A solid sphere rolls down a roof

solid sphere rolls down a roofA solid sphere starts from rest and rolls without slipping a distance of 8 m down a roof that is inclined at 25˚. The roof’s edge is 5 m high from the ground. How far horizontally from the roof’s edge does the sphere hit the ground?

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Ring, Disc and Sphere

A ring, a solid disc and a solid sphere are released simultaneously and roll down an inclined plane. What is the order of finish?

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The Polar Ice Cap Is Now Melting

imageAccording to NASA, the polar ice cap is now melting at the alarming rate and sea-level rise all around the Earth. This redistribution of mass will cause the Earth’s day to become

a) longer
b) shorter
c) stay the same
d) the earth will stop rotating
e) not enough information

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