Recent content by physicsfun_12

Homework Statement I linear spring has one end attached to a ceiling, the other end hanging freely. It was noted that the spring was extended by 120mm when a mass of 2.5kg was attached at the bottom. If the moment of inertia of the mass is 10kg.m2 about its vertical axis, calculate the...

Clever! Thanks a lot! Mike

Homework Statement An electric motor starts from rest at time t=0. Its angular velocity is: w=100t-4t3 A) If the angle of rotation, x, of the motor is also zero when t=o, determine an expression for this angle in terms of t. B) Determine the angular velocity when x=2pi radians. Give your...

Hi there, Thanks very much for your useful post. I think I've got it, but not too sure about the last question. I said that the clockwise moments = [40000 x (a+c+d)] + [27050 x d] + [18000 x h] Is that ok? Oh and for the other questions, should the answers be a) 18000=Tcos45 T=25455.8N b)...

Homework Statement Hi there I have attached a copy of the question to this post. I have never come across this, and don't really know where to start. Any pointers much appriciated. Thanks in advance, Mike Homework Equations The Attempt at a Solution

Sorry about that, you are absolutely right... that's most probably why I was getting it wrong in the first place! Thanks for your help and take care, Mike

I think I've got it now. I was using loop analysis so that's why there is only two currents. The 20s came from 60=10Ia + 10(Ia+Ib) which expands to give 20Ia + 10Ib You can work out the currents using simultaneous equations, giving a Ia=3.333A and Ib=-0.6666A I of the load resistor, Il=Ia+Ib...

You are quite right! I got 6.2284x104 this time!

Hello, I used 8.99x109 for k. Thanks again! Mike

Homework Statement Hello there, hope you are well. I am having trouble solving this problem involving Kirchoff's laws. I have attached a copy of the circuit and problem to this post in jpeg format. Thanks again in advance for any help. Mike Homework Equations The...

Oh I see, so since the x components would cancel, you would just double the y component which is cos30*the elctric field strength calculated i.e. 6.28104NC-1 Thanks a lot, do you know if the answer I have calculated is correct?

Homework Statement Hi there, I am having a lot of trouble with this problem. Any help much appriciated. Thanks inadvance. Two point charges, each of 4x10-6C are placed 1m away at points A and B respectively. Calculate the electric field strength at a point P, which is a distance of 1m...

Hello, thanks for your response. Is that differentiation? Not too sure about how to do that. Any chance you could get an answer from your method and compare it to mine. Thanks again, Mike

Homework Statement Hello, I wonder if anyone could check my answer to this problem. Thanks in advance An electron is liberated from the lower of two parallel plates separated by a distance of 5mm. The upper plate has a p.d. of 1000v relative to the lower plate. How long does it it take for...

Homework Statement Hello there, hope you'r well. I am having trouble factorising this cubic. I am comfortable with quadratics however I have never had to factorise anything to the power 3 before. x^3+3x^2y+2xy^2+6y^3 Thanks in advance for any input. Mike Homework Equations...