One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C; exhaust temperature = 430°C. 7 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour
(a) What is the actual efficiency of this engine?
(b) What is the Carnot efficiency of this engine?
(a) 48%
(b) 68%
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At the ultimate tensile strength,
(a) The true stress is at its maximum. (b) The specimen always fractures. (c) The maximum load-carrying capacity is experienced. (d) The material yields.
What is the ecliptic?
A) the path the Sun appears to trace around the celestial sphere each year B) the Sun's daily path from east to west in our sky C) the path traced by the Moon's shadow on Earth during a solar eclipse D) a half-circle extending from your horizon due north, through your zenith, to your horizon due south
A car starts from rest and accelerates uniformly at 3.0 m/s2 toward the north. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at 5.0 m/s2 toward the north
How long after the second car starts does it overtake the first car? A) 12 s B) 19 s C) 21 s D) 24 s
A thermostat can work because of a bimetallic strip
a. True b. False Indicate whether the statement is true or false