In the first law of thermodynamics
the variables Q and W stand for
A. the heat flow out of the system and the work done on the system.
B. the heat flow out of the system and the work done by the system.
C. the heat flow into the system and the work done by the system.
D. the heat flow into the system and the work done on the system.
D. the heat flow into the system and the work done on the system.
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Interference of light is evidence supporting
A) the wave theory of light. B) the wave theory except in the case of constructive interference. C) both the particle and wave theories of light. D) the particle theory of light. E) the wave theory except in the case of destructive interference.
The total force needed to drag a box at constant speed across a surface with coefficient of kinetic friction mk is least when the force is applied at an angle q such that
a. sinq = mk. b. cosq = mk. c. tanq = mk. d. cotq = mk. e. secq = mk.
You throw a Frisbee of mass m and radius r so that it is spinning about a horizontal axis perpendicular to the plane of the Frisbee. Ignoring air resistance, the torque exerted about its center of mass by gravity is
a. 0. b. mgr. c. 2mgr. d. a function of the angular velocity. e. small at first, then increasing as the Frisbee loses the torque given it by your hand.
Almost all the helium in the universe was formed between 2-15 minutes after the Big Bang
Indicate whether the statement is true or false