Find the work he did in pushing forward on his wheels

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Reference no: EM1313250

Q1. A boy in a wheelchair (total mass, 47.0 kg) wins a race with a skateboarder. He has a speed of 1.47 m/s at the crest of a slope 2.60m high and 12.4 m long. At the bottom of the slope, his speed is 6.20 m/s. If air resistance and rolling resistance can be modelled as a constant frictional force of 41.8 N, find the work he did in pushing forward on his wheels during the downhill ride.

Q2. How many J of energy must be removed when 156 g of steam, at a temperature of 175.0 °C, is cooled and frozen into 156 g of ice at 0 °C?

Reference no: EM1313250

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