How far could you pedal a bicycle at 15km/hr on the energy in 2.2 gallons of gas? ( 1 gallon of gas has a mass of 3.2kg.)
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Fuel: Gas,
Energy in 1g of Fuel (in kJ): 44.
Activity: Cycling at 15/km/h,
Metabolic power(W) of 68kg individual: 480
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Assuming a typical efficiency for energy use by the body, how many slices of pizza must you eat to walk for 3.0h at a speed of 5.0 km/h? Assume that your mass is 68 kg,metabolic power of 68 kg individual walking at 5 km/h is 380 W , and the energy content of slice of pizza is 1260 kJ. Number of Slices of pizza=---------
At high speed, the main retarding force on an automobile is air drag. We haven’t specifically studied air drag yet, because it’s quite simple. The drag force is very well approximated as Fdrag = γv^2 where γ depends on the shape and size of the car. Consider a car with γ = 1.9N/ (m/s)^2 and an engine that develops a maximum power s of 75 kW. (Remember, this means that the engine does 75 kJ of work per second.) (a)...