Recent content by briteliner

but how? what is r and what is p with the info i am given?

Homework Statement a mass drops from rest without air resistance, starting from coordinates x=xo, y=yo, z=0. compute its angular momentum about origin at time=t. compare it to the torque on the mass. repeat this, but pick your origin for the angular momentum and torque about the point...

okay, so i do that.. and i get that (mv)dv/dx-kx(dv/dx)=0. can i cancel the dv/dx?

Homework Statement The Force is F(x)=Av2/x. find x(t) if x(0)=0 and vx(0)=0 Homework Equations The Attempt at a Solution My issue is that i set this up as mdv/dt=F but when i try to separate the variables i don't know what to do about the v since it depends on x. any suggestions?

ok, but to get the frequency i need to solve the differential equation that i attempted above. how do i go about that?

the force for a spring is just F=-kx. so does F\alpha =k?

ok so after the series expansion F(x)=-F(\alphax)+((\alphax)3)/3!+...) the force depends on the displacement directly. but how does this help me get the frequency?

Homework Statement a particle of mass m moves in one dimension with an applied force Fx=-Fosinh(\alphax) where \alpha and Fo are constants. find the frequency of small oscillations about the equilibrium position. next, find the potential energy function and sketch it. Homework Equations...

if b is the height and a is the width, i get (3(b^3)(x^3))/(y^3)

a triangle, with x and y-axis i think

Homework Statement the moment of area is integral (r^2 dA). With r measured from the origin, use geometry to evaluate this integral in both orders. Homework Equations The Attempt at a Solution Ok so I set up the integral with dA=rdrd(theta) so with r from 0 to r and theta from 0...

i understand that dt is time, but now how to get dt.

Homework Statement Start from this equation: E=(1/2)mvr^2+U(r) and solve for dt. Set up the integral to find the relation between r and t, then carry out the integral in the special case that E=0. Homework Equations The Attempt at a Solution HOW DO I GET DT? DO I HAVE TO...

ok so should i then just throw out the solutions r^n and r^-n since they don't meet the initial condition?

Well Br^-n goes to 0 so A should be a constant or 1 so that the whole expression doesn't go to zero?