How many protons are in an atom of tin?

E. m. f physical dimension

Anna learned that every magnet has a north and a south end called poles. One day, while she is playing with magnets she notices that when she puts the north end of a magnet near the south end of another magnet, they pull together.

How and why does a day measured with respect to the Sun differ from a day measured with respect to the stars?

What changs occurs in the core of a massive starbpreceding a supernova?

What areas of a magnet have the strongest magnetic effect

Which represents a system that is almost completely closed?

If many household substances classify as acids or bases what is the ph scale

A protostar forms once the nebular cloud condenses and the core begins

How do whales bats and dolphins use echolocation? A To scare away predators B To attract mates C To orient them selves and find food D To tell animals of there species where they are

How much force would be needed to move a car with the mass of 100kg to an acceleration of 5m/s/s?