Problem 3: If a horizontal force P = 12 lb is applied to block , determine the acceleration of the block . Neglect friction. Hint: Acceleration of to the right and acceleration of upward, are ‘related’ to each other!

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up