Assess the coefficient of kinetic friction
A 18.5-kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 84.5 N and is directed at an angle of 30.0° above the horizontal. Determine the coefficient of kinetic friction.
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The load and the spring are taken down. Two people pull in opposite directions on the ends of the spring, each with a force of 190 N. Find the length of the spring in this situation.
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If electricity is valued at $0.08 per kW*h, what is the cost of the electrical input to the resistor for 20 min of operation?
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