Posted by justin on Wednesday, July 3, 2013 at 5:43pm.
At a carnival, you can try to ring a bell by striking a target with a 11.6kg hammer. In response, a 0.413kg metal piece is sent upward toward the bell, which is 4.22 m above. Suppose that 26.2 percent of the hammer's kinetic energy is used to do the work of sending the metal piece upward. How fast must the hammer be moving when it strikes the target so that the bell just barely rings?

physics  Elena, Thursday, July 4, 2013 at 3:57am
0.262KE=PE
0.262m₁v²/2 = m₂gh
v=sqrt{2m₂gh/0.262m)=
=sqrt{2•0.413•9.8•4.22/0.262•11.6} =
=3.35 m/s