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It is currently popular for automobiles to use 10% ethanol / 90%gasoline mixtures (‘gasohol’) as fuel. According topopular consensus the main benefit of gasohol use is that it“reduces our dependence upon foreign oil.” Test thisassertion by making some elementary calculations. Our analysis willunrealistically ignore engine maintenance issues associated witholder automobiles (such as gasket and seal hardening), the addedfuel consumption necessary to produce grain used as a feedstock inethanol production, the incremental food price increases associatedwith a reduction in grain stocks, and many other important effects.Gasohol use typically reduces average fuel economy by approximately15% and effectively leaves fuel prices unchanged.
Determine the ‘break-even’ fueleconomy ratio – that is, find the ratio of the gasoline to gasohol fuel economy for two vehicles to use the same amount ofpure gasoline when driven the same distance?
For exercise, a 60 kg athlete runs up a 10-m high hill in 30 seconds. Assume the efficiency of the human body is 25%. Determine her metabolic power
The Mariana trench is located in the Pacific Ocean at a depth of about 11 000 m below the surface of the water. For comparison, determine the weight of a jetliner whose mass is 8.19 × 105 kg
The spring balance is reasonably accurate for determining the load mass, Explain how to use the Workin = Workout principle to verify the mass of the spring balance
The distance between a loudspeaker and the left ear of a listener is 1.60 m. compute the time required for sound to travel this distance if the air temperature is 20° C.
A narrow beam containing red (660 nm) and blue (470 nm) wavelengths travels from air through a 2.60 cm thick flat piece of crown glass and back to air again. At what angles do the the two colors emerge from the glass
A construction hoist exerts an upward force of 500 N on an object with a mass of 50 kg. determine the power it expended to lift the object vertically for 10 seconds under these conditions
q1. suppose the gravitational force between two massive spheres is 100 n. if the distance between the spheres is
The wheel of a racing car is rotating at 200 rpm at a given instant of time. In the next minute it makes 100 revolutions. The angular acceleration of the wheel is
If the energy that goes into evaporating one kilogram of water from Lake Michigan at 22.0 oC, how high (in m) would it be lifted
A harmonic wave in a wire has amplitude 7.07 mm, wavelength 2.61 m, and frequency 254 Hz. What is the propagation speed of the wave
I once observed a woman on an airplane at night with a camera. As we flew low over Washington DC she was impressed with the view of the city lights in the dark. She stood back in the aisle and tried to take the picture by the window using her flash. ..
A 62 kg skier coasts up a snow-covered hill that makes an angle of 25° with the horizontal. What is the magnitude of the kinetic frictional force
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