Recent content by jontyjashan

OK. Can I get a link or the actual calculations themselves?

He also said that if we take into account black body radiations , then we can make calculations very close to the actual efficiency(around 16-32 percent).

I have undertaken a course on Semiconductors. My professor told us that a sun-solar cell system can be taken as a Carnot Engine. He assumed that the surface temperature of sun is 6000k and that of solar cell is 300k.And then he found out the efficiency by (1-T1/T2), which came out close to be...

Still my query is not solved

Let f be friction. Then mgsinx-f=ma(linear) Also equating torque we get fR=I@(angular acceleration) and a=R@ for pure rolling Solving this v get f=Ia/R^2 And a = gsinx/1 + I/MR^2 So finally we have minimum friction coefficient for pure rolling is tanx/1 + MR^2/I

Just try it once yourself and btw you can find it in any good standard physics book.

I don't think this. Physics says this and it can be proved easily using concept of pure rolling and solving some eqns

But if we look at the friction required on inclined plane for rolling it is some function of tan x . So if we look at the rightmost point of the loop at the height of radius the coeff would be some function of tan90 which is infinite

If we set a ball rolling on a loop-the-loop track,why do we say that we need infinite friction coefficient for the ball to complete the loop. This seems illogical because f=kN. Since f and N are finite how can k be infinite ?

Thanks. Explanation was really good. Can you make a graph of this using calculators. I was not able to do so. Take any arbitrary values of theta, mass and friction coefficient . It would really help.

Our teacher had asked us to plot graph of frictional force acting on a given mass kept on an incline vs its angle of inclination .i made a graph where the max frictional force was at angle arctan u(coefficient of friction ) . The graph of friction at angle less than arctan u was proportional to...

thnak you guys. But can u please specify how to find out whether I am good enough for MIT? and if not MIT what shold i pursue?

THANK you guys. IT helped a lot. Actually I am a student from India studying in grade 10.I am an NTSE(National talent search examination) scholar.It is the most prestiged scholarhip among students. After schooling almost all students here who want to take up engineering five the IIT-JEE(Indian...

Hello Guys, I want to know what is the criteria to enter MIT(Massachusetts Institute of Technology) What are the courses offered here?

thanks good reply but where can i get my doubts clarified?