What do most scientists believe existed before the Big Bang?
A) nothing
B) the primeval fireball
C) a singularity
D) a black hole
E) everything was inside Earth
A
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As a 4-10 solar mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity
A) decreases. B) first decreases, then increases. C) increases. D) remains roughly constant. E) first increases, then decreases.
The mass of Pluto is 1.25 × 1022 kg and its radius is 1.14 × 106 m. What is the value of g at the surface of Pluto? G = 6.67 x 10-11 N•m2/kg2
A) 0.642 m/s2 B) 9.81 m/s2 C) 1.62 m/s2 D) 3.72 m/s2 E) 1.40 m/s2
Two bulbs are shown in a circuit that surrounds a region of increasing magnetic field directed out of the page. When the switch is closed,
a.
bulb 1 glows more brightly.
b.
bulb 2 glows more brightly.
c.
both bulbs continue to glow with the same brightness.
d.
bulb 1 goes out.
e.
bulb 2 goes out.
A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the average collision force is correct?
A) It is impossible to tell since the masses and velocities are not given. B) The small car experiences the greater average force. C) The small car and the truck experience the same average force. D) The truck experiences the greater average force.