Wednesday

January 28, 2015

January 28, 2015

Posted by **monic** on Monday, November 26, 2012 at 11:35pm.

(a) Find the angular speed of the wheels in rad/min.

rad/min

(b) How many revolutions per minute do the wheels make?

rev/min

- trigonometry -
**Reiny**, Monday, November 26, 2012 at 11:42pmone rotation = 2π(48) = 96π inches

in 1 hour it goes 45 miles

= 45x5280x12 inches

= 2851200 inches

number of rotations per hour

= 2851200/(96π) = 9453.8.. rotations per hour

= 157.563 rpm

= 157.563x(2π) radians /min

= 990 radians/min

- trigonometry -
**Steve**, Monday, November 26, 2012 at 11:45pm45 mi/hr * 5280*12 in/mi /(2pi*48in/rev) * hr/60min * 2pi rad/rev = 3960 rev/min

rev/min = rad/min * rev/2pi rad, so divide 3960 by 2pi

- trigonometry -
**Steve**, Monday, November 26, 2012 at 11:47pmOops. Off by a factor of 2. I was using a radius of 48 in

- trigonometry -
**Reiny**, Monday, November 26, 2012 at 11:53pmRats, I read it wrong also

radius should have been 24 , not 48

make the necessary adjustments in the above.

(time to go to bed)

**Answer this Question**

**Related Questions**

trigonometry - A truck with 48-in.-diameter wheels is traveling at 55 mi/h. Find...

Math - A truck with 40-in.-diameter wheels is traveling at 50 mi/h. a) Find the ...

Math - A truck with 36-in.-diameter wheels is traveling at 55 mi/h. Find the ...

Trignometry - A car is moving at a rate of 55 mph and the diameter of its wheels...

Pre-calc - A car is moving at the rate of 60 miles per hour, and the diameter of...

L PreCal - A car is moving at a rate of 65 miles per housr and the diameter of ...

physics - What is the angular speed in rev/min of the Earth as it orbits around ...

Physics- drwls please help - A certain CD has a playing time of 80 minutes. When...

Trigonometry - The wheels of a scooter have a diameter of 4.5 inches. If the ...

physics - An automobile traveling at 50.0 km/h has tires of 100.0 cm diameter. (...