If you have a flat tire and need to pump up the tire on your car with a hand pump, what force do you have to apply to the pump handle? Assume the air pressure in your tire will be 20 lb/in2, that is 1.1 KPa (138,0000 N/m2).Let the air pump have a cross-section that is 5 cm in diameter. It depends on the weight of the car. About 270 N when the tire is full, not much when you start pumping on the empty tire. About 270 N for as long as it takes from the beginning. Just a few newtons until you are satisfied with how full the tire is because of the hand pump.

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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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If you have a flat tire and need to pump up the tire on your car with a hand pump, what force do you have to apply to the pump handle? Assume the air pressure in your tire will be 20 lb/in², that is 1.1 KPa (138,0000 N/m²).

Let the air pump have a cross-section that is 5 cm in diameter.

		It depends on the weight of the car.
		About 270 N when the tire is full, not much when you start pumping on the empty tire.
		About 270 N for as long as it takes from the beginning.
		Just a few newtons until you are satisfied with how full the tire is because of the hand pump.

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