Question 1 (1 point)
Arrange these fuels in increasing order of energy given off per gram when they are
burned.
1. gasoline
2. hydrogen
3. coal
4. ethanol
1.2.3.4
2.1.3.4
4.3.1.2
3,1,2,4

Mike walks 100 meter north, then walks 30 meters south. after this, he walks another 10 meters north. what is the magnitude of his total displacement during this walk,in meters?

Idon’t quite understand this problem

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?