AnswersPhysicsOrbital Motion

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1
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Which would cause the greatest increase in the acceleration of a satellite?

A
a decrease in the radius and an increase in the tangential speed
B
an increase in the radius and the tangential speed
C
a decrease in the radius and the tangential speed
D
an increase in the radius and a decrease in the tangential speed
3
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Which best compares the satellites? Two satellites, X and Y, are orbiting Earth. Satellite X is 1 point 2 times 10 to the 6th power m from Earth, and Satellite Y is 1 point 9 times 10 to the 5th power m from Earth.

A
Satellite X has a greater period and a faster tangential speed than Satellite Y.
B
Satellite X has a shorter period and a slower tangential speed than Satellite Y.
C
Satellite X has a greater period and a slower tangential speed than Satellite Y.
D
Satellite X has a shorter period and a faster tangential speed than Satellite Y.
4

Which best explains why a satellite accelerates?

A
It is always changing direction.
B
It is constantly slowed by gravity.
C
It is weightless when it is in orbit.
D
It does not have forces acting on it.
5

Why are satellites placed into orbit at least 150 kilometers above Earth’s surface?

A
to increase friction
B
to match Earth’s curvature
C
to create inertia
D
to avoid air resistance
6

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

A
v is equal to cap g the fraction with numerator m sub c e n t r A l and denominator r
B
v is equal to r the fraction with numerator open paren m sub c e n t r A l close paren and denominator cap g
C
v is equal to the fraction with numerator 2 pi r and denominator cap t
D
v is equal to the fraction with numerator square root of 2 pi r end root and denominator cap t
7

Which object would be considered to be in free fall?

A
one that is slowed down by air resistance
B
one that is truly weightless
C
one that experiences both friction and centripetal force
D
one with only gravity acting upon it
8

What causes a satellite to move tangentially to a circular path?

A
inertia
B
air resistance
C
friction
D
gravity
9

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

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