The total amount of energy in the universe never changes, but the amount of energy available for work at any given moment varies tremendously What
best explains this change in available energy?
O A Energy can only be created through nuclear reactions
OB Energy is continually changing from one form into another.
O
C Energy is always transferred as heat.
OD. Energy is always converted with 100 percent efficiency
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The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.
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