Spring scale A is attached to the floor and a rope runs vertically upward, loops over an ideal pulley, and runs down on the other side to a 281-N weight. Scale B is attached to the ceiling and the pulley is hung below it. Ignore the weights of the rope, pulley, and scales.

Unpolarized light whose intensity is 1.19 w/ is incident on a polarizer. (a) what is the intensity of the light leaving the polarizer? (b) if the analyzer is set at an angle of = 41.0∘ with respect to the polarizer, what is the intensity of the light that reaches the photocell?

What are atoms of the same element with varying number of neutrons

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?