in the figure, a 4.0-kg ball is on the end of a 1.6-m rope that is fixed at 0. the ball is held at point a, with the rope horizontal, and is given an initial downward velocity. the ball moves through three quarters of a circle with no friction and arrives at b, with the rope barely under tension. the initial velocity of the ball, at point a, is closest to

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.

Which of the following are appropriate acceleration units?

What are the north and south poles of a solenoid change with?