Recent content by eriadoc

Homework Statement An ideal gas follows the three-part process shown in the figure. At the completion of one full cycle, find the net work done by the system. Homework Equations W=P*deltaV; Total Work = Wab+Wbc+Wca A=1/2bh The Attempt at a Solution Work done from C to A is zero, because...

Homework Statement Two batteries and three resistors are connected as shown in the figure. How much current flows through the 6.0V battery when the switch is closed? How much current flows through the 9.0V battery when the switch is closed? How much current flows through the 6.0V battery...

This is a conservation of momentum problem. Treat the child as a point mass on the rim of a circle to find the child's moment of inertia and then add it to the MGR to find total I.

That did the trick, thanks! And now I understand what I was doing wrong. I was conserving energy as if it were an elastic collision, thus setting E_i to mgh and E_f to .5mv^2 + .5kA^2. I appreciate the help!

Appreciate it. several of my classmates are trying as well, but none of us seem to get it.

This was a test question that I missed. The professor released the answer key so we could study for the final (which is this evening), and the answer is 5.97cm. At any rate, 6.97 was not a choice.

That was way too composed. Kudos to you, sir.

OK, turns out my instructor screwed up on the answer key and put 66 degrees as the answer, thus confusing everyone in his class. It's zero, as we all thought. Disregard this post.

Homework Statement A man wishes to pull a crate 15m across a rough floor by exerting a force of 100N. The coefficient of kinetic friction is 0.25. For the man to do the least amount of work, the angle between the force and the horizontal should be: Homework Equations W=Fd; frictional...

Homework Statement A mass of .5kg is resting on a vertical spring with a force constant of 55N/m. A mass of .25kg is dropped from a height of 12 cm onto the larger mass and sticks to it. What is the amplitude of the resulting oscillations? Homework Equations p=mv; m_1v_1 + m_2v_2 =...

Gah! So close! Thank you very much.

Working with circular motion ... Homework Statement Jill of the Jungle swings on a vine 6.9m long. What is the tension in the vine if Jill (63-kg) is moving at 2.4 m/s when the vine is vertical? Homework Equations T=mgsinθ Fc=m(v^2/r) The Attempt at a Solution T = (63)(9.81)...

Got it! Thanks for the help!

OK, I'm still hopelessly lost, but here's what I've done to try and find the vectors: Vector A = Ax+Ay = 9m/s Ax = -6.36m/s Ay = 6.36m/s Vector B = Bx+By Bx = 0 By = 15 Vector C = Cx+Cy Cx = Ax+Bx = -6.36 + 0 = -6.36 Cy = Ay+By = 6.36 + 15 = 21.36 Vector C = (-6.36)² +...

Working on it now ...