Question

Pressure and Density Question 14: Three students are spending the afternoon in the park, sitting by the pond, and applying their newly found knowledge about pressure. Anne says: “The pressure on the surface of the pond must be the same as that on the surface of the little puddle next to me”. Bob disagrees: “The pressure cannot be the same, since the surface area of the puddle is so much smaller. The pressure on the puddle must be bigger”. Chris says: “But there is much less air above the puddle than above the pond, so the pressure on the puddle must be smaller.” For each student's answer state whether it is wrong or right and explain why. Anne: Bob: Chris:

Answer 1

Solution in the uploaded images

Solution Density of our = cair 11 Ilair در مسک Q 14. Apuddle Append. Pressure above any sacfare Force area. air above the are Force = weight Volume air cathe colume x lair Force Reight x Cair & Ana - Teoriat cheightx pair Pressure height & Anfax fair Anh Pressure = height (h) x Lair Amor From above derivation we can see height and alensity of aur is same for pond & puddle therefore pressure is some above both. Anne: Her statement is correct proved above. Pressure is force acting on a unit area, which is same, hence to his statement is wrong. chaiso Even the less aur in the cellum calumn but force arting per unit area is same. Bobi

a15 are a Surfore g pond is much greater than puddle Apond » Apuddle. calles calumn above pond and puddle will be 016 Height of the same. than volume of 217 volume of calumn above pond as much larger column above puddle, as shown in figura Upond >> Upuddle understood the solution!! Hit like if you