Match each scenario to the energy transformation it represents.
a ball dropped
from a height
sunlight falling on
solar panels
a person talking into
a microphone
sound energy to
electric energy
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radiant energy to
electric energy
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gravitational potential
energy to motion energy
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Which statement best describes how private industry decides where to spend the money on research and development

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?