Physics 101
World Wide Web Example Exam III
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1. If a marathoner can run with an average speed of 10 mph, how far could she run in 2 hours?
(a) 5 miles
(b) 10 miles
(c) 12 miles
(d) 20 miles

2. An object is accelerating _____.
(a) only when its speed changes.
(b) only when its direction changes.
(c) when its speed or direction changes.
(d) if its velocity is large.

3. A force is a vector quantity because it has both __.
(a) magnitude and direction.
(b) mass and acceleration.
(c) action and reaction counterparts.

4. Inertia is a measure of an object's _____.
(a) weight.
(b) force.
(c) mass.
(d) gravity.
(e) center of mass.

5. If the net force on an object is directed due west, which way does the acceleration point?
(a) due west
(b) due east
(c) West only if the velocity is west.
(d) It could be in any direction.

6. The action and reaction forces of Newton's third law _____.
(a) is the same as the unbalanced force F in Newton's second law
(b) are in the same direction
(c) are always contact forces
(d) act on different bodies

7. A projectile launched at an angle follows a _____ path.
(a) parabolic
(b) straight
(c) hyperbolic
(d) changing

8. A yellow car takes 10 minutes to go from milepost 101 to milepost 109. A red car takes 10 minutes to go from milepost 11 to milepost 21. Which car has the higher average speed?
(a) the yellow one
(b) the red one
(c) The average speeds are the same.
(d) Not enough information to be able to say.

9. Which of the following could be a velocity?
(a) 5 meters west
(b) 5 meters per second
(c) 5 meters per second west
(d) 5 meters per second per second
(e) all of these

10. An object weighs 30 N on earth. A second object weighs 30 N on the moon. Which has the greater mass? (a) the one on earth.
(b) the one on the moon.
(c) they have the same mass.
(d) not enough information to say.

11. Which of the following is not a vector quantity? (a) velocity.
(b) speed.
(c) acceleration.
(d) none are vector quantities.
(e) all are vector quantities.

12. The same net force is applied to two blocks. If the yellow one has a larger mass than the blue one, which one will have the larger acceleration?
(a) the yellow block
(b) the blue block
(c) They have the same acceleration.
(d) We cannot say.

13. A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, its horizontal component of velocity
_____.
(a) increases.
(b) remains unchanged.
(c) decreases.

14. What is the net force on an 800-kg airplane flying with a constant velocity of 160 km/hour north?
(a) zero
(b) 160 N
(c) 800 N
(d) 128 000 N

15. It takes about 11 minutes to get to the SFA observatory, which is 11 miles away. What is the average speed for the trip in this case?
(a) 100 mph (b) 1 mph (c) 10 mph
(d) 60 mph (e) 55 mph


16. After jumping from an airplane a skydiver will fall until the air resistance equals his weight. At that point
(a) he will fall no farther
(b) he will fall faster
(c) he will fall with constant speed
(d) he will hit the ground

17. A kilogram is a measure of an object's
(a) volume
(b) force
(c) mass
(d) weight
18. An airplane flies 100km/h is still air. If the plane heads north and the wind blows east at 100km/h, then how fast will it travel relative to the ground?
(a) 100 km/h
(b) 141 km/h
(c) 200 km/h
(d) 0 km/h

19. A red car takes 10 minutes to go from milepost 101 to milepost 109. A yellow car takes 10 minutes to go from milepost 11 to milepost 21. Which car has the higher average speed?
(a) the yellow one
(b) the red one
(c) The average speeds are the same.
(d) Not enough information to be able to say.

20. Without air resistance, a projectile fired horizontally at 8000m/s from atop a mountain will
(a) circle the Earth.
(b) travel in a straight line.
(c) will hit the ground at the foot of the mountain.
(d) escape from Earth's gravity.

21. Which of the following is not a vector quantity?
(a) velocity
(b) speed
(c) force
(d) acceleration

22. An object weighs 10 N on earth. A second object weighs 10 N on the moon. Which has the greater mass?
(a) the one on earth
(b) the one on the moon
(c) they have the same mass
(d) not enough information to say


23. You push on an box sitting on the floor horizontally with a force of 15 Newtons and the box does not move. The force of friction on the box is
(a) 0 Newtons
(b) 15 Newtons in the direction of your push
(c) 15 Newtons opposite to your push
(d) less that 15 Newtons.

24. How much acceleration does a 747 jumbo jet of mass 40,000kg experience in takeoff when the thrust of all of the engines is 80,000 N?
(a) 1m/s2 (b) 2 m/s2
(c) 8 m/s2 (d) 4 m/s2

25. Dan drops a stone down a well and sees it hit the water 2 seconds later. How deep is this well?
(Neglect air resistance.)
(a) 9.8 m (b) 19.6m (c) 4.9m
(d) 14.7m (e) 29.4m

26. Dan drops a stone down a well and sees it hit the water 2 seconds later. What was the speed of impact of the stone? (Neglect air resistance.)
(a) 9.8 m/s (b) 19.6m/s (c) 4.9m/s
(d) 14.7m/s (e) 29.4m/s

27. How far below an initial straight-line path will a projectile fall in 1 second in the absence of air resistance?
(a) 4.9m (b) 9.8m (c) 19.6m
(d) not enough information is given to answer this question

28. If we find an object that is not moving even though we know it to be acted on by a force, what inferences can we draw?
(a) the object is in a state of mechanical equilibrium
(b) the acceleration of the object is zero
(c) the net force on the object is zero
(d) all of these

29. Suppose you swim in a direction directly across a flowing river and end up at a distance downstream greater than the width of the river. How does your swimming speed compare to the flow rate of the river?
(a) your swimming speed is faster than the river's speed
(b) the river's speed is greater than your swimming speed
(c) the river's speed and your swimming speed are the same
(d) this scenario is not possible

30. What is Michael Jordan's hang time if he jumps 1 meter high?
(a) 0.45 seconds
(b) 0.9 seconds
(c) 0.2 seconds
(d) 36 seconds
(e) none of these

31. Suppose that you are driving along in an open car and throw a ball straight up into the air. While the ball is still in the air you step on the accelerator. Where does the ball land relative to the car? Neglect air resistance.
(a) the ball lands in the car
(b) the ball lands behind the car
(c) the ball lands in front of the car
(d) the ball explodes in mid-air

32. Suppose that you are driving along in an open car and throw a ball straight up into the air. While the ball is still in the air you step on the brake. Where does the ball land relative to the car? Neglect air resistance.
(a) the ball lands in the car
(b) the ball lands behind the car
(c) the ball lands in front of the car
(d) the ball explodes in mid-air

33. Suppose that you are driving along in an open car and throw a ball straight up into the air. While the ball is still in the air you maintain a constant velocity. Where does the ball land relative to the car? Neglect air resistance.
(a) the ball lands in the car
(b) the ball lands behind the car
(c) the ball lands in front of the car
(d) the ball explodes in mid-air