Which of the numbers 0.1, 1.0, and 2.0 represent possible values for the COP of a heat pump?
1.0.1 only
2.1.0 only
3.2.0 only
4.all of these.
4
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An object is moving with constant non-zero velocity on the +x axis. The velocity versus time graph of this object is
A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve. E) a hyperbolic curve.
A barge with vertical sides is 10 m wide and 60 m long and is floating in fresh water of density 1000 kg/m3. How much deeper into the water does the barge sink when 3.0 x 105 kg of coal are loaded on the barge?
A) 25 cm B) 50 cm C) 75 cm D) 1.0 m E) 1.5 m
According to our present theory of solar system formation, which of the following best explains why the solar nebula ended up with a disk shape as it collapsed?
A) The force of gravity pulled the material downward into a flat disk. B) The law of conservation of energy C) It was fairly flat to begin with, and retained this flat shape as it collapsed. D) It flattened as a natural consequence of collisions between particles in the nebula.
The specific of ice is 2.10 kJ/kg
the heat of fusion for ice at 0
is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg
and the heat of vaporization of water at 100
is 2,256 kJ/kg. What is the final equilibrium temperature when 5.00 grams of ice at -15.0
is mixed with 40.0 grams of water at 75.0
?
A. 30.1
B. 28.3
C. 20.9
D. 18.6
E. 16.1