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4. Calculate the centripetal acceleration for an object on the surface of radius 4000 km and, and the day is equal to 120 000 seconds. 5. A particle is moving along a circular path of radius 1.5 m and has an angular velocity of 10 rads/s. What is the particle's radial acceleration? What is the particle's tangential velocity? 6. An object sweeps out a central angle of T/2 radians in 0.50. seconds as it moves along a circle of radius 2 m. Find its linear and angular speed over that time period. 7. An object travels a distance of 30 ft in 3 seconds as it moves along a path of radius 3ft. calculate for the linear and angular speed over the time period. 57