Questions from Thermal Fluid Science

Q: A 200-kg granite rock (ρ = 2700 kg/

A 200-kg granite rock (ρ = 2700 kg/m3) is dropped into a lake. A man dives in and tries to lift the rock. Determine how much force the man needs to apply to lift it from the bottom of the lake. Do you...

Q: The hull of a boat has a volume of 180 m3,

The hull of a boat has a volume of 180 m3, and the total mass of the boat when empty is 8560 kg. Determine how much load this boat can carry without sinking (a) in a lake and (b) in seawater with a sp...

Q: The specific kinetic energy of a moving mass is given by ke

The specific kinetic energy of a moving mass is given by ke = V2/2, where V is the velocity of the mass. Determine the specific kinetic energy of a mass whose velocity is 100 ft/s, in Btu/lbm.

Q: The density of a liquid is to be determined by an old

The density of a liquid is to be determined by an old 1-cm-diameter cylindrical hydrometer whose division marks are completely wiped out. The hydrometer is first dropped in water, and the water level...

Q: It is said that Archimedes discovered his principle during a bath while

It is said that Archimedes discovered his principle during a bath while thinking about how he could determine if King Hiero’s crown was actually made of pure gold. While in the bathtub, he conceived t...

Q: It is estimated that 90 percent of an iceberg’s volume is below

It is estimated that 90 percent of an iceberg’s volume is below the surface, while only 10 percent is visible above the surface. For seawater with a density of 1025 kg/m3, estimate the density of the...

Q: One of the common procedures in fitness programs is to determine the

One of the common procedures in fitness programs is to determine the fat-to-muscle ratio of the body. This is based on the principle that the muscle tissue is denser than the fat tissue, and, thus, th...

Q: A cone floats in the glycerin (SG = 1.26

A cone floats in the glycerin (SG = 1.26), as shown in the figure. Find the mass of the cone.

Q: The weight of a body is usually measured by disregarding buoyancy force

The weight of a body is usually measured by disregarding buoyancy force applied by the air. Consider a 20-cm-diameter spherical body of density 7800 kg/m3. What is the percentage error associated with...

Q: An air-conditioning system requires a 34-m-long

An air-conditioning system requires a 34-m-long section of 12-cm-diameter ductwork to be laid underwater. Determine the upward force the water will exert on the duct. Take the densities of air and wat...