What are the negatives of changing to hydrogen powered cars?

How many days a week should ab children an teenagers get 60 minutes of physical activity

Winter tides in the northern hemisphere tend to be larger than summer tides mainly because

An apple falls out of a tree from a height of 2.3m. what is the impact speed of the apple

If you want to be an astronaut you should be in good health and have a degree in engineering, science, or math. Astronauts research important problems and preform exciting tasks while in space, including all of these BUT A) zero gravity research.

A sealed glass jar has a small amount of water on the bottom. the rest of the volume in the jar is taken up by helium gas at a partial pressure of 526 mmhg, and water vapor. if the total pressure inside the jar is 760.

Can hand sanitizer be used as rubbing alcohol

Two objects experience a 12 N electrical force between them. What force will the objects experience if the distance between them is doubled?

a submarine moving directly upward in the water at constant speed. The weight of the summer and it is 500,000 N. The submarines motors are off. The magnitude of the buoyant force acting on the submarine is

If the car went 30 km west in 25 min. and then 40 km east in 35 min., what would be its total displacement?

Which of the following is not the name of a space station that was in orbit around Earth?