The slope of the acceleration-time curve represents:
a. the velocity.
b. the rate of change of acceleration.
c. the rate of change of displacement.
d. the area under the position vs. time curve.
B
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Which of the following statements about ozone (in Earth's stratosphere) is not true?
A) The presence of ozone was crucial to the origin of life. B) If the ozone layer is depleted, we can expect the rate of mutations in land-based life-forms to increase significantly. C) Ozone absorbs ultraviolet light from the Sun. D) The ozone hole occurring each spring over Antarctica appears to be caused by human-made CFCs.
A solid uniform sphere of mass 1.85 kg and diameter 45.0 cm spins about an axle through its center. Starting with an angular velocity of 2.40 rev/s, it stops after turning through 18.2 rev with uniform acceleration
The net torque acting on this sphere as it is slowing down is closest to A) 0.00593 N ? m. B) 0.0372 N ? m. C) 0.0466 N ? m. D) 0.0620 N ? m. E) 0.149 N ? m.
The light radiated from the Sun's surface reaches Earth in about 8 minutes, but the energy of that light was released by fusion in the solar core about
A) a few hundred thousand years ago. B) 3 days ago. C) 100 years ago. D) 1,000 years ago.
An object more massive than the Sun, but roughly the size of a city, is a:
A) supernova remnant. B) white dwarf. C) brown dwarf. D) neutron star. E) red dwarf.