The energy per unit charge supplied by a battery is its
a. voltage.
b. current.
c. resistance.
d. electric field.
e. critical temperature.
a
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On a Hertzsprung-Russell diagram, where would we find white dwarfs?
A) upper right B) lower right C) upper left D) lower left
How much energy is needed to power a 100-watt light bulb for 1 second?
A) 6000 joules B) 100 joules C) 1 joule D) 100 watts E) 6000 watts
If the mass of the earth and all objects on it were suddenly doubled, but the size remained the same, the acceleration due to gravity at the surface would become
A) 4 times what it now is. B) 1/4 of what it now is. C) 2 times what it now is. D) the same as it now is. E) 1/2 of what it now is.
Twenty grams of a solid at 70°C is place in 100 grams of a fluid at 20°C. Thermal equilibrium is reached at 30°C. The specific heat of the solid:
a. is equal to that of the fluid. b. is less than that of the fluid. c. is more than that of the fluid. d. cannot be compared to that of a material in a different phase.