Answer:
0.612 kilograms.
Explanation:
To solve this problem, we need to use the definition of work as the product of force and displacement.
(a) The work done on the book is the force applied to it multiplied by the distance through which it is moved. In this case, the force applied to the book is its weight, which is 6 newtons. The displacement of the book is 2 meters, because it is moved from one shelf to another shelf that is 2 meters higher. Therefore, the work done on the book is 6 newtons * 2 meters = 12 joules.
(b) The next person to take the book from the shelf accidentally drops it. When an object is dropped, it accelerates due to the force of gravity, which is 9.8 m/s². Since the force of gravity is the same for all objects, we can use the acceleration of the book to calculate its mass. Specifically, we can use the formula F = ma, where F is the force acting on the object (in this case, the force of gravity), m is the mass of the object, and a is its acceleration.
In this case, the force acting on the book is its weight, which is 6 newtons. The acceleration of the book is 9.8 m/s². Therefore, we can solve for the mass of the book using the formula F = ma: 6 newtons = m * 9.8 m/s². This simplifies to m = 6 newtons / 9.8 m/s² = 0.612 kilograms.
In summary, the work done on the book when it is picked up and moved to a higher shelf is 12 joules, and the mass of the book is 0.612 kilograms.
When a piece of metal is heated to high temperatures, it begins to glow red, and then white, as its temperature increases. Does this phenomenon provide evidence for the wave model or the particle model of light? why?.
Answer:
The particle model, because the metal is only absorbing radiation. of specific frequencies.
Explanation:
When a piece of metal is heated to high temperatures, it begins to glow red, and then white, as its temperature increases.
4. A meteorite travels at 15 km/s before reaching Earth's
atmosphere. Calculate how far it travels in 12 s. (Distance)
Answer:
180 km
Explanation:
velocity (v) = distance (s) / time (t)
From there we get that the distance is: s=v*t
s = 15 km/s * 12 s
s =180 km
Wave motion is characterized by two velocities: the velocity with which the wave moves in the medium (e. G. , air or a string) and the velocity of the medium (the air or the string itself). Consider a transverse wave traveling in a string. The mathematical form of the wave is.
a) The velocity of propagation of the wave V=w/k
b) The y velocity v_y(x,t) of a point on the string as a function of x
v=-wAcos(kx-wt)
What is a wave?
A wave can be described as a disturbance that travels through a medium from one location to another location
y(x,t)=Asin(kx−ωt) defines the wave equation.
a)The velocity of propagation of the wave
We are asked to find wave speed (v)
Recall that v = fλ
From the wave equation above,
k = 2π/ λ where k is the wave number and λ is the wavelength, λ = 2π /k
ω = 2πf where f is the frequency and ω is the angular frequency.
f = ω/ 2π.
By substituting for λ and ω into the wave speed formulae, we have that
v =( ω/ 2π) × (2π /k)
v = ω/k
b)The y velocity v_y(x,t) of a point on the string as a function of x
y(x,t)=Asin(kx−ωt)
The first derivative of y with respect to x give the velocity (vy)
By using chain rule, we have that
v = dy/dt = A cos( kx −ωt) × (−ω)
v = - ωAcos( kx −ωt)
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the coefficient of kinetic frition between an object and the surface upon which it is sliding is 0.10. the mass of the object is 8.0 kg. what is the force of friction
The force of friction is 0.8 N.
Friction is the force that prevents motion when the surface of one object comes into contact with the surface of another.
It also has the same SI unit as other forces have as Newton (N).Frictional force can be calculated by the formula F = μ * Fnμ is the coefficient of friction between the surfaces which are in the contact.
Fn is the normal force acting on the object due to its mass.
Mass of the object = m = 8.0 kg
coefficient of kinetic friction between an object and the surface upon which it is sliding = 0.10
Frictional force = F = 8.0 * 0.10
F = 0.8 N
The force of friction is 0.8 N.
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The expansion of the universe after its origin takes place by a phenomenon called.
Expansion of the universe after its origin takes place by a phenomenon called inflation.
What is inflation?In physical cosmology, a theory of exponential expansion of space in the early universe is called inflation.Prior to the Big Bang, the universe underwent a breathtaking cosmic expansion, doubling in size in a fraction of a second. This rapid inflation, fueled by energy that permeated empty space and left the universe desolate and cold.The Big Bang theory explains how the universe got from the hot dense state of the early universe to the cold dense state whereas cosmic inflation is an explanation of some properties of the cosmic microwave background radiation.Phenomena can be defined as “observable events that occur in a natural or designed system.” They are everywhere around us, but some are easier to notice than others. Common examples of natural phenomena include lightning, earthquakes, tsunamis, volcanic eruptions, tornadoes, and similar.The natural phenomena in the given crossword are cyclone, thunder, storm, lightning, typhoon and hurricane.To learn more about phenomenon refer to:
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a salesperson claims a 960 kg car has an average acceleration of 5 m/s2 from a standing start to 100 km/h. what average net force is required to do this?
The average net force will be 4.8× [tex]10^{3[/tex] N
What is acceleration?Acceleration describes the speed and direction changes in velocity over time. Acceleration refers to the change in speed or direction of an item or point traveling straight forward.
The average force is what?The force applied by a body that's travelling at a definite velocity (rate of speed) for a definite period of time is the average force. Force is a vector quantity that has both magnitude and direction.
The vehicle weighs 960 kg, or m. The car's average speed is
a = 5m/s2 Newton's Second Law of Motion states that a particle's mass times its typical acceleration equals the average force that is applied 5 m/s2.
average net force (F) operating will be
F = ma
F = 960*5
F = 4.8× [tex]10^{3[/tex] N
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quadrasteer steering systems are being discussed. technician a says at low speeds, the rear wheels turn in the same direction as the front wheels. technician b says at high speeds, the rear wheels turn in the direction opposite to the front wheels. who is correct?
Neither a or b is correct.
What is speed?
An object's velocity (commonly denoted by v) is the rate of change of position over time, or the rate of change of position per unit time. So it's a scalar quantity. The average velocity of an object over a time interval is the distance traveled by the object divided by the duration of the interval. The instantaneous velocity is the limit of the average velocity as the time interval approaches zero. Velocity is not the same as speed.
Velocity is the dimension of distance divided by time. The SI unit for speed is meters per second (m/s), but the most common everyday speed units are kilometers per hour (km/h) or miles per hour (mph) in the US and UK. ). Knots are widely used in air and sea travel.
According to special relativity, the fastest speed at which energy or information can travel is the speed of light in a vacuum c = 299792458 meters/second (approximately 10790000000 km/h or 671000000 mph). Matter can never fully reach the speed of light because it requires infinite energy. In relativity physics, the concept of velocity replaces the classical idea of velocity.
Therefore, Neither a or b is correct
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a 0.3175 cm sphere of glucose is placed in a water stream flowing at a rate of 0.15 m/s. the temperature of water is 25 °c. the diffusivity of glucose in water is 0.69 x 10 -5 cm2/s. estimate the mass transfer coefficient.
The mass transfer coefficient, based on the provided statement, is 6.16*10⁻¹² m/s.
What does physics mean when it refers to temperature?Temperature is a unit used to represent hotness or coolness on any of a number of scales, includes Fahrenheit and Celsius. According to temperature, heat energy will naturally move from a hotter (body with a temperature higher) to a colder (body with a temperature lower) (one at a lower temperature).
Briefing:Given,
Diameter of glucose sphere,
D = 0.3175cm
D= 0.003 m
Velocity, V = 0.15m/s
Mass diffusivity, [tex]D_{AB}[/tex] = 0.69*10⁻⁵cm²/s
For flow around sphere
[tex]\text { Sh }=\frac{K_C D}{D_{A B}}=2+0.554 Re^{1 / 2} Sc^{1 / 3}[/tex]
Sh = Sherwood number
D = diameter of sphere
[tex]k_{c}[/tex] = Mass transfer coefficient
[tex]D_{AB}[/tex] = Diffusivity
[tex]R_{e}[/tex] = DVρ/M
Diameter (D) = 0.003m
Velocity (V) = 0.15m/s
ρ = Density of water at 25°C = 996kg/m³
M = Viscosity of water at 25°C at 10⁻³ Pa
[tex]R_{e}[/tex] = 0.003*0.15*996/10⁻³
[tex]R_{e}[/tex] = 448.2
Sc = Schmidt no.
For water at 25°C
Sc = 1.6 (From thermodynamics table)
Kc * 0.003/6.9*10⁻⁸ = 2 + 0.554 ([tex]448^{1/2}[/tex])[tex](1.6^{1/3})[/tex]
4.34*10⁻¹² Kc = 26.76
Kc = 6.16*10⁻¹² m/s
This is the mass transfer coefficient.
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The complete question is-
Determine the mass transfer coefficient, kc, for the transfer from a glucose sphere, 0.3175cm in diameter, which is submerged in a 25°C aqueous stream flowing at a bulk velocity of 0.15m/s. The mass diffusivity of glucose in water at 25°C equals 0.69*10⁻⁵cm²/s.
a). Estimate the mass transfer coefficient, k₁
33. easy student solutions manual a 5.00-kg ball, moving to the right at a velocity of 2.00 m/s on a frictionless table, collides head-on with a stationary 7.50-kg ball. find the final velocities of the balls if the collision is (a)elastic and (b)completely inelastic
Easy student solutions manual a 5.00-kg ball, moving to the right at a velocity of 2.00 m/s on a frictionless table, collides head-on with a stationary 7.50-kg ball. find the final velocities of the balls if the collision is
(a)elastic and (b)completely inelastic
An act or instance of colliding : conflict. : an encounter among particles (which includes atoms or molecules) resulting in alternate or transformation of strength. collisional.
Velocity (vɪˈlɒsɪtɪ) / noun plural -ties. pace of movement, action, or operation; rapidity; swiftness. physics a measure of the fee of movement of a frame expressed because the rate of exchange of its function in a specific route with time.
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A star can give off white light. Why is this evidence that a star is a blackbody radiator?.
Answer: This is evidence that a star is a blackbody radiator because white light is made up of many different wavelengths of light.
does the field [that is caused by a straight wire] have an axial component? does it have a radial component?
The field caused bt a straight wire have only axile component, B parallel Δl = μ₀I. The radial component of the field is perpenidular length.
A magnetic field is a vector subject that describes the magnetic effect on moving electric charges, electric currents, and magnetic materials. A transferring price in a magnetic area stories a pressure perpendicular to its very own pace and to the magnetic discipline.
A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric-powered currents, and magnetic substances. A transferring rate in a magnetic field story a pressure perpendicular to its own velocity and to the magnetic area.
The magnetic discipline is the place around a magnet wherein the impact of magnetism is felt. We use the magnetic discipline as a tool to explain how the magnetic force is shipped in the area around and inside something magnetic in nature.
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place), estimate the hydraulic conductivity [m/d] of the unconfined aquifer. the radius of influence around the pumping well is approximately 500 m
It is not possible for me to accurately estimate the hydraulic conductivity of an unconfined aquifer without additional information.
The hydraulic conductivity of an aquifer is a measure of its ability to transmit water, and it depends on various factors such as the porosity and permeability of the aquifer materials, the depth and thickness of the aquifer, the extent of the aquifer's saturation with water, and the hydraulic gradient within the aquifer.
The radius of influence around a pumping well is not necessarily related to the hydraulic conductivity of an aquifer.
In order to estimate the hydraulic conductivity of an unconfined aquifer, a hydrologist would need to conduct detailed field measurements and possibly use modeling techniques to take into account the various factors that affect the aquifer's ability to transmit water.
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fingerprints left on a piece of glass such as a windowpane can show colored spectra like that from a diffraction grating. why?
The skin oils from the finger will deposit on smooth surfaces in the pattern of the closely spaced ridges when the finger contacts them.
What is diffraction ?The Huygens-Fresnel principle, which views each point in a propagating wave front as a collection of unique spherical wavelets, describes the diffraction phenomenon in classical physics. When a wave from a coherent source (such a laser) comes into contact with a slit or aperture that is roughly the same size as its wavelength, the characteristic bending pattern is most noticeable.
There are numerous closely spaced ridges and swirls on the skin of a fingertip. The skin oils from the finger will deposit on smooth surfaces in the pattern of the closely spaced ridges when the finger contacts them. In order to create a crude diffraction grating and create a coloured spectrum of the light travelling through or reflecting from the glass surface, open intervals between the lines of deposited oil can be used as slits.
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evidence from distant supernovae (as well as from studies of the cosmic microwave background) seems to suggest that the universe is doing something that goes against what nearly all astronomers expected just a decade ago. what is this phenomenon, which is variously attributed to things called the cosmological constant, dark energy, or quintessence?
The first light to ever be capable of freely circling the entire universe is what is known as the Cosmic Microwave Background (CMB), and it has since been cooled.
What is Cosmic Microwave Background (CMB) radiation?In 1965, the CMB radiation was unintentionally discovered. Two radio astronomers from the United States, Penzias and Wilson, recorded a signal in their radio telescope that was impossible to attribute to a specific source in the sky. Day or night, summer or winter, it appeared to have the same intensity everywhere. They came to the conclusion that the signal had to originate from outside of our galaxy. It almost came from the beginning of the universe.Their discovery was viewed by scientists as strong support for the "Big Bang" theory. According to this theory, the 'shockwave' of that primordial explosion would still be observable as a subdued 'wallpaper' coming from everywhere behind all galaxies, quasars, and galaxy clusters. As of right now, the Big Bang theory is still the only theory that can satisfactorily account for the CMB's existence. This theory proposes that the Universe initially consisted of a very hot and dense phase that expanded and then naturally cooled; the temperature during this period was so high that neutral atoms could not form for several hundreds of thousands of years. Neutrons and charged particles were the primary components of matter. At that time, light and matter were tightly coupled because electrons and light particles interacted closely. The Universe was opaque as a result of the inability of light to propagate.To Learn more About Cosmic Microwave Background refer to:
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in electronic circuits, when analyzing the effect of l or c on the wave shape of non sinusoidal voltages, what is useful?
It retains its wave shape when added to another sine wave of the same frequency and arbitrary phase and magnitude.
What has a sinusoidal wave form?Periodic waveforms known as sine waves can be represented graphically using the sine or cosine trigonometric functions. Electrical circuits that receive "AC" voltages and currents, or sinusoidal waveforms whose polarity alternates on each cycle.The strength of the magnetic field that forms around a wire or conductor while an electric current flows through it is inversely proportional to the current value. The movement of this single wire conductor through the magnetic flux induces a "EMF" (Electromotive Force) inside the conductor if it is moved or rotated within a stationary magnetic field.It retains its wave shape when added to another sine wave of the same frequency and arbitrary phase and magnitude. It is the only periodic waveform that has this property. This property leads to its importance in Fourier analysis and makes it acoustically unique.To learn more about sinusoidal wave, refer to
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a friend of yours is loudly singing a single note at 500 hz while racing toward you at 27.2 m/s on a day when the speed of sound is 343 m/s. what frequency do you hear?
The frequency heard by you is 6305.15 Hz.
Given that,
f₁ = 500 Hz
v₁ = 27.2 m/s
f₂ = ?
v₂ = 343 m/s
If the frequency of a wave is directly proportional to the velocity.
We know that, f = kv
where, f is frequency
k is constant of proportionality
v is velocity
k = f/v
From the above formula, we can write, f₁ /v₁ = f₂ /v₂
We have to find out f₂, f₂ = f₁ *v₂ /v₁
Substituting the values, we have,
f₂ = 500* 343/ 27.2 = 6305.15 Hz
Thus, the frequency heard by you is 6305.15 Hz.
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two inductors of self-inductance l1 and l2 are connected in parallel. the inductors are magnetically shielded from one another so that neither produces flux in the other. show that the self-inductance of the combination is given by 1 l
Voltage is proportional to inductance just as, for resistors, it is proportional to resistance. Now, the (independent) voltages for parallel elements are equal (V₁ = V₂) and the currents (which are generally functions of time) add i(t) = i₁(t) + i₂(t)
This leads to the equation,
i = i₁ + i₂ + i₃ = V [(1/R₁) + (1/R₂) + (1/R₃)] for resistors.
We note that this condition on the currents implies
d₁(t)/dt + d₂(t)/dt = d(it)/dt
Thus, although the inductance equation, ε = -L(di/dt) involves the rate of change of current, as opposed to current itself, the conditions that led to the parallel resistor formula also apply to inductors.
Therefore, 1/L(eq) = 1/L₁ + 1/L₂
Therefore to ensure the independence of the voltage values, it is important that the inductors not be too close together. The requirement is that the field of one inductor not to have significant influence (or "coupling") in the next.
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In the photoelectric effect, a stopping potential of 3.2 V is needed for radiation of wavelength 200 nm.
(a)What is the work function (in eV) of the material?
(b) What is the maximum kinetic energy (in eV) of a photoelectron emitted from a surface whose work function is 5.0 eV when illuminated by a light whose wavelength is 200 nm?
(a) The work function is 7.5(10)¹⁴ Hz.
(b) The kinetic energy of photoelectron is - 1.898 eV
The photoelectric effect consists of the emission of electrons (electric current) that occurs when light falls on a metal surface under certain conditions.
If the light is a stream of photons and each of them has energy, this energy is able to pull an electron out of the crystalline lattice of the metal and communicate, in addition, a kinetic energy.
This is what Einstein proposed:
Light behaves like a stream of particles called photons with an energy
E = h.ν ----- eq1
So, the energy E of the incident photon must be equal to the sum of the Work function Φ of the metal and the kinetic energy K of the photoelectron:
E = Φ + K ----- eq2
Where Φ is the minimum amount of energy required to induce the photoemission of electrons from the surface of a metal, and its value depends on the surface.
In case, Φ = 5eV
So, applying equation (1) in this problem:
E = hν
Where:
h = 4.136(10)⁻¹⁵ eV is Planck constant
ν is the frequency
Now the frequency has an inverse relation with the wavelength
λ = 400(10)⁻⁹ m
ν = c/λ
Being c = 3(10)⁸ m/s is the speed of light in vacuum.
ν = 7.5(10)¹⁴ Hz.
Substituting,
E = 4.136(10)⁻¹⁵ {7.5(10)⁻¹⁰}
E = 3.1 eV
Now,
3.1 eV = 5 ev + K
K = - 1.898 eV
Since a negative kinetic energy is not physically possible, the only explanation is: the conditions for a photoelectric effect were not met, hence the photoelectric effect cannot occur.
Therefore, the main condition for the occurrence of the photoelectric effect is that the energy incident photon must be greater than the work function and E > Φ
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Sample response: t represents time, which is the input of the function, so we know that 10 is the time in minutes. H(t) represents the altitude, which is the output of the function after time, t. So, we need to substitute 10 into 210 – 15t in place of t. Simplifying 210 – 15(10), we get that 60 is the altitude in feet. So, after 10 minutes, the hot air balloon is at 60 feet. What did you include in your response? check all that apply. T represents time, which is the input of the function. H(t) represents the altitude, which is the output of the function. After 10 minutes, the hot air balloon is at 60 feet
Answer: Uh i do not know
Explanation:
the mass of the puck is difficult to measure because it sublimates and looses mass over time. can this explain the difference between the spring constants you found in part 1 and part 2? give your answer as a cer.
The spring stiffness is quantified by the spring constant, or k. For various springs and materials, it varies. The stiffer the spring is and the harder it is to stretch, the larger the spring constant.
F = -kx. The term "spring constant" refers to the proportional constant k. It gauges the stiffness of the spring. A spring exerts a force F = -kx in the direction of its equilibrium position when it is stretched or compressed to a length that differs by an amount x from its equilibrium length. A large value of k indicates that more force is needed to stretch it a given distance than would be necessary to stretch a less stiff spring the same distance.
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You redo the primitive yo yo experiment (Figure 1), but instead of holding the free end of the string stationary, you move your hand vertically so that the tension in the string equals 2M /3. What is the vertical acceleration of the yo yo's cena of mass? Does it accelerate upward or downward? Express your answer to three significant figures and include the appropriate units. Enter positive value of the acceleration is directed upward and negative value if the acceleration is directed downward.
The direction of acceleration is downward, and its magnitude is 3.27 m/s².
Given:
Tension, T = 2M/3
The gravitational force is exerted downwards, and the tension force is exerted in the opposite direction of the gravitational force.
The total force is given by:
mg - T = ma
The torque is given as:
T × R = MR²/2 × α
Here, α is centripetal acceleration;
The centripetal acceleration is given by:
α = a/R
Substitute values:
MG - 2mG/3 = ma
a = g/3
The direction of acceleration is downward.
a = 9.8/3
a = 3.27 m/s²
Hence, the direction of acceleration is downward, and its magnitude is 3.27 m/s².
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A block of mass m lying on a rough horizontal surface is given an initial velocity of v0. After traveling a distance d, it makes a head-on elastic collision with a block of mass 2m. How far does the second block move before coming to rest? (Assume the coefficient of friction, µk, is the same for both blocks.)
Hence the block will travel for 8 cm before coming to rest.
An elastic collision is a collision in which there may be no net loss in kinetic energy inside the device because of the collision. both momentum and kinetic strength are conserved portions in elastic collisions.
In physics, an elastic collision is an come across between two bodies wherein the full kinetic strength of the two bodies stays equal. In a really perfect, flawlessly elastic collision, there's no net conversion of kinetic electricity into other forms together with warmth, noise, or potential electricity.
Whilst a ball at a billiard desk hits another ball, it's miles an example of elastic collision. while you throw a ball at the floor and it bounces again in your hand, there may be no internet change in the kinetic energy, and subsequently, it's far an elastic collision.
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which of the following is likely to break a wave? a) the wind increases its speed near shorelines b) random molecular motion in wave forms c) the bottom interferes with its oscillatory motion d) the sediment load of water is greater near the shore e) the density of water increases closer to shore
The wave can be broken in c) the bottom interfering with its oscillatory motion.
In fluid mechanics, a breaking wave or breaker is a wave whose amplitude reaches a critical level where a large amount of wave energy is converted into turbulent kinetic energy. At this point, simple physical models describing wave dynamics, especially those that assume linear behavior, are often invalid.
The most commonly known type of breaking wave is a water wave that breaks on the shore. In general, wave breaking occurs when the amplitude reaches the point where the crest of the wave actually flips over. Another particular effect in fluid dynamics is also called "wave breaking", partly by an analogy to waves on water. In meteorology, atmospheric gravitational waves are said to break down when the wave creates a region of potential temperature drop with altitude, resulting in energy dissipation due to convective instability.
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multiple-concept example 7 explores the approach taken in problems such as this one. the blades of a ceiling fan have a radius of 0.380 mm and are rotating about a fixed axis with an angular velocity of 1.50rad/s 1.50rad/s . when the switch on the fan is turned to a higher speed, the blades acquire an angular acceleration of 2.00rad/s2 2.00rad/s2 . after 0.500 ss the blades acquire an angular acceleration of 2.00rad/s2 2.00rad/s2 . after 0.500 ss has clapsed since the switch was resct, what is (a) the total acceleration (in m/s2)m/s2) of a point on the tip of a blade and (b)(b) the angle ϕϕ between the total acceleration a→a→ and the centripetal acceleratio
The angle of total acceleration with centripetal acceleration is 13.14 degree.
What is acceleration?
The rate at which an object's velocity with regard to time changes is referred to as acceleration in mechanics. It is a vector quantity to accelerate. The direction of an object's acceleration is determined by the net force that is acting on it. the quantity of acceleration a body undergoes in accordance with Newton's Second Law. For instance, when a vehicle moves from the a standstill (nil velocity, inside of an inertial frame of reference to the a straight line at increasing speeds, it accelerates inside the direction of travel.
Here ,
radius , r = 0.380 m
angular velocity , w = 1.50 rad/s
angular acceleration ,alpha = 2 rad/s^2
after the time 0.5 s
for the final angular velocity
wf = wi + alpha * t
wf = 1.50 + 2 * 1
wf = 2.5 rad/s
Centripetal Acceleration: wf2 * r
ac = 2.5^2 * 0.380 m/s^2
ac = 2.375 m/s^2
for tangential acceleration
at = alpha * r
at = 1.5 * 0.380
at = 0.57 m/s^2
a) for the total acceleration = sqrt(at^2 + ac^2)
total acceleration = sqrt(2.375^2 + 0.57^2)
total acceleration = 2.44 m/s^2
b)
angle =arctan(at/acceleration)
angle = arctan(0.57/2.44)
angle = 13.14 degree
The angle of total acceleration with centripetal acceleration is 13.14 degree
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The recommended weight of a soccer ball is 430 grams. The actual weight is allowed to vary by up to 20 grams.
The absolute value equation is |x - 430| ≤ 20.
What is equation?An equation is a formula that is express the equality of two equation.
b) Solution: 410 ≤ x ≤ 450
Explanation:
1) Call x the variable, actual weight of the soccer ball
2) Recomended weight: 430 g
3) Difference using absolute value is | x - 430|
4) The accepeted variation (difference) is up to 20 g means that the difference has to less than or equal to 20 g ⇒ | x - 430| ≤ 20
5) Solution:
i) start: |x - 430| ≤ 20
ii) as per the definition of absolute value: -20 ≤ x - 430 ≤ 20
iii) addition property of inequalities: add 430 to all the parts:
- 20 + 430 ≤ x - 430 + 430 ≤ 20 + 430
iv) do the operations: 410 ≤ x ≤ 450
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Two identical cars, one on the moon and one on earth, are rounding banked curves at the same speed with the same radius and different angles. The acceleration due to gravity on the moon is 1/6 that of earth. How do the centripetal accelerations of each car compare?.
The acceleration due to gravity on the moon is 1/6 that of earth, then the centripetal forces are the same for each car.
What is centripetal force?A force that keeps objects moving in a circular path is called centripetal force .
The centripetal force on an object is given by :
F= mv²/R
where,
F is centripetal force,
m is mass of the object,
and v is speed,
r is radius of the circular path.
Centripetal force primarily depends upon three factors, that are, mass of object, speed and radius of the circular path.
The speed of cars and the radii of the circular paths are given to be same. Hence, the centripetal force acting on both cars must also be same.
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what frequency of rotation, in rpm , is required to give an acceleration of 1.4 g to an astronaut's feet, if her feet are 1.1 m from the platform's rotational axis?
The frequency of the rotation having a radius of 1.1 m is 3.53 rpm
The rotational acceleration = 1.4 g
The radius of the rotation = 1.1 m
The frequency of the rotation can be found using the formula,
ω = √(α/r)
where ω is the frequency of the rotation
α is the acceleration of the rotation
r is the radius of the rotation
Let us substitute the known values in the above equation, we get
ω = √ (1.4 x 9.8 / 1.1 )
= √ (13.72 / 1.1)
= √12.47
ω = 3.53
Therefore the frequency of the rotation is 3.53 rpm
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compared with the buoyant force of the atmosphere on a 1 liter helium filled balloon the buoyant force of the atmosphere on a nearby 1 liter solid iron block is the same. how do you explain this
The density of fluid which means air is the same for both cases, but the volume of a 1 kg helium balloon is more than the density of iron, so the buoyant force on helium is the same as the buoyant force on iron.
What is Buoyant Force?
The buoyant force is the upward push that a fluid applies to an object when it is submerged in it. The fluid's pressure on the object is what creates the buoyant force. The net upward force results from the fact that the pressure on the bottom of an item is always greater than the force on the top since pressure rises as depth increases.
What is Density?
Mass of a solid substance per unit volume.
d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimetre are a typical unit of measurement for density.
Hence, it can be concluded from this that, the buoyant force on both is the same.
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dentical rays of light in air are refracted upon entering three transparent materials: (a) water, where the speed of light is 0.75c ; (b) ethyl alcohol; speed 0.7c ; and (c) crown glass; speed 0.6c .
The transition from less dense air to denser glass or water causes light to slow down.
What happens to a ray of light as it passes through air and enters water?A beam of light (a collection of perpendicular rays) will move straight through the air when it is shone at it. Until they come into contact with an object, light rays typically go in straight paths.A sheet of glass's surface will reflect some light when a light ray strikes it, so this happens. However, because glass is transparent, a large portion of the light will flow through the glass.Light beams are similarly impacted by water. While some light will reflect off the water's surface, the translucent water will let in the majority of the light.The direction of a light ray changes when it travels through glass from the atmosphere. As it travels through the glass' surface, the light ray seems to bend.Similar effects occur when a light beam travels from air into water: the light ray is twisted as it collides with the water's surface.Refraction describes the "bending of a ray of light" when it travels through one substance and then another.When a light beam exits glass or water and enters the atmosphere, it will also bend.To Learn more About slow down refer to:
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four resistors of 3.40 ohms, 6.54 ohms, 8.32 ohms, and 1.34 ohms are connected in parallel with a 12.0 v battery. find the total resistance, in ohms, of the circuit.
The circuit's overall resistance, measured in ohms, is 9.23A. when a 12.0 v battery is linked in parallel with four resistors that have resistance values of 3.40 ohms, 6.54 ohms, 8.32 ohms, and 1.34 ohms.
How can we determine the circuit's overall resistance?You add up the individual resistances to determine the total overall resistance of several resistors connected in this manner. The formula used for this is as follows: Rtotal = R1 + R2 + R3, and so forth. Example: For these three resistors connected in series, determine the total resistance.
How much resistance is there in total?The sum of each component resistance in a series circuit represents the circuit's overall resistance.
1 / Req = 1 /R1 + 1 / R2 + 1 / R3 + 1 / R4Req = 1.3ohms
Current = V / R
I = 9.23A
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