2 m 5 m/s B k₁ = 200 N/m wwwwwwww A
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The 8-kg block is moving with an initial speed of 5 m/s. If the coefficient of
kinetic friction between the block and plane is uk = 0.25, determine the maximum compression
in the spring when the block momentarily stops.
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- Q3) A compressor, requiring 90 kW is to run at about 250 r.p.m. The drive is by V-belts from an electric motor running at 750 r.p.m. The diameter of the pulley on the compressor shaft must not be greater than 1 meter while the centre distance between the pulleys is limited to 1.75 meter. The belt speed should not exceed 1600 m/mi. Determine the number of V-belts required to transmit the power if each belt has a cross-sectional area of 375 mm² density 1000 kg/m and an allowable tensile stress of 2,5 MPa. The groove angle of the pulley is 35°. The coefficient of friction between the belt and the pulley is 0.25.1.) A hand pump is used to inflate a bicycle tire to a gauge pressure of 70 psi. a) How much work must be done if each stroke of the pump is an adiabatic process and what is the final temperature of the gas? b) We inflate the tire in two steps: (i) an isobaric compression and (ii) an isochoric increase in temperature. Calculate the work done by gas/"us" and/or heat added/removed during the two steps! Is this a viable alternative to the adiabtic compression Explain! Atmospheric pressure is 1 atm, the air temperature is initially 25° C, and the volume of the air in the tire remains constant. Useful values: A bicycle tire is 26 in diameter and has a cross-sectional area of 2 in² [1 in = 2.54 cm]. 1 lb corresponds to a mass of 0.445 kg. c) For Take-Home only Solve the questions in a) and b) in terms of the initial pressure P₁ = P*, the final volume Vf = V* and the pressure ratio K = Pf/P*!1- A steam stripper is used to help removing wallpapers. It comprises of a tank of waterwith an electrical heating element. To generate steam, from which a long rubber tubeconveys the steam to the head which contact with the wallpaper to be removed.(i) The power rating of the electrical heating element is 2 KW, and the tank holds about3 liters of water. Estimate the time it would take from switching the power on tosteam to be generated. (ii) Once steam has started to be produced, estimate how long you could workcontinuously before having to refill the tank. Assume that all water initially in thetank can be evaporated into steam. Also, neglect any heat loss from the tank.Data :Room Temperature 20 oCHeat capacity of water, Cp 4.19 KJ kg-1 K-1Latent heat of vaporization of water at 100 oC, hfg 2257 KJ kg-1(iii) Stream is to be condensed in the condenser of a steam power plant at atemperature of 50 oC with cooling water from a nearby lake which enters the tubesof the condenser at 18 oC at…
- 3. Please calculate the annual electricity production of a wind farm with 20 turbines. The annual mean wind speed is 7 m/s and diameter of the blades is 20 m. If we assume power consumption of a person is 3,000 kWh, about how many people will this energy support? Annual electricity production (KWh) = K Vm³ At T Where: - - - K = 3.2 (factor based on turbine performance) Vm= annual mean wind speed (m/s) At = swept area of turbine (m2) T = number of turbines Suitable for medium- to large-scale wind turbines (> 200 m2 swept area)A steam turbine is operated under the conditions shown in the figure.Define:a. steam flow rate (kg/min) to produce 1000 kW powerb. actual steam rate (kg/kWh)!c. turbine efficiencyd. What type of steam turbine belongs to this?A wind turbine gives the following data: Blade length= 57.5 m. Wind speed = 13 m/s Air density = 1.225 Kg/m3 Power coefficient = 0.45 Assuming equal efficiencies for gearbox and generator, If the Power output from wind turbine, P is 1.9 MW, then find
- Steam leaves an industrial boiler at 645.3kPa and 151.2°C. A portion of the steam is fed through a throttling calorimeter and released to the atmosphere when the calorimeter pressure exceeds 104.3kPa. If the calorimeter's steam temperature is 113.8°C, a. What is the amount of moisture that is escaping from the boiler container? Show unit analysis & conversion. b. Calculate the mass of the saturated vapor if the mass of the saturated liquid is 15kg. Show unit analysis & conversion. @645.3kPa and 151.2°C: hf = 624.56kJ/kg hfg =2123.3kJ/kg @104.3kPa and 113.8°C: h2=2506.7kJ/kgStep by step solution please thank youuuGiven • 1 million people in Hong Kong using low-flush toilet and low-flow shower head.• 1 million leaky toilet and Faucet. Energy needed to treat waterAverage energy use for water treatment drawn from southern California studies is 652 kWh per acre-foot (AF), where one AF = 325,853 gallons.Thermal Energy in CoalThe thermal power plants consume about 0.45 kg of coal per kWh.Energy output/fire power plantA typical 500 megawatt coal power plant produces 3.5 billion kWh per year.CO2 EmissionTaking coal to contain 50 percent carbon, which combines with oxygen during burning to form CO2, we can arrive at 1.83 kg CO2 for every 1 kg of coal burned. Find 4. How many African children (1 liter/kid/day) we can support?
- Hi please show calculations or diagrams if required thank youGiven • 1 million people in Hong Kong using low-flush toilet and low-flow shower head.• 1 million leaky toilet and Faucet. Energy needed to treat waterAverage energy use for water treatment drawn from southern California studies is 652 kWh per acre-foot (AF), where one AF = 325,853 gallons.Thermal Energy in CoalThe thermal power plants consume about 0.45 kg of coal per kWh.Energy output/fire power plantA typical 500 megawatt coal power plant produces 3.5 billion kWh per year.CO2 EmissionTaking coal to contain 50 percent carbon, which combines with oxygen during burning to form CO2, we can arrive at 1.83 kg CO2 for every 1 kg of coal burned. Find 3. How much CO2 we can reduce?1. The mean effective pressure of an engine running at 300 rpm is 500 kPa. What is the indicatedpower if the engine has bore of 250 mm x 450 mm. Select the correct answer below: A. 110.5 kW B. 150 kW C. 200 kW D. 182. 2 kW 2. In a certain process, entering is 1500 KJ/kg and 150 m/s. If the energy leaving is 12000 Kj/kg/ Determine the velocity at exit. Select the correct answer below: A.) 145 m/s B. 1020 m/s C. 789 m/s D. 978 m/s
