A girl consumes 8.4 x 106J (2000 food calories) of energy per day while maintaining a constant weight. What is the average power she produces in a day?
Answer to relevant QuestionsA 1500-kg race car can go from 0 to 90 km/h in 5.0 s. What average power is required to do this? Water is lifted out of a well 30.0 m deep by a motor rated at 1.00 hp. Assuming 90% efficiency, how many kilograms of water can be lifted in 1 min? A 200-g ball is launched from a height of 20.0 m above a lake. Its launch angle is 40o and it has an initial kinetic energy of 90.0 J. (a) Use energy methods to determine its maximum height above the lake surface. (b) Use ...Since K = p2/2m, how can kinetic energy be lost in an inelastic collision while the total momentum is still con-served? Explain. When jumping from a height to the ground, it is advised to land with the legs bent rather than stiff- legged. Why is this?
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