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Introduction To Physics (PHYS 111N) Momentum In An Explosion

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what is the magnitude of the momentum |p⃗ a,i| of piece a before the explosion?

Physics- Momentum In An Explosion Homework Sheet With Answers

University

Old Dominion University

Part A
What is the magnitude of the momentum | | of piece A before the explosion?
Express your answer numerically in kilogram meters per second.
Hint 1. Initial momentum
The momentum of any object is determined by the product of the object’s mass and velocity. The egg is initially at
rest. Use this to find the initial momentum.

Part B
During the explosion, is the magnitude of the force of piece A on piece B greater than, less than, or equal to the
magnitude of the force of piece B on piece A?
p ⃗
A,i
|p | = 0 ⃗
A,i kg ⋅ m/s
Hint 1. Forces in an explosion
The forces specified in this problem must obey Newton’s third law, which states that every action has an equalmagnitude
and oppositely-directed reaction.

Part C
The component of the momentum of piece B, , is measured to be +500 after the explosion. Find the
component of the momentum of piece A after the explosion.
Enter your answer numerically in kilogram meters per second.
Hint 1. Conservation of momentum
The law of conservation of momentum states that the total momentum in an isolated system of objects must
remain constant, regardless of the interactions (or collisions) between the objects. Thus, the total momentum of
the two pieces of the egg

Problem 8.05
The speed of the fastest-pitched baseball was 42.0 , and the ball’s mass was 145 .
Part A
What was the magnitude of the momentum of this ball?

Part B
How many joules of kinetic energy did this ball have?

Part C
How fast would a 50.0 gram ball have to travel to have the same amount of kinetic energy?

Part D
How fast would a 50.0 gram ball have to travel to have the same amount of momentum?

Problem 8.09: Recoil Speed of the Earth
In principle, any time someone jumps up, the earth moves in the opposite direction.
Part A
To see why we are unaware of this motion, calculate the recoil speed of the earth when a 81.0 person jumps upward
at a speed of 2.10 . Consult Appendix E in the textbook as needed

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Introduction To Physics (PHYS 111N) Momentum In An Explosion

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