Recent content by mtig

Ok thank you.

Hello, When we talk about the luminosity, apparent magnitude or absolute magnitude of a star, are we talking about all wavelengths of EM radiation or just a certain range? I've read that luminosity is basically the power output of all types of radiation, but the apparent magnitude scale is...

Yes I've done one now and I understand it now, thank you for the help. What got me I think was that on moment questions I am used to a straight bar as oppose to something round. Thanks.

So I set up the moment balance where the edge of the roller is in contact with the step. The force from the centre of the roller applied by the person would be my anticlockwise moment. I am unsure where or how a component of the weight of the roller provides the opposite moment of force.

Thank you for the replies. I understand what the question is asking now I think. anticlockwise moment = F x 0.25 clockwise moment = 0.25 x 85 x 9.81 x cos 45 F = 85 x 9.81 x cos 45 So F = 590N I am still trying to understand where the moment of the forces are coming from. It seems like...

Homework Statement A gardener pulls a roller of mass 85 kg over a step. The roller has a radius of 0.25 m. The handle is attached to an axle through the centre of the roller at an angle of 45 degrees to the horizontal. Here's a link to the diagram below, it's figure 1 and 2 on question 18...

Thank you very much I've got the right answer now. I did 1/(3.33 + 6) + 1/7 = 0.25 Therefore resistance = 4 Ohms I sort of get where I went wrong but I'm still getting my head round it.

I added up the resistors in series (6 + 7) = 13 Then the two in parallel (1/10 + 1/5) = 3/10 Therefore resistance in parallel = 10/3 = 3.33 = 16 ohms

Homework Statement Assuming the wires have negligible resistance, find the equivalent resistance between the terminals A and B. Answer to 2 significant figures. Homework Equations [/B] 1/R = 1/R1 + 1/R2 ... + 1/Rn R = R1 + R2 + RnThe Attempt at a Solution [/B] I have drawn a more...

Hello, I'm from England currently doing a Physics A level, would appreciate some help and also will try to contribute myself if I can.