A _________ is an electrochemical cell that consumes a fuel and directly produces electrical energy.
Fill in the blank(s) with the appropriate word(s).
fuel cell
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A billiard ball collides in an elastic head-on collision with a second stationary identical ball. After the collision which of the following conditions applies to the first ball?
a. maintains the same velocity as before b. has one half its initial velocity c. comes to rest d. moves in the opposite direction
Using an orbit size of 8 kpc, and a period of 225 million years, the mass of our Galaxy is found to be closest to
A) 106 solar masses. B) 108 solar masses. C) 1010 solar masses. D) 1011 solar masses. E) 1012 solar masses.
In the light curve of a nova, the rise to maximum luminosity takes only a few ________
Fill in the blank(s) with correct word
In grinding a steel knife blade (specific heat = 0.11 cal/g-C°), the metal can get as hot as 400.°C. If the blade has a mass of 80. g,
what is the minimum amount of water needed at 20°C if the water is not to rise above the boiling point when the hot blade is quenched in it?