25. Two True/False (T/F) statements are underlined below. Select T or F in the same order as the statements. $ A solid spherical electrical conductor has a net charge of -2 C and all charges remain at rest. *The -2 C charge must be uniformly distributed on the surface of the sphere. A solid conducting sphere has a net charge of -3C and a potential of -6V at its surface. All charges remain at rest. * The electric field at a point midway between surface and center cannot be zero. a) T/F b) T/T c) F/T d) F/F

Problem 4: Speed deamplifier. In the figure above on the right, block 1 of mass m1 slides along an x-axis on a frictionless floor at speed 4 m/sec.Then it undergoes a one-dimensional elastic collision with stationary block 2 of mass m2 = 2m1. Next, block 2 undergoes a one-dimensional elastic collision with stationary block 3 of mass mz = 4m1. What then is the speed of block 3? Answer: 16 m/sec or 1.78 m/sec.