physics - kinetic energy
A bicycle and a rider together have a mass of 7.40 slugs. If the kinetic energy is 742 ft lb, find the velocity (ft/s).
I've been trying to do this problem all day!! And I still can't get the right answer!!
2007-07-16 12:37:14 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Physics
nyphdinmd -
ur answer matches the answer in the back of the book?
but how does ft lb/slugs convert to ft/second without affecting the number?
2007-07-16 12:51:14 · update #1
ke = 1/2 mv^2
v = sqrt(2*ke/m) = sqrt(2*742/7.4) = 14.14 ft/s
2007-07-16 12:41:43 · answer #1 · answered by nyphdinmd 7 · 0⤊ 1⤋
kinetic energy = 1/2 mass*(velocity)^
transpose for v
k=1/2mv^
2k=mv^
2k/m=v^
v=squareroot(2k/m)
velocity = squareroot of 2*kenetic energy/mass
velocity=squareroot(2*742/7.40)
velocity=squareroot(200.54054.......)
velocity=14.14ft/s
2007-07-16 15:12:52 · answer #2 · answered by johnny 3 · 0⤊ 0⤋