Your car has a flat tire on a deserted road and you can't find the jack. Fortunately, you have a box of enormous plastic bags and a portable leaf blower. You put one of the bags under the car and use the blower to inflate it. The bag easily lifts the corner of the car so that the damaged tire is off the ground. You change the tire and continue on your trip. While the pressure inside the bag never reached more than twice atmospheric pressure, the bag was able to exert a tremendous upward force on the car because
A. the increased pressure was exerted on a large surface area underneath the car.
B. inflating the bag made it spherical and spherical objects are stronger than any other shape.
C. air from the leaf blower was traveling fast and fast-moving air exerts lift forces on anything it encounters.
D. air from the leaf blower was traveling fast and fast-moving air exerts drag forces on anything it encounters.
Answer:A
Your car has a flat tire on a deserted road and you can't find the jack. Fortunately, you have a box of enormous plastic bags and a portable leaf blower. You put one of the bags under the car and use the blower to inflate it. The bag easily lifts the corner of the car so that the damaged tire is off the ground. You change the tire and continue on your trip. While the pressure inside the bag never reached more than twice atmospheric pressure, the bag was able to exert a tremendous upward force on the car because
A. the increased pressure was exerted on a large surface area underneath the car. B. inflating the bag made it spherical and spherical objects are stronger than any other shape. C. air from the leaf blower was traveling fast and fast-moving air exerts lift forces on anything it encounters. D. air from the leaf blower was traveling fast and fast-moving air exerts drag forces on anything it encounters.