Recent content by Dazed

That does help a lot, thanks. But it raises one question for me, you say the current is the same through all resistors, but as I understand, the resistance causes the current to drop. Hence the I = V / R formula The previous question I did was "What is the current through each resistor?" in...

Homework Statement 2. For the following circuit, find RT, IT, I3, V1, V3, V5. http://img520.imageshack.us/my.php?image=m17aje5.gif Homework Equations V = IR, ohms law, Kirchoff's laws The Attempt at a Solution RT = R1 + R2 + R3 + R4 + R5 + R5 RT = 20 + 22 + 30 + 27 + 40 +...

This is the formula we were given: Q = Ne Where Q is the charge in coulombs, N is the number of electrons, and e is the elementary charge (1.6 x 10^-19 C). So the elementary charge is actually -1.6 x 10^-19 C whenever you're dealing with electrons?

3. In a lightning bolt, it is estimated that a charge of -20 C is transferred from a cloud to the Earth. How many electrons make up such a lightning bolt? N = Q/e N = -20c / 1.6 x 10^-19 N = -1.25x10^20 I'm pretty sure this is the right answer. What I'm wondering is... how can I have...

Thank you for your reply. :) I think I've correctly fixed this as per your suggestions, I used the units c/kg instead of c-kg, I assumed that was a typo. If c-kg is correct please tell me and I'll change it. Also please tell me if the new answer is correct or of I messed up somewhere again. :)...

Just looking for someone to check my work on this question before I submit it to the teacher. Any help is appreciated. :) 3. A 0.500 kg pot of hot water for tea has cooled to 40.0 OC. How much freshly boiled water must be added (at 100 OC) to raise the temperature of the tea water to a...

Thanks buddy. From the phrasing of the question I was given the impression that the initial velocity could not be zero. (the cart is at rest before 0 and released at 0, so there must be some instantaneous acceleration) Much thanks for all the help, I'll be glad to put this behind me now...

Homework Statement distance (cm) 0.0 5.0 15.0 30.0 50.0 75.0 105.0 140.0 time (s) 0.0 0.1 0.2 0.3 0.4 0.50 0.6 0.7 a. calculating the displacement during each time interval. Add to the above table of data. b. calculating the velocity of the cart during each...

Sweet. I owe you one, thanks. That was a pretty tricky question, considering the only formula we've been given so far is v = d/t in this unit. :\

Ohhh, that would make sense Cristo. Unfortunately I don't know how to use that equation. I know what "a" and "t" are, but what are "s" and "u"? Also, did I calculate the correct acceleration? 2 m/s^2? Thanks a lot man Edited to add: If the initial velocity is 10m/s then the rest of the pieces...

Just to recap, this should yield 1050, not 900. http://img242.imageshack.us/my.php?image=graph3qs5.jpg And I'm not sure why I'm not getting it. The only logical answer is I have the wrong velocity at 30 s. And I don't know how to get the right one.

Here's the Velocity-Time graph with the area under the curve measured. http://img242.imageshack.us/my.php?image=graph3qs5.jpg And here's the Distance-Time graph from Question 1

Can you tell me what I did wrong? I thought I also made a velocity time graph.. :\ See the link:http://www.freewebs.com/dazed42/physics.htm

I think I may have found the problem. The /average/ velocity for seconds 25-30 is 60 m/s. The problem makes sense if the final velocity is 70 m/s (at 30s). This makes a triangle with base 30 and height 70. The area of which is .5 x 30 x 70 = 1050m. But I don't know how to arrive at that final...

"The displacement of the object can also be determined using the velocity-time graph. The area between the line on the graph and the time-axis is representative of the displacement" http://www.glenbrook.k12.il.us/gbssci/phys/CLass/1DKin/U1L6e.html