The Keck Telescope has a diameter of 10.0 m. When it is looking at Mars, 7.38.1010 m from us, how far apart are the closest objects it could possibly resolve? Assume the light has wavelength 633 nm.

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?

How do you know how many valence electrons an atom has?

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? ab c d