# Recent content by Ben Harris

1. ### I Piston in a tube connected to a vessel filled with air

Hi there, i have been working with a problem the past few days and have a hard time with some of the assumptions being made. The problem involves a piston in a tube which is connected to a vessel filled with air. The air behaves as an ideal gas to which the product PV^ζ is a constant. The...
2. ### Work done on a meteor approaching the Earth -- Is it +ve or -ve?

Ohhhhhh Yes!, that is correct.......... it will be negative! Thank you for making me work for the answer :)
3. ### Work done on a meteor approaching the Earth -- Is it +ve or -ve?

Thanks Kuruman, So if the vectors of F & Δs are opposite (180) then the result is negative when using ΔW = |F| |Δs| cos 180. I think i was getting confused between the direction of motion vs the change in position vector. Thank you for your help!
4. ### Work done on a meteor approaching the Earth -- Is it +ve or -ve?

Hi all, i am trying to figure out if work done by gravity is positive or negative on an approaching meteor, I have used W(1->2) = integral (1->2) F(gravity) dot dr. and got a result of (GMem/r2) - (GMem/r1). Were G is gravity, Me is earth mass, m is meteor mass and r1, r2 are initial and...