Question

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??

Answers

Damon
10.5 in * 58 rev/min * 2 pi radians/rev = I get 3826 in/min
Damon
By the way, earlier I notice you were looking for a calculator:

http://www.mathsisfun.com/scientific-calculator.html
y912f
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:)
Damon
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
y912f
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
y912f
i think you have to use the formula
w=pi/t

maybe..
Damon
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
Damon
.49 I mean
y912f
so 5pi/32

thank you soo much!!!!

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