If a red giant appears the same brightness as a red main sequence star, which one isfurther away?
a) the red giant
b) we can't tell
c) it depends on the phase of the Moon
d) the main sequence star
e) they are at the same distance
Answer: a) the red giant
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If the carbon dioxide in Earth's rocks were suddenly released into its atmosphere, what would happen?
a. It would rapidly escape into space. b. It would dissociate into carbon and oxygen. c. It would collect as ice on the north and south poles. d. It would cause a runaway greenhouse effect.
The extended sheet of galaxies that spans 70 Mpc × 200 Mpc and includes about 24,000 galaxies is called the ________
Fill in the blank(s) with correct word
A 500?g block traveling at 60 cm/s slides onto a 1?kg cart as shown. The block stops sliding before reaching the end of the cart
As the block is sliding on the cart,
which object has the larger acceleration?
If a planet has 9 times the radius of the Earth, but has the same density as the Earth, what is the gravitational acceleration at the surface of the planet? (g = 9.8 m/s2)
a. 29.4 m/s2 c. 265 m/s2 b. 88.2 m/s2 d. 39.2 m/s2