1. Which of the following is a vector quantity?
E.None of these

2. Which of the following is NOT an example of accelerated motion?
A.Vertical component of projectile motion
B.Circular motion at constant speed
C.A swinging pendulum
D.Earth's motion about sun
E.Horizontal component of projectile motion

3. The velocity of a projectile equals its initial velocity added to:
A.a constant horizontal velocity
B.a constant vertical velocity
C.a constantly increasing horizontal velocity
D.a constantly increasing downward velocity
E.a constant velocity directed at the target


The airplane shown is in level flight at an altitude of 0.50 km and a speed of 150 km/h. At what distance d should it release a heavy bomb to hit the target X? Take g = 10 m/s2.

A.150 m
B.295 m
C.417 m
D.2550 m
E.15,000 m

5. An object is shot from the back of a truck moving at 30 mph on a straight horizontal road. The launcher is aimed upward, perpendicular to the bed of the truck. The object falls:
A.in front of the truck
B.behind the truck
C.on the truck
D.depends on the initial speed of the object
E.depends on the value of g


A stone is thrown horizontally from the top of a 20-m high hill. It strikes the ground at an angle of 45°. With what speed was it thrown?

A.14 m/s
B.20 m/s
C.28 m/s
D.32 m/s
E.40 m/s

7. A stone is thrown outward from the top of a 59.4-m high cliff with an upward velocity component of 19.5 m/s. How many seconds will the stone be in the air?


Which of the curves on the graph below best represents the veticle component vy versus t for a projectile fired at an angle of 45° above the horizontal?



A cannon fires a projectile as shown. The dashed line shows the trajectory in the absence of gravity; points MNOP correspond to one second intervals. Using g = 10 m/s2, the lengths X,Y,Z are:

A.5 m, 10 m, 15 m
B.5 m, 20 m, 45 m
C.10 m, 40 m, 90 m
D.10 m, 20 m, 30 m
E.0.2 m, 0.8 m, 1.8 m

10. A particle moves at constant speed in a circular path. The instantaneous velocity and instantaneous acceleration vectors are:
A.both tangent to the circular path
B.both perpendicular to the circular path
C.perpendicular to each other
D.opposite to each other
E.none of the above

11. Two objects are traveling around different circular orbits with constant speed. They both have the same acceleration but object A is traveling twice as fast as object B. The orbit radius for object A is _______ the orbit radius for object B.
C.the same as
E.four times

12. For a biological sample in a 1.0-m radius centrifuge to have a centripetal acceleration of 25g its speed in m/s must be:

13. A stone is tied to the end of a string and is swung with constant speed around a horizontal circle with a radius of 1.5 m. If it makes two complete revolutions each second, its acceleration is:
A.0.24 m/s2
B.2.4 m/s2
C.24 m/s2
D.240 m/s2
E.2400 m/s2

14. A boat is able to move through still water at 20 m/s. It makes a round trip to a town 3.0 km downstream. If the river flows at 5 m/s, the time required for this round trip is:
A.120 s
B.150 s
C.200 s
D.300 s
E.320 s


A girl wishes to row across a river to a point directly opposite as shown. She can row at 2 m/s in still water and the river is flowing at 1 m/s. At what angle with respect to the line joining the starting and finishing points should she point the bow (front) of her boat?


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