luhmama

18.02.2020 • 

Physics

In the process of changing a flat tire, a motorist uses a hydraulic jack. She begins by applying a force of 45 N to the input piston, which has a radius
r1
As a result , the output plunger , which has a radius
r2
applies a force to the car. The ratio
r2/r1
has a value of 8.3. Ignore the height difference between the input piston and output plunger and determine the force that the output plunger applies to the car.

Ответ:

tyliahhayes

05.12.2021

Physics

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Only 30% of gasoline is used for useful work in that engine

Now it is given that 3 Gal gasoline is used in the car

So the actual gasoline used by engine will be

energy content of gasoline will be

Energy consumed by the engine will be given by

now let say engine applied F force against the air drag to move the car

So work done by the engine = energy consumed by it

so engine must have to apply 720 N force

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