#### Transcript of LPH 105 W15 7.7-10

A 2.5 kg sphere moving east at 5.2 m/s glances off a 3.5 kg sphere initially at rest.

If the second sphere has a final speed of 2.7 m/s and its angle is found to be 58.4 , FIND the speed and angle of the first ball after the collision. Do NOT assume elastic collision.

A 2.5 kg sphere moving east at 5.2 m/s glances off a 3.5 kg sphere initially at rest.

If the first sphere is known to come off at an angle of 45 degrees to its initial motion, and the second sphere has a speed of 2.7 m/s but its angle is unknown, FIND the speed of the first ball after the collision, and the angle of the second ball. Let the collision BE ELASTIC. (hint use energy first)

A 2 kg clay ball travels 4 m/s north, and a 3 kg clay ball travels 5 m/s east. If they collide perfectly inelastically, what is their velocity (speed and direction) after the collision?

Let a 4 kg clay ball moving 4 m/s south collide inellastically into a 2 kg clay ball traveling north at 2 m/s . Find the final velocity of the new clay ball.

And find the amount of kinetic energy that is lost.

**three masses of m, 2m and 3m are placed on a meter stick, at positions 10 cm, 35 cm and 60 cm respectively. what is their center of mass if the meter stick has a mass of .5m?**

4.55 m/s

45 degree

4.1 m/s

50.1 degree

3.4 m/s

28. Degrees

"How would you set up a problem like question 4 on today's pre quiz?"

"How do we know if we should use the center of mass in an equation?"

"How do we know if we should use the center of mass in an equation?"

"I could get the correct answer on this one... "A 1.00 m long, 2.00kg uniform baton has a small mass on one end an a large mass on the other. If the small, 1.50 kg, mass is located at a chosen position of 'zero', and the 3.50 kg mass is located at the position of '1.00 m' where is the center of mass for the baton and its two masses? (answer should look like '0.342 m')""

"translational motion"

**.44**

2 m/s south

24 J

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