discussion summary practice problems power physics Problems practice A typical adult in the United States consumes something like 2000 dietetic calories of food per day. Determine the average power generated by such an adult (assuming he or she is not gaining or losing weight). Determine the cost of operating a 7000 Btu, room-sized air conditioner in New York City for the ...

Read More »# mechanics

## power physics Practice

discussion summary practice problems Practice practice problem 1 A typical adult in the United States consumes something like 2000 dietetic calories of food per day. Determine the average power generated by such an adult (assuming he or she is not gaining or losing weight). solution We have to assume here that all the food energy consumed goes into work on ...

Read More »## power physics Summary

discussion summary practice problems power physics Summary Definition Power is the rate at which work is done (or the rate at which energy is consumed). non-calculus calculus P = ΔW Δt P = dW dt Where P = power W = work t = time Power is the scalar product of force and velocity simplified non-calculus calculus P = F∥v P = Fv cos θ P = F · v Where P = power F∥ = component ...

Read More »## power physics

discussion summary practice problems power physics Discussion Intro Power is the rate at which work is done or the rate at which energy is transfered from one place to another or transformed from one type to another. P̅ = ΔW Δt P = dW dt P̅ = F̅v cos θ P = F · v Power of some things power (W) device, phenomena, process, event gamma ray burster 3.6 × 1039 typical ...

Read More »## Conservation Of Energy Problems

discussion summary practice problems Problems practice The diagram below shows a 10,000 kg bus traveling on a straight road which rises and falls. The horizontal dimension has been foreshortened. The speed of the bus at point A is 26.82 m/s (60 mph). The engine has been disengaged and the bus is coasting. Friction and air resistance are assumed negligible. The numbers on the ...

Read More »## Conservation Of Energy Practice

discussion summary practice problems Practice problem 1 The diagram below shows a 10,000 kg bus traveling on a straight road which rises and falls. The horizontal dimension has been foreshortened. The speed of the bus at point A is 26.82 m/s (60 mph). The engine has been disengaged and the bus is coasting. Friction and air resistance are assumed negligible. The numbers on ...

Read More »## Conservation Of Energy Summary

discussion summary practice problems Summary When objects interact… energy can change form (energy transduction) energy can be transferred (energy transfer) Conservation of Energy A decrease in one form of energy will result in an increase in another form of energy of equal magnitude. ΔE1 = −ΔE2 The total energy of a closed system is a constant. ∑E = ∑E0 = constant Energy can neither be created ...

Read More »## Conservation Of Energy

discussion summary practice problems Conservation Of Energy The law of conservation of energy cannot be derived. Energy is not concrete; it is not a material substance; it is given meaning through the calculation of numbers. A true historical discussion of the law of conservation of energy is best left to the chapters in this book devoted to thermodynamics. The Nineteenth ...

Read More »## Potential energy Problems

discussion summary practice problems Potential energy Problems practice Write something. Write something else. Calculate the gravitational potential energy released by the collapse of the World Trade Center in New York City on 11 September 2001. Each 110 story tower had a mass of about 550,000,000 kg and a height of 415 m (not including the broadcast tower). Compare this to the energy released on 8 March 1993 ...

Read More »## Potential energy Practice

discussion summary practice problems Kinetic and Potential Energy Practice practice problem 1 Write something. solution Answer it. practice problem 2 Write something else. solution Answer it. practice problem 3 Calculate the gravitational potential energy released by the collapse of the World Trade Center in New York City on 11 September 2001. Each 110 story tower had a mass of about 550,000,000 kg and a ...

Read More »