# Physics - Work-Energy Theorem

A 700kg glider is flying in straight and level flight at 90 m/s. What is the initial kinetic energy of the glider and if the pilot decides to trade airspeed for altitude how much alitude can the pilot gain while slowing the glider to 25 m/s? (Neglect loss of energy due to air friction)

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(a) KE = (1/2)m(v^2) = (1/2)(700)(90^2) = 2835000 J.

(b) Final ...

#### Solution Summary

The expert examines work-energy theorem. Neat, complete and step-by-step solutions are provided.

Physics - Work-Energy Theorem

A 70 kg person uses 204.0 kJ of energy to walk a kilometer. This energy comes from "burning" glucose, but only about 30.0% of the heat of combustion of glucose can be used for propulsion. The rest is used for other body functions or is wasted as heat. Assuming that a sugar-coated cereal contains 30.0% sugar (which can be considered glucose) and no other energy source, what mass of cereal will provide enough energy to walk 0.5 km.

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