Achair of weight 90.0 n lies atop a horizontal floor; the floor is not frictionless. you push on the chair with a force of f = 38.0 n directed at an angle of 42.0 degrees below the horizontal and the chair slides along the floor.
using newton's laws, calculate n, the magnitude of the normal force that the floor exerts on the chair.

An air standard cycle with variable specific heats is executed in a closed system and is composed of the following four processes. 1-2 isentropic compression 100 kpa and 22°c to 600 kpa 2-3 v=constant heat addition to 1500 k 3-4 isentropic expansion to 100 kpa 4-1 p=constant heat rejection to initial state (a) show the cycle on p-v and t-s s (b) calculate the net work output per unit mass (409 kj/kg) (c) determine the thermal efficiency (47.9%)