Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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An object that is shot through the air is called a
a. | protractor. | c. | parabola. | b. | projectile. | d. | proboscis. |
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2.
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Karl is at a carnival. One of the midway games requires him to shoot at
falling targets with an air rifle. Where should Karl aim?
a. | He should aim below the falling target. | b. | He should aim above
the falling target. | c. | He should aim directly at the
target. | d. | He should aim at the ground below the target. |
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3.
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To determine the y-component of a projectile’s velocity, what operation is
performed on the angle of the launch?
a. | secant | c. | cosine | b. | tangent | d. | sine |
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4.
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A strobe-light series of pictures is taken of a red ball and a blue ball.
The red ball was allowed to drop straight down, and the blue ball was given an initial horizontal
velocity. Lines are drawn connecting each red ball image with the corresponding blue ball
image. Describe the lines connecting the images.
a. | The lines slope down from the red ball to the corresponding blue
ball. | b. | The lines slope up from the red ball to the corresponding blue
ball. | c. | The lines are vertical. | d. | The lines are
horizontal. |
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Short Answer
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5.
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Explain whether the velocity of an object as measured by a stationary observer
in a constant-velocity frame of reference is affected by the motion of the frame of reference.
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Problem
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6.
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Two grenades, A and B, are thrown horizontally with different speeds from the
top of a cliff 70 m high. The speed of A is 2.50 m/s and the speed of B is 3.40 m/s. Both grenades
remain in air for 3.77 s. Assume that the acceleration due to gravity is 9.86 m/s2. What
is the distance between A and B if they are thrown along the same straight line?
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