A certain automobile engine takes in 4.00 kJ of heat and performs 1.10 kJ of mechanical work in each cycle
(a) Calculate the engine's efficiency.
(b) How much heat is "wasted" in each cycle?
What will be an ideal response?
(a) 27.5% (b) 2.90 kJ
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At least 70% of stars have planets. How many planets can astronomers reasonably claim exist in the Milky Way galaxy?
A) at least 70 billion B) at least 1 trillion C) at least 8 D) at least 3000
The mass of a high speed train is 4.5×105kg, and it is traveling forward at a velocity of 8.3×101m/s. Given that momentum equals mass times velocity, determine the values of m and n when the momentum of the train (in kg?m/s) is written in scientific notation.?
Most of the world's water is in
A) icecaps. B) glaciers. C) rivers and lakes. D) the oceans.
According to the theory of cosmic inflation, at what time in the history of the universe did inflation occur?
A) at the very beginning of the big bang B) at the time that the cosmic background radiation formed C) around the third or fourth minute D) around the third or fourth second E) at a tiny fraction of the first second, but not quite at the very beginning of the big bang