- #1
pcypoon
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Homework Statement
1. A moving object collides with a stationary object.
(a) Is it possible for both objects to be at rest after the collision? If "yes," give an example. If "no," explain why not.
(b) Is it possible for only one object to be at rest after the collision? If "yes," give an example. If "no," explain why not.
Homework Equations
p tot = ptot'
p = mv
The Attempt at a Solution
(a) ptot = m1v1 + m2v2
m2v2 is 0,
ptot' = m1v1' + m2v2'
ptot = ptot'
m1v1 = m1v1' + m2v2'
Now I'm stuck, I think the answer is no, i think both of them will move, but how do I show this?
(b) same problem, I'm stuck!
Homework Statement
2. A wet snowball of mass m, traveling at speed v, strikes a tree. It sticks to the tree and stops. Does this example violate the law of conservation of momentum? Explain.
Homework Equations
p= mv
The Attempt at a Solution
this is what I thought m1 is snowball m2 is tree
m1v1 + m2v2 = (m1+m2)'v12'
LS = m1v1
RS = (m1+m2)' v12'
LS does not equal right side, therefore LOC of M does not hold, but I feel that I have done a fallacious step somewhere.
Homework Statement
5. An object of mass m has an elastic collision with another object initially at rest, and continues to move in the original direction but with one-third its original speed. What is the mass of the other object in terms of m?
Homework Equations
p = mv
Ek = 1/2mv^2
The Attempt at a Solution
Given
m1 =?
m2= ?
v1 = ?
v2 = 0
v1' = 1/3(v1)
v2' = ?
m1v1 + m2v2 = m1v1' + m2v2'
m1v1 = m1v1" + m2v2'
m1v1 = m1(1/3v1) + m2v2'
Now I am stuck, How do I solve for m2? Do I use Ek = 1/2mv^2 eqns and stuff.