The energy of position is called
a. potential energy.
b. power.
c. kinetic energy.
d. heat.
a
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In years of heavy snow pack in the mountains it is sometimes desirable to induce early melting of the snow, rather than wait until it all melts suddenly and causes floods
It has been suggested that a way to accomplish this might be to have planes fly over the snow fields and sprinkle them with black soot. What do you think of this idea? Would it work? A) Yes, it would probably work because the black surface would be a better absorber of sunlight than would the white snow. B) Yes, it would work because the soot would raise the melting point of the snow. C) Yes, it would work because the soot would decrease the specific heat capacity of the snow. D) No, it would not work because it is infrared radiation and not visible radiation which melts the snow. E) No, it would not work because sunlight has very little effect on how fast the snow melts.
Two charged objects attract each other with a certain force. If the charges on both objects are doubled with no change in separation, the force between them
A) becomes zero. B) doubles. C) halves. D) quadruples. E) increases, but we can't say how much without knowing the distance between them.
The element symbol C stands for cobalt
Indicate whether the statement is true or false
If the longest wavelength of light that is able to dislodge electrons from a metal is 373 nm, what is the work function of that metal, in electron-volts?
(1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)