Approximately how long does it take a star the size of the sun to become a red giant?
a) 2 million years
b) 10 million years
c) 45 billion years
d) 25 million years

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present

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