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Physics Help???

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A 50.0 kg block of ice moving to the right at 40.0 cm/s on an icy (frictionless) lake makes an elastic head-on collision with a 25.0 g ice cube that is at rest initially.

a)What is the velocity of each object after the collision?

b)What fraction of the initial kinetic energy is transferred to the 25.0 g ice cube?
asked Mar 24, 2015 in PHYSICS by heather Apprentice

2 Answers

0 votes

(a)

Step 1:

Mass of the moving block is image kg.

Velocity of moving block is image.

Mass of the ice cube in rest is image g.

Two blocks make a head on elastic collision.

Find the velocity of each object after the collision.

Velocity of the first object after collision is image.

image

Velocity of the moving block after collision is 40 cm/s.

Step 2:

Velocity of the ice cube after collision is image.

image

Velocity ice cube after collision is 80 cm/s.

Solution :

Velocity of the moving block after collision is 40 cm/s.

Velocity ice cube after collision is 80 cm/s.

answered Mar 24, 2015 by yamin_math Mentor
0 votes

(b)

Step 1:

Mass of the moving block is image kg.

Velocity of moving block is image.

Mass of the ice cube in rest is image g.

Velocity of the moving block after collision is 39.96 cm/s.

Velocity ice cube after collision is 80 cm/s.

Find energy transferred to the 25.0 g ice cube.

Energy transferred to the 25.0 g ice cube is image.

image

So the energy transferred to the 25.0 g ice cube is0.008 J.

Energy transferred to the 25.0 g ice cube is very small.

Solution :

The energy transferred to the 25.0 g ice cube is0.008 J.

answered Mar 24, 2015 by yamin_math Mentor

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