First Law of Thermodynamics: The work done on an ideal gas system in an isothermal process is -400 J. What is the change in internal (thermal) energy of the gas?
A. 0 J
B. -400 J
C. 400 J
D. 200 J
Answer: A
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An aluminum bar (E 5 70 GPa, ? 5 0.33) of diameter 20 mm is stretched by axial forces P, causing its diameter to decrease by 0.022 mm. The load P is approximately:
(A) 73 kN
(B) 100 kN
(C) 140 kN
(D) 339 kN
A 2.5-kg box, sliding on a rough horizontal surface, has a speed of 1.2 m/s when it makes contact with a spring (see the figure)
The block comes to a momentary halt when the compression of the spring is 5.0 cm. The work done by the friction, from the instant the block makes contact with the spring until is comes to a momentary halt, is -0.50 J. (a) What is the spring constant of the spring? (b) What is the coefficient of kinetic friction between the box and the rough surface? What will be an ideal response?
For lunar tides to occur in the human body
A) most of the body would have to be in the liquid state. B) Earth's gravitation would have to be incredibly small. C) parts of the body would have to be appreciably closer to the Moon than other parts. D) none of the above
A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into a room per cycle. How much work is required in each cycle?
A) 4 kJ B) 20 kJ C) 22 kJ D) 24 kJ E) 44 kJ