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    Conservation of Energy

    Kinetic and Potential energy. Looks like an application of work energy/
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    Static Forces

    So what's your plan of attack? Doing a simple sample problem in your text will point you in the right direction
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    Finding resistance using a series and parallel circuit?

    :bugeye: :mad: What are you doing??? You just gave him pretty much the entire solution to problem.
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    Finding resistance using a series and parallel circuit?

    Well I would be careful of the way you're labeling V and i. Like label it i1 and i2, for the currents going through R1 and R2 in the parallel circuit. Same thing for the voltages in the series circuit. Also post up what you have so far, so maybe someone else can help you out. :smile:
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    Finding resistance using a series and parallel circuit?

    Yea that works, and I see what you're trying to do. The method I posted in my first post would not need to find V and I.
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    Finding resistance using a series and parallel circuit?

    You're given V and i in this problem. Draw circuits for both cases of series and parrallel circuit. From there you can see how to solve it, then wite out the equations. Hint: Reduce the resistances to one equivalent circuit for both cases. Also why do you think R1 = R2?
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    Cylinders on inclines

    Edit:read your work wrong. Look at both FBD of A and B seperately
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    How do I show the 100N force is cartesian form?

    Well there's a few ways you can do this. The easiest is to take a moment about the y-axis. You have the force in vector form now, so in your diagram you can redraw that force in the x,y,z direction. Then use the right-hand rule to decide which forces produce moments about the y-axis.
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    Particle Dynamics Problem

    Cristo gave you the equation, so solve the diff eq. Also the answer to the problem that you posted 16.89 ft, is not right. The question isn't asking for a numerical answer. Another way is take the equations you have V=ds/dt a=dv/dt and eliminate dt and just integrate and do the algebra.
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    Kinematics of Particles

    Thanks for showing the alternate method. Funny that rotating the axis was my first very first atempt before I stopped and went with a regular x-y coordinate system. When i changed my reference frame I had left R = x, when it was suppose to be X = R cos (B) in the other. I should have stayed with...
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    Kinematics of Particles

    :surprised DIdn;t think my question would lead to a trig review. I was getting tired and was starting to think my source of error was the trig, which it wasn't.:frown: After a little rest and some food, the problem is solved. Turns out I can't use the equation in the 2nd image. The work...
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    Kinematics of Particles

    thanks for the response All my known data is written down somewhere on another paper. What i posted was me scrippling all over the place. Can someone confirm that my velocities are correct and that my relationship for y is correct. B = theta Vx = u sin B Vy = u cos B I put my origin at the...
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    Kinematics of Particles

    Homework Statement http://img402.imageshack.us/img402/5733/problemvm7.th.jpg [Broken] I had to draw in that line. It was suppose to show a dotted line of the projectile, but the page did not scan well. Homework Equations The Attempt at a Solution First atempt...
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    Static equilibrium calculation

    Start out with a free body diagram of just the leg + sling. You will have forces from the weight of the leg(acting at CG), the hipjoint and the tension from the sling. Note that you have a pulley and probably assuming it is frictionless. Once you have the diagram set up, you should see how to...
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    Static equilibrium calculation

    Any chance you can post a diagram of the figure? The only equations you need are the ones for static equilibrium.
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    Newtons 2nd Law Problems

    That's your initial velocity and you have to do something with the units. Refer to the link Astronuc put up for the constant acceleration equations.
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    Connection of circuits

    Too bad i can't physically show you, it would be alot easier. t Parallel is when they share the same two nodes and series is when they share a single node. If you want to connect an element in parallel, just put the same element above or below the first on the same columns. What you wanna do...
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    Torque and the Two Conditions for Equilibrium

    I don't really understand your work. You are solving for some variable F, which i don't know where it came from. Draw a FBD if you haven't already. Your diagram should have the two forces that are given in the given diagram (Fb, Fm), and a force at the elbow. Treat the elbow as a pin joint...
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    Multi Loop Circuit

    next time try uploading it to one of those free hosting sites like imageshack.
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    Error calculation

    personaly i think error analysis is a real pain to calculate sometimes, cause you have to carry over all the +- uncertainties. try this link http://www.smccd.net/accounts/goodman/physics/p270/p270_labhandouts/unknown_mass.pdf read pages 2-4. Once you do the practice problem on page 4...
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    Tensions in the ropes

    Start of with a free body diagram. Always draw a free body diagram with these types of problems. Then identify all the forcecs. Then sum up the forces in the x and y directions.
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    Material science-Specification of composition

    Is this problem from Materials Science and Engineering Intro by William D CallisteR? If it is then it's question # 4.22. Anyway try doing #4.20 first, or just simply use the equation thats given in # 4.20.
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    Projection of vectors

    I was copying my friends notes and had a hard time understanding one of the examples he had written down from lecture. See the attachment for a the picture of the example. This example looks like a projection of two vectors to me, but i'm not sure. u'=\frac{4i+2j}{\sqrt{20}} u' = unit...
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    Srping Problem

    Yea, i can solve it now. Just solve the system. I think what was throwing me off was tension and compressive force. I was thinking the spring was being compressed every time, but in fact it is being pulled for for 0.18m and then compressed to 0.16m. Thanks man
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    Srping Problem

    Spring Problem I need some help or hints on this exercise When a certain linear spring has a lenth of 180mm, the tension in it is 170N. FOr a length of 160mm, the compressive force in the spring is 130N. a. What is the stiffness of the spring in SI units? In U.S. Customary units? b. What...
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    Help me ace my physics test tomorrow!

    Hard to tell if its right without seeing the work, but these don't take alot of calculations, so.... The answer is right. Also I would't say the formula is always going to be that. correct At a glance your answer is the acceleration, but the question is asking for the speed.
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    Anyone know of good sites that teach you tricks to solving physics problems?

    my physics professor has this link on his site. Maybe it might help http://www.oberlin.edu/physics/dstyer/StudyTips.html
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    Finding Resistance and Inductance of solenoid

    Thank you olderdan Also for calculating the inductance, I am using this equation L=\mu_0n^2V n is the number of turns per unit length. Do i just divide the number of turns that i got from the first part by the length of the wire to get n?
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    Finding Resistance and Inductance of solenoid

    The inductance of the solenoid determines the time it takes to establish this current. Find the inductance,the resistance, and the time constant of a solenoid that is constructed by wrapping five “tightly wound” (i.e., wire-against-wire like this ) layers of 0.30 mm diameter copper wire on a...
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    Physics problem, why is my answer wrong? HELPPP

    Part A: Your equation is set up right, however you need to multiply the final kinetic energy by 2 since you have 2 neutron stars. final distance = 1/2 initial distance, subsitute that into the equation. Also you shouldn't really label r as the initial radius, because this part of the problem...
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