A particle is attached to an inextensible string. The other end of the string is attached to the centre of a rotating rough disc. The string is shorter than the radius of the disc so the particle remains on the disc and moves in uniform circular motion.
I don't remember the quantities but the...
At this stage of my education there's a lot of things that we're just supposed to accept and roll with it. Last year electricity was pretty much Ohm's law and Kirchoff's rules, now I've done electric fields so I'd like to understand it in more detail. Let's consider a simple circuit with a...
I've been studying em induction and in my book it was explained by considering a metal rod of length l moving through a magnetic field and cutting through the field lines at a constant speed. So in time dt it moves through ds and they showed e=BA/dt, where A = l x ds(the area that the rod...
I attached a picture of two pages in the book:
The left pic is explaining the theory generally and the right is an example of proving SHM with a spring on a smooth horizontal table. They both have notes in yellow boxes saying x'' is in the direction of increasing x. Do you have an idea of what...
It was brought to my attention that physical acc might not be the same as mathematical acc and mathematical acc is really the second derivative of x with respect to time, and the book is saying x˝ (not acc) is in direction x increasing, so I don't know if that makes a difference. And as far as...
Mathematically, in SHM,why is x'' (acceleration) always in the direction if x increasing? So if he have a simple setup, an elastic spring on a smooth horizontal table, one end attached to a fixed point, the other to a particle. Let's say the fixed point is at the left end of the spring. If we...