An infinite solid cylindrical conductor of radius centered on the z-axis carries a current . The current is uniformly distributed over its cross section and is directed out of the page ( z direction). A coaxial infinite, thin cylindrical conducting shell of radius carries a current into the page (-z direction). 1. What is the magnitude of the B-field inside the inner cylinder at a radius of from the central axis

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat