Saturday

January 31, 2015

January 31, 2015

Posted by **Melody** on Tuesday, October 13, 2009 at 8:02am.

h = -35cos(2pi*X/5)+37

I have calculated at what height I would be after 3 minutes by substituting X=3 in the above equation. However, I need to calculate at what times I would be 30m off the ground. Can you please tell me if I am on the right track and how to calculate the time?

Many thanks

- Maths -
**Reiny**, Tuesday, October 13, 2009 at 8:28amI agree with your equation, so let' set it equal to 30

30 = -35cos(2pi*X/5)+37

-7 = -35cos(2pi*X/5)

.2 = cos(2pi*X/5)

take the inverse cosine to get

2pi*X/5 = 1.369438

x = 1.09 minutes

check it by repeating the same steps you did finding the height at 3 minutes.

- Maths -
**Melody**, Wednesday, October 14, 2009 at 6:26amMany thanks, I understand that now.

I have another question I am stuck on also. How do I get an equation for the height of the car on the ferris wheel over a 10 minute period if we start the analysis one minute into the ride.

Can I still use the original formula

h = -35cos(2pi*X/5)+37

I don't understand what part changes to make it one minute into the ride. Appreciate any help.

**Answer this Question**

**Related Questions**

Math - I have another question I am stuck on that follows a previous question. ...

trig question - A Ferris wheel has a deameter of 50m. The platform at the bottom...

Physics - A Ferris wheel with radius 11.0 m rotates at a constant rate, ...

Physics - A Ferris wheel with radius 9.8 m rotates at a constant rate, ...

Physics - A Ferris wheel with radius 9.8 m rotates at a constant rate, ...

physics - A Ferris wheel with radius 8.8 m rotates at a constant rate, ...

math - the maximun height of a ferris wheel is 35m. the wheel takes 2 mins to ...

Math (Trig) - a ferris wheel has a radius of 10m and is one meter above the ...

Trig - Hi everyone, I have a WS due tomorrow, and would really appreciate some ...

Maths - A ferris wheel has an axle standing 38m off the ground and a radius of ...