1.) a steel rod is 3 cm in diameter at 25 C. a brass ring has an interior diameter of 2.992 cm at 25 C. at what common temperture will the ring just slide into the rod?
for this Q, i am not too sure which equation to use. i think it's the volume change one, which is delta V= beta(Vo)(delta T)...
question: a composite bar of length L=L1+L2 is made from a bar of material 1 and length L1 attached to a bar of material 2 and length L2.
show that the effective coefficient of linear thermal expansion is :
alpha= (a1L1+a2L2)/L
[- alpha/a=coefficient of linear thermal expansion]
i...
hold on...why the electron moves twice as fast, shouldn't it be squarroot(2) times as fast?
equation used: 1/2mv^2=Vq=KE
if V is doubled, and m and q is constant, then v should be squarroot(2) times as fast, isn't it?
mozart you are right, the ones which have the highest reduction potential will get reduced, and the one that have the highest oxidation potential (or lowest reduction potential) will get oxidized.
you should have a chart full of all the redox reactions to do this question. and i think your...
in a CRT, the deflection on the screen is 2.4 cm when the accelerating voltage is 480 V and the deflecting voltage is 36 V. what deflection on the screen will you see if the accelerating voltage is 960 V (doubled) and the deflecting voltage is 18 V (halfed)?
answer is 0.6 cm
can anyone...
oh...i think i got it...thanks for this "If a vertex only has one other vertex leading into it--say the other vertex has 7 ways to get to it--then how many ways can you get to that second vertex?"
again..thanks alot!
permutation question (math) [urgent]
image here
please solve this problem for me. the correct answer is c.
i put 10!/(4!6!), then i know i am suppose to divide/subtract something, but i don't know what. (i have never done this kind of problem before.)
acutally, i really think your radius is wrong, sqrt 68 then divide by 2 is 4.1231. i also think that the transformation part is right , but it turns out to be wrong in my calculator
if the equation is x^2+y^2=34 , then the centre is (0,0). but according to your diameter, the centre should not be (0,0). btw, the radius is 4.1231...
i think the equation is (x-2)^2+(y+2)^2=17
here's the problem
i want to find the net resistance. the only problem i think i have is that i don't know how to change the diagram so that the battery isn't in the middle of the circuit (i only know how to do questions where the battery is connected like a single complete path, which this...
whew, holycow, THANKS A LOT MAN. i finally get it, turns out i am missing some thing i "think" i would of thought about...
again, thanks very much for your time and your elaborate drawings.
i want to transform the black diagram into a series and parellel circuit (as u a see that the black diagram isn't exactly series or parellel). i made the two top left resistors into one (blue circle), and i want to do the same thing for the other two in green circle. however, if i make the top...