Thermodynamic Devices: During each cycle, a refrigerator removes 20.0 kJ of heat from the freezing compartment and ejects 24.0 kJ into a room.(a) How much work per cycle is required each cycle to run this refrigerator?(b) What is the coefficient of performance of this refrigerator?
Fill in the blank(s) with the appropriate word(s).
(a) 4.0 kJ (b) 5.0
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Free Fall: A foul ball is hit straight up into the air with a speed of 30 m/s, and air resistance is negligible.(a) Calculate the time required for the ball to rise to its maximum height.(b) Calculate the maximum height reached by the ball above the point where it hit the bat.(c) Determine the times at which the ball passes a point 25 m above the point where it was hit by the bat.(d) Explain why there are two answers to part (c).
What will be an ideal response?
Neutral hydrogen can be detected because its electron occasionally ________ its spin and creates the 21-cm emission line for radio observers
Fill in the blank(s) with correct word
Conversion of Units: The king's chamber of the great pyramid in Egypt is 10.43 m long, 5.21 m wide, and 5.82 m high. What is the volume of the chamber in cubic feet, expressed to the correct number of significant figures? (1.00 in. = 2.54 cm)
A. 316 ft3 B. 3720 ft3 C. 6530 ft3 D. 11,200 ft3 E. 13,200 ft3
A 2000 kg car accelerates up to a velocity of 40 m/s in 5.0 seconds. The brakes are applied, and the car is brought to a stop. The work done by the friction in the brakes is
A. 
B. 
C. 
D. 
E. 