Homework Help: physics

Posted by John on Tuesday, October 23, 2012 at 5:15pm.

A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, and the ball is released from rest (see the drawing). It swings downward and strikes a block initially at rest on a horizontal frictionless surface. Air resistance is negligible, and the collision is elastic. The masses of the ball and block are, respectively, 1.7 kg and 2.4 kg, and the length of the wire is 1.29 m. Find the velocity (magnitude and direction) of the ball (a) just before the collision, and (b) just after the collision.

physics - Elena, Monday, November 5, 2012 at 2:40pm
m1=1.7 kg, m2 =2.4 kg, L=1.29 m.

PE=KE
m1•g•L=m1•v²/2
v=sqrt(2•g•L)
The velocities of the bodies after elastic collision are
u1=(m1-m2)v/(m1+m2),
u2=2m1v1/(m1+m2)
“-“ means the motion in opposite direction

Answer this Question

Related Questions

physics - A ball is attached to one end of a wire, the other end being fastened ...
physics - A ball is attached to one end of a wire, the other end being fastened ...
Physics - A ball is attached to one end of a wire, the other end being fastened...
Physics - A ball is attached to one end of a wire, the other end being fastened ...
College Physics - One end of a 14 m long wire having a total mass of .8000 kg is...
physics - One end of a wire is attached to a ceiling, and a solid brass ball is ...
Physics - A small ball is attached to one end of a spring that has an unstrained...
Physics - A small ball is attached to one end of a spring that has an unstrained...
physics - A 5.2 m wire with a mass of 86 g is attached to the mast of a sailboat...
physics - A 5.9 m wire with a mass of 79 g is attached to the mast of a sailboat...

For Further Reading

First Name:
School Subject:
Answer: