# Search results

1. ### Central limit theorem and estimates of probability

It's not 1/2. Check your calculation.
2. ### Central limit theorem and estimates of probability

As Simon said you are using p for two different things. You can use the fact that p(1-p) (where 0<p<1) has a maximum value(find it). You can use it to get a bound for your answer.
3. ### Friction and Pulleys

Write the newton's laws in the frame of the ground. It is an inertial frame. Write down all the forces(along both axes). Also observe that for every meter the car moves, block A moves by 2 meter.
4. ### Finding maximum value

yes,x=y is only possible. By graphing all lines and checking possible values for x, i get x between -20 and 20. And maximum is indeed for x=-20.

(10,10)
6. ### Finding maximum value

That is not going to work.What you say is maximum is true only for a=b,if you apply AM GM inequality on a,b.Doing so for 1st 2 expressions give x=140,y=260. *I don't know the answer*
7. ### So You Want To Be A Physicist Discussion

Nice essay.Really an eyeopener. Thanks ZapperZ.
8. ### Chemistry Equilibria Help

no you dont have to include no.of moles of solid. no, it would go backwards,as Qp>Kp. for (iii) and (iv) read le chatelier's principle. http://www.chemguide.co.uk/physical/equilibria/lechatelier.html#top
9. ### Proof square root bijective;

to prove square root function to be bijective you need to specify the domain and codomain of the function. if codomain is set of real numbers, then its not bijective.
10. ### Chemical Kinetics - Activation Energy and gr

the integrated rate law for 0th,1st,2nd order might help for problem 13. for q.14 use first two data to find the rate law and rate constant. then using arrhenious equation and the third data find rate constant at 650K. use the integrated form of rate law to find the required time.
11. ### A question on impulsive tensions

i get 0.782 if i take g=9.8 m/s^2.
12. ### Multiloop circuit Diagram

if you need equivalent resistance, then it can be reduced to series/parallel combination by first using delta star transformation.

cartesian

batesian

x ray

17. ### Electric field problem

yes,|E| is also zero.
18. ### Electric field problem

there will also be the contribution of induced charges on the conductor surface (the net induced charge being zero) on the potential and field inside it. the field inside a conductor is independent of the charges outside it.if you bring another charge outside ,although the distribution of...
19. ### Tan and ArcTan calculation

what i meant was phi cant be greater than 1.5pi and cant be less than -1.5pi.see there are 3 arctan terms.
20. ### Tan and ArcTan calculation

range of phi is -1.5pi to 1.5 pi.so obviously 180 is degree
21. ### Rearrange this equation to make x the subject

not necessarily, see for example, f(x)=1/x ;x>0 f-1(x)=1/x and they are coincident.
22. ### Induced charge distribution

Bump.........
23. ### Charge transfer Problem

have you checked the direction of electric field between plates? going against the field ,potential increases.
24. ### Year 12: Cambridge Physics Problem (Rate of increase of ice thickness)

http://en.wikipedia.org/wiki/Thermal_conductionFor the formation of layer of thickness dh calculate how much heat will be transferred from pond to surounding .then use 1D heat conduction formula to relate it to the given parameters.
25. ### Possible pendulum questions

what is the dependence of period on amplitude? can you detect the deviation from small angle time period at larger amplitudes(angle) using the instruments you have? suppose bob is filled with water and there is a hole at bottom how does period change as time progresses?
26. ### Implicit Differentiation

that is equal to 2y because you differentiate wrt y.
27. ### Induced charge distribution

if the charge q is imagined to be uniformly spread over the plane passing through that charge and parallel to the plates , the charges induced on plates remains unchanged, only their distribution changes. can anyone explain that.......
28. ### Charge transfer Problem

for this problem use the fact that two facing surfaces have equal and opposite charges(a consequence of gauss's theorem).when the switch is closed first assume certain charge distribution on each face and use the above fact.you also have net charge on plate2=2Q, and the sum of charges on plate1...
29. ### Calculate spring constant for cart attached to a spring

how do you relate k , period and mass?
30. ### Conservation of angular momentum

thanks tiny-tim for your replies.