Search results

  1. S

    Inductor in simple circuit w/ graph Problem Help

    Homework Statement In Figure 30-63, the inductor has 26 turns and the ideal battery has an emf of 16 V. Figure 30-64 gives the magnetic flux through each turn versus the current i through the inductor. If switch S is closed at time t = 0, at what rate di/dt will the current be changing at t =...
  2. S

    Magnetic Fields Shrinking Radius Help Please

    Homework Statement An elastic conducting material is stretched into a circular loop of 20.0 cm radius. It is placed with its plane perpendicular to a uniform 0.900 T magnetic field. When released, the radius of the loop starts to shrink at an instantaneous rate of 78.0 cm/s. What emf is...
  3. S

    Two small insulating spheres with radius

    E(sphere) = Q/ 4pi(distance)^2 Notice that this the same as a point charge. You do not need to worry about the radius of the sphere for this part of the question.
  4. S

    Converging / Diverging - What is it?

    Convergence and divergance basically revolve around limits. Are you studying integrals, or series and sequences? With improper integrals(which I think you are studying), all you need to to is find the limit of the eqaution; if it does dot approach a specific number as n approaches infinity it...
  5. S

    Object on whirling string

    Force centripetal acceleration = (mv^2)/r (x-axis) Force gravity = ma (-y-axis) Draw a vector diagram T = "hypotenuse"
  6. S

    Electric force and charge

    F=Eq, use sin and cosine to find the components.
  7. S

    Wave Interference QUICK PROBLEM

    Sounds like it. Just graph the points, connect them with a common curve (prob something like a sin or cosine graph) and point out where the curve reaches its maximum and/ or minimum (concave up or down).
  8. S

    General physics question (position,velocity and acceleration)

    Using a diagram for this one is incredibly helpful (as you did). Using your trigonmic triangle to find the initial velocities of each plane(horizontal and vertical). The 60km/h should be the "hypotenuse of the vector diagram (triangle). Use the sin and cosine of 5 degrees to discover both...
  9. S

    Calculus Free Response Question help please

    yes, i did forget to use n! in the denominator. New Equation(for part a): f(x) = 1 + (2(x-2))/3*1!) + (6(x-2)^2)/(9*2!) + (24(x-2)^3)/(27*3!)+...+ ((x-2)^n)/((3^n)*(n!)) I got this by using the given nth derivative formula f^n(2)= (n+1)!/3^n for the f1 f2 f3 derivitive parts of the formula...
  10. S

    Calculus Free Response Question help please

    Homework Statement The function f has a Taylor series about x=2 that converges tp f(x) for all x in the interval of convergence. The nth derivative of f at x=2 is given by f^(n)(2)=((n+1)!)/3^n for n>=1, and f(2) =1. (a). write the first four terms and the general term of the Taylor series...