Carnot Engine: One of the most efficient engines built so far has the following characteristics: The combustion chamber temperature is 1900°C, the exhaust temperature = 430°C, 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour. (1 cal = 4.186 J)(a) What is the actual efficiency of this engine?(b) What is the power output of this engine?(c) What would be the maximum possible efficiency for an engine using the same temperature extremes?
What will be an ideal response?
(a) 48% (b) 3.9 MW (c) 68%
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The temperature inside a Carnot refrigerator placed in a kitchen at 22.0°C is 2.0°C. The heat extracted from the refrigerator is 89 MJ/h. What power is needed to operate this refrigerator?
A) 1.7 kW B) 1.8 kW C) 1.5 kW D) 1.9 kW E) 1.6 kW
Suppose after reaching the bottom he then continues sliding up another icy slope on the other side of the valley. When he finally comes to a stop he will have reached a height
a. equal to the height he started from on the other hill b. less than the height he started from on the other hill c. more than the height he started from on the other hill d. none of the above
The halo stars in our Galaxy are bright, upper-main-sequence stars
Indicate whether the statement is true or false
A solid cylinder (I = MR2/2) has a string wrapped around it many times. When I release the cylinder, holding on to the string, the cylinder falls and spins as the string unwinds. What is the downward acceleration of the cylinder as it falls?
a. 0 c. 6.5 m/s2 b. 4.9 m/s2 d. 9.8 m/s2