What methods of charging does john use?

john charges the rod through induction, then charges the electroscope through friction.
john charges the rod through conduction, then charges the electroscope through induction.
john charges the rod through friction, then charges the electroscope through induction.
john charges the rod through friction, then charges the electroscope through conduction.

Which statement best describes who the period and frequency of electromagnetic was change between gamma rays and microwaves? a) the period and frequency stay the same. b) the period increases and the frequency decreases. c) the period decreases and the frequency increases. d) the period increases and the frequency increases.

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?

The law of reflection states that the angle of reflection is equal to the angle of