Solving for Tension: 3kg Puck's Angular Momentum on Frictionless Table

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In summary, momentum is a measure of an object's motion and is calculated by multiplying its mass and velocity. The law of conservation of momentum states that the total momentum of objects in a closed system remains constant before and after a collision. An elastic collision is one where kinetic energy and momentum are conserved. Momentum is a direct result of Newton's laws of motion, which state that an object will maintain its motion unless acted upon by an external force and that force is related to an object's acceleration and change in momentum.
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A 3kg puck revolves in a circle on a frictionless table at the end of a 50cm long string. The puck's angular momentum is 3kg (m^2/s). What is the tension in the string?

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Knowing the angular momentum what can you find? How does this relate to force or tension?
 
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Parth Dave said:
Knowing the angular momentum what can you find? How does this relate to force or tension?

L= mrv
therefore
3kg*.25m*v = 3kgm^2/2
v=4m/s
F=(mv^2)/r
(3kg*16m/s)/(.25m) = 192N

is this right?
 
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Related to Solving for Tension: 3kg Puck's Angular Momentum on Frictionless Table

1. What is momentum?

Momentum is a measure of an object's motion and is defined as the product of its mass and velocity.

2. How is momentum calculated?

Momentum (p) is calculated by multiplying an object's mass (m) by its velocity (v), expressed as p = m x v.

3. What is the law of conservation of momentum?

The law of conservation of momentum states that in a closed system, the total momentum of all objects before a collision is equal to the total momentum after the collision, as long as there are no external forces acting on the objects.

4. What is an elastic collision?

An elastic collision is a type of collision in which kinetic energy and momentum are conserved. This means that the objects involved in the collision bounce off of each other without any loss of energy.

5. How does momentum relate to Newton's laws of motion?

Momentum is a direct result of Newton's laws of motion, particularly the law of inertia and the law of action and reaction. The first law states that an object will maintain its state of motion unless acted upon by an external force, and the second law relates the force applied to an object to its resulting acceleration and change in momentum.

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