Carly is investigating the effects of heat transfer on molecular motion. She pours cold water into a beaker, places the beaker on top of a heat source, and turns on the heat. Her set up is shown. Identify and describe the method of heat transfer that Carly is investigating. Describe the effect of the heat transfer on the motion of the water molecules at the top and the bottom of the beaker.

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?

A1.5m wire carries a 2 a current when a potential difference of 52 v is applied. what is the resistance of the wire?

16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.