A wave that consists of a combination of electrical and magnetic energy is a (n) :

How does the law of conservation of mass apply to this reaction: Mg + HCl → H2 + MgCl2? The equation needs to be balanced. There are fewer hydrogen atoms in the equation than magnesium or chlorine. Only the hydrogen needs to be balanced.

Mass is a measure of weight. True False

Isotopes of an element have a different number of: protons neutrons electrons all of the above

Which of the following statements about rest and physical activity is NOT true? a. You should rest as little as possible because it interferes with training. b. You should allow muscle groups a chance to rest between workouts. c.

What would happen to the moon if earth stopped exerting the force of gravity on it

In order for convection to occur, you must have

Explain Newton's First Law for the following. If you walk across the room holding a ball, when should you drop it to ensure that it lands on a target? Before, after or when you are directly on the target?

In what way are all forms of potential energy the same?

Enise is riding her bike and falls to the ground. During the collision, she hits both grass and cement. Which best explains why Denise had fewer injuries to the area of her body that hit the grass?

A rock is dropped into the Grand Canyon. It takes 18 seconds to hit the bottom. Calculate how deep the canyon is.