Using Ampère's law (Bodl HoI enc ) to show that the magnetic field a distance r dt %3D away from the axis of an infinitely long straight wire carrying a uniform constant current I (shown below) is given by B = 2o ô. For full credit, show your steps and include a clear 2ar diagram showing the vectors B and di.

A child does 466 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is 4.8 m above the ground. What is the mass of the box? Use g = 9.8 m/s2   Calculate to one decimal

A lego robot is tied to a string and swung around in a circle. What is the work done by the string while the robot travels from point A to B? I Backup link to image (opens in new tab). Positive Negative Not enough information given g

The diagram above is the potential-energy diagram for a 520 g particle that is released from rest at point A. What is the particle's speed (in m/s) at B, C, and D?