Which of the following statements would best describe how to increase the work done by a heat engine? a. lower the temperature of the hot reservoir. b. raise the temperature of the exhaust. c. lower the temperature of the exhaust. d. raise the temperature of the cold reservoir. **not you: )

An object's buoyant force and weight mean the same thing.a. trueb. false

The radius of a sphere is increasing at a rate of 9 cm/ sec. find the radius of the sphere when the volume and the radius of the sphere are increasing at the same numerical rate.

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.