The bicycle wheel is spinning counterclockwise when viewed from above (so as you view the picture, the right hand side of the wheel is moving away from you). the man and stool are initially at rest. if the man now rotates the wheel’s axis 180˚ so that his right hand is above the wheel, the wheel/man/stool system will:

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

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 •  

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.