1kg steam at pressure of 1 bar, contained in a cylinder of cross-sectional area 1.69 square meters, freely supports a movable, leakproof cover of fixed weight. the cylinder is heated externally to raise the temperature of the steam from 100 °cto 300 °c. assuming no heat loss to the environment, calculate the amount of heat required for this process.

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?