Posted by **y912f** on Saturday, January 17, 2009 at 1:59pm.

A wheel with a 21-inch diameter is turning at the rate of 58 revolutions per minute. To the nearest inch, what is the velocity of a point on the rim in inches/minutes?

3879 inches/minutes

is my answer correct??

- trigonometry -
**Damon**, Saturday, January 17, 2009 at 2:05pm
10.5 in * 58 rev/min * 2 pi radians/rev = I get 3826 in/min

- trigonometry -
**Damon**, Saturday, January 17, 2009 at 2:14pm
By the way, earlier I notice you were looking for a calculator:

http://www.mathsisfun.com/scientific-calculator.html

- trigonometry -
**y912f**, Saturday, January 17, 2009 at 2:20pm
yes,..the guy was teaching me how to do this problem

[pi,3pi/2];tan s=1

can you help..i need to use this link to figure out this problem..please guide me through:)

- trigonometry -
**Damon**, Saturday, January 17, 2009 at 2:28pm
We are in quadrant 3

so add 180 degrees or pi radians to answer whatever we get first

on calculator

click radians on upper right

type in the number 1

click atan

answer .785 ......

click +

click Pi

click =

get 3.926...... radians

- trigonometry -
**y912f**, Saturday, January 17, 2009 at 2:39pm
so..5pi/4

thank you very very much..i just have one LAST problem i need help with

A pulley of radius 11cm rotates 5 times in 64 seconds. Find the angular velocity of the pulley.

thnks again

- trigonometry -
**y912f**, Saturday, January 17, 2009 at 2:40pm
i think you have to use the formula

w=pi/t

maybe..

- trigonometry -
**Damon**, Saturday, January 17, 2009 at 2:46pm
Yes, 5 pi/4

You could have seen that from the start because you probably know that the tan of 45 deg (Pi/4 radians) is 1 and pi/4 + pi = 5 pi/4

--------------------------------------

radius has noting to do with this

5 * 2 pi radians / 64 s

= (10/64) pi rad/s = .49 rad/s

- 0.49 rad/s -
**Damon**, Saturday, January 17, 2009 at 2:48pm
.49 I mean

- trigonometry -
**y912f**, Saturday, January 17, 2009 at 2:53pm
so 5pi/32

thank you soo much!!!!

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