If the index of refraction of glass is 1.8 and the speed of light in air is 3.00 · 108 m/s, what is the speed of light in that glass? (round answer to nearest hundredth.)

1.67 * 10^8
6.00 * 10^-9
5.40 * 10^8

What are the north and south poles of a solenoid change with?

The solid that is formed and usually sinks to the bottom of a solution is the

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.