A man uses a single movable pulley to lift a heavy load with a frictionless rope.

Which of the following pulley systems have/has a greater mechanical advantage than the one shown above?

W.
X.
Y.
Z.

Pulleys at the top of the rope are fixed.
A.
Y, W, and X
B.
Y only
C.
Z only
D.
Z and X

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the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.