we know that
Power efficiency is defined as the ratio of the output power divided by the input power:
so
in this problem
Substitute in the formula above
%
therefore
the answer is
the efficient is %
Describe an instance when the motion energy of an object changed, causing some other energy change as well.
1 answer:
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Answer:
coasting down hill on a bicycle
Explanation:
Coasting down the hill on a bicycle is a typical example of how kinetic energy is being transformed to potential energy in a system.
Kinetic energy is the energy due to the motion of a body, it can be derived using the expression below;
K.E = m v²
Potential energy is the energy due to the position of a body. It can be derived using;
P.E = mgh
m is the mass
v is the velocity
g is the acceleration due to gravity
h is the height
Now, at the top of the hill, the potential energy is at the maximum. As the bicycle coasts down the potential energy is converted to kinetic energy.