Recent content by nehcrow

Thank you so much!

This is a simple question but I really need to know why: why is the alternate form of arccosh(x) = log(x + sqrt(x^2 - 1)) and not log(x - sqrt(x^2 - 1)) How do I justify the plus/minus sign? I need to know this ASAP, thanks.

Thanks!

if you have the equation: x(t) = Acos(ωt + ϕ) and you have the following information: A 200 g block hangs from a spring with spring constant 10 N/m. At t = 0s the block is 20 cm below the equilibrium position and moving upward with a speed of 100 cm/s. The answers give a short method of...

m*u = 54.77

Homework Statement See attached image Homework Equations Momentum equations. Kinetic energy equations. The Attempt at a Solution I attempted to write out the momentum equation and the kinetic energy equation and tried to resolve the two equations (which became a quadratic) but I...

Is it possible to find the coefficient of friction just by looking at a graph? A velocity-time or acceleration-time graph which models a particle going up a ramp and down a ramp.

BUMP, need help ASAP

Rotational kinetic energy? Sorry, I'm really lost when it comes to rotational mechanics, I need people to spell it out for me :(

OK, so kinetic energy and gravitational potential energy. I got the first part correct, Ug = Mg(y - a) but the 2nd part... not so much :\

Homework Statement Check attached image. Homework Equations The rotational motion formulas Ug = mgh The Attempt at a Solution Have no idea unfortunately :(

Sorry to bother you again but you could you mind setting up the equations? I'm still not getting the right answers :(

Thanks a lot! I get it now... conservation of momentum, why didn't I think of that :P

I think Question 3 is C.

Homework Statement In a fireworks explosion two fragments are ejected horizontallly back-to-back as the shell explodes 200m above the ground. One fragment (A) has a mass of 0.5kg while the other (B) has a mass of 1.0 kg. (a) If the total energy of the system before the explosion is 1.0kJ...