C. A complete revolution is 360 degree. two revolution is 720.
Is impossible say how many stars are in the sky haha
When the ruler is broughı near the inetal knob, it repels electrons in the metal. Electrons move away froni the ruler and down the metal rod. The knob now has a positive charge. The thin pieces of metal foil at the bottom of the metal rod now have a negative charge.
False not radioactive isotope will have a half-life
