A submerged steel-reinforced concrete block, with a specific weight of 164 lbf/ft3, is needed to keep the 2 foot-wide gate in a closed position when the depth, H, of the liquid is 4.4 feet. The block is connected to the gate by a cable and system of pulleys. The specific gravity of the liquid is 0.98. The gate pivots about point A. To 3 significant digits, the minimum volume of the submerged concrete block is (if the third digit is a zero, make sure you include it)

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

Fluids at rest possess no flow energy. a)- true b)- false

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?