A heat engine exhausts 4000 J of heat while performing 2000 J of useful work. What is the efficiency of the engine?
a. 15%
c. 40%
b. 33%
d. 60%
B
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An object travels 7.5 m/s toward the West and under the influence of a constant net force of 5.2 kN, 4.3 s later, it is travelling 2.5 m/s toward the East. What is its mass?
A. 2200 kg B. 4500 kg C. 6000 kg D. 12000 kg
When a neutral atom loses an electron, we say that it becomes
A) vaporized. B) dissociate. C) ionized. D) an isotope. E) a plasma.
Analysis of volcanic emissions suggests that eruptions could be the source of all but which of the following gases in our atmosphere?
A. nitrogen B. carbon dioxide C. water D. oxygen
A train starts from rest and accelerates uniformly until it has traveled 2.1 km and acquired a forward velocity of The train then moves at a constant velocity of for 400 s. The train then slows down uniformly at until it is brought to a halt
The distance traveled by the train while slowing down is closest to A) 4.4 km. B) 4.2 km. C) 4.0 km. D) 3.8 km. E) 3.6 km.