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Physics Question Bank
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25 Questions

1. Two equal-mass rocks tied to strings are whirled in horizontal circles. The radius of circle 2 is twice that of circle 1. If the period of motion is the same for both rocks, what is the tension in string 2 compared to string 1?

2. If the average velocity is non-zero over some time interval, does this mean that instantaneous velocity is never zero at the same interval

3. A block of mass m rests on the floor of an elevator that is accelerating upward. What is the relationship between the force due to gravity and the normal force on the block?

4. Which contributes more to the cost of your electric bill each month, a 1500-Watt hair dryer or a 600-Watt microwave oven?

5. A golfer making a putt gives the ball an initial velocity of v0, but he has badly misjudged the putt, and the ball only travels one-quarter of the distance to the hole. If the resistance force due to the grass is constant, what speed should he have given the ball (from its original position) in order to make it into the hole?

6. Mike applied 10 N of force over 3 m in 10 seconds. Joe applied the same force over the same distance in 1 minute. Who did more work?

7. Alice and Bill are at the top of a cliff of height H. Both throw a ball with initial speed v0, Alice straight down and Bill straight up. The speeds of the balls when they hit the ground are vA and vB. If there is no air resistance, which is true?

8. A book is lying at rest on a table. The book will remain there at rest because:

9. If a car traveling 60 km/hr can brake to a stop within 20 m, what is its stopping distance if it is traveling 120 km/hr? Assume that the braking force is the same in both cases.

10. When throwing a ball straight up, which of the following is true about its velocity and acceleration at the highest point

11. A battleship simultaneously fires two shells at two enemy submarines. The shells are launched with the same initial velocity. If the shells follow the trajectories shown, which submarine gets hit first?

12. From the same height (and at the same time), one ball is dropped and another ball is fired horizontally. Which one will hit the ground first?

13. If the velocity of a car is non zero can the acceleration of a car be zero.

14. Two vectors A and B are at right angles to each other. The magnitude of A is 12 units, and the magnitude of B is 5 units. What is the magnitude of vector A minus vector B?

15. write out .0038 g in kg using scientific notation with the correct sig figs

16. A ball is thrown straight upward with some initial speed. When it reaches the top of its flight (at height h) a second ball is thrown straight upward with the same inital speed. Where will the balls cross paths

17. Can friction do positive work?

18. does displacement of an object depend on the specific location of the origin of the coordinate system?

19. A block of mass m rests on the floor of an elevator that is moving upward at constant speed. What is the relationship between the force due to gravity and the normal force on the block?

20. A child on a skateboard is moving at a speed of 2 m/s. After a force acts on the child, her speed is 3 m/s. What can you say about the work done by the external force on the child?

21. A tortoise travels at 2.51 cm/s for 4.512 s which answer gives the total distance using the correct number of sig figs?

22. If two vectors are given such that A + B = 0, what can you say about the magnitude and direction of vectors A and B?

23. If you push with force F on either the heavy box (m1) or the light box (m2), in which of the two cases below is the contact force between the two boxes larger?

24. Which of the following is correct? A. If an equation is dimensional correct, it must be true and if not dimensional correct, it may be true. B. If an equation is dimensionally correct, it could be true, if it is not demensionally correct, it cannot be true

25. You are on the street, trying to hit a friend with a water balloon. He is sitting in his dorm room window above your position and is aiming at you with HIS water balloon! You aim straight at him and shoot and he does the same in the same instant. Do the water balloons hit each other?

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