Two long conducting cylindrical shells are coaxial and have radii of 20 mm and 80 mm. the electric potential of the inner conductor, with respect to the outer conductor, is +600 v. an electron is released from rest at the surface of the outer conductor. what is the speed of the electron as it reaches the inner conductor? (e = 1.60 × 10-19 c, m el = 9.11 x 10-31 kg, k = 1/4π ε0 = 8.99 × 109 n · m2/c2)

Why do electron microscopes have higher resolving power than light microscopes?

A23 kg log of wood begins from rest, 300 m up a sluice (a water track used to transport logs, think of it as an inclined plane with negligible friction) inclined at 20° to the horizontal. after it reaches the flat waterway at the bottom it collides elastically with a 100 kg block of wood initially at rest near the base of the incline. (a) how long does it take the 23 kg log to travel down the incline? (b) what is the speed of the 23 kg log at the bottom of the incline? (c) what are the velocities of both blocks of wood after the collision? (d) what is the total kinetic energy before the collision? (e) what is the kinetic energy of the 23 kg log after the collision? (f) what is the kinetic energy of the 100 kg block of wood after the collision? (g) what is the total kinetic energy after the collision? (h) compare the total initial and total final kinetic energies. is this consistent with what you would expect for elastic collisions? explain!

From 0 to 5 seconds john pushed a box 5 meters. from 5 to 10 seconds, paul pushed the same box another 5 meters. who did more work? a. john b. paul c. john and paul did the same amount of work.