AtmosfearWinnie Wu, Jennifer Vu & Emily Chan

Block 2-1

There are 12 swings on the Atmosfear and it fits 2 people per

swing. Each round takes 12 seconds. The radius of the swing is 15 meters. The mass of two people

on a swing is 118kg. Find:1. The kinetic energy of the two

people at the top of the ride.2. The efficiency of the ride if the

input energy that the motor gives is 50000J.

1. 2π(15) 12

KE= ½mv² = ½(118)(7.85)² = 3638.5 J

= 364 x 10 J

= 7.85 m/s

Efficiency= Energy OutputEnergy Input × 100%

36404166.7 × 100% = 87.3%

50000 J12 ppl = 4166.7 J/person

2.