A fluid in an insulated, flexible bottle is heated by a high resistance wire and expands
If of thermal energy is transferred through heating to the system and it - of work is done on it, how much does the internal (thermal) energy of the fluid change? A) 4.0 kJ
B) 14 kJ
C) -4.0 kJ
D) 45 kJ
A
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Which is a reason that we know dark energy is a major componentof the universe?
a) The universe would not be 2.7 degrees Kelvin today without dark energy. b) The gravity due to regular matter in the universe would have started it contractingagain by now without dark energy. c) Supernovae would not occur without dark energy. d) Dark energy is needed in order that light can escape from supermassive black holes. e) The universe is flat and regular matter doesn't contribute enough energy density.
A steady horizontal force lasting for 2.10 s gives a 1.25 kg object an acceleration of 3.20 m/s2 on a frictionless table. What impulse does this force give to the object?
A) 25.7 kg m/s B) 10.9 kg m/s C) 8.40 kg m/s D) 4.00 kg m/s E) 2.63 kg m/s
Two ropes are attached to a 40-kg object. The first rope applies a force of 50 N and the second, 40 N. If the two ropes are perpendicular to each other, what is the resultant magnitude of the acceleration of the object?
a. 1.2 m/s2 c. 25 m/s2 b. 1.6 m/s2 d. 47 m/s2
When a fixed amount of ideal gas goes through an adiabatic expansion
A) its internal (thermal) energy does not change. B) the gas does no work. C) no heat enters or leaves the gas. D) its temperature cannot change. E) its pressure must increase.