A recreational motor boat on a lake is towing a 70-kg water skier. She holds on to a nylon tow rope of length 12 m with a cross sectional area of 2.0 10-5 m2. As the boat and she starts moving, she is subjected to a horizontal drag force of 125 N from the water. If she moves with an acceleration of 0.85 m/s2, by how much does the rope stretch? Young's modulus for nylon is 3.7 109 N/m2.

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Arowboat passenger uses an oar to push the boat off the dock by exerting a force of 40n for 3.0s. what impulse acts on the boat.

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.