# Project #47941 - physics

2) A star with a mass and radius of our sun rotates once every 30 days. It undergoes

gravitational collapse and forms a pulsar that emits a radio pulse every 0.10 seconds.

By treating the neutron star as a solid sphere, determine its radius.

3) The Planet Express rocket has a mass of 2,000 kg and is approaching Omicron Persei

8 at 25,000 km/hr. It needs to slow down to 15,000 km/hr in order to begin a controlled

descent to the surface of the planet. To brake, several 5.0 kg pellets of dark matter

can be fired straight ahead of the ship. Due to the nature of the dark matter, it is fired

at 139,000 m/s relative to the rocket. Use conservation of momentum to determine

how many pellets need to be fired to slow the rocket to the necessary final velocity of

15,000 km/hr?

4) A uniform bowling ball (ignore finger holes) has a radius R and mass M. It is initially

thrown so that it is sliding without rolling at v0 on a lane with coefficient of friction μ.

What is the general equation for how far the ball will go before it starts to roll without

slipping? What is its velocity at that point in time? (conservation of angular momentum

& kinematics)

 Subject Science Due By (Pacific Time) 11/18/2014 03:27 pm
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