Posted by **andrew** on Monday, October 4, 2010 at 5:29pm.

A bicycle wheel that initially spins at 3 revolutions per second is braked uniformly to a stop in 1 second. A spot is painted at the outer edge of the wheel. How many revolutions does the spot go during the time it takes the wheel to stop?

The answer I got was 0.5 but was incorrect so can someone show me how to do this problem.

- Physics -
**bobpursley**, Monday, October 4, 2010 at 5:33pm
I like moving things to radians, not revs.

angularaccleration=changevleociyt/time

= -3*2PI/1 rad/sec

finalangulvelocity^2=intialangularvelocity^2+2*angularacceleration*displacement

0=(3*2PI)^2+2(-2*3PI)*displacment

solve for displacement (in radians) ; divide by 2PI to get revs.

- Physics -
**andrew**, Monday, October 4, 2010 at 5:35pm
Ok thanks.

- Physics -
**Mak**, Saturday, October 27, 2012 at 1:49pm
1.5 revolutions.

If it starts at 3 rev/sec and ends at 0 rev/sec and decelerates uniformly, then the avg is 1.5 rev/sec. It spent 1 second, so 1.5 rev/sec * 1 sec = 1.5 rev

## Answer This Question

## Related Questions

- Physics - A bicycle wheel of radius 0.30 m is spinning at a rate of 60 ...
- physics - A bicycle wheel of radius 0.4 m is spinning at a rate of 40 ...
- Math - A bicycle wheel is 30 inches in diameter. a. to the nearest revolution, ...
- Physics - The wheel of a car has a radius of 0.288m and is being rotated at 830 ...
- math - One wheel has a diameter of 30 inches and a second wheel has a diameter ...
- Physics - A bike wheel rotates uniformly through 2 revolutions in 3 seconds. a) ...
- Physics - A CD rotates at 500 (revolutions per minute) while the last song is ...
- Physics - A bicycle wheel of radius .7m is rolling without slipping on a ...
- Math - A bicycle travels 42 meters for every 20 revolutions of the wheel. How ...
- Math - A bicycle travels 42 meters for every 20 revolutions of the wheel. How ...

More Related Questions