Recent content by Chrisas

"include whole class of 11 students." I think this is a key statement. I would spread the students out along the track with synchronized watches. Then each student would write down the time that the runner passed them. If you do that, can you describe how you would use the times to come up...

2.35 is given as the upward acceleration, it is not the initial velocity like you are trying to use it as. You are using gravity for acceleration which is not correct for the upward motion when the engines are firing. Added: The rocket is starting from rest on the launchpad.

You now need to find out how to use the givens in the problem statement. From this statement you can compute a number for I_1 and find the voltage across the internal impedance and the voltage across the left coils of the transformers. You need to consider what it means for the loads to be...

This: plot(x1,y1,x2,y2,x3,y3); or if all x and y's are same length: plot( [ x1 x2 x3 ], [ y1 y2 y3]); or as already mentioned: plot(x1, y1); hold on; plot(x2, y2); plot(x3, y3); hold off;

Welcome first time poster. Most of the answer has been given above in the discussion. To reiterate, when the switch is opened, no charge can flow in the left hand side of the circuit. There is not a complete path for them to follow. So I1 goes to zero. This means that resister R2 no longer...

Mean free path <http://en.wikipedia.org/wiki/Mean_free_path> In physics, the mean free path is the average distance covered by a moving particle (such as an atom, a molecule, a photon) between successive impacts (collisions) [1] which modify its direction or energy or other particle...

Sorry to resurrect an old post but I was considering this problem recently and came here to try and verify my answer. Answering this post seemed easier than typing it all over again. This problem comes from Barbara Ryden's Introduction to Cosmology. The text is an upper level undergraduate...

Do you think that taking any mixture of S1 (5.1 g/L) and S2 (39 g/L), both with lower than 45 g/L, will ever add up to 45 g/L without doing something like boiling off or removing some of the liquid? If not, then that means it must be some mixture of S1 and S3. How much S3? We don't know, so...

An additional explanation for you to ponder about why there exists a right hand rule. Imagine picking a point in space. Now draw a line out from that point in some direction. Let's decide to call this line the positive x-axis. Now let's decide to draw another line from this point such that...

I would say 8 is correct. No problem, hope it's right :)

If the weird symbols are supposed to represent the parameter, and you haven't covered methods that involve a parametric representation, then I would recommend trying some algebra/trig to eliminate the parameter from the two equations by combining them into one equation. It's hard to tell if...

Watch out for your typo...that should be 10^(-5)%. But other than that, I think that's right. See this for significant digits rules/examples http://www.batesville.k12.in.us/Physics/APPhyNet/Measurement/Significant_Digits.html#counting%20sig%20digits With an uncertainty of 2 meters, the range...

There is some interesting history behind this too. See http://en.wikipedia.org/wiki/War_of_Currents if interested.

See the section titles "Relative Uncertainty" at this link... http://www.batesville.k12.in.us/Physics/APPhyNet/Measurement/UncertaintyDictionary.html After looking at the link, post what you think the answer should be.

Oh..you mean the part on the second line all the way on the right side...yeah, looks like a typo on the first r' term in the denominator, should be -n+1. I was looking at the final line, which is correct.