#4. A uniform, 250 N pipe is used as a lever. Where must be the fulcrum be placed from 600 N. If a 600 N weight at one end and is to balance a 150 N weight at the other end? (The length of pipe is 2 m)
#5. A force applied to a 50 kg box on a level floor is just enough to start it moving. The coefficients of static and kinetic friction are respectively 0.5 and 0.3. If the same force continues to applied to the box, its will have an acceleration of approximately?
#8. A baseball (m=0.14 kg) has an initial velocity -38 m/s and the ball depart from the bat with final velocity 58 m/s. The contact time between the bat and ball is 4 x 10 s. Find the average force exerted on the ball by the bat.