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.

11. you want to calculate the displacement of an object thrown over a bridge. using -10 m/s2 for acceleration due to gravity, what would be the total displacement of the object if it took 8 seconds before hitting the water?

Aplane takes off from an airport and flies to town a, located d1 = 215 km from the airport in the direction 20.0° north of east. the plane then flies to town b, located d2 = 230 km at 30.0° west of north from town a. use graphical methods to determine the distance and direction from town b to the airport. (enter the distance in km and the direction in degrees south of west.)

Which transition by an electron will release the greatest amount of energy? oa ob oc od