This document contains 4 physics problems related to forces, motion, and rotational dynamics: 1) A block of mass 20 kg is being accelerated by a force of 400 N on a ramp with a coefficient of friction of 0.2. Calculate the acceleration of the block. 2) A pulley system is at equilibrium with known masses for the pulleys and bar. Calculate the tension in one of the cords. 3) A 2 kg body is released from rest and reaches a maximum speed of 5 m/s. Calculate the tension in the supporting cord at this moment. 4) A mass m is rotating with equal tensions in two cords. Given the length of one cord, calculate the angular velocity