An amusement park ride consists of a rotat- ing circular platform 6.9 m in diameter from
which 10 kg seats are suspended at the end of
2.5 m massless chains. When the system ro-
tates, the chains make an angle of 39.3° with
the vertical.
The acceleration of gravity is 9.8 m/s2.
O
What is the speed of each seat?
Answer in units of m/s.

magnified images possible images can be real = projected onto a screen

we need to know the time interval during which the force acts. impulse of force = momentum change

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.