)a pendulum bob swings through an arc 40 inches long on its first swing. each swing thereafter, it swings only 60% as far as on the previous swing. how far will it swing altogether before coming to a complete stop? round to the nearest inch when necessary.

What is the coefficient of kinetic friction μk between the block and the tabletop?

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?