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Exercises

Part 1

Part 2



Part 1

Place name, date, lab number at top of page. Number the problems and place the letter of the correct answer by each number. For example, if you think the answer to 1 is A and the answer to 2 is B, then you would write

Name:

Date:

Lab number:

 

1A

2B

etc.

 

Do not turn in the graphs.

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1.
Figure 2-1

At t = 0 s
A. Rider C is ahead of rider D.
B. Rider D is ahead of rider C.
C. Rider C and D are at the same position.
End of Question 1
2.
Figure 2-1

At t = 0 s
A. C is moving, and D is at rest.
B. D is moving, and C is at rest.
C. C and D are both moving.
D. C and D are both at rest.
End of Question 2

3.
Figure 2-1

At t = 0 s
A. C has a greater velocity than D.
B. D has a greater velocity than C.
C. C and D have the same velocity.
D. C is accelerating.
End of Question 3

4.
Figure 2-1

At t = 10 s
A. C and D are at the same position.
B. C and D have the same velocity.
C. The velocity of D is greater than the velocity of C.
D. C is in front of D.
End of Question 4
5.
Figure 2-2

During the first 8 s
A. C has decreasing velocity and D has increasing velocity.
B. C and D both have decreasing velocities.
C. C and D have the same velocity.
D. C has the same average velocity as D.
End of Question 5
6.
Figure 2-2

During the first 8 s
A. the magnitude of the acceleration of C is greater than the magnitude of D's acceleration.
B. their accelerations are equal in magnitude but opposite in sign.
C. their accelerations are equal in magnitude and equal in sign.
End of Question 6
7.

 Which graph represents an object at rest?
A.
B.
C.
D.

Part 2

Unless told otherwise, assume that air resistance is negligible for all problems.  Also assume that acceleration is constant.

Throughout the course, show all of your work for problems that require calculations. If a problem involves reasoning only, then describe the reasoning (logic) you used to arrive at your conclusion.

 

 

1. A car accelerates from 13 m/s to 25 m/s in 6.0 s.

 

   a. What was its acceleration?

 

   b. How far did it travel in this time?

 

2. A helicopter is ascending vertically with a speed of 5.20 m/s. At a height of 125 m above the Earth, a package (at this height) is dropped from the

     helicopter. How much time does it take for the package to reach the ground?

 

3. What must be your car's average speed e in order to travel 235 km in 3.25 hours?

 

4. A rolling ball moves from x1 = 3.4 cm to x2 = -4.2 cm during the time t1 = 3.0 s to t2 = 6.1 s. What is its average velocity?

 

5. You travel from point A to point B in a car moving at a constant speed of 70 km/hour.  Then you travel the same distance from point B to another

     point C, moving at a constant speed of 90 kn/hour.  What is your average speed?

 

6. An object is dropped (no initial velocity) from a height of 20 meters. How long does it take to reach the ground?

 

7. Assume that a ball is dropped (given no initial velocity) from a height of 60 meters above the ground. How long does it take to reach the ground?

 

8. Assume that a pitcher throws a ball straight up with an initial velocity of 10.0 meters per second.

 

     a.  How high does the ball go as measured from the pitcher's hand upon throwing.

 

    b. Upon return, assume the pitcher catches the ball at the same height from which it was thrown. How long was the ball in the air?

 

9. A car manufacturer claims that the vehicle is capable of an acceleration of 1 m/s2. He also claims the vehicle can reach a velocity 0f 20 m/sec in a

     distance of 100 meters. Assume that the data for acceleration is true. Provide calculations to indicate whether the velocity claim is true or false.