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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It will launch him in the air and he wants to come down so he just misses the last of a number of 1.00 m diameter barrels. If the speed at the instant when he leaves the ramp is 60.0 m/s, how many barrels can be used?
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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