The net force acting on a 6.0-kg object is given by Fx = (12 – x) N, where Fx is in newtons and x is in meters. How much work is done on the object as it moves from x = 0 to x = 12 m?
a. 120 J
b. 72 J
c. 36 J
d. 18 J
B
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A vessel containing 5.0 kg of water at 10°C is put into a refrigerator. The 1/7 HP motor (1 HP = 746 W) runs for 5.0 minutes to cool the liquid to the refrigerator's low temperature, 0°C. What is the COP of the refrigerator?
a. 5.7 b. 4.6 c. 6.5 d. 7.2 e. 3.6
A counterflow double pipe-heat exchanger is used to heat 0.8 kg/s of water from 40ºC to 80ºC with oil having specific heat of 2.1 kJ/kg?K. Assume the maximum oil flow can be 1.0 kg/s and that oil enters the heat exchanger at 170ºC. If the overall heat transfer coefficient is 425 W/m^2?K, determine the surface area of the heat exchanger and the effectiveness of the heat exchanger. Equation 9-29 defines the effectiveness.
What will be an ideal response?
Energy in Capacitors: When a 12.0-V battery causes 2.00 ?C of charge to flow onto the plates of an air-filled capacitor, how much work did the battery do?
A. 24.0 ?J B. 12.0 ?J C. 144 ?J D. 576 J
As the illuminated part of the Moon grows larger from new to full, it is said to "wane"
a. True b. False Indicate whether the statement is true or false