A tornado passes in front of a building, causing the...

A tornado passes in front of a building, causing the pressure to drop there by 18% in 1 second. Part A If a door on the side of the building is 5.8 feet tall and 3 feet wide, what is the net force on the closed door. Express your answer to two significant figures and include the appropriate units.

Transcript

00:01 Hello, in the question we have given that a tornado passes in front of a building causing pressure drop there by 18 percentage in one second.

00:11 If door on side of building is 5 .8 feet tall and 3 feet wide, what is the net force on the closed door? so we will say that net force will be equal to force inside minus force outside.

00:29 So from here we will just represent it in this way net force is equal to force inside minus force outside so we we have one relation between force and pressure we know that pressure is equal to force per unit area so from here we will get the force to be equal to pressure times area so we will just use over here so it will be force net force will be equal to this will be p pressure is inside my times area times pressure outside times area now we don't know what is the pressure outside we can say that the pressure inside is one atmosphere we can consider but pressure outside we don't know but it has been mentioned that it is reducing by 18 percentage so we have one relation that is p out is equal to 18 percentage of p in so from here p out will be equal to 0 .18 times p in so we will just plug the value over here so we will get f net will be equal to p i n times a minus p out p out is 0 .18 times p i n that is pressure inside times area so we will get this as 0 .82 times pressure inside into area so we will get this as 0 .82 times pressure inside into area so we need to find out the area.

02:09 Now area is what height into width because height and width of the door is given.

02:14 So i have written this dimensions.

02:16 So now height.

02:18 So height and width is given in feet...

Question

A tornado passes in front of a building, causing the pressure to drop there by 18% in 1 second. Part A If a door on the side of the building is 5.8 feet tall and 3 feet wide, what is the net force on the closed door. Express your answer to two significant figures and include the appropriate units.

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