You throw a ball straight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down
A) Work up is -, and the work down is -.
B) Work up is +, and the work down is +.
C) Work up is -, and the work down is +.
D) Work up is +, and the work down is -.
C
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A barge with vertical sides is 10.0 m wide and 60.0 m long and is floating in fresh water. How much deeper into the water does the barge sink when 300,000 kg of coal are loaded on the barge?
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Fill in the blank(s) with correct word
A refrigerator uses 40.0 J of work to extract heat from a heat reservoir at If the coefficient of performance of the refrigerator is 2.10, then how much heat is discharged out of the refrigerator at a higher temperature?
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