2 + x
= 24/2 + 3
= 12 + 3
= 15m
Therefore, The maximum overhang possible for the two bricks (without tripping) is 15m.
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chapter 5 - problem 6. an eccentric inventor attempts to levitate a cork ball by wrapping it with foil and placing a large negative charge on the ball and then putting a large positive charge on the ceiling of his workshop. instead, while attempting to place a large negative charge on the ball, the foil flies off. explain.
The foil flew off because of static electricity. When the inventor attempted to place a large negative charge on the ball, the negative charge caused an imbalance of electrons between the ball and the foil.
What is static electricity?Static electricity is a form of electrical energy that occurs when electric charge accumulates on the surface of an object. It is created when two objects that have a different electrical charge come into contact and then separate, causing electrons to move from one object to the other.
This caused an electric field to form between the ball and the foil, generating an electrostatic force which repelled the foil away from the ball.
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what planet has 1/10 of earth's gravity Show all work
The planet that has ⅒ of the earth's gravity is the moon.
What is gravity?Gravity is the force exerted by any object with mass on any other object with mass.
Gravity is the force on Earth's surface, of the attraction by the Earth's masses, and the centrifugal pseudo-force caused by the Earth's rotation, resulting from gravitation.
The gravity on the planet Earth is 1 with a acceleration due to gravity of 9.8m/s². One-tenth of this is 0.1 (0.98m/s²).
The planet with the above gravity is the moon with a gravity of 0.166.
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Which of the following wave characteristics remain unchanged when a wave crosses a boundary into a different medium?
A. frequency, B. amplitude, C. wavelength, D. velocity
E. direction
Wave characteristics that remain unchanged are A. Frequency and E. Direction.
Frequency and direction are the only Wave characteristics that don't change when a wave crosses a barrier into a new medium. No matter what medium a wave is travelling through, frequency refers to the rate of change of a wave per unit of time. The wave's direction dictates how it will interact with other materials and objects along its course, as well as how it will be oriented.
But when a wave enters another medium, its wavelength and speed do alter. The wave's length, which varies depending on the medium it is travelling through, is the space between its two successive crests or troughs. The wave's velocity, which also varies when it encounters a different medium, is its speed. This is so because the characteristics of the medium the wave is travelling through affect its speed.
The wave's amplitude, which is likewise altered when it passes a boundary into a new medium, is its largest departure from its resting point. This is so because the material the wave is going through has an effect on the energy of the wave, which determines the amplitude.
As a result, when a wave crosses a boundary and enters a new medium, its wavelength, velocity, and amplitude all vary based on the characteristics of the new medium but its frequency and direction stay the same.
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figure 22-47 shows two paral- lel nonconducting rings with their central axes along a common line. ring 1 has uniform charge q1 and ra- dius r; ring 2 has uniform charge q2 and the same radius r. the rings are separated by distance d 3.00r.the net electric field at point p on the common line, at distance r from ring 1, is zero.what is the
The value of the force P at which the space between the polyethylene bar and the steel tube will be closed is 88,120 lbf.
What is Poisson's ratio?Poisson's ratio is a measure of the relationship between the longitudinal and transverse strains in a material. It is defined as the ratio of the change in the width per unit width (transverse or lateral strain) to the change in length per unit length (longitudinal or axial strain) caused by an applied load. The ratio typically ranges between 0 and 0.5 for most materials.
The value of the force P at which the space between the polyethylene bar and the steel tube will be closed can be calculated using the formula P = (π/4) * E * (d1^4 - d2^4)/(d1^4)
Given that E = 200 ksi and d1 = 4.0 in, d2 = 4.01 in
P = (π/4) * 200000 * (4.0^4 - 4.01^4)/(4.0^4)
P = 8.812 * 10^4 lbf
So the value of the force P at which the space between the polyethylene bar and the steel tube will be closed is 88,120 lbf.
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Pls help need answers
The angular diameter of Mars in radians and in arc minutes and the evaluation of the capability of human eyes to resolve Mars of diameter 6.8 × 10³ km, located 5.5 × 10⁷ km away are as follows;
(d) The angular diameter of Mars is 1.23[tex]\overline{63}[/tex] × 10⁻⁴ rad
(e) The angular diameter in arc minutes is about 0.425 arc minute.
Optical aid is required for humans to resolve Mars.What is an angular diameter?The angular diameter is an apparent dimension used to describe the size of a circular object, observed from a specified point of view or location.
The diameter of Mars = 6,800 km
The closest distance between Mars and Earth when Mars gets closest to Earth = 55,000,000 km
(d) The angular diameter of Mars can be obtained by finding the vertex angle formed by the diameter of Mars and the ray from the observer on Earth to the left and right extremities of Mars using the trigonometric ratio of tangent as follows;
Angular diameter = 2 × arctan((6,800/2)/55,000,000) = 0.000123636363 radians
The angular diameter of Mars as observed from Earth is 1.23[tex]\overline{63}[/tex] × 10⁻⁴ radians
(e) 1 radians = 3437.75 arc minute
0.000123636363 radians = 0.000123636363 × 3437.75 arc minute
0.000123636363 × 3437.75 ≈ 0.425
Therefore;
0.000123636363 radians ≈ 0.425 arc minute
The specified level of detail that the human eye can resolve is one arc minute (1')
The apparent angular diameter of Mars, which is about 0.425 arc minute is lesser than the angular limit of detail of one arc minute that the eye can resolve, therefore, humans can not resolve Mars without optical aid.
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When a certain metal is illuminated by light, photoelectrons are observed provided that the wavelength of the light is less than 669 nm. Which one of the following values is closest to the work function of this metal? (h=6.626 x 10^-34 Js, c = 3.00 x10^8 m/s, 1 eV = 1.60 x10^-19)
A.) 1.9 eV
B.) 2.3 eV
C.) 2.0 eV
D.) 2.2 eV
The work function of this metal is 1.9 eV
The work function (or work function) is defined as the minimum amount of thermodynamic work (i.e. energy) required to remove an electron from a solid to a point in the vacuum immediately outside the solid surface.When light of suitable frequency falls on a metal surface, electrons are emitted. These photo (light) generated electrons are called photoelectrons.Due to the attraction of this positive image, the negative electron turns back to metal surface hence cannot leave the metal crystal permanently. But to overcome this attraction force an electron requires sufficient energy supplied from outside usually from external light sources. The minimum energy required just to escape an electron from a metal surface is known as work function.We know that Work function is defined by : W = hc/λ
Where, h = planck's constant = 6.62 x 10^(-34) J/Hz
c = speed of light = 3 * 10^(8) m/s
λ = wavelength = 669 nm = 669 * 10^(-9)m
Putting these values in equation we get: W = 0.030 * 10^(-17) J
To convert it in eV we divide this by 1ev = 1.60 x10^(-19)
Doing so we get W = 1.9 eV
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The impulse an object experiences is the
product
of the
[ Select ]
and
[ Select ]
, and its unit is
[ Select ]
or
[ Select ]
.
Answer:
Explanation:
Impulse is the product of force and time
there for it unit will be [Newton seconds]
Identify and draw the forces that act on the pencil. Be certain to draw each force at the correct location (the point at which the force acts on the pencil). The black dot represents the center of gravity of the pencil. Draw the vectors starting at the points where the forces act on the pencil.
A force is a push or pull upon an object resulting from the object's interaction with another object.
What is force?Consequently, this implies that in this situation, the direction of the frictional force should be to the right. Let me now just illustrate this scenario. Therefore, the gravitational force that is always added at the center of mass will act in the same manner, moving towards the center of the earth.The normal force, which is always parallel to the surface of contact, looks like this. That is the gravitational force,There is a solution to this issue since, as I mentioned to the right, we also have the frictional force.A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects.To learn more about force refer to:
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Evaluate the numerical value of the final momentum of the t-shirt using the results from Parts A and B. View Available Hint(s) ПиА ?
Final velocity is vf = 55 m/s.
In this case, we are using the concept of impulse and change in momentum.
Ft = m(vf – vi), where vf is the final velocity and vi is the initial velocity.
Substituting in the given values with units:
(10 N)(10 s) = (2 kg)(vf – 5 m/s)
so the final velocity = vf = 55 m/s.
What is momentum?In Newtonian mechanics, an object's mass and velocity are combined to form momentum, more precisely linear momentum or translational momentum. It has both a magnitude and a direction, making it a vector quantity. If an item has a mass of m and a velocity of v (also a vector quantity).
The kilogramme metre per second (kg m/s), or newton-second in the International System of Units (SI), is the unit used to measure momentum.
The rate of change of a body's momentum is equal to the net force exerted on it, according to Newton's second law of motion. Depending on the frame of reference, momentum is a conserved quantity in any inertial frame, which means that if a closed system is not impacted by external force.
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The Weather Monitor. Your South American expedition splits into two groups: one that stays at home base, and yours that goes off to
set up a sensor that will monitor precipitation, temperature, and sunlight through the upcoming winter. The sensor must link up to a
central communications system at base camp that simultaneously uploads the data from numerous sensors to a satellite. In order to
set up and calibrate the sensor, you will have to communicate with base camp to give them specific location information.
Unfortunately, the group's communication and navigation equipment has dwindled to walkie-talkies and a compass due to a river-raft
mishap, which means your group must not exceed the range of the walkie-talkies (3.0 miles). However, you do have a laser rangefinder
to help you measure distances as you navigate with the compass. After a few hours of hiking, you find the perfect plateau on which to
mount the sensor. You have carefully mapped your path from base camp around lakes and other obstacles: 500 m West (W), 240 m S,
770 mW, 980 m NE, 860 m W, and 420 m 30.0° W of S. The final leg is due south, 2.00 km up a constant slope and ending at a plateau
that is h= 360 m above the level of base camp.
(a) How far are you from base camp? Will you be able to communicate with home base using the walkie-talkies?
(b) What is the geographical direction from base camp to the sensor (expressed in the form 8° south of west, etc.)?
(c) What is the angle of inclination from base camp to the detector?
(a) Number i
(b) Number
(c) Number
The total distance from base camp to the sensor is 4.23 km.
What is the angle of inclination from base camp to the detector?You are 3.8 km from base camp. The walkie-talkies have a range of 3.0 miles, which is 4.8 km, so you will be able to communicate with home base.The direction from base camp to the sensor is approximately 32° south of west.The angle of inclination from base camp to the detector is approximately 15.8°.This is well within the range of the walkie-talkies, so communication with base camp should not be a problem.The geographical direction from base camp to the sensor is 14.4° south of west.This can be calculated by adding up the angles of the course taken and then calculating the angle of the resultant vector.The angle of inclination from base camp to the detector is 43.2°.This can be calculated by taking the difference between the height of the plateau and the height of base camp, and then dividing that by the distance between them.This information is necessary for the group to be able to accurately calibrate the sensor at the correct location.To learn more about The angle of inclination refer to:
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