Answer:
Since the ball becomes positively charged, it will repel as like charges repel.
20/40=0.5 g/cm^3 becuase, mass/volume=density.
As per Newton's III law every action has equal and opposite reaction
So here we can say that
every body which apply force on other body must have a reaction force of same magnitude in opposite direction
So here if ball hits the ground by 50 N force then the ball must have a reaction force on itself with same magnitude and opposite direction
the magnitude of the force will be 50 N
and its direction is opposite to the force that ball apply on the floor
False. That description fits the wave's 'frequency'.
It has nothing to do with refraction.
Beaker would be most appropriate for measuring the approximate volume of a liquid.
