Apainter sits on a scaffold that is connected to a rope passing over a pulley. the other end of the rope rests in the hands of the painter who wants to lift the scaffold. she plans to pull downward on the loose end of the rope, thinking that the scaffold will then rise vertically with her along for the ride. the scaffold has a mass of 52 kg, and her mass is 63 kg. the painter pulls downward on the rope with a force of 600.0 n, while she and the scaffold are hanging from the other end above the ground. (a) what is the net acceleration on the system consisting of the painter and the scaffold

Air is held within a frictionless piston-cylinder container, which is oriented vertically. the mass of the piston is 0.45 kg and the cross-sectional area is 0.0030 m2. initially (state 1) the pressure of the gas is sufficient to support the weight of the piston as well as the force exerted by the atmospheric pressure ( 101.32 kpa). the volume occupied by the air within the cylinder in state 1 is 1.00 liter. one end of a spring (with spring constant k = 1000 n/m) is attached to the top of the piston, while the other end of the spring is attached to a stage that can move vertically. initially the spring is undeflected and therefore exerts no force. then the stage is then moved quasistatically downward a distance of 10.0 cm, at which point the system reaches state 2. the piston-cylinder is not insulated; rather it remains in diathermal contact with the surroundings, which are at a constant temperature of 300 k. what is the change of pressure within the container?

A15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°c to 175°c. what is the specific heat capacity of iron?

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?