Work, Energy, and Power (4A)
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QUESTION
State the work–kinetic energy theorem relating net work and change in kinetic energy.
QUESTION
What is the correct expression for efficiency in terms of input and useful output energy or work?
QUESTION
What is the formula for mechanical work done by a constant force at angle
θ
\theta
θ
to displacement?
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ANSWER
W
=
F
d
cos
θ
W = Fd\cos\theta
W
=
F
d
cos
θ
. Calculates work as the component of force parallel to displacement multiplied by distance, accounting for directionality.
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