Posted by y912f on Saturday, January 17, 2009 at 1:59pm.
A wheel with a 21inch 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/scientificcalculator.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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