How does electromagnetic induction in a moving loop of wire cause an electric generator to produce an electric current?
A. Mechanical energy flows out of the magnets and into the electric
charges in the loop of wire.
B. Charged particles flow within the wire because they are pushed by
the magnetic field of the magnets.
C. Charged particles flow when the loop of wire is attracted by the
magnetic field of the magnets.
O D. Electrons flow from the magnets into the loop of wire and
continue to flow within the wire.

We found the centripetal acceleration of the earth as it revolves around the sun. compute the centripetal acceleration of a point on the surface of the earth at the equator caused by the rotation of the earth about its axis. (enter the magnitude. the radius of the earth is 6,371 km.)

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.