Saturday
April 18, 2015

# Homework Help: trig

Posted by Azal on Saturday, July 20, 2013 at 3:13pm.

1. A Ferris wheel with a radius of 7m makes one complete revolution every 16 s. The bottom of the wheel is 1.5m above ground.
a)Find the equation of the graph
b)predict how the graph and the equation will change if the Ferris wheel turns more slowly
c) test your predictions from part b by drawing a graph for three revolutions and finding a equation if the wheel completes one revolution every 20 s.
• trig - Steve, Saturday, July 20, 2013 at 3:24pm

since sin(kt) has period 2pi/k, we have

y = 7sin(pi/8 t) + 8.5

with appropriate shift depending on where the wheel is at time 0.

slower turning means longer period, so the coefficient of t will decrease.

• trig - Azal - pleaseee helpp, Saturday, July 20, 2013 at 3:30pm

why pi?

• trig - Steve, Sunday, July 21, 2013 at 4:57am

set 2pi/k = 16 and solve for k.
Because the period is 16. Normally, sin(x) has period 2pi. Review your text and reread my first line.

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