An object with a mass of 5 kg is dropped and takes 9 s to hit the ground. Then another object with a mass of 10 kg is dropped from the same point. How long does it take to hit the ground?
a. 9 s
b. 18 s
c. 5 s
d. 81 s
e. 729 s
a
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The arrow in the photo on the left points to the location of the star that has exploded as a supernova in the photo on the right. From this photo pair alone, what can we conclude about the star that exploded? (Assume that we know the star was not a member of a binary system.)
A) It was a high-mass star with at least 8 times the mass of the Sun. B) It is now a black hole. C) It was a red giant star. D) Before the supernova, the star lived for at least a billion years.
Venus has a higher average surface temperature than Mercury. Why?
A) because its surface is heated by an extreme greenhouse effect B) because it is closer to the Sun C) because its surface is covered with hot lava from numerous active volcanoes D) because its slow rotation gives it more time to heat up in sunlight
Exhibit 4-2Newton approximated motion in a circle as a series of linear motions, as in the polygon below.
Assume that the particle moves at constant speed vA from A to B, and at constant speed vB from B to C.Use this exhibit to answer the following question(s).
Refer to Exhibit 4-2. The direction of the acceleration, 
, at point B, is shown by the arrow in
A.
B.
C.
D.
E.
What is the relationship between density and distance for the four Galilean moons of Jupiter?
A) density increases with increasing distance B) density remains constant with distance C) density first decreases and then increases with distance D) density decreases with distance