A 1.0-kg aluminum ingot is heated from 0°C to 100°C. By what amount does its mass change? The specific heat of aluminum is 900 J/kg ? K. (c = 3.0 × 108 m/s)
A) Its mass does not change.
B) Its mass increases by 0.50 × 10-12 kg
C) Its mass decreases by 0.50 × 10-12 kg
D) Its mass increases by 1.0 × 10-12 kg
E) Its mass decreases by 1.0 × 10-12 kg
D
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Electric fields that arise from changing magnetic fields have all the properties below except:
A. They terminate on electric charges. B. They cannot be described by an electric potential. C. Their field lines take the form of closed loops. D. Work done by the field along a closed path may be non-zero.
A high-diver of mass 70.0 kg jumps off a board 10.0 m above the water. If, two seconds after entering the water, his downward motion is stopped, what average upward force did the water exert on him?
Fluorescent minerals on display in museums are illuminated with
A) infrared light. B) ultraviolet light. C) often either or both D) none of these
The blueness of the sky results from
a. preferential scattering of light by gas molecules. b. the lapse rate. c. the greenhouse effect. d. latent heat.