Recent content by frostking

Thanks for your input. I hope the test tomorrow night has more concrete questions! Frostking

There is no diagram and no explanation of this magical B' that he comes up with. The only thing I can figure is that the wire goes from negative infinity to positive infinity and therefore we are only considering 1/2 of the total. What do you think of that? Thanks for your time! Frostking

Homework Statement A current I flows to the right on the x-axis from the origin to x = infinity. What's the magnitude of the magnetic field at (x,y) = (0,L)? Homework Equations B = u sub 0 time I/(2 pi R) The Attempt at a Solution We use above equation since we have an extremely...

Homework Statement We have a thin rod of length 10 cm uniformly charged with a total charge of + 40 nC . A small glass bead charged to + 6 nC is located 4 cm from the center of the rod. What is the force on the bead? Homework Equations E = integral of K dq /r^2 and Q = lambda L and...

Thanks so much. I will remember this and use it! Frostking

Yes, silly me it is M = 25/F On exams we are only allowed to use formulas on our formula sheet or that can be derived from the formula sheet. This formula is NOT provided. I guess I will just have to memorize this and hope that it is allowed to be used on the final. Thanks and sorry for...

Homework Statement I need to build a telescope from two magnifying lens, one is 2x the other is 5x. First I need to give the total magnification possible, state which lens to use as the objective and finally to state the length of the telescope. Homework Equations l Ml = Fo/Fe total...

Homework Statement What is the magnitude of the torque caused by the force of gravity on the moon by the earth? Assume both are spheres of uniform density, the axis of rotation passes through the center of the Earth perpendicular to the plane of the moon's orbit. Earth's mass 5.98 x 10^24 kg...

Homework Statement A mass spring system has the following parameters: damping constant is 1.00 Ns/m spring constant is 1.00N/m and mass is 1.00 kg The mass is displaced from equilibrium and released. Through what minimum number of oscillations must the mass move in order to reduce the...

Homework Statement A binary star system has a period of 90 days. It consists of two equally massed stars each with a mass of twice that of the sun, that rotate like a dumbbell about the center of mass at the midpoint between them. How far apart are these stars? Homework Equations F =...

Thanks very much! It is a bit abstract but I can see the logic of assuming all of the kinetic energy is used up to escape. I will remember that potential energy due to gravity is negative. Thanks again for the assist. Frostking

Homework Statement A space station orbits the sun at the same distance as the Earth but on the opposite side of the sun. A small probe is fired away from the station. What minimum speed does the probe need to escape the solar system? Homework Equations Usubg(initial) + Kinitial =...

Thanks, yes I should have realized I needed to check for other values less than or equal to pi!

Homework Statement A particle has potential energy U(x) = x + sin ((2 rad/m) x) over the range of x greater or equal to 0 meters and less than or equal to pi meters Where are the equilibrium positions in this range and for each is it a point of stable or unstable equilibrium...

Thanks so much for your help! I know I am being dense but this one just confused me. So, we have: 3g - T = 3a and T = 9a THerefore, 3g - 9a = 3a 12 a = 3 g a = 2.45 m/s^2 Now we use the weight of block on table 9 times 2.45 = 22.05 N We could not use the weight of...