A student evaluates a weight loss program by calculating the number of times she would need to climb a 13.0 m high flight of steps in order to lose one pound (0.45 kg) of fat. Metabolizing 1.00 kg of fat can release 3.77 x 10) of chemical energy and the body can convert about 21.8% of this into mechanical energy (the rest goes into internal energy.) HINT (a) How much mechanical energy (in J) can the body produce from 0.450 kg of fat? (b) How many trips up the flight of steps are required for the 70.0 kg student to lose 0.450 kg of fat? Ignore the relatively small amount of energy required to return down the stairs. trips

A student evaluates a weight loss program by calculating the number of times she would need to climb a 13.0 m high flight of steps in order to lose one pound (0.45 kg) of fat. Metabolizing 1.00 kg of fat can release 3.77 x 10) of chemical energy and the body can convert about 21.8% of this into mechanical energy (the rest goes into internal energy.) HINT (a) How much mechanical energy (in J) can the body produce from 0.450 kg of fat? (b) How many trips up the flight of steps are required for the 70.0 kg student to lose 0.450 kg of fat? Ignore the relatively small amount of energy required to return down the stairs. trips

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

Gasoline yields 4.8 x 107 joules per kg when burned. The density of gasoline is approximately the same as that of water, and 1 gal = 3.8 L. How much energy does your car use on a trip of 100 mi if you get 25 mi per gallon? A) 7.3x 108 J B) 3.7 x 108 J C) 4.6 x 108 J D) 6.2x 108 J
Problem 1: Suppose a man does 35.5 kJ of work with an efficiency of 4.95 %. How much food energy, in kilocalories, will the man metabolize in the process? AU = |
3.5x10^7 J of heat transfers into an engine. If 2.1x10^7 J of work is performed what is the efficiency of the engine? How much heat is lost to the environment?
If you drop a piece of ice on a hard surface, the energy of impact will melt some of the ice. The higher it drops, the more ice will melt upon impact. Find the height from which the a block of ice should ideally be dropped to completely melt if that falls without air drag. [Hint: Equate the joules of gravitational potential energy to the product of the mass of ice and its heat of fusion (in si units, 335,000 J/kg. Do you see why the answer doesn't depend on mass?] Express your answer to two significant figures and include the appropriate units. B: Does the answer depend on mass?
28 J of heat energy is transferred into an ideal gas and 48 J of work is done on the gas. What is the change in thermal energy, in Joules?
The Joule (J) and calorie (cal) are both units of energy. In the U.S., the energy provided by food is given on product labels in nutritional calories (NC). 1 NC is the same as 1 kilocalorie (kcal). In England, the energy provided by food is given in kilojoules (kJ). A can of soup in england has the following nutritional information on the label: 385 kJ of energy per 275.0 mL of soup. In the U.S., the same nutritional information would be given in NC per cup of soup. How many NC per cup does the soup provide?
If the energy conversion efficiencies in a 3 step process are 30% for the first step, 40% for the second, and 20% for the third, the overall efficiency (step one to end) is about: 50% 10% 2% 90% 20% 00000
If I add 12,183 J of energy to an ideal gas inside a balloon causing the internal energy to increase by 5185 J, how much work is done on the environment by the gas as the balloon expands?
Suppose that in one year a country produces 2.77 × 10'' kilowatt-hours (kWh) of electrical energy from 4148 hydroelectric plants (1.00 kWh = 3.60 × 10° J). On average, each plant is 90.0% efficient at converting mechanical energy to electrical energy, and the average dam height is 50.0 m. At 2.77 x 10!1 kWh of electrical energy produced in one year, what is the average power output Payg per Pavg W %3D hydroelectric plant? What total mass of water m flowed over the dams during that year? m = kg What was the average mass of water mavg per dam that provided the mechanical energy to generate the electricity? mavg kg What was the average volume of water Vavg per dam that provided the mechanical energy to generate the electricity? (The density of water is 1000 kg/m³.) Vavg m %3D A gallon of gasoline contains 4.50 × 10' J of energy. How many gallons n of gasoline did the 4148 dams save? n = gal MacRook Pro
A gas is compressed inside a cylinder. An average force of 45 N acts to move the piston 4.7 m. During the compression, 85 J of heat are conducted away from the gas. What is the change in internal energy of the gas? Calculate answer to one decimal.
When one gallon of gasoline is burned in a car engine, 1.19 x 108 J of internal energy is released. Suppose that 1.00 x 108 J of this energy flows directly into the surroundings in the form of heat. If 6.0 x 105 J of work is required to make the car go one mile, how many miles can the car travel on one gallon of gas?
Explain with the formulas please