Answers25-26 TX-Physics A-CRCircular Motion

Introduction to Forces Answers

20 verified answers1 views
1
Free Preview

When is an object moving in uniform circular motion?

A
when it speeds up around a curve
B
when its tangential speed is constant
C
when it has no net force acting on it
D
when its acceleration is tangent to a circle
3
Free Preview

Hannah has information about an object in circular orbit around Earth. mEarth = 6.0 × 1024 kgG = 6.67 × 10–11 rearth=6.0 x 106 m

Question illustration
A
the mass of the orbiting object
B
the distance of the orbiting object to Earth
C
the orbital period of Earth
D
the radius of Earth
4

Enrique is given information about a satellite orbiting Earth.r = 3.8 × 108 mT = 18 days

A
convert the radius to kilometers
B
convert the orbital period to seconds
C
find the square root of the radius
D
find the square root of the orbital period
5

Two satellites, X and Y, are orbiting Earth. Satellite X is1.2 × 106 m from Earth, and Satellite Y is 1.9 × 105 m from Earth.

A
Satellite X has a greater period and a faster tangential speed than Satellite Y.
B
Satellite X has a greater period and a slower tangential speed than Satellite Y.
C
Satellite X has a shorter period and a faster tangential speed than Satellite Y.
D
Satellite X has a shorter period and a slower tangential speed than Satellite Y.
6

The formulas used to analyze the horizontal and vertical motion of projectiles launched at an angle involve the use of which function(s)?

A
tangent only
B
cosine only
C
sine and tangent
D
cosine and sine
7

Which situation during a basketball game involves centripetal acceleration?

A
The official tosses the ball up for the opening tip-off.
B
A player passes the ball to another player.
C
The basketball bounces off the backboard.
D
A player spins a basketball on his finger.
9

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

Question illustration
A
a satellite in orbit around a moon
B
a child on a swing that just stopped
C
a ball twirled on a string that just broke
D
a car driving around a curve
10

0.0250.0372.18.0

A
0.025
B
0.037
C
2.1
D
8.0
11

Which formula can be used to find the tangential speed of an orbiting object?

A
v =
Option A
B
v =
Option B
C
v = G
Option C
D
v = r
Option D
12

The tip of a pinwheel is 0.24 m from the center. The pinwheel spins 5 times each second. What is the tangential speed of the tip of the pinwheel?

A
0.30 m/s
B
1.2 m/s
C
1.5 m/s
D
7.5 m/s
13

Which best explains why astronauts appear weightless when they are in a space shuttle orbiting Earth?

A
They are falling toward Earth at the same rate as the space shuttle.
B
They are falling toward Earth at a faster rate than the space shuttle.
C
They are too far from Earth to experience gravity.
D
They are too far from Earth to experience air resistance.
14

Which would cause the greatest increase in the acceleration of a satellite?

A
a decrease in the radius and the tangential speed
B
an increase in the radius and the tangential speed
C
a decrease in the radius and an increase in the tangential speed
D
an increase in the radius and a decrease in the tangential speed
15

A ball that has a mass of 0.25 kg spins in a circle at the end of a 1.6 m rope. The ball moves at a tangential speed of 12.2 m/s.

A
1.9 N
B
23 N
C
59 N
D
93 N
18

What is the only force acting on an object orbiting Earth?

A
air resistance
B
friction
C
inertia
D
gravity
19

0.00510.432584

A
0.0051
B
0.43
C
25
D
84
20

Sid created a chart to summarize characteristics of satellite motion. Which best describes Sid’s error?

Question illustration
A
Tangential speed changes throughout a satellite’s orbit.
B
Centripetal force is perpendicular to the velocity of the satellite.
C
Tangential speed increases with a satellite’s increasing distance from Earth.
D
Centripetal force can sometimes slow down a satellite in orbit.
21

How does an object’s motion change as a result of centripetal acceleration?

A
The speed decreases in the same direction.
B
The speed increases in the same direction.
C
The direction changes along with the speed.
D
The direction changes but not the speed.
22

Lexy used the formula shown to calculate the force of gravity on a space shuttle.Fg = G

Question illustration
A
the difference between Earth’s mass and the space shuttle’s mass
B
the sum of Earth’s mass and the space shuttle’s mass
C
the mass of Earth
D
the mass of the space shuttle
23

decreasesincreasescontinuously fluctuatesstays constant

A
decreases
B
increases
C
continuously fluctuates
D
stays constant
24

Rosa uses the formula (vi cos)t to do a calculation. Which value is Rosa most likely trying to find?

Question illustration
A
the vertical acceleration of a projectile launched at an angle
B
the vertical acceleration of a projectile launched horizontally
C
the horizontal displacement of a projectile launched at an angle
D
the horizontal displacement of a projectile launched horizontally

Did you find these answers helpful?

More from this Course

Quiz
20 verified answers

Unit Test

Quiz
10 verified answers

Circular Motion

Quiz
10 verified answers

Orbital Motion