During each cycle of operation, a refrigerator absorbs 230 J of energy from the freezer and expels 356 J of energy to the room. How much work input is required in each cycle?
A) 712 J
B) 586 J
C) 460 J
D) 126 J
D
Physics & Space Science
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The density of a neutron star is
a. about the same as that of a white dwarf. b. about the same as that of the Sun. c. about the same as an atomic nucleus. d. zero.
Physics & Space Science
Two identical freight cars roll without friction (one at 1 m/s, the other at 2 m/s) toward each other on a level track. They collide, couple together, and roll away in the direction of
A) the slower car. B) the faster car. C) neither, for they stop.
Physics & Space Science
How is dust usually observed around young protostars in stages 4-6?
What will be an ideal response?
Physics & Space Science
When a collision is perfectly inelastic, then:
a. all the kinetic energy is conserved. b. all the kinetic energy is gone. c. the participants stick together. d. the total momentum is zero.
Physics & Space Science