An amusement park ride consists of a rotating
circular platform 7.89 m in diameter from
which 10 kg seats are suspended at the end
of 3.49 m massless chains. when the system
rotates, the chains make an angle of 34.4
◦ with
the vertical.
the acceleration of gravity is 9.8 m/s

what is the speed of each seat?
answer in units of m/s

a car accelerates uniformly from rest and
reaches a speed of 34.8 m/s in 12.4 s. the
diameter of a tire is 92.6 cm.
find the number of revolutions the tire
makes during this motion, assuming no slipping.
answer in units of rev.

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.