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Unit Test — Unit test Answers

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Cecelia dropped a ball from a height of 2 m. The ball fell in a straight path down to the ground.

A
tossing it horizontally at a slower speed
B
tossing it horizontally at a faster speed
C
dropping it from a shorter distance
D
dropping it from a greater distance
2
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Leo drew a force diagram to represent a satellite in orbit around Earth.

Question illustration
A
make the Fg vector longer
B
change the vector labeled Fair so it is labeled Fp
C
add an Fp vector at the center and pointing left
D
remove the Fair vector
3

What is the vertical acceleration of a dart that is launched horizontally with an initial velocity of 2.3 m/s?

A
–9.8 m/s2
B
0 m/s2
C
2.3 m/s2
D
9.8 m/s2
4

The diagram shows two balls released from a device at the same time. The ball on the left falls freely from rest, and the ball on the right is launched horizontally.

Question illustration
A
Both balls have constant velocity and are acted on by gravity.
B
Both balls are acted on by gravity and are accelerating downward.
C
Both balls are pulled downward and have zero acceleration.
D
Both balls have zero acceleration and have constant velocity.
5

Question text not available

Answer not available
6

Which formula can be used to find the centripetal acceleration of an orbiting object?

A
ac =
Option A
B
ac =
Option B
C
ac =
Option C
D
ac =
Option D
7

An object is represented by the dot on the motion map.

Question illustration
A
a car driving over the top of a hill
B
a ball on a string that stopped at the top of a vertical loop
C
a roller coaster car at the top of a vertical loop of track
D
a bug on the top of a rolling hula hoop
8

A bicycle tire has a radius of 0.23 m. The tire spins at a constant speed with a centripetal acceleration of 42 m/s2.

A
3.1 m/s
B
6.5 m/s
C
9.7 m/s
D
14 m/s
9

A cyclist rides at a constant speed of 4.5 m/s around a curve. If the centripetal acceleration is 29 m/s2, what is the radius of the curve?

A
0.16 m
B
0.70 m
C
6.4 m
D
34 m
10

Which best illustrates projectile motion?

A
A pictorial diagram showing a hot air balloon in four different positions, each the same height from the ground and equally spaced.
Option A
B
A pictorial diagram with a rocket launched straight upward. The first three positions of the rocket are shown with equal spacing between them.
Option B
C
A pictorial diagram with a person swimming and position shown in equal time intervals and equally spaced.
Option C
D
A pictorial diagram of a person hopping sideways at 5 different positions. The start and end positions are on the ground. The third image is the highest off the ground.
Option D
11

The orbital period of a satellite is 2 × 106 s and its total radius is 2.5 × 1012 m. The tangential speed of the satellite is m/s. (Round to the nearest whole number, do not add any punctuation.)

Answer not available
12

In the equation for centripetal force, which expression represents the centripetal acceleration of the object?

A
mv2
B
StartFraction m over r EndFraction
Option B
C
StartFraction v Superscript 2 Baseline over r EndFraction
Option C
D
StartFraction m times v Superscript 2 Baseline over r EndFraction
Option D
13

The pitcher on a softball team starts a windup to throw a pitch, as shown.Note: In softball, the ball is pitched underhand in a circular motion in the direction of the arrow.

Question illustration
A
W
B
X
C
Y
D
Z
14

An object moving in a circle is represented by the motion map.

Question illustration
A
W
B
X
C
Y
D
Z
15

Rahul wants to change the motion map shown so that it shows uniform circular motion.

Question illustration
A
He should change the length of each vector that points toward the center so that it is the same length as the vector pointing tangent to the circle at that point.
B
He should change the lengths of the vectors that point tangent to the circle so that each is the same length.
C
He should change the direction of the vectors that are tangent to the circle so that each points away from the center of the circle.
D
He should change the direction of the vectors that are tangent to the circle so that each points toward the center of the circle.

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