1 Which device can only be used for heating a space?
an air conditioner
a heat pump
a furnace
a heat engine

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.

Answerthe distance between the two ends of the galaxy is 150,000 light years;

Ive never heard of creep meters