# Physics questions

## Homework Statement

Can someone help me with these problems?

1) The drum of a washing machine reduces the rpms from 900 rpm to 300 rpm. In doing so, it performs 50 rotations. Calculate:

a) angular accelartion b) the time required to perform 50 rotations.

2)A railway engine starts from rest on the peak of a declined surface with an angle of inclination 1%. It covers 1.200m downwards due to the gravitational force and continues thereafter on an even track. The tractive resistance is constant and rated at 500N per ton. Calculate:

a) the velocity v at the base of the inclined track.
b) The distance covered by the train on the level track until it stops.

3) A bullet of mass m=1 kg moves at a speed of 12m/s and collides in the center of another bullet with a mass of 2kg that moves at a speed of 24m/s in opposite direction.
Calculate:

a) the velocity of each bullet after the impact, if the coefficeint of impact 2/3

b) the velocity of each bullet, if these behave as one body with the coefficient of impact 2/3

c) the velocity of each bullet, if the impact is completely inelastic with the coefficient of at impact 2/3.

## Homework Equations

What equations can be used to answer these problems?

## The Attempt at a Solution

I find some parts to the answer but can not completely finish the problem off, can someone help?