A boulder with a mass of 25 kilograms slides 30 meters to the right white experiencing sight force of 150 newtons and a leftward force of friction that is two thirds the magnitude of the force 1. Calculate the magnitude of work done by the force of friction A. O joules B. 1500 joules C 3000 joules D. 4500 joules It takes the boulder 5.48 seconds to travel 30 meters 2. Calculate the power required to move the boulder 30 meters. A. 273.7 watts B. 547.4 watts C. 1500 watts D. 3000 watts​

To understand the behavior of the electric field at the surface of a conductor, and its relationship to surface charge on the conductor. a conductor is placed in an external electrostatic field. the external field is uniform before the conductor is placed within it. the conductor is completely isolated from any source of current or charge. part a: which of the following describes the electric field inside this conductor? it is in the same direction as the original external field. it is in the opposite direction from that of the original external field. it has a direction determined entirely by the charge on its surface. it is always zero. part b: the charge density inside the conductor is: 0non-zero; but uniformnon-zero; non-uniforminfinite part c: assume that at some point just outside the surface of the conductor, the electric field has magnitude e and is directed toward the surface of the conductor. what is the charge density η on the surface of the conductor at that point? express your answer in terms of e and ϵ0