A 5,400 W motor is used to do work. If the motor is used for 640 s, about how much work could it do? 8.4 J
4,800 J
6,000 J
3,500,000 J

Atransverse wave is traveling on a string stretched along the horizontal x-axis. the equation for the vertical displacement y of the string is given by y = (1.8 x 10-3)cos[π(13x - 60t)], where all quantities are in si units. what is the maximum speed of a particle of the string

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?