As a result of friction between internal parts of an isolated system
a. the total mechanical energy of the system increases.
b. the total mechanical energy of the system decreases.
c. the total mechanical energy of the system remains the same. d. the potential energy of the system increases but the kinetic energy remains the same. e. the kinetic energy of the system increases but the potential energy of the system remains the same.
B
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What is a quark?
A. a burst of radiation seen near black holes B. a very short wavelength radiation emitted by active galaxies C. a remote active galaxy D. a kind of subatomic particle that protons and neutrons are composed of E. None of these choices is correct.
Does Venus have auroras around its poles, like Earth? Why or why not?
A) Yes, because it is bombarded by charged particles from the Sun. B) No, because its atmosphere is too thick. C) Yes, because strong winds generate light near its poles. D) No, because it lacks a global magnetic field.
Most of Earth's seismic activity, volcanism, and mountain building occur along
A) convergent boundaries. B) divergent boundaries. C) plate boundaries. D) transform fault boundaries.
Two objects are dropped from a bridge, an interval of 1.0 s apart. Air resistance is negligible. During the time that both objects continue to fall, their separation
A) decreases. B) increases at first, but then stays constant. C) increases. D) stays constant. E) decreases at first, but then stays constant.