A device known as Atwood's machine consists of two masses hanging from the ends of a vertical rope that passes over a . pulley. Assume the rope and pulley are massless and there is no friction in the pulley. Mass m, is greater than mass my. Find expressions for the magnitude of their acceleration, a, and the tension in the rope, 7. Express your answers in terms of the masses and g, the acceleration due to gravity. ( = T =1 A spherical mass on the end of a string is spinning in a vertical circle about Point P as shown in the image. Which of the forces acting on the mass contribute to the "centripetal force" when the mass is in Position A? Select all that apply. D the force of gravity (weight) D the force of drag (air resistance] El the tension in the string Which of the forces acting on the mass contribute to the "centripetal force" when the mass is in Position 13, directly to the right of Point P? D the force of drag (air resistance] El the force of gravity (weight) D the tension in the string