The direction of the Moon's revolution around
Earth is
a) westward.
b) eastward.
c) clockwise (looking from above Earth's north pole).
d) variable, because the Moon changes its orbital direction as it changes phases.
[Ques. 2] The diameter of the Moon is approximately
a) 1200 km
b) 3500 km.
c) 8000 km.
d) 6,000,000 km.
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[Ques. 3] Two bodies of equal mass m collide and stick together. The quantities that always have equal magnitude for both masses during the collision are
a. their changes in momentum.
b. the force each exerts on the other.
c. their changes in kinetic energy.
d. all of the above.
e. only (a) and (b) above.
[Ques. 4] When the rate of burn and the exhaust velocity are constant, a rocket ascends with
a. decreasing acceleration.
b. decreasing velocity.
c. constant velocity.
d. constant acceleration.
e. increasing acceleration.
[Ques. 5] Keplers Third Law relates
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(a) density and pressure
(b) period and semi-major axis
(c) semi-major axis and orbital velocity
(d) period and orbital velocity
[Ques. 6] The value of the momentum of a system is the same at a later time as at an earlier time if there are no
a. collisions between particles within the system.
b. inelastic collisions between particles within the system.
c. changes of momentum of individual particles within the system.
d. internal forces acting between particles within the system.
e. external forces acting on particles of the system.
[Ques. 7] The planet whose surface is hidden by clouds is
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(a) Earth
(b) Mars
(c) Jupiter
(d) Venus
[Ques. 8] An astronaut outside a spaceship hammers a loose rivet back in place. What happens to the astronaut as he swings the hammer?
a. Nothing. The spaceship takes up the momentum of the hammer.
b. He moves away from the spaceship.
c. He moves towards the spaceship.
d. He moves towards the spaceship as he pulls the hammer back and moves away from it as he swings the hammer forward.
e. He moves away from the spaceship as he pulls the hammer back and moves toward it as he swings the hammer forward.
[Ques. 9] The planet that rotates on its side is
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(a) Earth
(b) Jupiter
(c) Mars
(d) Uranus
[Ques. 10] There are rings around
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(a) the terrestrial planets
(b) the Jovian planets
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