Recent content by demonslayer42

(1/2)mv^2 + (1/2)kx^2 = k (1/2)(0.3)(v^2) + 0.0147 = 24 (1/2)(0.3)(v^2) = 23.9853 v^2 = 23.9853/0.15 =12.645 ? That doesn't look right.

I'm sorry, but I don't understand what you are saying. Es = ½kx² (1/2)(24)(0.035)^2 = 0.0147 ? So if this is Es what am I suppose to do with this?

Homework Statement A block of mass 0.3 kg and spring constant 24 N/m is on a frictionless surface. If the block is set into motion when compressed 3.5 cm, what is the maximum velocity of the block? How much is the spring compressed when the block has a velocity of 0.19 m/s? Homework...

omg, I feel so dumb lol yeah that's where I messed up. Instead of (P/I)/(4*pi) I did (P/I*4*pi). Thank you for your help :)

Yes, I think so. 118 = 10 log (I/Io) Io = 10^(-12) so, 118 = 10 log (I/10^(-12)) 11.8 = log (I/10^(-12)) 10^(11.8) = (I/10^(-12) I = 0.6309 w/m^2 Is that correct?

Homework Statement A point source power outputs a power of 100 W. If a decibel reading of 118 dB is heard, what is the distance to the observer. Homework Equations I = P/(4*pi*r^2) The Attempt at a Solution This should be simple, but for some reason my numbers aren't matching up...

That's exactly what I was thinking, but neither my professor nor did the lab manual specify that. Oh actually, I just read the question again and it says : "Estimate" the change in diameter of the rod. Maybe it means I'm not suppose to actually calculate it but make a theoretical guess? Can I...

Homework Statement Find the change in diameter of the metal rod. So I did a lab in class. We heated up a metal rod by putting it in a "jacket" and heating it with steam and it expanded. We were asked to calculate the liner coefficient. Well I did that just fine. I determine that the rod...

Yes, you are right that's what I meant. O.k., I think I'm starting to get the hang of this now thank you.

That's what I was thinking, but if the a = 0 because it's at a constant velocity wouldn't that just mean the sum of my Fx would be 224.8 N ? So in this case Fx = fs ?Is this correct?

But I can't take the sum of Fx because I don't have an acceleration. I'm stuck :(

Homework Statement A 40 kg block slides down arough incline of 35 degrees with a constant velocity. Find the frictional force acting on the block. Homework Equations Fgx = Fg sin theta Fgy = Fg cos theta Fg = mg The Attempt at a Solution Well I drew a diagram and solved for my Fgx...

Because I always do something wrong...You sure it's correct? I'm just really shocked I got it correct it seems to easy i must be missing something.

Homework Statement A 5kg brick on a rope is lowered towards the ground. While the brick is accelerating downward at 1.5m/s^2, find the tension in the rope. What is the reaction force to the upward force of tension acting on the brick?Homework Equations Sum of F = ma w = Fg = mg g = 9.8 m/s^2The...

Well thank you :) I'm trying really hard to learn Physics. It's difficult for me to learn, but it's very interesting.