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

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.

Z only

B.

W and Y

C.

W only

D.

W and X

Answer-

W only

Explanation-

Fixed pulleys do not change the mechanical advantage of a system. Movable pulleys that increase the number of sections of rope that bear the weight of the load increase the mechanical advantage of the system. The top image has one movable pulley. Only system W has more than one movable pulley—it has two.

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.