Which answer below is not a statement of the second law of thermodynamics?
a. Real processes proceed in a preferred direction.
b. Energy does not flow spontaneously by heat from a cold to a hot reservoir.
c. The entropy of the universe increases in all natural processes.
d. In theory, heat engines working in a cycle employ reversible processes.
e. You cannot construct a heat engine, operating in a cycle that does nothing but take heat from a reservoir and perform an equal amount of work.
D
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If you pound a feather with a hammer, which one feels a greater force?
A) always the feather B) always the hammer C) The size of the force is always exactly the same on both of them. D) If the feather moves, then it felt the greater force. Otherwise the force was the same on both.
The fundamental unit of the silicon-oxygen minerals is in the shape of a
a. cone. b. tetrahedron. c. cube. d. sphere.
A hammer is thrown upward with a speed of 14 m/s on the surface of planet X where the acceleration of object in free fall is 3.5 m/s2 and there is no atmosphere. What is the speed of the hammer after 8.0 s?
A) 7.0 m/s B) 14 m/s C) 21 m/s D) 64 m/s
What is the kinetic energy of a 0.160-kg ball thrown at 40.0 m/s (90.0 mph)?
a. 54.0 J b. 64.0 J c. 108 J d. 128 J e.newton-meter.