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Q. Two identical positive charges exert a repulsive force of 6.4* 10^-9 N when separated by a distance of 3.8*10^-10 m. Calculate the charge of each.

Q. A rock stuck in the tread of a 59cm diameter cicycle wheel has a tangential speed of 3.2m/s. When the brakes are applied, the rock's tangential deceleration is 1 m/s^2.

What is the magnitudes of the rock's angular velocity at t= 1.50s.

What is the magnitudes of the rock's angular acceleration at t= 1.50s ?

At what time is the magnitude of the rock's acceleration equal to g(gravity)

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