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.
d. It would cause a runaway greenhouse effect.
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Two soldiers are marching side by side with a speed of 1.9 m/s, but one of them moves 92 cm for each step he takes, while the other moves only 84 cm. How often are they in step?
A) every 3.2 s B) every 8.7 s C) every 4.6 s D) every 5.1 s E) every 10 s
Identical 8.0-?C point charges are positioned on the x axis at x = ±1.0 m and released from rest simultaneously. What is the kinetic energy of either of the charges after it has moved 2.0 m?
a. 84 mJ b. 54 mJ c. 96 mJ d. 63 mJ e. 48 mJ
A spacecraft (mass = m) orbits a planet (mass = M) in a circular orbit (radius = R). What is the minimum energy required to send this spacecraft to a distant point in space where the gravitational force on the spacecraft by the planet is negligible?
a. GmM/(4R) b. GmM/R c. GmM/(2R) d. GmM/(3R) e. 2GmM/(5R)
The first experiment, which systematically demonstrated the equivalence of mechanical energy and heat, was performed by
a. Joule. b. Boltzmann. c. Thompson, Count Rumford. d. Kelvin.