Recent content by Dreaming

Just Newton's first and second laws. F=ma, v=x/t, a=v/t, and some related equations.

Here is the exact wording: Because of Mexico City's altitude the acceleration of gravity there is lower than that in Tokyo by about 0.01 m=s2. Suppose a high-jumper has a mass of 72 kg. (b) Assume that he is able to jump with the same initial vertical velocity in both locations, and that...

voko, I do not need energy. Energy is not involved in this particular problem. Just acceleration, force, mass.

Homework Statement Gravity varies in two different places by 0.01 m/s^2. The jumper has a mass of 72 kg. What is the difference in jump height in each location? I have a couple of height measurements, but I'm pretty sure they are irrelevant because I am looking for a difference (and the...

Thank you! I see that I have been over-complicating it.

Yes, I'm pretty sure the F(air) is constant for the purposes of the problem. So how about this: F(air) + F(weight) = ma + mg where "a" is the upward acceleration of the helicopter. BUt now I have too many variables to solve just for velocity. I have one Δv/Δt for a and one Δv/Δt for g...

Simple "what is velocity at time t" problem Homework Statement A helicopter is lifting off. The only forces are air (up) and gravity. What is the vertical speed at time t if it took off at time t=0? Homework Equations g = F(air)/m, g=Δv/Δt The Attempt at a Solution F(air)/m =...