An inventor claims to have devised a cyclical engine for use in space vehicles that operates with a nuclearfuel-generated energy source whose temperature is 910 r and a sink at 480 r that radiates waste heat to deep space. he also claims that this engine produces 4.3 hp while rejecting heat at a rate of 14,500 btu/h. is this claim valid

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?