Deduce that the power required to maintain constant speed
A constant force of magnitude F moves an object at constant speed v in the direction of the force. Deduce that the power P required to maintain constant speed is given by the express P = Fv.
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Two lifeguards pull on ropes attached to a raft. If they pull in the same direction, the raft experiences a net external force of 320 N to the right. If they pull in opposite directions, the raft experiences a net external force of 109 N to the l
A small ball of mass 81 g is suspended from a string of length 26 cm and whirled in a circle lying in the horizontal plane. If the string makes an angle of 23? with the vertical, find the centripetal force experienced by the ball. The acceleratio
A fully loaded Volvo station wagon has a mass of 2000 kg. If each of its four tires is inflated to a gauge pressure of 215 kPa, what is the total tire area in contact with the road?
How much heat is required to vaporize a(n) 2 g ice cube initially at 0?C? The latent heat of fusion of ice is 80 cal/g and the latent heat of vaporization of water is 540 cal/g. The specific heat of water is 1 cal/(g · ? C) .
The wind exerts a force of 239 N North on a sailboat, while the water exerts a force of 167 N West on the sailboat. What is the magnitude of the net external force on the sailboat?
A ferris wheel with a radius of 8.0 m rotates at a constant rate, completing one revolution in 30.0 s. what is the apparent wight of a 60.0-kg passenger when she is at the top of the wheel?
A 108 kg water skier floating in a lake is pulled from rest to a speed of 11 m/s in a distance of 25 m. What is the net force exerted on the skier, assuming his acceleration is constant?
A spring with k = 45 N/m hangs vertically next to a ruler. The end of the spring is next to the 15 cm mark on the ruler. If a 2.7 kg mass is now attached to the end of the spring, where will the end of the spring line up with the ruler marks?
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