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Determine the time in hours to plow a 3-ha field using a 15-cm animal-draw plow at a speed
of 4 kph and efficiency of 75 %.
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- Problem 2) An electric lawn mower runs on 1000 watts of electrical power input. The same mower can cover a small yard of 2500 sq ft in 20 minutes (20 minutes is 1200 seconds). If the effective amount of energy required to cut the 2500 sq ft of grass is 420,000 joules. What is the efficiency of the electric lawnmower? Problem 3) The small wheel in the picture has a radius of 1 inch and the large one has a radius of 8 inches. The yarn that connects them travels at a speed of 12 inches/second. If the small wheel rotates at 800 RPM, what is the rotational speed of the large wheel? Radius : 8 inches Radius : 1 inchAn 800-MW electric power plant has an efficiency of 30%. It losses its waste heat in large cooling towers. Approximate how much waste heat (in MJ) is discharged to the atmosphere per second? 240. 560. 800. 1 200. 1 900.A large electrical power station generates 1050 MW of electricity with an efficiency of 37.0%. (a) Calculate the heat transfer (in J) to the power station, Q, in one day. (b) How much heat transfer Q. (in J) occurs to the environment in one day? (c) If the heat transfer in the cooling towers is from 35.0°C water into the local air mass, which increases in temperature from 18.0°C to 20.0°C, what is the total increase in entropy (in J/K) due to this heat transfer? J/K (d) How much energy (in J) becomes unavailable to do work because of this increase in entropy, assuming an 18.0°C lowest temperature? (Part of Q. could be utilized to operate heat engines or for simple space heating, but it rarely is.) to Additional Materials O Reading CS Scanned with CamScanner
- hydro-electric power plant having 50 sq.km reservoir area and 100 m head is used to generate power. The energy utilized by the consumers whose local is connected to power plant during a 5 hour period is 13.5 10 kW. The overall generation efficiency is 75%. Find the fall in height of water in the reservoir after 5 hours periodAs a gasoline engine is running, an amount of gasoline containing 13,600 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,400 J of work. (a) What is the engine's efficiency (in percent)? % (b) The burning gasoline has a temperature of about 4,100°F (2,500 K). The waste heat from the engine flows into air at about 90°F (305 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures? Need Help? % Read ItAs a gasoline engine is running, an amount of gasoline containing 11,700 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,900 J of work. (a) What is the engine's efficiency (in percent)? % (b) The burning gasoline has a temperature of about 4,700°F (2,900 K). The waste heat from the engine flows into air at about 82°F (301 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures?
- You use a quantity of fuel with a total energy content of 19.02 MJ to power an engine. If the average output of the engine over 2 hours was 2.12 kW, what is the efficiency of the engine?In a hydroelectric power plant, water flows from an elevation of 400 ft to a turbine, where electric power is generated. For an overall turbine–generator efficiency of 85 percent, determine the minimum flow rate required to generate 100 kW of electricity.Problem 3: Suppose a subject on a treadmill puts out work at the rate of 95 W while consuming oxygen at the rate of 2.00 L/min. Assume this rate of oxygen consumed corresponds to a power output of 700 W. What is the percent efficiency of the subject? 7 (%) = ||
- The steam supplied to an engine liberates 5000 J of heat. If the engine efficiency is only 40 percent, to what height a body of mass 10 kg can be lifted using the work output from the engine?The steam supplied to an engine liberates 5000 J of heat. If the engine efficiency is only 40%, to what height a body of mass 10 kg can be lifted using the work output from the engine?A heat engine extracts 55 kJ from the hot reservoir and exhausts 40 kJ into the cold reservoir. What are (a) the work done and (b) the efficiency?