7.7 An engineer is considering the development of a small wind turbine (D = 1.25 m) for home applications. The design wind speed is 15 mph at T = 10°C and p = 0.9 bar. The efficiency of the turbine is n = 20%, meaning that 20% of the kinetic energy in the wind can be extracted. Estimate the power in watts that

7.7 An engineer is considering the development of a small wind turbine (D = 1.25 m) for home applications. The design wind speed is 15 mph at T = 10°C and p = 0.9 bar. The efficiency of the turbine is n = 20%, meaning that 20% of the kinetic energy in the wind can be extracted. Estimate the power in watts that

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter7: Work And Kinetic Energy

Section: Chapter Questions

Problem 83P: When jogging at 13 km/h on a level surface, a 70-kg man uses energy at a rate of approximately 850...

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(a) Calculate the energy in kJ used by a 55.0-kg woman who does 50 deep knee bends in which her center of mass is lowered and raised 0.400 m. (She does work in both directions.) You may assume her efficiency is 20%. (b) What is the average power consumption rate in watts if she does this in 3.00 min?
(a) How long will the energy in a 1470kJ (350kcal) cup of yogurt last in a woman doing work at the rate of 150 W with an efficiency of 20.0% (such as in leisurely climbing stairs)? (b) Does the time found in part (a) imply that it is easy to consume more food energy than you can reasonably expect to work off with exercise?
When jogging at 13 km/h on a level surface, a 70-kg man uses energy at a rate of approximately 850 W. Using the facts that the “human engine” is approximately 25 efficient, determine the rate at which this man uses energy when jogging up a 5.0 slope at this same speed. Assume that the frictional retarding force is the same in both cases.
Water falls over a dam of height h with a mass flow rate of R, in units of kilograms per second. (a) Show that the power available from the water is P=Rgh where g is the free-fall acceleration. (b) Each hydroelectric unit at the Grand Coulee Dam takes in water at a rate of 8.50 105 kg/s from a height of 87.0 m. The power developed by the falling water is converted to electric power with an efficiency of 85.0%. How much electric power does each hydroelectric unit produce?
A 72kg boy is surfing and catches a wave that gives him an initial speed of 1.60m/s. He then drops through a height of 1.52m, and ends with a speed of 8.50m/s. How much nonconservative work(in kj) was done on the boy?
A 1700 kg Buick moving at 83 km/h brakes to a stop, at uniform deceleration and without skidding, over a distance of 93 m. At what average rate is mechanical energy transferred to thermal energy in the brake system?
A model aircraft internal-combustion engine produces 10 W of power. How much power is this in (a) lbf·ft/s and (b) hp?
What is the efficiency of a subject on a treadmill who puts out work at the rate of 100 W while consuming oxygen at the rate of 2.00 L/min?
The total mass of a paratrooper - the person and all the gear - is 118kg. the paratrooper jumps out of an airplane. after the paratrooper opens up his parschute he quickly reaches a constant speed of 3.7m/s. what is the rate at which the potential energy of the paratrooper is converted to the internal energy of the atmosphere?
A bicyclist on a flat road expends energy at a rate of 80 W. How many Joules of energy are expended in 5 mins?
A bird (m=250g) is flying through the sky at 10m/s, if the birds total energy is 1000J, what is his height off the ground?