A submarine uses a sonar to measure the depth of water below it Reflected sound waves are detected 0.40s after they are transmitted. How deep is the water?(Speed of sound in water=1500m/s

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

The air that we breath is made mostly of which gaseous molecule

You are standing on a boat. which of the following strategies will make the boat start moving? a. pushing the mast b. throwing some cargo out of the boat c. pushing the front ofthe boat d. pushing another passenger