







Revolutions per minute 
20141024 

Edward pose la question : Hello; I have a 28.2 inch diameter tire; do not worry about engine RPM or gear ratios, please tell me what the RPM
of that tire is at 8 MPH and 64 MPH. Thank you.
Sincerely; Edward Penny Nom lui répond. 





Angular speed 
20140629 

andrea pose la question : a wheel having a radius of 10cm rotates such that the linear speed at its rim is 30mls.
what is the angular speed of the wheel in rpm? Penny Nom lui répond. 





How many rpm does a 3.5 in. diameter wheel turn at 7 miles per hour? 
20111206 

Al pose la question : how many rpm does a 3.5 in. diameter wheel turn at 7 miles per hour Penny Nom lui répond. 





Angular speed 
20101212 

Jason pose la question : 7 in. pulley traveling @ 175ft/sec. What is the rpm? Stephen La Rocque and Penny Nom lui répond. 





The current in a river 
20080612 

Joi pose la question : To approximate the speed of the current of a river, a circular paddle wheel with radius 4 feet is lowered into the water. If the current causes the wheel to rotate at a speed of 10 revolutions per minute, what is the speed of the current? Express your answer in miles per hour. Harley Weston lui répond. 





Is there a practical use for radian measure? 
20071026 

Paula pose la question : Is there a practical use for radian measure in any profession? Which professions might us radian as opposed to degree measure? Harley Weston lui répond. 





Angular speed 
20070118 

Cristina pose la question : A car is moving at a rate of 50 miles per hour, and the diameter of its wheels is 2.5 feet. a) Find the number of revolutions per minute the wheels are rotating. b) Find the angular speed of the wheels in radians per minute. Stephen La Rocque lui répond. 





What size pulley would I need? 
20061229 

Chris pose la question : If I have a motor that's spinning at 950 RPM's with a pulley that's 6in diameter with a belt running to a generator, What size pulley would I need on the generator to make it spin at 3600 RPM Penny Nom lui répond. 





A rock on a string 
20031026 

A student pose la question : a rock on a 4' string is rotated at 80 rpm. what is the linear speed in feet per second? in miles per hour? Penny Nom lui répond. 





PreCalculus 
20000809 

Angela pose la question : Use absolute values to define the interval or pair of intervals on the real line.
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A car is moving at the rate of 50 miles per hour, and the diameter of its wheels is 2.5 feet. a) Find the number of revolutions per minute that the wheels are rotating. b) Find the angular speed of the wheels in radians per minute. Harley Weston lui répond. 

