Asystem of pulleys is used to raise a load of bricks that weighs 1,700 newtons. the force applied to the pulley is 340 newtons. what’s the mechanical advantage of this machine?

Akg a of 55 m at an of 11 ? . if is at 98 km/h,be ?

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.