A construction crane lifts a prestressed concrete beam weighing 3 short tons from the ground to the top of piers that are 24 ft above the ground. Determine the amount of work done considering (a) the beam and (b) the crane as the system. Express your answers in both lbf·ft and Btu.

Q: r of 2.29" is to be enlarged by blowing air into it. If the surface tension of the soap solution is…

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Q: A closed system having a mass of 50 kg has an initial velocity of 10 m/s. Subsequently its velocity…

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Q: An oil pump is drawing 25 kW of electric power while pumping oil with ρ = 860 kg/m3 at a rate of 0.1…

A: Given Data: Inlet and outlet areas of the cross-section of pipe to the pump can be calculated as,

Q: Can a system have a higher second-law efficiency than the first-law efficiency during a process?…

A: Yes, a system can have a higher second -law efficiency than the first-law efficiency during a…

Q: For an energy storage capacity of 5 × 106 kWh, determine the minimum amount of water that needs to…

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Q: Determine the Kinetic energy in BTU of a 8 lbm block moving at a velocity of 85 ft/s.

A: Given data  mass of block (m)= 8 lbm velocity of block(v) = 85 ft/s

Q: A mass of 15 kg of air in a piston–cylinder device is heated from 25 to 95°C by passing current…

A: The flow of electricity is considered as the work done on the system. The enthalpy change of the gas…

Q: Consider a TV set that consumes 120 W of electric power when it is on and is kept on for an average…

A: Given: The average time per day TV is kept on is t=6 h The power consumes by the TV is P=120 W The…

Q: The pressure inside a system varies inversely with the square of the volume of the system. Determine…

A: The initial volume of the system is, V1=2 m3 The initial pressure of the system is, P1=200 kPa The…

Q: soap bubble with a diameter of 2.12" is to be enlarged by blowing air into it. If the surface…

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Q: A 2.5-m3 rigid tank initially contains air whose density is 1.18 kg/m3. The tank is connected to a…

A: Option A is correct.    m = 25.4678 lb

Q: 350 kJ of heat is added in a piston-cylinder arrangement containing air causing it to expand in a…

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Q: A crater lake has a base area of 20,000 m2 , and the water it contains is 12 m deep. The ground…

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Q: Determine the specific kinetic energy of a mass whose velocity is 30 m/s, in kJ/kg.

A: Given: The velocity of the mass is V=30 m/s. The expression of the specific kinetic energy of the…

Q: A room is heated as a result of solar radiation coming in through the windows. Is this a heat or…

A: Considering the room as a system, the solar radiation coming through the windows will act as the…

Q: 15. Water is being heated in a closed pan on top of a range while being stirred by a paddle wheel.…

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Q: Water is being heated in a closed pan on top of a range while being stirred by a paddle wheel.…

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Q: Three hundred kilojoules of heat is added in a piston cylinder arrangement containing air causing it…

A: Polytropic heat addition and work done relation is used.

Q: Determine the energy transferred by conduction in 31 minutes, between the two faces of a concrete…

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Q: change

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Q: PROBLEM: A hemispherical open tank used for concentration of sulfuric acid (Sp. Gravity=1.25) is…

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Q: A steam turbine is receiving 1014 lbm/hr of steam, determine the HP output of the turbine if the…

A: The power output of the turbine is the product of the mass rate of steam and work done by steam…

Q: Determine the Kinetic energy in BTU of a 7 lbm block moving at a velocity of 85 ft/s

A: given  weight = 7 lb  and velocity ,v=85ft/s

Q: 14.5 litres of gas at 172 MN/m2 is expanded at constant pressure until its volume becomes 130.5…

A: Given data: The initial volume of the gas is V1=14.5 litre=14.5×10-3 m3 The final volume of the gas…

Q: Calculate the total kinetic energy, in BTU, of an object with a mass of 10 kg when its velocity is…

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Q: Consider a river flowing toward a lake at an average velocity of 3 m/s at a rate of 500 m3/s at a…

A: As per expert guidelines we are supposed to answer only the first question of the given multiple…

Q: hp compressor in a facility that-75 operates at full load for 2500 h a year is powered by an…

A: Given data: motor efficiency = 93% = 0.93 No. of operating hours = 2500 h Motor power = 75 Hp Unit…

Q: How much work, in kJ, can a spring whose spring constant is 3 kN/cm produce after it has been…

A: Given: The compression of the spring is x=3 cm. The spring constant is k=3 kN/cm.

Q: During the expansion of a gas in piston-cylinder the relation between the pressure and the volume is…

A: Given data: Polytropic process with polytropic index (n) = 1.2 Initial pressure (P1) = 500 kPa…

Q: 2. What is the net-Work (Wne) of a 1000-kg car travelling at 30 m/s and reducing its speed to 10…

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Q: A gas contained in a vertical cylindrical tank has a volume of [10 + (30/100)] m³. The gas receives…

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Q: Three hundred kilojoules of heat is added in a piston cylinder arrangement containing air causing it…

A: Answer: The work done is 600 kJ.

Q: A hydraulic turbine is used to generate power by using the water in a dam. The elevation difference…

A: Given data: Hydraulic turbine used to generate power in hydroelectric power station Net head (H)…

Q: enlarged by blowing air into it. If the surface tension of the soap solution is 0.0047 lbf/ft,…

A:

Q: Consider a river flowing toward a lake at an average velocity of 22.5 km/hr at a rate of 387 m3/s at…

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Q: Define How to energy change of a system during a process is equal to the net work and heat transfer…

A: First law of thermodynamics said to be "energy cannot be created or destroyed" but it can transfer…

Q: A spring whose spring constant is 200 lbf/in has an initial force of 100 lbf acting on it. Determine…

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Q: Determine the specific potential energy, in kJ/kg, of an object 50 m above a datum in a location…

A: Given data: Height from the datum, h = 50 m. Acceleration due to gravity, g = 9.8 m/s2. The…

Q: Q1/ Electric power is to be generated by installing a hydraulic turbine- generator at a site 120 m…

A: Given data  Available Head (H) = 120 m  Mass flow rate (m˙) = 2400 kg/s   To determine  the power…

Q: Q2/ An automobile engine consumes fuel at a rate of 28 L/h and delivers 60 kW of power to the…

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Q: When is a system a closed system, and when is it a control volume?

A: Closed system: A closed system is defined when a particular quantity of matter is under study. A…

Q: Consider a room with indoor temperature of 28°C and the outdoor temperature of 32°C. Due to the…

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Q: to be enlarged by blowing air into it. If the surface tension of the soap solution is 0.0038 lbf/ft,…

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Q: For a system having a mass of 1 lb whose velocity increases from 50 ft/s to 100 ft/s while its…

A: Given Mass = 1 lb Distance = 50 ft to 100 ft Elevation 40 ft Acceleration due to gravity = 32 ft/s…

Q: 14. 14.5 liters of gas at 172 MN/m2 is expanded at constant pressure until its volume becomes 130.5…

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Q: A soap bubble with a diameter of 2.28" is to be enlarged by blowing air into it. If the surface…

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Q: The force F required to compress a spring a distance x is given by F – F0 = kx where k is the spring…

A: given:initial spring force F0=100Nk=300N/cminitially at a distance x1=0compressed distance x2=1cm

Forms of Energy

Energy is described as the capability to accomplish a task, like the ability to push a block by applying force on it. It is a quantitative property that is used to accomplish work on an object.