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omg the first question is killing me! well, is the Internation Space Station stationary or no? is it moving? if so, to what direction? i am trying to derive an equation using m1v1+m2v2=m1v1'+m2v2' (conservation of momentum). but i figure this equation alone is not enough. i am...

hi, i am doing a lab about analyzing one-dimensional collisions. There are two synthesis questions that i don't know how to even begin with. 1. How could the results of this investigation be applied to determine the mass of a sealed refuse bag on board the International Space Station...

NotMrX, i don't understand what you are saying. What does frequency have to do with my question??

it's true that a less stiff spring will undergo greater displacement. i don't know what 'vees' are, though. anyway, so which one do you think will undergo faster damping? I think it's the stiff one because it tends to stay at its equilibrium state and does not easily affected by...

ya. what you said is right. it's like how a pendulum comes to rest. in this case, though, it's not the pendulum, but two springs with different stiffness. Which one will undergo a faster damping? a stiff one or less stiff one?

hi, this is a question in my textbook that i don't get: Does a stiff spring undergo slower or faster damping than a less stiff spring of the same legth? i think the stiff one would undergo a faster damping because it tends not to move even though there's a mass attached to it, doesn't it...

ya, but I am supposed to solve the problem using the concept of conservation of ENERGY! and i know that you can't subtract energy factors. read what I've asked for.

hi, I am learning about how to solve energy problems using the law of conservation of energy. I am okay with most of the problems, but I am confused about how to solve the ones involving the work done by frictional force. For example: A clerk pushes a filing cabinet of mass 22.0 kg across the...

k. thnx a lot. i think i kinda understand it now...

oooooooooooh, i get it.- so FBD is the answer! but why is Fn zero again? is it because she "barely remains in contact with the seat"? then, it's not the same as when a person feels weightless, is it? in what other situations is like this?

i don't quite get it "N=0" what does N rep? and where did you get the equation "W-N = Fc <centripetal force>" isn't the formula for centripetal force, (mv^2)/r? and how do know if that equals mg? ugh. this stuff is pretty new to me and it's confusing me. :'(

omg. it's the same problem that I am working on right now. but i need to solve it using the concept of conservation of energy. anyone knows how?

so you think gravitatial potential energy is simply E_g=mg delta y? that's what i thought at first, but shouldn't we exclude the height of the coin that we are lifting up and make delta y= y/N(N-1)? it's what I said at the beginning. *y/N=the height of one of the coins.

well.. I am supposed to derive an equation for the situations using the variables given (like m, g, y, and N). "Part a asks "approximately," you just need to consider how much work it takes to lift a mass up to the top of the stack." -robb, i don't really understand what you are getting at...

hi, I came across a question in my physics textbook that I didn't get, so I was hoping that you guys could help me out a bit. :smile: Here's the question. It's about gravitational potential energy, by the way. ** On your desk you have N identical coins, each with a mass m. You stack the...