An object that has twice as much mass as another object also has twice as much
A) inertia.
B) velocity.
C) gravitational acceleration.
D) volume.
E) all of the above
Answer: A
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Water that is denser than surrounding water sinks. With respect to the densities of deeper water, how far does it sink?
A) until it encounters water of the same density B) until it encounters water that is less dense C) until it encounters water that is denser D) None of the above.
What effect do even thin clouds of dust have on light passing through them?
A) The light that passes through them is blue shifted due to the cloud's approach. B) It dims and reddens the light of all more distant stars. C) Even a little can completely block all light, such as the Horsehead Nebula. D) Its motion causes the light of stars beyond to twinkle. E) Its motion causes all light to be redshifted as it passes through these clouds.
An elevator suspended by a vertical cable is moving downward but slowing down. The force that the cable exerts on the elevator must be
A) greater than the force that Earth exerts on the elevator. B) less than the force that Earth exerts on the elevator. C) equal to the force that Earth exerts on the elevator.
Rita raises a 10kg package to a height of 2.5 m in 2.0 s
(a) How much work did she do on the package? (b) How much power was expended on the package? (c) If she were to raise the package in 1.0 s rather than 2.0 s, how do the work and power change?