If the plate spacing increases by 1.25 mm for each full turn of a knob, by what amount does the spacing change in millimeters (mm) when the knob goes through half a turn?

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Physics case study

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Preliminary Questions

Note: You will receive full credit for each prediction made in this preliminary section whether or not it matches conclusions you reach in the next section. As part of the learning process it is important to compare your predictions with your results. Do not change your predictions!

As you proceed with this assignment, you’ll be working with a short video clip entitled <Capacitor V_vs_d.mov>. It shows the spacing between a pair of parallel plates increasing by a known amount each time a knob is twisted by a half turn. The potential difference between the plates is measured with both an electrometer and voltage probes connected to a computer (see Fig. 1) so data can be recorded with the Logger software. Before proceeding, you should view the video clip.

(a) Use Equations 1 and 2 to derive an equation that describes how the voltage across a parallel plate capacitor depends on the plate spacing, d, and area, A. Show your work.

(b) If the plate spacing increases by 1.25 mm for each full turn of a knob, by what amount does the spacing change in millimeters (mm) when the knob goes through half a turn?

(c) You should have noticed in frame 5 of the movie that only one plate of the capacitor is being charged positively. The other plate is “grounded.” The right-hand plate and the left-hand plate are separated by only one-half of a turn of the dial. How can we claim this set up is actually a capacitor and thus has equal and opposite excess charges on both plates? Hint: What happens immediately after the first plate is charged? Is induction possible?

(d) What do you expect will happen to the capacitor system as the spacing between the plates increases? Hint: Refer to the equation you derived in section 1(a).

(e) When the potential difference is large the capacitor system is storing more energy than when it is small. Where does the additional energy “come from” as the plate spacing increases?

(f) If the two plates behave like an ideal capacitor, sketch the shape of a graph of voltage vs. spacing you might expect to measure and explain your reasoning.

Describes the general format expected for CHM 1142 and 1143 laboratory reports.

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Archimedes Principle Lab Report

Chemistry I and II
Describes the general format expected for CHM 1142 and 1143 laboratory reports.

Each report should consist of the following sections (these may be altered or amended as appropriate, but in general this is a good format):
1. Introduction and Purpose
2. General Procedures
3. Data and Data Analysis
4. Discussion
5. Conclusions
6. Answers to any questions

Reports should be neat and well organized. Spelling and grammar count. Any graphs or plots should be computer generated (you are welcome to use a computer, but make sure you know what you are doing. Excel in particular is confusing and may not do what you think it is doing) or done on a piece of official graph paper. Notebook paper with hand drawn axes and divisions is Below is an example of a good report using the Sugar Content in Commercial Beverages data that some of you collected.

Explain in one or two sentences how you collected the data and how you processed such data. Explain in one or two sentences what did you do and how you accomplished the tasks

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PHYS LAP ABOUT Kirchhoff’s Rule (Kit)

Laboratory Title: Kirchhoff’s Rule (Kit)

Objective (in one or two sentences):

Apparatus (in one or two sentences):

Theory (in one or two sentences):

Data (Explain in one or two sentences how you collected the data and how you processed such data):

Discussion (Explain in one or two sentences what did you do and how you accomplished the tasks):

Conclusion (Explain in one or two sentences what is your conclusion, is the theory right, is the theory wrong):

A certain object that weighs 20 N is tossed straight upward into the air. Neglecting air resistance, what is the net force on the object when it reaches its highest point? Is the object in equilibrium at this point? Carefully explain.

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Linear Motion Newton’s Second Law Newton’s Third Law of Motion

Answer the following 4 questions

1)A push on a 2-kg brick accelerates it. Neglecting friction, equally accelerating a 10-kg brick requires

  • A just as much force.
  • B 10 times as much force.
  • C 20 times as much force.
  • D one-fifth the amount of force.
  • E …none of the above.

2)A certain object that weighs 20 N is tossed straight upward into the air. Neglecting air resistance, what is the net force on the object when it reaches its highest point? Is the object in equilibrium at this point? Carefully explain.

3)A child tosses a ball straight upward with a speed of 26.9 m/s. The ball is caught on the way down at a point 3.7 m above the point from which it was thrown. Determine the speed of the ball when it was caught and the total length of time the ball was in the air. Your solution should include a properly labeled diagram and your choice of sign convention should be clearly stated.

4)Is it possible for a moving object to reverse its direction of travel while maintaining a constant acceleration? If your answer is yes, provide an example to support your explanation. If your answer is no, carefully explain why.

 

Mikaela throws a ball straight up. Her friend Yi watches the ball from a window above the point where Mikaela released it. The ball passes Yi on the way up, and it has a speed of as it passes him on the way down. How fast did Mikaela throw the ball? (

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DISCUSSION QUESTION

Assume air resistance can be neglected in the questions that follow. Remember to include a sign convention for each question. Also make sure that for each question you include a clearly labeled (i.e. with given information noted) and appropriately-sized diagram Tiny little diagrams without numerical labeling will not receive any credit. Each diagram is worth 1 point, so please don’t forget to include them! Your sign convention must also be presented with each question and is also worth 1 point.

1.Mikaela throws a ball straight up. Her friend Yi watches the ball from a window above the point where Mikaela released it. The ball passes Yi on the way up, and it has a speed of as it passes him on the way down. How fast did Mikaela throw the ball? (8 points)

2.An apple is thrown straight upward with a speed of 27.4 . The apple is caught on the way down at a point above the point from which it was thrown. Determine the speed of the apple when it was caught and the total length of time the apple was in the air. (10 points)

3.A straight track long is used to race small carts (which are big enough for just one person to sit in). During the race, a particular cart travels the first half of the track (assume moving to the right) with a constant speed of 18.12 . On the second half of the track the cart experiences some mechanical difficulties and slows down at a uniform rate of 0.47 2. Determine the total time that it took for the cart to travel the distance. (13 points)

4.A motorist in a small car travels along a certain road at an average speed of 5 and returns along the same road at an average speed of . Calculate the average speed for the round trip. (And don’t say !) To receive full credit, you must do this calculation without assuming a numerical value for the distance or the time. (9 points)

5.A ball is thrown vertically upward from ground level with an initial velocity of 31.6. (14 points)

A)At what subsequent times, relative to the starting point, is it above ground level (i.e. on the way up and on the way down), and what are the corresponding velocities at these times?

B)What is the highest point reached by the ball?

6.A motorcycle starts from rest at a stop sign. It accelerates to the right at for 10.6 seconds, coasts for 5.1 seconds, and then slows down at a rate of in order to stop at the next stop sign. How far apart are the stop signs? (14 points)

 

Figure P4.21 shows an object’s acceleration-versus-force graph. What is the object’s mass?

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 Acceleration-versus-force

I Figure P4.21 shows an object’s acceleration-versus-force graph. What is the object’s mass?

FIGURE P4.21

F (N)

 

What is its maximum acceleration after picking up four passengers and their luggage, adding an additional 400 kg of mass?

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DISCUSSION ESSAY

II A compact car has a maximum acceleration of 4.0 m/s2 when it carries only the driver and has a total mass of 1200 kg.

What is its maximum acceleration after picking up four passengers and their luggage, adding an additional 400 kg of mass?

 

Figure P4.13 shows an acceleration-versus-force graph for three objects pulled by identical rubber bands. The mass of object 2 is 0.20 kg. What are the masses of objects 1 and 3? Explain your reasoning.

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Questions are about Forces and Newton’s Laws of Motion

Figure P4.13 shows an acceleration-versus-force graph for three objects pulled by identical rubber bands. The mass of object 2 is 0.20 kg. What are the masses of objects 1 and 3? Explain your reasoning.

a (ml s2)

5

4

3

2

1

0

FIGURE P4.13

1 2 \ ../3 0 1 2 3 4 5 6

 

How long was the ball in flight? How far did it travel? Ignoring air resistance, how much farther would it travel on the moon than on earth?

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Apollo 14 mission to the moon

III On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. The free-fall acceleration on the moon is 1/6 of its value on earth. Suppose he hit the ball with a speed of 25 m/s at an angle 30° above the horizontal.

  1. How long was the ball in flight?
  2. How far did it travel?
  3. Ignoring air resistance, how much farther would it travel on the moon than on earth?

 

What was the bullet’s flight time? What was the bullet’s speed as it left the barrel?

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DISCUSSION ESSAY

III A rifle is aimed horizontally at a target 50 m away. The bullet hits the target 2.0 cm below the aim point.

  1. What was the bullet’s flight time?
  2. What was the bullet’s speed as it left the barrel?