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Question: A student pushed a box 27.0 m across a smooth, horizontal floor using a constant force of 113 N. If the force was applied for 9.00 s, how much power was developed, to the nearest watt?
The power developed can be found using the formula P = W/t, where P is power, W is work, and t is time. First, we need to calculate the work done. Work is defined as the force applied times the distance moved by that force, or W = Fd. So here, W = (113N)(27.0m) = 3051 Joules. To calculate power: P = W/t = 3051 Joules/9s = 339 Watts, rounded to the nearest watt.
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