Question
A car races on a circular track of radius r.
(a) Write an equation for the car's average speed when it travels a complete lap in time t.
(b) The radius of the track is 100 m and the time to complete a lap is 14 s. Show that the average speed around the track is 45 m/s.
(a) Write an equation for the car's average speed when it travels a complete lap in time t.
(b) The radius of the track is 100 m and the time to complete a lap is 14 s. Show that the average speed around the track is 45 m/s.
Answers
Henry
a. Circumference = pi*2r = 3.14*2r =
6.28r
V = C/t = 2pi*r/t
b. V = 6.28*100m/14s = 45 m/s.
6.28r
V = C/t = 2pi*r/t
b. V = 6.28*100m/14s = 45 m/s.