Recent content by MrRandom66

No, that's all.

Homework Statement An empty, hollow, spherical conductor with radius R = 20 cm is supported in air. Electrical breakdown occurs when the electric field at the conducting surface exceeds 3.0 × 106 V m−1. What is the maximum charge that can be placed on the sphere? Homework Equations F = k...

Ah ok, I get it. Thanks very much

I thought g was the gravitational force, and we were looking for the acceleration from that?

By the way, did I have my units correct for w/m = g? = 12 N kg^-1

oh yes, of course, it's an acceleration! So, that's it then? I've been going over this for about two days now... it seems a little simple now! Many thanks.

Ah, so 2C = g = 12? So it would be 2/C = 2/12 = 6 m/s.

Also, forgot to say the equation for v v = u + at And although we don't yet know a, it's neglible since it's x 0, so makes it 0 anyway. hence v = 0 m/s

Homework Statement Determining the constants. After having trouble with differenciation, I think I finally got there. However now I have to determine some constants. I need to find numerical values for the constants B and C, which are velocity and acceleration. A ball is dropped down...

I think I've got the differenciation part susses. v(t) = dx/dt = B + 2ct a(t) = d2x/dt2 = 2c Now i', supposed to find numerical values for these, but not sure where to begin.

Ok thanks for your help. If someone else could help me I'd appreciate it.

Just realized the question does say "at small times the ball has the x-component of the ball has the following form", so shall I change t to perhaps 0.1s to discover position etc?

So, I presume A is Initial position, and not the amplitude? Anyway, second derivative. Velocity. R(t) = Bt + 2Ct^1 Which is 0 again isn't it? As time = 0s. Not sure I've done this correctly.

Homework Statement I'm total newbie when it comes to differenciatiation, and was wondering if I'm doing this correct. Basically, this is a physics problem, but thought I'd put this in the calculus section for specific help. It's about a ball undergoing SHM, after being dropped down a...

Completed it, thanks guys!