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## Homework Statement

the diagram shows two bodies X and Y connected by a light cord passing over a light, free-running pulley. X starts from rest and moves on a smooth plane inclined at 30 degrees to the horizontal.

What will be the total kinetic energy of the system when X has travelled 2.0m along the plane?(g=9.8m/s

^{2})

## Homework Equations

E=mgh

## The Attempt at a Solution

my teacher ask me to find the perpendicular distance of y and x, then use formula E=mgh to find the differences between potential energy between X and Y, and the differences will equal to the total kinetic energy since energy is conserved during the whole motion

BUT, i cant even find the perpendicular distance of X and Y

## Homework Statement

A stationary thoron nucleus (A=220, Z=90) emits an alpha particle with kinetic energy E

_{a}. What is the kinetic energy of the recoiling nucleus?

## Homework Equations

## The Attempt at a Solution

i totally have no idea about it.

## Homework Statement

Particles X (of mass 4 units) and Y ( of mass 9 units) move directly towards each other, collide and then separate. If [tex]\lambda[/tex]V

_{x}is the change of the velocity of X and [tex]\lambda[/tex]V

_{y}is the change in velocity of Y, the magnitude of ratio [tex]\frac{\lambdaV

_{x}}{\lambdaV

_{y}}[/tex]

## Homework Equations

## The Attempt at a Solution

well the answer state is [tex]\frac{9}{4}[/tex]

but i get [tex]\frac{2}{3}[/tex], just by rationing both magnitude right?

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