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Q. A sledge loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope inclined at 20.1° above the horizontal. The sledge moves a distance of 20.3 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.500.

What is the mechanical energy lost due to friction?

Q. When a guitar string is sounded along with a 441-Hz tuning fork, a beat frequency of 4.00 Hz is heard. When the same string is sounded along with a 437-Hz tuning fork, the beat frequency is 8.00 Hz. What is the frequency of the string?

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