A steam engine is operating at its theoretical maximum efficiency of 60%. If the waste heat has a temperature of 100°F (38°C), what is the temperature of the boiler?
a. 350°C
b. 94°C
c. 225°C
d. 504°C
e. 775°C
D
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Which of the following is not a unit of pressure?
a. atmosphere b. psi c. N/m2 d. mm of mercury e. pascal f. none of the above Indicate whether the statement is true or false
An inductor produces a back emf in a DC series RL circuit when a switch connecting the battery to the circuit is closed. We can explain this by
A. Lenz's law. B. increasing magnetic flux within the coils of the inductor. C. increasing current in the coils of the inductor. D. all of the above. E. only (a) and (c) above.
An iron ball and wooden ball of the same size are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater
A) speed. B) acceleration. C) momentum. D) all of the above E) none of the above
A cheetah can maintain its maximum speed of 96.0 km/hr for 26.0 seconds. What minimum distance must a gazelle running 85.0 km/hr be ahead of the cheetah to escape?
a. 96 m b. 79 m c. 40 m d. 73 m e. 67 m