if the pointy thingy in your compass is pointing north, that means it's being (pulled toward) something near Earth's north pole
The width of the playroom is 4 m
Answer:
7 hours
Explanation:
The total charge contained in the battery is

And this is a charge, since it is a current multiplied by a time:

The current drawn by each headlight (which is the charge consumed per second) is

Since we have two headlight, the total current drawn is

Therefore, the total charge consumed by the two headlights each hour is

So, the time before the battery is dead is

An atomic nucleus . . .
-- contains all of the atom's positive charge
-- contains almost all of the atom's mass
-- contains none of the atom's negative charge.