Of the following metals, which is the most reactive? a. li b. be c. na d. mg

What is the length x of the side of the triangle below? (hint: use the cosine function)

While you are driving in the lane next to the curb on a multi-lane road the car on your left suddenly moves toward you lane. they are about toy crash into your front fender. you

Which of the following is the main energy source for the sun? a. fission of hydrogen b. fusion of hydrogen c. fusion of helium d. fission of iron