If you squeeze a bag of air to 80 percent its volume, pressure inside will:?

Question

a) increase by 150 percent b) increase by 100 percent c) increase by 125 percent d) increase by 80 percent e) decrease by 80 percent

Answer 1

Trick question, you need to know how much air is in the bag to start with.  if it's 40% full and you squeeze it to be 80%, then you doubled the pressure...  Understand?

Answer 2

would it go away?  C. i guess

Answer 3

D

Answer 4

increase perhaps

Answer 5

c)

Answer 6

P1V1=P2V2

Let

1*1=P2*.8

P2=1/.8=1.25

%age=125%

Answer 7

Use the formula: PV = constant

i.e. P1*V1 = P2*V2

P2 = P1*V1/V2 = P1 * V1 / 0.8V1 = p1/0.8 = 1.25 P1 = 125% of P1

Answer is C

Answer 8

C)Surely it would increase.

Answer 9

I am making a few assumptions here, but pressure will increase unless you have a leak.

You have in effect taken the volume down to 20% while keeping the contents the same.  50% would be a 100% increase so, 75 percent should equal at pressure increase of 150%, as your packing the same volume into again 1/2 the space.

a)150%?

Sorry you really need a good physics guy, I am using logic

Answer 10

It will increase by 25%, not 125%.  The question is badly written.