# physics.

A car travels forward with constant velocity. It goes over a small stone, which gets stuck in the groove of a tire. The initial acceleration of the stone, as it leaves the surface of the road is,
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.

1. 👍 0
2. 👎 0
3. 👁 1,065
1. A vertically upward since that is the direction of centripetal acceleration at that time.

1. 👍 0
2. 👎 0
posted by Rock
2. A 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?

1. 👍 0
2. 👎 0

## Similar Questions

1. ### PHYSICS

Both car A and car B leave school at the same time, traveling in the same direction. Car A travels at a constant speed of 79 km/h, while car B travels at a constant speed of 89 km/h. How far is Car A from school 1.6 h later?

asked by naia on September 13, 2011
2. ### physics

A car is moving with constant velocity. Which of the following is true? a) the car travels the same distance in each second b) car's velocity increases by the same amount in each second c)car's velocity decreases by the same

asked by Tammy on October 15, 2007
3. ### Physics

A 1200 kg car pulls an 820 kg trailer over a rough road. The force of friction acting on the trailer is 650 N [backwards]. Calculate the force that the car exerts on the trailer if (a) the trailer is moving at a constant velocity

asked by Jenuson on November 16, 2014
4. ### Physics

A car with its passengers have a total mass of 4200kg .the car is travelling along a horizontal road when it moves ,it experiences a forward driving force of magnitude F newtons and a constant resistance force(opposite to driving

asked by Ali on November 19, 2016
5. ### physics

A car is moving with constant acceleration. Which of the following is true? a) the car travels the same distance in each second b) car's velocity increases by the same amount in each second c)car's velocity decreases by the same

asked by Tammy on October 15, 2007
6. ### science

A 64-kg woman stands on friction less level ice with a 0.9-kg stone at her feet. She kicks the stone with her foot so that she acquires a velocity of 9.2 cm/s in the forward direction. The speed acquired by the stone is:

7. ### physics

A car travels a distance of 100m per second with a constant acceleration and average velocity of 20m per second .The final velocity acquired by the car is 25m per second .Find The initial velocity and acceleration of car

asked by Anonymous on July 2, 2013
8. ### physics

A car travels a distance of 100m per second with a constant acceleration and average velocity of 20m per second .The final velocity acquired by the car is 25m per second .Find The initial velocity and acceleration of car

asked by Anonymous on July 2, 2013
9. ### physics

A car travels a distance of 100m per second with a constant acceleration and average velocity of 20m per second .The final velocity acquired by the car is 25m per second .Find The initial velocity and acceleration of car

asked by Anonymous on July 2, 2013
10. ### Physics

(a)A car travels exactly once around a circle of radius 5.0 m at constant speed of 3.0 m/s. What is the car’s average velocity (magnitude and direction) during this interval? Explain/justify. (b)Repeat the calculation of average

asked by Sonya on September 19, 2009

More Similar Questions