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**Please anyone help me out ASAP!!!Circular motion Questions**

**Hey guys,i was given about 50 numericals to do related to circular motion .I did most of it but got stuck in the following questions:**

1)The gravitational field near the equator is less than that at the poles.It is partially accounted for by the fact that earth rotates about polar axis.At poles the earth does not move.At the equator,the gravitational pull has to also provide a centripetal acceleration.Calculate the acceleration which represents some of the difference in the gravitational field?(r=6.4 times 10^6)

2)A car travels over a humpback bridge at the speed of 20 m/s.

a)calculate the minium radius of the brifge if the car's road wheels are to remain in contact with the bridge?

b)what happens if the radius is less than this limiting value?

3)At what angle should ta road with 150 m curvature be banked for travel at 75 km/hr?

If you guys can answer any of these questions please please answer me back.I'd really be grateful to you.Thanyou very much.

1)The gravitational field near the equator is less than that at the poles.It is partially accounted for by the fact that earth rotates about polar axis.At poles the earth does not move.At the equator,the gravitational pull has to also provide a centripetal acceleration.Calculate the acceleration which represents some of the difference in the gravitational field?(r=6.4 times 10^6)

2)A car travels over a humpback bridge at the speed of 20 m/s.

a)calculate the minium radius of the brifge if the car's road wheels are to remain in contact with the bridge?

b)what happens if the radius is less than this limiting value?

3)At what angle should ta road with 150 m curvature be banked for travel at 75 km/hr?

If you guys can answer any of these questions please please answer me back.I'd really be grateful to you.Thanyou very much.