Recent content by Andy111

Thanks, I see where my mistake was now, I didn't draw the vectors "tip-to-tail".

Well yes, and I put the angle 130 between A and B, and if that's correct then I don't know how I got this wrong.

I'm a bit lost, why isn't 130 the correct angle to use?

I did (A+B)^{2}=A^{2}+B^{2}-2ABcos(130) and solved for (A+B). I got an answer of 17.444148, but that was wrong.

Homework Statement Consider two vectors ~A and ~B and their resul- tant ~A + ~B . The magnitudes of the vectors ~A and ~B are, respectively, 12.1 and 7 and they act at 130◦ to each other. Use the law of cosines to calculate the mag- nitude of the resultant...

Homework Statement Find an explicit formula for the sum of the series, given that the formula for any term in the series is \frac{1}{2n(n+3)} Homework Equations The Attempt at a Solution

Thankyou so much. I got 18.6 substituting with -4 instead of 4, which was correct. I also got the 3rd question right. So I don't need any more help now.

I found the equations for 1&2, so I don't need help with those anymore.

Homework Statement 1) A 24 cd point source lamp and a 73 cd point source lamp cast equal illuminances on a wall. If the 24 cd lamp is 6.3m from the wall, how far from the wall is the 73 cd lamp? Answer in units of m. 2) Two lamps illuminate a screen equally. The first lamp has an intensity...

Homework Statement Determine an explicit formula for the sum of n terms for the given series: 1, \frac{1}{2}, \frac{1}{3}, \frac{1}{4}, \frac{1}{5} Homework Equations The Attempt at a Solution I calculated the first 5 terms for the sum sequence and got: 1, \frac{3}{2}...

Yes, it is the z-axis, not the y. So is the equation just going to be F=6x62x0.11?

Homework Statement A segment of wire carries a current of 62 A along the x-axis from x=-6m to x=0 and then along the z-axis from z=0 to z=2.9m. The magnetic field is equal to 110 mT in the positive z direction. What is the magnitude of the force on this segment of wire? Answer in units of...

Nevermind, I see where the mistake was. I used 2.7, it's supposed to be 4.7

Okay. I got an answer of 7.02 using those equations, but it was incorrect.

Homework Statement A loop circuit has a resistance of R and a current of 1.8A. The current is reduced to 1.3A when an additional 2.7 ohm resistor is added in series with R. What is the value of R? Homework Equations I is constant throughout a series circuit V is shared in a series...