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
Answer: D
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For this situation, I push on a heavy chair.Suppose I push lightly on the chair, and the chair doesn't move at all. Then the strength of the force the chair exerts on me is
a. less than the force I exert on the chair. b. equal to the force I exert on the chair. c. greater than the force I exert on the chair. d. zero.
The Milky Way Galaxy
a. contains about 100 billion stars. b. is about 200 light-years in diameter. c. is the largest known object in the universe. d. all of the above e. a and c
An electric car runs off a battery. When the driver wants to slow down the car, instead of applying the brakes he or she throws a switch that connects the wheels to a generator that converts the car’s kinetic energy back to energy in the battery.
A. first kind B. second kind
The deepest point of the Pacific Ocean is 11,033 m, in the Mariana Trench. What is the gauge pressure in the water at that point? The density of seawater is 1025 kg/m3
A) 5.55 × 107 Pa B) 8.88 × 107 Pa C) 1.11 × 108 Pa D) 2.22 × 108 Pa E) 3.33 × 108 Pa