The planet with the largest diameter is
a) Earth.
b) Jupiter.
c) Mars.
d) Neptune.
b
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A piece of iron sinks to the bottom of a lake where the pressure is 21 times what it is at the surface. Which statement best describes what happens to the density of that piece of iron?
A) Its density increases slightly. B) There has been no change in the density of the iron. C) Its density becomes 1/21 what it was at the surface. D) Its density decreases slightly. E) Its density becomes 21 times greater than what it was at the surface.
After a skydiver reaches terminal velocity,
A. the force of gravity no longer performs work on the skydiver. B. work performed by the force of gravity is converted into gravitational potential energy. C. gravitational potential energy is no longer available to the system of the skydiver plus the Earth. D. gravitational potential energy is converted into thermal energy. E. thermal energy is converted into gravitational potential energy.
The material that accretes onto a neutron star or black hole is expected to emit X-rays because
a. the material will produce synchrotron radiation.
b. hydrogen nuclei begin to fuse and emit high-energy photons.
c. the material will become hot enough that it will radiate most strongly at X-ray wavelengths.
d. as the material slows down it converts thermal energy to gravitational potential energy.
e. None of the other choices are correct.
X-rays from the Sun's corona
A) are absorbed in Earth's troposphere. B) are absorbed in Earth's thermosphere. C) cause meteor showers. D) break apart ozone in the stratosphere. E) generally reach Earth's surface.