Arock exerts 5000 pa of pressure on the ground. if the rock weighs 250 n, how much area is in contact with the ground?
8 m2
50 m2
20 m2
0.05 m2

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.

In order for the bug to fly through the air a force has to push the bug forward. identify this force. how does the bug produce

What are atoms of the same element with varying number of neutrons