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

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

Which best describes how fluids change as they travel through different portions of the convection currents? they change to solids at the outer portion of the convection currents. they change to solids at the inner portion of the convection currents. they become more dense at the outer portion of the convection currents. they become more dense at the inner portion of the convection currents

Which atomic model was proposed as a result of j. j. thomson’s work?