A light source 1 m away from an opening which is 1 square meter will cover 4 m2 when it is 2-m away from the opening. How many square meters will it cover
when it is 3 m away? What will be the intensity of the light when it is 3 n away ?

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

Avoltaic cell converts chemical energy to

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?