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December 21, 2014

December 21, 2014

Posted by **me** on Thursday, December 28, 2006 at 8:57pm.

a)vertically up

b)horizontally forward

c)horizontally backwards

d) zero

e)greater than zero but less than 45 degrees below the horizontal

I think the answer would be d)zero since the car's tire is going at constant velocity. Would my thinking be correct?

The correct answer is "vertically up". The car's tire is going at constant speed, but the velocity is constantly changing direction. The instantaneous velocity of the part of the tire that is in contact with the road is zero, so the stone is not subjected to a tangential acceleration.

From the moment it is caught in the tire it is rotating with the tire. An object that is rotating around some point with constant speed is accelerating toward that point with the centripetal acceleration of v^2/r.

- physics. -
**Rock**, Tuesday, May 7, 2013 at 11:44amA vertically upward since that is the direction of centripetal acceleration at that time.

- physics. -
**Anonymous**, Thursday, October 10, 2013 at 9:55pmA car traveling in a straight line has a velocity

of +4.4 m/s. After an acceleration of 0.65

m/s2

, the car’s velocity is +8.8 m/s.

In what time interval did the acceleration

occur?

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