Recent content by ubbaken

but it can't be 2pi/3 rads, cause that isn't the phase, it's the next one equal to -1/2. But I've tried them both. It accepts deg or rad answers.

[FONT="Times New Roman"]An object in simple harmonic motion oscillates with a period of 4.00 s and an amplitude of 9.08 cm. How long does the object take to move from x=0.00 cm to x=5.07 cm? I set up my eqn like this: 0.0908cos(ωt)=0.0507 cos(ωt)=0.583 ωt=56.1 then with ω=90deg I get...

tried that, though I didn't word it that well there it seems. with that logic, I work through to get: -1/2=cos(φ); which gives me 120deg - which isn't in the correct phase, so continuing along the curve until 240deg gives the right phase, but the answer is coming up as incorrect.

What is the phase constant? Use a cosine function to describe the simple harmonic motion. http://capa.physics.mcmaster.ca/figures/kn/Graph14/kn-pic1416_new.png t1=40.0 s and A=20.0 cm I'm really lost on how to get this done. Using x=Acos(ωt+φ); my approach has been to find when...

ah yes, I see now. I was making some incorrect equalities with my angles. Thank you for your help.

That was my first post, I believe.

Sorry, my x' was 'parallel' to the ramp and y' was perpendicular. What I have are: F(normal)=wcosθ and F(push)=wsinθ=(123kg)(9.81m/s/s)sin(26.9deg)=546N But that is incorrect...

The Question: A 123 kg chesterfield is pushed up a frictionless ramp at a constant speed by a delivery person. If the ramp is inclined at 26.9° to the horizontal, what horizontal force must the delivery person apply to the chesterfield...