What is neccessary for a magnetic field to create electric current in a copper coil?
a. the magnetic field must be moving or changing
b. the magnetic field must not be moving
c. the north pole of the magnetic field must center the coil before the south pole
d. the magnetic field must be in the center of the copper coil

Describe the path of the electric current through a circuit?

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.

What object a collides with object b and bounces back its final momentum is?