A laser used for surgery directs most of the light only toward the patient. But suppose that a small fraction of the light, 4.54 watts, leaks out and travels equally in all directions. A surgeon without protection should stay away from this laser at least: 9.05 meters.
The exposure to laser radiation poses potential hazards, including injury to the skin, eyes, or other parts of the body. The distance between the source of the laser radiation and the surgeon depends on the intensity of laser radiation, and the duration of the exposure.
The intensity of the laser beam is the power of the beam divided by the surface area perpendicular to the direction of the beam. The laser radiation to which a person is exposed is determined by the distance between the source and the person, as well as the degree of divergence of the beam.
As the distance between the person and the source increases, the amount of radiation decreases. Therefore, the intensity of radiation is inversely proportional to the square of the distance. Using the equation, Power = Intensity × Surface area, we can calculate the surface area.
We know that the power of the leaked laser light is 4.54 watts and the safe intensity of laser light is 0.0204 watts per meter squared. Therefore, the surface area is
Surface area = power/intensity
= 4.54/0.0204=222.549 meters squared.
The distance between the surgeon and the laser light can be calculated by using the formula
Surface area of a sphere = 4πr²
Where r is the radius of the sphere.
As the laser light travels equally in all directions, the surface area of the sphere is given as
Surface area of a sphere = 4πr²= 222.549 meters squared. We can find the radius r by dividing the surface area of the sphere by 4π. Therefore, [tex]r^{2} = 222.549/4\pi r^{2}= 17.747r = \sqrt{17.747r} = 4.212 meters[/tex]
The surgeon without protection should stay at least 4.212 meters away from laser in meters.
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a 47.0 kg stunt pilot who has been diving her airplane vertically pulls out of the dive by changing her course to a circle in a vertical plane.if the plane's speed at the lowest point of the circle is 96.0 m/s , what is the minimum radius of the circle so that the acceleration at this point will not exceed 4.00 g ?what is the apparent weight of the pilot at the lowest point of the pullout?
The minimum radius of the circle so that the acceleration at this point will not exceed 4.00 is 2304 m, and the apparent weight of the pilot at the lowest point of the pullout is 272.6 N.
The equation for centripetal acceleration is:
a = (v²)/r, where a is the centripetal acceleration, v is the velocity, and r is the radius of the circle.
The equation can be rearranged to solve for the radius of the circle,
r = (v²)/a.
Plugging in the given values, we get:
r = (96)² / 4.00g
r = 2304 m.
The equation for the apparent weight of the pilot is
[tex]w_{app}[/tex] = mg - m* [tex]a_{centripetal}[/tex], where [tex]w_{app}[/tex] is the apparent weight, m is the mass of the pilot, g is the acceleration due to gravity, and [tex]a_{centripetal}[/tex] is the centripetal acceleration.
Plugging in the given values, we get [tex]w_{app}[/tex] = (47.0)(9.8) - (47.0)(4) = 272.6 N.
Therefore, the minimum radius of the circle is 2304 m, and the apparent weight of the pilot is 272.6 N.
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balance the chemical equation
N₂ + 02 → - N₂0
The balanced form of the given chemical equation is as follows: 2N₂ + 0₂ → 2N₂0.
What is a balanced chemical equation?A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.
A chemical equation results in the formation of new substances called products from substances called reactants.
However, to obey the law of conservation of mass, the atoms of each element on both sides of the equation must be the same. This is referred to as a balanced chemical equation.
The balanced form of the reaction between nitrogen and oxygen gas is given above.
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2 Part question
Part 1. A 3.63 kg cat is sleeping on a couch which is 0.5 meters above the floor. Find the potential energy of the cat.
Part 2. While sleeping on the couch the cat (see problem 3 above) has a dream of being chased by the dog that lives in the apartment above the cat and as a result, falls to the floor (which takes 2 seconds) Find the kinetic energy of the cat.
The potential energy of the cat is 17.76 joules.
The kinetic energy of the cat just before hitting the ground is 84.59 joules.
How to solve for the potential energyPart 1:
The potential energy of the cat can be found using the formula:
potential energy = mass x gravity x height
where the mass of the cat is 3.63 kg, gravity is 9.81 m/s², and height is 0.5 meters.
Substituting these values in the formula, we get:
potential energy = 3.63 kg x 9.81 m/s² x 0.5 m
potential energy = 17.76 joules
Therefore, the potential energy of the cat is 17.76 joules.
Part 2:
The kinetic energy of the cat just before hitting the ground can be found using the formula:
kinetic energy = 0.5 x mass x velocity²
To find the velocity of the cat just before hitting the ground, we can use the equation of motion:
height = (1/2) x acceleration x time² + initial velocity x time
where height is 0.5 meters, acceleration is gravity (9.81 m/s²), time is 2 seconds, and initial velocity is 0 m/s (since the cat starts from rest).
Rearranging this equation to solve for velocity, we get:
velocity = (height - (1/2) x acceleration x time²) / time
velocity = (0.5 - (1/2) x 9.81 x 2²) / 2
velocity = -4.905 m/s (the negative sign indicates that the velocity is downward)
Substituting the mass of the cat (3.63 kg) and the velocity (-4.905 m/s) in the formula for kinetic energy, we get:
kinetic energy = 0.5 x 3.63 kg x (-4.905 m/s)²
kinetic energy = 84.59 joules
Therefore, the kinetic energy of the cat just before hitting the ground is 84.59 joules.
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See Figure 1. What was the average yearly ice loss in 1980 versus 2010?
Between 1980 and 2010, there were significant differences in the average annual ice loss of glacial mass balance between different glaciers and geographical areas. This suggests that ice loss has risen since the 1980s.
What was the glacier mass balance's average annual ice loss between 1980 and 2010?The average annual mass balance of reference glaciers globally between 1980 and 1999 was -0.50 m water equivalent (w.e.) per year, while between 2000 and 2017 it was -0.69 m w.e. per year, according to the World Glacier Monitoring Service. This shows a pattern of higher ice loss compared to the 1980s and 1990s in recent years. It's crucial to remember that this figure represents an average across a significant number of glaciers.
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Calculate how far a ball would be hit if it was hit at an angle of 25° and a velocity of 80 mph.
The ball would be hit if it was hit at an angle of 25° and a velocity of 80 mph, it will travel 1-8m.
What is velοcity ?The definitiοn οf velοcity is the rate at which a bοdy mοves in a particular directiοn. Velοcity is the rate at which a distance changes in relatiοn tο time. A vectοr quantity with bοth magnitude and directiοn is velοcity.
What is mass ?The amοunt οf matter in a bοdy is referred tο as its mass. The kilοgramme is the kilοgrams, which is the SI unit οf mass (kg). Mass is defined as: Mass = Density/Vοlume.
Therefοre, ball wοuld be hit if it was hit at an angle οf 25° and a velοcity οf 80 mph, it will travel 1-8m.
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you are driving your car around a roundabout when you get a flat tire and you decelerate at a constant rate to a stop. the diameter of the roundabout is 70 m m . it takes you 32 s s to come to a complete stop. while slowing down, you continue to drive in a circle and you stop at the same spot that you popped your tire. what must have been your speed before the pop?
Speed before the tire popped must have been 35.8 m/s. To calculate your speed before the tire popped, we will use the equation vf = vi + at. In this equation, vf is the final velocity (0 m/s), vi is the initial velocity, a is the acceleration (deceleration in this case), and t is the time.
Since we know the diameter of the roundabout, the time it took to stop, and the acceleration is constant, we can calculate the initial velocity as:
vi = vf + at
vi = 0 m/s + (-1.125 m/s2) * 32 s
vi = -35.8 m/s
So, your speed before the tire popped must have been 35.8 m/s.
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Why must the negative terminals of the batteries be connected on the same side of the parallel circuit and positive terminals on the other side
The negative terminals of batteries must be connected on the same side of a parallel circuit and positive terminals on the other side to ensure that the voltage across each branch of the circuit is the same and that the batteries share the load equally.
In a parallel circuit, each branch of the circuit provides a separate path for current to flow, and the voltage across each branch is the same. Connecting the negative terminals of the batteries on the same side and the positive terminals on the other side ensures that the voltage across each branch remains the same, as the voltage drop across each battery is identical.
If the batteries were connected with opposite polarity, the voltage across each branch would be different, and the battery with the higher voltage would take on a larger share of the load, leading to unequal discharge and potentially damaging the batteries. It is essential to connect the negative terminals of the batteries on the same side and the positive terminals on the other side to ensure that each battery shares the load equally.
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If ocean water did not move it would be hot in the _ region and frigid in the _ region
If ocean water did not move, it would be hot in the equatorial region and frigid in the polar regions.
Ocean currents are responsible for redistributing heat around the planet. Without these currents, the equatorial region would receive more sunlight and heat than it loses, resulting in an accumulation of heat in the water. On the other hand, the polar regions would lose more heat than they receive, resulting in frigid temperatures.
The rotation of the Earth also influences the movement of ocean water through the Coriolis effect. Without this effect, ocean currents would be less predictable, and their impact on climate and temperature distribution would be more severe. Therefore, ocean currents play a crucial role in regulating Earth's climate, and their disruption could have significant consequences for both marine life and global weather patterns.
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Help me pleaseeeeeeee
Discovery Statement:
I discovered that my note-taking skills needed improvement when I attended a lecture by a guest speaker who spoke very quickly and used complex technical terms that were unfamiliar to me. I found it challenging to keep up with the speaker's pace and understand the content at the same time. As a result, I struggled to take accurate and organized notes, and ended up with a confusing and incomplete set of notes. When I reviewed my notes later, I realized that I had missed important points and failed to capture the essence of the lecture. This experience made me realize that I need to improve my note-taking skills, especially in situations where the content is complex and the speaker is fast-paced.
What is the Discovery Statement about?My intention is to implement the following five note-taking strategies immediately to improve my skills:
Cornell Method - Divide notes into main ideas, supporting details, and summary. (Article: "Note-Taking Methods")Mind Maps - Use diagrams to visualize connections between ideas. (Article: "Visual Note-Taking")Abbreviations - Create a system of abbreviations to save time while taking notes. (Article: "Note-Taking Strategies for College Students")Active Listening - Stay engaged with the speaker and ask questions to clarify information. (Article: "How to Take Better Notes in Class")Review and Revise - Review notes regularly and make revisions to improve understanding. (Article: "Effective Note-Taking Techniques")Learn more about Discovery Statement on:
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See transcribed text below
MINDTAP
try: Transform Your Note-Taking
ms Journal Entry Transform your note taking
3
Q Search this course
0
Q
Question 1 of 1
Think back on the last few lectures you have attended. How would you rate your note-taking skills? As you complete this exercise, think of areas that need improvement.
1. Discovery Statement
First, recall a recent incident in which you had difficulty taking notes. Perhaps you were listening to an instructor who talked fast. Maybe you got confused and stopped taking notes altogether. Or perhaps you went to review your notes after class, only to find that they made no sense at all. Describe this incident in more detail, noting how it was challenging for you.
I discovered that...
X
2. Intention Statement
Now review this chapter to find at least five strategies that you can use right away to help you take better notes. In the space below, sum up each of those strategies in a few words, and note the title of the article where these strategies are explained.
2 Action Statement
Q Search
LM
A-Z
b
بین
9:19 PM
3/3/2023
A block with a mass of 2 kg sitting at rest on ice is pulled by a rope. The block achieves a velocity of 3
m/s, 4 seconds later, at a point 6 meters to the right of its starting point. If the blockís acceleration
was constant and the friction between the ice and block is negligible, which of the following is the
amount of work done by the force of the rope as it pulled the block through the first 6 meters?
O 117.6 J
36 J
9J
12 J
The amount of work done by the force of the rope as it pulled the block through the 6 meters is 9J.
The kinetic energy of the block is given by the formula
K = [tex]\frac{1}{2}[/tex]m[tex]v^{2}[/tex]
where,
m = mass of the block
v = velocity
Initially, the block is at rest. After being pulled by rope for 4 seconds it has an initial velocity of 3 m/s. Therefore, its final initial velocity is
Kf = [tex]\frac{1}{2}[/tex](2 kg)[tex](3 m/s) ^{2}[/tex]= 9 J
change in kinetic energy
ΔK = Kf - Ki = 9 J - 0 J = 9 J
Therefore, The amount of work done by the force of the rope as it pulled the block through the 6 meters is 9J.
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can one entangled particle be measured for momentum while the other entangled particle is measured for position?
According to the principles of quantum mechanics, the answer to the question, "Can one entangled particle be measured for momentum while the other entangled particle is measured for the position?" is no.
If you measure the position of one particle in an entangled pair, you are creating a definite outcome for that particle. By measuring the other particle's momentum, you are causing it to have a definite outcome. That, however, is incompatible with the fact that the two particles are entangled. Their correlation will be broken if this is done.
The position and momentum measurements are incompatible in quantum mechanics. If you want to measure the position of a particle, the uncertainty in the momentum of the particle must be large. Conversely, if you want to measure the momentum of a particle, the uncertainty in the position of the particle must be large.
Furthermore, measuring the position of a particle has a detrimental effect on the uncertainty in its momentum. Similarly, measuring the momentum of a particle has a detrimental effect on the uncertainty in its position. The measurement outcomes of two entangled particles are determined by correlations between them.
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If the the dolphin produces sound waves of wavelength of 5 cm determine by the means of calculations whether the frequency produced by dolphin can be heard by human ear the speed of sound is water is 1480 m. S-1
If the the dolphin produces sound waves of wavelength of 5 cm determine by the means of calculations whether the frequency produced by dolphin can be heard by human ear the speed of sound is water is 1480 m. S-1
To determine whether the frequency produced by the dolphin can be heard by the human ear, we can use the formula:
v = f x λ
where v is the velocity of sound in water, f is the frequency of the sound wave, and λ is the wavelength of the sound wave.
Given v = 1480 m/s, λ = 5 cm = 0.05 m, we can rearrange the formula to solve for f:
f = v / λ
Plugging in the values, we get:
f = 1480 m/s / 0.05 m
f = 29600 Hz
Therefore, the frequency produced by the dolphin is 29600 Hz.
The human ear can typically hear frequencies ranging from 20 Hz to 20,000 Hz, with some variation among individuals. Therefore, the frequency produced by the dolphin is well beyond the range of human hearing.
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Consider a collar of mass m sliding on a frictionless shaft, as depicted in figure[4]. The collar can slide along the shaft and is connected to a spring of spring constant k, the other end of which is connected to the pivot point o a distance l from the shaft. The unstretched length of the spring is l. (a) how many degrees of freedom are there in this problem? describe the constraints, though you do not have to use formal equations. (b) find the equation of motion for the collar. (c) find an expression for the normal force vector between the collar and shaft as a function of x
(a) There is only one degree of freedom in this problem since the collar can move along the shaft but cannot rotate. The constraints are that the distance between the collar and the pivot point is always equal to l, and the collar cannot move perpendicular to the shaft.
(b) The forces acting on the collar are the spring force and the gravitational force. Since the collar is sliding along a frictionless shaft, there is no frictional force. The equation of motion for the collar is given by:
m(d²x/dt²) = -k(x-l) - mg
where x is the displacement of the collar from its equilibrium position.
(c) The normal force between the collar and the shaft is perpendicular to the shaft and balances the component of the gravitational force that is perpendicular to the shaft. As the collar moves away from its equilibrium position, the spring force becomes unbalanced and the normal force changes accordingly. The normal force is given by:
N = mgcos(θ) + k(x-l)sin(θ)
where theta is the angle between the shaft and the vertical axis.
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a student applies a horizontal force of 20.0 n to the top of a steering wheel. the steering wheel has a radius of 18 cm and a rotational inertia of 0.097 kgm2 . assuming the friction and any opposing torques are negligible, what is the initial angular acceleration of the steering wheel?
The initial angular acceleration of the steering wheel is 3.67 rad by s2.
The initial angular acceleration of the steering wheel can be calculated using the formula alpha = (F * R) by I, where F is the applied force, R is the radius of the wheel, and I is the rotational inertia.
In this case, F = 20.0 N, R = 0.18 m, and I = 0.097 kgm2. Substituting these values into the formula gives:
alpha = (20.0 N * 0.18 m) by 0.097 kgm2 = 3.67 rad by s2
Therefore, the initial angular acceleration of the steering wheel is 3.67 rad by s2.
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How long would it take for 300 C of electric charge to pass through an aluminum wire if the current through it is 0. 6
500 seconds (or 8 minutes and 20 seconds) for 300 C of electric charge to pass through an aluminum wire if the current through it is 0.6 A.
To answer this question, we need to use the formula:
Q = I × t
where:
Q is the electric charge in Coulombs (C)
I is the current in Amperes (A)
t is the time in seconds (s)
We can rearrange this formula to solve for t:
t = Q / I
Substituting the given values, we get:
t = 300 C / 0.6 A
t = 500 seconds
Therefore, it would take 500 seconds (or 8 minutes and 20 seconds) for 300 C of electric charge to pass through an aluminum wire if the current through it is 0.6 A.
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An organism that breaks down dead plants and animals, returning matter back into the soil, is called a
A.
herbivore.
B.
producer.
C.
competitor.
D.
decomposer.
Answer:
d. decomposer
Explanation:
they play a critical role in the flow of energythrough an ecosystem. They break apart dead organisms into simpler inorganic materials, making nutrients available to primary producers
A bullet with a mass of 7.91 g and a speed of 352 m/s penetrates a tree horizontally to a depth of 4.86 cm. What is the frictional force?
The frictional force acting on the bullet is 16.08 N. The force produced when two surfaces slide past one another and make contact is known as frictional force.
How does frictional force work?Friction is a force that prevents two solid objects from rolling or sliding over one another. Although frictional forces, such as the traction required to walk without slipping, may be advantageous, they can provide a significant amount of resistance to motion.
we need to use the equation for work done by friction.
The work done by friction is:
W = F_friction * d
F_friction = W / d
where F_friction is the frictional force.
To find the work done by friction, we need to use the kinetic energy equation:
KE = 1/2 * m * v^2
where KE = kinetic energy of the bullet, m = mass of the bullet, and v = velocity of the bullet.
W = KE
Substituting the values,
KE = 1/2 * m * v^2
KE = 1/2 * 0.00791 kg * (352 m/s)^2
KE = 0.782 J
So, the work done by friction is 0.782 J.
Now, we can use the given depth of penetration to find the distance over which the frictional force acts:
d = 0.0486 m
we can use the equation for the frictional force,
F_friction = W / d
F_friction = 0.782 J / 0.0486 m
F_friction = 16.08 N
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Forces of 7.6N at 38 degrees and 11.8N at 143 degrees act at a point.Calculate the magnitude and direction of their resultant.
Answer:
Approximately [tex]12.3\; {\rm N}[/tex] at approximately [tex]106^{\circ}[/tex].
Explanation:
Assume the two given directions are measured with respect to the positive [tex]x[/tex] axis.
If a vector of magnitude [tex]\| a\|[/tex] is at an angle of [tex]\theta[/tex] from the positive [tex]x[/tex] axis, this vector can be written in the component form as:
[tex]\begin{aligned}\| a\|\begin{bmatrix}\cos(\theta) \\ \sin(\theta)\end{bmatrix}\end{aligned}[/tex];
Or equivalently:
[tex]\begin{aligned}\begin{bmatrix}\|a\|\, \cos(\theta) \\ \|a\|\, \sin(\theta)\end{bmatrix}\end{aligned}[/tex].
For example, the [tex]7.6\; {\rm N}[/tex] force is a vector with magnitude [tex]7.6\; {\rm N}[/tex] at a direction of [tex]38^{\circ}[/tex] from the positive [tex]x[/tex] axis. This vector can be represented as:
[tex]\begin{aligned} 7.6\, \begin{bmatrix}\cos(38^{\circ}) \\ \sin(38^{\circ})\end{bmatrix} &= \begin{bmatrix}7.6\, \cos(38^{\circ}) \\ 7.6\, \sin(38^{\circ})\end{bmatrix} \approx \begin{bmatrix}5.9889 \\ 4.6790 \end{bmatrix}\end{aligned}[/tex].
Similarly, the [tex]11.8\; {\rm N}[/tex] vector can be represented as:
[tex]\begin{aligned}11.8\, \begin{bmatrix}\cos(143^{\circ}) \\ \sin(143^{\circ})\end{bmatrix} &= \begin{bmatrix}11.8\, \cos(143^{\circ}) \\ 11.8\, \sin(143^{\circ})\end{bmatrix} \approx \begin{bmatrix}-9.4239 \\ 7.1014 \end{bmatrix}\end{aligned}[/tex].
To find the sum of the two vectors, take the sum of each component separately:
[tex]\begin{aligned}& \begin{bmatrix}5.9889 \\ 4.6790 \end{bmatrix} + \begin{bmatrix}-9.4239 \\ 7.1014\end{bmatrix} \\ =\; & \begin{bmatrix}5.9889 + (-9.4239)\\ 4.6790 + 7.1014\end{bmatrix} \\ \approx\; & \begin{bmatrix}-3.4350 \\ 11.780\end{bmatrix} \end{aligned}[/tex].
Apply the Pythagorean Theorem to find the magnitude of this vector sum:
[tex]\displaystyle \sqrt{(-3.4350)^{2} + (11.780)^{2}} \approx 12.271[/tex].
Note that the first component ([tex]x[/tex]-component) of this vector is negative, such that this vector would point to the left of the vertical axis. Since the second component ([tex]y[/tex]-component) of this vector is positive, this vector would point above the horizontal axis. Hence, the direction of this vector (relative to the positive [tex]x\![/tex]-axis) would be an angle between [tex]90^{\circ}[/tex] and [tex]180^{\circ}[/tex].
Divide the [tex]x[/tex]-component of this vector by its magnitude to find the cosine of the angle between this vector and the positive [tex]x\![/tex]-axis. Apply the inverse cosine function to find this angle:
[tex]\begin{aligned}\arccos \left(\frac{-3.4350}{12.271}\right) \approx 106^{\circ}\end{aligned}[/tex].
The question is attached
Answer:
The answer is B.
Explanation:
It is clear that the substance will be in liquid state above its melting point and below its boiling point.
A) This is incorrect. The substance is above the melting point but it is also above the boiling point (0 is greater than -183)
B) This is your correct answer. The substance is above the melting point and also below the boiling point.
C) This is incorrect. The substance is below both the melting point and the boiling point.
D) This is incorrect. The substance is drastically below the melting and boiling point.
Therefore , the only correct answer for this question would be B.
assume you have two objects of the same mass m and radius r. one object is a thin hoop, and the other object is a solid cylinder. which object has a larger moment of inertia i?
For two objects of the same mass and radius, the one with more mass concentrated farther away from the axis of rotation will have a larger moment of inertia. Therefore, the moment of inertia of a solid cylinder is greater than that of a thin hoop of the same mass and radius.
The moment of inertia of a thin hoop of mass m and radius r is given by:
I_{hoop} = mr²
The moment of inertia of a solid cylinder of mass m and radius r is given by:
I_{cylinder} = (1/2)mr²
From these equations, the moment of inertia of a solid cylinder is greater than that of a thin hoop of the same mass and radius.
Therefore, a solid cylinder has a larger moment of inertia compared to a thin hoop.
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what is work in physics
Rank the capacitors on the basis of the charge stored on the positive plate. Rank from largest to smallest: To rank items as equivalent; overlap them: A) A = 4 cm ; C=8nF B) A = 2 cm? =8 nFC) A = 2 cm? =4 nF D) A = 4 cm? C = 2 nF E) A =1 cm? = 1ln F
According to the charge that is stored on the positive plate, the order is B, A, C, D, and E, from biggest to smallest.
The charge stored on the positive plate of a capacitor is given by Q = CV, where Q is the charge, C is the capacitance, and V is the voltage. Since the capacitors are connected in parallel, they all have the same voltage V. Therefore, the capacitor with the largest capacitance will have the largest charge stored on its positive plate.
Ranking the capacitors from largest to smallest based on their capacitances, we get:
B) A = 2 cm, C = 8 nF
A) A = 4 cm, C = 8 nF
C) A = 2 cm, C = 4 nF
D) A = 4 cm, C = 2 nF
E) A = 1 cm, C = 1 nF
Therefore, the ranking from largest to smallest based on the charge stored on the positive plate is: B, A, C, D, E.
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An object is moving to the right, and experiencing a net force that is directed to the right. The magnitude of the force is decreasing with time. The speed of the object is:A. increasingB. constant in timeC. decreasing
Answer:
The speed of the object is increasing.
F = M a as long as the magnitude of the acceleration is acting towards the right there will be an acceleration towards the right
A U-Shaped tube of constant cross-sectional area contains water of density 1000kg/m cubed. Bothe side of the tube are open to the atmosphere. The atmospheric pressure is 1. 00 x 10 to the power of 5. The left hand side is now connected to a gas supply using a length of rubber tubing. This causes the level of the water in the left hand side to drop by 0. 200m. Calculate the pressure of the gas supply. Give your answer to 3 significant figures
Answer:
If the water in the left side drops .2 m then the water on the right side rises by .2 m
The pressure on the gas is due to the height difference of the water on the two sides.
P = ρ g h
ρ g = 9.8 m/s^2 * 1000 kg / m^3 = 9800 N/m^3 weight density of water
P = 9800 N/m^3 * .4 m = 3920 N / m^2 = 3.92E3 N/m^2
Absolute pressure of gas = 3.92E3 / 1.01E5 = .0388 atmosphere
An electron is accelerated through a potential difference V. Write the expression for its
final speed, if it was initially at rest
The final speed of an electron accelerated through a potential difference V, starting from rest, is given by the expression [tex]v = 5.93 \times 10^7 \times \sqrt{V}[/tex], where v is in meters per second and V is in volts.
The kinetic energy gained by an electron accelerated through a potential difference V is given by:
K = eV
Where:
K is the kinetic energy gained by the electron (joules)
e is the charge of the electron ([tex]1.6 \times 10^{-19}[/tex]coulombs)
V is the potential difference across which the electron is accelerated (volts)
Since the electron was initially at rest, its initial kinetic energy was zero. Therefore, the final kinetic energy of the electron will be equal to the kinetic energy gained during acceleration:
K = eV
The final velocity of the electron can be calculated using the formula for kinetic energy:
K = (1/2)m[tex]v^2[/tex]
Where:
m is the mass of the electron[tex](9.11 \times 10^{-31} kg)[/tex]
v is the final velocity of the electron
Substituting the expression for K, we get:
eV = (1/2)m[tex]v^2[/tex]
Solving for v, we get:
v = √(2eV/m)
Substituting the values for e, V, and m, we get:
[tex]v =\sqrt{ [(2 \times 1.6 x 10^{-19} C \times V) / 9.11 \times 10^{-31} kg]}[/tex]
Simplifying this expression, we get:
[tex]v = 5.93 \times 10^7 \times \sqrt{V}[/tex]
Therefore, the final speed of an electron accelerated through a potential difference V, starting from rest, is given by the expression [tex]v = 5.93 \times 10^7 \times \sqrt{V}[/tex], where v is in meters per second and V is in volts.
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three objects a b c are placed 0.50 m apart along a straight line. If a and b have equal masses of 10.0kg and c has a mass of 15.0kg, what is the net gravitational force on b due to a and c?
The net gravitational force on b due to a and c is 5.338 x 10^-8 N.
What is the net gravitational force?The net gravitational force on b due to a and c can be calculated using the formula:
F = G (m1m2) / r^2
where;
F is the gravitational force, G is the gravitational constant (6.67 x 10^-11 N m^2/kg^2), m1 and m2 are the masses of the two objects, and r is the distance between them.First, let's calculate the gravitational force between a and b:
F1 = G (m1m2) / r^2
= 6.67 x 10^-11 * (10.0 x 10.0) / (0.50/2)^2
= 1.067 x 10^-7 N
Next, let's calculate the gravitational force between b and c:
F2 = G(m2m3) / r^2
= 6.67 x 10^-11 (10.0 x 15.0) / (0.50/2)^2
= 1.67 x 10^-7 N
The net gravitational force on b due to a and c is the vector sum of these two forces:
Fnet = F2 - F1
= 1.67 x 10^-7 N - 1.067 x 10^-7 N
= 5.338 x 10^-8 N
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A car needs to generate 75. 0 hp in order to maintain a constant velocity of 18. 2 m/s on a flat road. What is the magnitude of the total resistive force acting on the car (due to friction, air resistance, etc. )
Answer:
the magnitude of the car is
F=307.9N
Explanation:
The expression for the power in terms of force and velocity is as follows;
P=Fv
Here, P is the power, F is the force and v is the velocity.
Rearrange the above expression to get the value of the force.
F=\frac{P}{v}
Convert power from horsepower to watt.
P=75.0 hp
P= (75)(745.7) W
P= 55,927.5 W
Put P= 55,927.5 W and v= 18.2 meter per second in the above expression.
F=\frac{55,927.5}{18.2}
F= 3072.9 N
Therefore, the magnitude of the force is F= 3072.9 N.
What does the table suggest about the acceleration of the marble and why?
The table suggests that the acceleration of the marble increases steadily over time due to the increasing force being applied to it. This is because acceleration is directly proportional to the force applied, according to Newton's second law of motion (F = ma).
Newton's second law is a quantitative description of the changes that a force can produce on the motion of a body. It states that the time rate of change of the momentum of a body is equal in both magnitude and direction to the force imposed on it.
Newton's second law is often stated as F=ma, which means the force (F) acting on an object is equal to the mass (m) of an object times its acceleration (a). This means the more mass an object has, the more force you need to accelerate it. And the greater the force, the greater the object's acceleration.
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when its 75 kw (100 hp) engine is generating full power, a small single-engine airplane with mass 700 kg gains altitude at a rate of 2.5 m/s ( 150 m/min, or 500 ft/min ) . what fraction of the engine power is being used to make the airplane climb? (the remainder is used to overcome the effects of air resistance and of inefficiencies in the propeller and engine.)
The fraction of the engine power used to make the airplane climb is 0.14.
The fraction of the engine power used to make the airplane climb can be determined by the equation Pclimb/Pengine = mgh/Pengine, where Pclimb is the power used to climb, m is the mass of the airplane, g is the acceleration due to gravity, and h is the rate of climb. In this case, Pclimb = 75 kW, m = 700 kg, g = 9.81 m/s2, and h = 2.5 m/s. Plugging these numbers in, we get:
Pclimb/Pengine = (700 kg)(9.81 m/s2)(2.5 m/s)/75 kW
Pclimb/Pengine = 0.14
Therefore, the fraction of the engine power used to make the airplane climb is 0.14.
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Look carefully at this telescopic photo of the Moon. All the following statements are true. Which one is proved by the fact that the line dividing the dark and bright regions is not perfectly straight?
The Moon's surface is not perfectly smooth but rather has mountains and valleys.
Answer:
Yes you're correct
Explanation:
The Moon's surface is not perfectly smooth but rather has mountains and valleys. Imagine looking at a sponge at a certain angle and put a dim flashlight behind the sponge. You can see that the grooves make it so its not a perfectly straight shadow.
The fact that the line dividing the dark and bright regions of the Moon is not perfectly straight proves that the Moon's surface is not perfectly smooth but rather has mountains and valleys.This is because the terrain of the Moon is comprised of mountains, craters, and valleys, meaning that the line separating the dark and bright regions will not be completely straight.
The irregularities of the terrain cause the line to appear wavy, and thus not completely straight. This tells us that the surface of the Moon is far from perfectly smooth.
To illustrate this further, a comparison can be drawn between the Moon and a billiard ball. If the Moon's surface were perfectly smooth, the line separating the dark and bright regions would be perfectly straight, just as if a billiard ball had been sliced in half. However, since the surface of the Moon is not perfectly smooth, the line appears wavy due to the irregularities of the terrain.
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