11. A 56kg weight lifter has to carry a 1000lbs of load 10meters above his current location. Determine the amount of energy needed in kcal. Derive with the formula below, show the cancellation, explain the step by step and DRAW a free body diagram/figure. refer with this: PE1 + KE1 + U1 + WF1 + Q1 + W1 = PE2 + KE2 + U2 + WF2 + Q2 + W2 + E losses.

11. A 56kg weight lifter has to carry a 1000lbs of load 10meters above his current location. Determine the amount of energy needed in kcal. Derive with the formula below, show the cancellation, explain the step by step and DRAW a free body diagram/figure. refer with this: PE1 + KE1 + U1 + WF1 + Q1 + W1 = PE2 + KE2 + U2 + WF2 + Q2 + W2 + E losses.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 54PE: (a) Calculate the energy in kJ used by a 55.0-kg woman who does 50 deep knee bends in which her...

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(a) What is the average metabolic rate in watts of a man who metabolizes 10,500 kJ of feed energy in one day? (b) What is the maximum amount of work in joules he can do without breaking down fat, assuming a maximum eficiency of 20.0%? (c) Compare his work output with the daily output of a 187W (0.250horsepower) motor.
(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?
The food calorie, equal to 4186 JJ, is a measure of how much energy is released when food is metabolized by the body. A certain brand of fruit-and-cereal bar contains 145 food calories per bar. A. If a 71.0 kgkg hiker eats one of these bars, how high a mountain must he climb to "work off" the calories, assuming that all the food energy goes only into increasing gravitational potential energy? Express your answer in meters. H=____________m B. If, as is typical, only 25.0 %% of the food calories go into mechanical energy, what would be the answer to part A? (Note: In this and all other problems, we are assuming that 100%% of the food calories that are eaten are absorbed and used by the body. This is actually not true. A person's "metabolic efficiency" is the percentage of calories eaten that are actually used; the rest are eliminated by the body. Metabolic efficiency varies considerably from person to person.) Express your answer in meters. H=______________m
Question #: 23 If a person who normally requires an average of 12,000 kJ (~ 3000 Cal) of food energy per day consumes 13,000 kJ per day, he will steadily gain weight. How much brisk walking per day is required to work off this extra 1000 kJ? Take the energy consumption rate when brisk walking (at 5 km/h) as 280 W. A. 30 minutes B. 60 minutes C. 40 minutes D. 50 minutes E. 70 minutes
A 65-kg indoor rock climber eats an energy bar that has 500 kilocalories to fuel an afternoon of climbing. If the climber has a typical 20% efficiency for energy used by the body, how many times can the climber scale an 11.8-m wall using the energy provided by the bar? (1.00J = 4.184 cal) A. two timesB. three timesC. twelve timesD. fifteen times
1. The formula for work in thermodynamics is given by PV = W. Suppose that at any pressure, P = h(V + V,") where V is the volume and V, is the initial volume. h and V, are constants. If work is to be maximized, what is the correct expression of maximum work in terms of constants? A. -1/2V. B. -h/2V. C. A(V, + 1)/4V, D. -h/4 E. None of these. A B.
A typical avocado has 180 Calories. If all this energy could be used to lift a bucket of water weighing 40 N, through what vertical distance could the bucket be lifted? (1 calorie = 4.184 J and 1 Calorie = 103 calories) a. 1.72E+6 m b. 3.01E+7 m c. 7.53E+5 m d. 1.88E+4 m
4. A 1500-kg vehicle travelling at 60 km/h collides head-on with a 1000 kg vehicle travelling at 90 km/h. If they come to rest immediately after impact, determine the increase in internal energy, taking both vehicles as the system. Derive with the formula below, show the cancellation, explain the step by step and draw a free body diagram/figure. refer with this: PE1 + KE1 + U1 + WF1 + Q1 + W1 = PE2 + KE2 + U2 + WF2 + Q2 + W2 + E losses.
How much work is needed to lift a bag of groceries that weighs 250N to a height of 4m? A. 1000 Calorie B. 1000 J C. 1000 N D. 1000 kJ
Heating The amount of chemical potential energy stored in one gallon of heating oil is approximately 130 MJ. This is the amount of energy released as heat during combustion. (Note: 1.0 kWh = 3600 kW-sec = 3600 kJ = 3.6 MJ. Verify this equivalency and use it to answer the following question.) a. Suppose that during the winter, heating your home with oil may require an average of 6 gallons of oil per day. Assuming that to be the case, what is the average daily energy consumption? (Express your answer in kWh.) b. If the cost of heating oil is $3.00/gallon, what is the daily cost to heat your home? Use this information to find the cost of heating with oil in units of cents/kWh.
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Riding a bike burns 100 calories per mile. If you ride at 20 miles per hour, what is your average power output in watts? A I also attached the not sure if I have to use Joules or watt. 1 mile = 5280 feet I km = 1000 m %3D %3D 1m = 100 cm 1L= 1000 ml 1 Calorie = 4184 joules %3D 1 kilowatt = 1000 watts %3D 1 kilowatt hour = 3.6 million joules 1 watt = 1 joule per second %3D