A white dwarf star is about the size of
A) the sun.
B) a highway truck.
C) the head of a pin.
D) Earth.
E) Actually, it doesn't have any size at all.
D
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Energy conservation tells us that the energy of a system can change via
A. Heat transfer B. The energy of a system cannot change C. Work done and/or heat transfer D. Work done on or by the system
The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a distance of 12.0 cm, what is its maximum speed when the engine is running at 3000 rpm?
a. 4.71 m/s c. 44.0m/s b. 9.42 m/s d. 22.0 m/s
The Early Bird communication satellite hovers over the same point on Earth's equator indefinitely, because
A) other forces than Earth's gravity act on it. B) it pulls as hard on Earth as Earth pulls on it. C) it is beyond the main pull of Earth gravity. D) it is kept aloft by ground control. E) its orbital period is 24 hours.
If you had something the size of a sugar cube that was made of white dwarf matter, it would weigh
A) as much as a truck. B) about 5 pounds. C) as much as the entire Earth. D) as much as an average person.