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1. ### Power in an RL Circuit

An RL circuit in which L = 9.00 H and R = 5.00 is connected to a 24.0 V battery at t = 0. (a) What energy is stored in the inductor when the current is 0.500 A? (b) At what rate is energy being stored in the inductor when I = 1.00 A? (c) What power is being delivered to the circuit by the...
2. ### Inductance RL Circuit

[SOLVED] Inductance RL Circuit Calculate the inductance in an RL circuit in which R = 0.300 and the current increases to one fourth its final value in 1.40 s. I tried doing this with V=IR, (I know, the easy way didn't work). I also tried I= V/R(1-e^(Rt/L)) but I don't know what V would...
3. ### Square Wire Magnetic field

Can anyone help me with this problem? In Figure P22.31, the current in the long, straight wire is I1 = 8.00 A and the wire lies in the plane of the rectangular loop, which carries 10.0 A. The dimensions are c = 0.100 m, a = 0.150 m, and = 0.350 m. Find the magnitude and direction of the net...
4. ### Gauss's Law Sphere Problem

A sphere of radius 2a is made of nonconducting material that has a uniform volume charge density . (Assume that the material does not affect the electric field.) A spherical cavity of radius a is now removed from the sphere, as shown in Figure P19.62. Show that the electric field within the...
5. ### Oscillating Slingshot

A ball of mass m is connected to two rubber bands of length, L, each under tension T, as in Figure P12.49. The ball is displaced by a small distance y perpendicular to the length of the rubber bands. (a) Assuming that the tension does not change, show that the restoring force is -2yT/L ...
6. ### Dampened Oscillations Problem

[SOLVED] Dampened Oscillations Problem A pendulum of length 1.00 m is released from an initial angle of 15.0°. After 1200 s, its amplitude is reduced by friction to 5.5°. What is the value of b/2m? How do you do this one? I know it has something to do with the formula w= sqrt(W0^2 -...
7. ### Pendulum Oscillations Problem

[SOLVED] Pendulum Oscillations Problem A very light rigid rod with a length of 0.500 m extends straight out from one end of a meter stick. The stick is suspended from a pivot at the far end of the rod and is set into oscillation. (a) Determine the period of oscillation. (Hint: Use the...
8. ### Potential energy of an Atom

How do you find the electric potential energy of a hydrogen atom using the Bohr model? I tried doing U<sub>E</sub> = K(q1)(q2)/r, using the charge of an electron and the charge of a proton for q1 and q2 and using the Bohr radius for r, but that didn't work. How do you do this? (P.S. the answer...
9. ### Net Gravitational Force Problem

I have two problems: can anyone help? First Problem: A 200 kg object and a 700 kg object are separated by 0.700 m. (a) Find the net gravitational force exerted by these objects on a 60.00 kg object placed midway between them. (b) At what position (other than an infinitely remote one) can...
10. ### Physics help: rotational mechanics satellite

Homework Statement A space station shaped like a giant wheel has a radius of 90 m and a moment of inertia of 4.50 108 kg·m2. A crew of 150 are living on the rim, and the station's rotation causes the crew to experience an acceleration of 1g (Fig. P10.47). When 100 people move to the center of...