An object moves 100 m along a frictionless table at a constant speed. The object weighs 50 N. The work done on the object by the gravitational force is
a. 0 J.
b. 2 J.
c. 50 J.
d. 100 J.
e. 5000 J.
A
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Four 16-?F capacitors are connected in combination. What is the equivalent capacitance of this combination if they are connected
(a) in series? (b) in parallel? (c) such that two of them are in parallel with each other and that combination is in series with the remaining two capacitors?
Explain why, in terms of photons, ultraviolet light can damage cells in your skin but visible light cannot
A) Ultraviolet photons have a smaller uncertainty in position. B) Ultraviolet photons have more energy. C) Ultraviolet photons move faster. D) Ultraviolet photons have a smaller uncertainty in energy. E) Ultraviolet photons have a longer wavelength.
The most information about our environment comes to us through the sense of
a. smell. b. sight. c. hearing. d. touch.
Is it possible to have a macroscopic sample of oxygen that has a mass of 14 atomic mass units?
A) Yes, but it would need to be made of oxygen atoms that each had less than the normal number of neutrons. B) No, this is less than than the mass of a single oxygen atom. C) Yes, but it would have the same density as nitrogen. D) No, because oxygen is a gas at room temperature.