Hans full is pulling on a rope to drag his backpack to school across the ice. he pulls upwards with a force of 22.9 newtons at an angle of 35 degrees above the horizontal to drag his backpack a horizontal distance of 129 meters to the right. determine the work (in joules) done upon the backpack.

Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude f due to the other. with time, charge gradually leaks off of both spheres. when each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be

At what time would the magnitude of the velocity reach 36.00 km/hr

An electron moving at 5.06 103 m/s in a 1.23 t magnetic field experiences a magnetic force of 1.40 10-16 n. what angle does the velocity of the electron make with the magnetic field? there are two answers between 0° and 180°. (enter your answers from smallest to largest.)