A student attaches a rope to a 20.0 Kg box of books. He pulls with a force of 90.0 N at an angle of 30.0 o with the horizontal. The coefficient of Kinetic friction between the box and the sidewalk is 0.500. Find the acceleration of the box.

1-10. need . physics. circular motion. 35 points

Initially, a particle is moving at 5.33 m/s at an angle of 37.9° above the horizontal. two seconds later, its velocity is 6.11 m/s at an angle of 54.2° below the horizontal. what was the particle's average acceleration during these 2.00 seconds in the x-direction (enter first) and the y-direction?

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?