Assume that a 4.00 kg pendulum bob is hanging from a 7.90 m long cable. the cable is attached to a hook in the ceiling 10 m up from the floor. (a) if a person releases the bob, from the small angle approximation, how long will it take the bob to swing back to him? s (b) what is meant by the small angle approximation? any angle less than 3° any angle less than 5° any angle less than 10° any angle less than 15°