A 6.86 N mass mearsures 5 cm in width, 10 cm in length, and 2 cm in height. It is resting on a wooden floor.
a. What pressure does it exert on the floor?
b. If it is turned so that the 5 cm and 2 cm sides are in contact with the floor, will the pressure on the floor be increased or decreased?
What volume will a gas occupy at 975 millimeters of pressure if the gas occupies 525 cubic cm at 650 cimllimeters of pressure?
A container with equal sides of 10 cm is filled with 500 grams of fluid.
a. What is the force in newtons on the bottom of the container?
b. What is the density of the fluid in per cubic cm?
c. what is the pressure on the bottom of the container in newtons per square cm?
2006-11-29 10:53:40 · 5 answers · asked by typicalbutiluvyou 2 in Science & Mathematics ➔ Physics
What's serious, serious, serious to you doesn't even make my scale of serious. I think we have a problem....
2006-11-29 11:03:06 · answer #1 · answered by clarity 7 · 1⤊ 1⤋
I am also wondering why do you say you require serious help, but I try to guess!
q. 1 a Pressure, P1 = 6.86/(.010x.05) = 1372 N/m^2 = 1.372 kPa
Pascal is SI the unit of pressure newton/m(squared)
1 b P2 = 6.86/(.02x.05) = 6860 Pa = 6.86 kPa
P1 and P2 are the pressure exerted by the mass because earth attracts it. and this acts only downward, it dos not include the weight of the column of air above the mass. This will be so even if we put the mass in a chamber and evacuate the chamber
.975 V = 525x650 assuming the temeperature to be the same
V = (525x650)/975 350 ml
Force applied by the fluid because of its weight = .5x9.8 = 49 N
Density .5/(.1x.1x.1) = 500 Kg/m^3
Pressure, P3 due to weight of the fluid = 49/100 = 0.49 N/cm^2
In kPa, P3 = 4.9 kPa But we will say the total pressur will be this plus the pressure due to atmosphere which is 100 kPa
Total pressure will be 104.9 kPa. I think this is where you require help. Am I right?
Pressure in a fluid is altogether a diferent concept. It is because of the randomly moving molecules of the fluid and has nothing to do with the attraction by earth. It isi another matter that bercause of the equilibrium, atmospheric pressure is equal to the weight of teh coluimn of air on every square metre of earth. Secondly, pressure in a fluid gets transmitted in all directions not just downwards. That is why we consider pressure in a fluid as scalar quantity. Also see that if you put the container in a chamber and evacuate it the fluid will not remain in liquid state.
Further queries are welcome!
2006-11-29 11:50:40 · answer #2 · answered by Let'slearntothink 7 · 0⤊ 0⤋
A: The pressure is 6.86 N / 50 square cm = .1372 N / square centimeter.
B: The presure will be 6.86 / 10 square cm = .686 cm / square, so it would increase.
The volume would be 525 * 650 / 975 = 350 cubic cm.
1 newton = 101.972 grams, so 1 gram = .0098 newtons, so 500 grams = 4.903 newtons.
The density is 500 grams / 1000 cubic cm = .5 grams / cubic cm.
The pressure is 4.903 newtons / 100 sq cm - .04903 newton / square cm.
2006-11-29 11:02:18 · answer #3 · answered by kimmyisahotbabe 5 · 0⤊ 0⤋
It appears we need to have a talk about the meaning of the word "serious."
2006-11-29 10:56:56 · answer #4 · answered by KnowhereMan 6 · 1⤊ 1⤋
Do your own school work. No cheating.
2006-11-29 11:03:04 · answer #5 · answered by 40oz2freedom 2 · 1⤊ 1⤋