a mother lets her 25.0 kg child vertical distance of 5.00 m in 8.00 s. how much average power ance of 5.00 m in 8.00 s. How much average power does she exert?
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- DP-1 A 7.50kg box is pushed 1.70m along a frictionless horizontal table top by a constant force directed below as shown to the right. The work done by P is 25.0J. Find the angle 8 between the force P and the horizontal. P=20.0N Table top Ax 1.70m1 7.50kgA system of two paint buckets connected by a lightweight rope is released from rest with the 12.0-kg bucket 2.50 m above the floor as shown in the Figure. Use the principle of conservation of energy to find the speed with which this bucket strikes the floor. Ignore friction and the mass of the pulley a) 4.43 m/s c) 4.95 m/s e) None. 12.0 kg 1. 2.5 m 6.0 kg b) 5.42 m/s d) 4.04 m s1. You push a 67 kg box across a floor where the coefficient of kinetic friction is uk = 0.55. The force you exert is horizontal.(a) How much power is needed to push the box at a speed of 0.50 m/s?(b) How much work do you do if you push the box for 35s? Explain and draws.
- An object is placed to a shelf from the ground which is 1.8 m higher. find out how much work is done by you. If the same object falls to the ground, how much work is done by gravity? Mass of the object is 200 g.Yosemite Falls in California is about 0.740 km high. What average power would it take for a 73.0-kg person to hike up to the top of Yosemite Falls in 1.50 h?Suppose a pneumatic air rifle can accelerate a 3.0-g paintball from zero to 280 ft/s over a barrel length of 23 in. Calculate the average amount of power ? delivered to the paintball when fired. ?= W