F - A = 0.8 cm2 Patm = 1 bar D Gas

The figure below shows a spherical buoy, having a diameter of 1.7 m and weighing 6500 N, anchored to the floor of a lake by a cable. The density of the lake water is 10³ kg/m³ and g = 9.81 m/s². Determine the force exerted by the cable, in N. Water p = 10³ kg/m³ Buoy Cable

A torque of 2 N-m is necessary to rotate a paddle wheel at a rate of 20 rad/s.The paddle wheel is located in a rigid vessel containing a gas. What is the net work injoule done on the gas during 10 minutes of operation?

Calculate the spring constant, k, in kN/m.

The boom of a fire truck raises a fireman (and his equipment—total weight 280 lbf) 40 ft into the air to fight a building fire. (a) Showing all your work and using unity conversion ratios, calculate the work done by the boom on the fireman in units of Btu. (b) If the useful power supplied by the boom to lift the fireman is 3.50 hp, estimate how long it takes to lift the fireman.

A gas is contained in a vertical piston-cylinder assembly by a piston with a face area of 60 in2 and weight of 100 lbf. The atmosphere exerts a pressure of 14.7 lbf/in² on top of the piston. A paddle wheel transfers 3 Btu of energy to the gas during a process in which the elevation of the piston increases slowly by 2 ft. The piston and cylinder are poor thermal conductors, and friction between the piston and cylinder can be neglected. Determine the work done by the gas on the piston, in Btu, and the change in internal energy of the gas, in Btu. Step 1 Determine the expansion work done by the gas on the piston, in Btu. Wexp = i Btu

An electric boiler generates 100,000 Btus of heat. Roughly, what is the electrical input of the boiler (in other words, the electrical energy to produce the output), in kilo-watts?

A firearm can be modeled as a kind of heat engine, where the projectile acts as a piston that separates from the rest of the system during expansion. Consider a rifle with a 1.70 kg barrel made of iron [specific heat = 448 J/(kg °C)]. The rifle fires a 4.00 g bullet that exits the barrel with a speed of 350 m/s. When the propellant is ignited, 1.10% of the energy released goes into propelling the bullet (this is the thermal efficiency of the "engine"). The other 98.9% can be approximated as being entirely absorbed by the barrel, which increases in temperature uniformly for a short time before this energy is dissipated into the surroundings. What is this temperature increase (in °C)? (Round your answer to at least one decimal place.) °℃

For a gas of volumes Vi = 9.50  10-4 m3 and Vf = 1.40  10-4 m3 and pressures Pi = 2.00  106 Pa and Pf = 2.05  107 Pa, answer the following.For an isobaric process at Pi, find the internal energy change of the gas during this process.For an isovolumetric process at Vi, find the internal energy change of the gas during this process.

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