Is your friend's diagram correct? Support your answer using your knowledge of how a lens transmits light rays.

Why do different substances have diffrent properties

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?