We learn from school that when we shine white light through a prism, dispersion occurs. This is because the light of varying wavelengths are refracted to a different extent due to how refractive index varies with the wavelength of light. So why does refractive index vary...
You know, the simplest way to do this question is to make use of the young's double slit experiment equations? This is effectively the same thing, only the waves are sound waves and the screen is the person.
Frankly, I have no idea which r to use. But What I would do is I would try and derive it.
F = ma
Torque = Moment of inertia x Angular Acceleration
Now moment of inertia can be calculated using parallel axis theorem. After which you can find Torque. Angular acceleration can be calculated...
Work done by a force must be moved through a distance. Yes this is true. However, you must keep in mind the fact that we are not considering work done ON the wall. We are considering work done ON the egg. The egg does moves, by a very minimal amount where the deceleration occurs.
Your method, including the kN portion, looks correct (Assuming you didn't make any computation errors). However, you may want to use another formula (also derived from these two) which would allow you to skip a step.
(Vf)^2 = (Vi)^2 + 2aX
This would save you having to compute time.
I'm not sure if i'm right.
I think the easiest way is to use your gut feel. That is it must be nearer to -2q than 3q since further away from 3q, the effect of the 3q charge would be less.
Your approach looks right to me. But you must keep in mind that when you sub V = 0 in, you...
Why is it a trick question?
I would have thought what would happen is the tangential velocity would be maintained while radius would vary such that centripetal acceleration would equal to the gravitational force acting on the 100g weight left?