There are 10 multiple choice questions. For each problem, please circle the resp

Question

There are 10 multiple choice questions. For each problem, please circle the response which best answers the question or completes the sentence.
Question 1 A constant force F1 is exerted horizontally on a block of mass M that is initially at rest on a level frictionless surface. F1 acts for a short time interval t1 and gives the cart a final speed vf. If we repeat the experiment using a force F2= 1%u20442 F1, how long would F2 need to be exerted on the block to achieve the same final speed vf? 1. t2=4 t12. t2=2t1 3. t2= 1%u20442 t14. t2= 1%u20444 t1

Question 2 Consider a person standing in an elevator that is accelerating upward. The upward normal force N exerted by the elevator floor on the person is ... 1. larger than 2. identical to 3. smaller than the downward weight W of the person.

Question 3 Consider a car at rest. The downward gravitational pull of Earth on the car and the upward contact force of Earth on the car are equal and opposite because of ... 1. Newton%u2019s First Law. 2. Newton%u2019s Third Law. 3. neither of the above.

Question 4 Consider two vectors, V1 and V2:
The magnitude and direction of are ...
1. 14, 8.1o below the positive x axis. 3. 7.3, 15o above the positive x axis.
2. 4.
14, 8.1o above the negative x axis. 7.3, 15o below the negative x axis.

Question 5 A distance runner completes a marathon (distance = 26 miles and 1155 feet) in a time of three hours. How long would it take this runner to complete a 20-km race if she runs at the same average speed? 1. 54 min 2. 1 hour, 10 min 3. 1 hour, 25 min 4. 1 hour, 32 min

Question 6 In the 2008 Summer Olympics, Michael Phelps won the 100-m butterfly swim in a time of 50.58 seconds. The second place swimmer, Milorad C%u030Cavic%u0301, finished with a time of 50.59 seconds. Based on this information, how far ahead of C%u030Cavic%u0301 was Phelps when Phelps finished the race? 1. 2 cm 2. 3. 0.2 cm 4.

Question 7 A crash-test car is traveling at 85 km/h when it crashes into of the car compresses 0.70 m before coming to rest. What is the average deceleration of the car during the crash 1. 17 m/s22. 3. 140m/s24.

Question 8 The position of an object is plotted along the vertical axis while time is plotted on the horizontal axis. Over which region of the figure does the object have the greatest average speed? 1- Between point-A and point-B, 2- Between point-B and point-C. 3- Between point-C and point-D. 4- Between point-D and point-E.
a wall. During the crash the front
event? 34 m/s2 400 m/s2


Question 9 A student pulls a box of books on a smooth horizontal floor with a force of 100 N in a direction of 37.0o above the horizontal. If the mass of the box and the books is 40.0 kg, what is the normal force on the box?
1. 292 N 2. 312 N 3. 332 N 4. 392 N
Question 10 Two ice skaters are at rest facing each other. Skater #1 weighs 800-N and skater #2 weighs 600-N. The two skaters push each other away. Which of these statements is true?
1. 2. 3.
Skater #1 will be moving away from the starting point with greater speed than skater #2.
Skater #1 will be moving away from the starting point with less speed than skater #2.
Skater #1 will be moving away from the starting point with the same speed as skater #2.



part II %u2013 Written Problems (25 points each) There are two problems which require you to write the answer and show the equations and thought process you used to arrive at the answer. Also please include free-body diagrams where appropriate. You may write on the front and back of each page. If you need additional paper, it will be provided. Remember to write your name and the problem number on any additional sheets.
Question 11
Block 1 (mass = m1) is connected by and ideal cord over an ideal pulley to block 2 (mass = m2) on a frictionless inclined plane as shown.
(a 10 pts)
(b 10 pts) (c 5 pts)
Draw free body diagrams for both blocks. Include all the forces acting on each and specify a coordinate system for each.
Find the acceleration of block 1 in terms of m1, m2, %u03B8 and g. Find the tension in the cord in terms of m1, m2, %u03B8 and g.Question 12


A cannonball is shot from a cliff of height h=115 m with a velocity of 65.0 m/s at an angle of 35.0o. (a 10 pts) What is the maximum height which the cannonball reaches (relative to the top
of the cliff)?
(b 15 pts) What is the horizontal distance X which the cannonball travels before hitting point P?

please show me working, thus I could understand.Thank you

Explanation / Answer

1 3

2) 3

3)

2

4)

1

5)

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