The atomic mass of carbon-13 is 13. it has six protons. how many neutrons does this isotope have? 6 7 13 19

A2000 kg car is rounding a curve of radius 200 m on a level road. the maximum frictional force the road can exert on the tires of the car is 4000 n. what is the highest speed at which the car can round the curve?

What happens when a rubber rod is rubbed with a piece of fur?

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false