Which science will PLEASE HELP ME

discuss how matter is created throughout the universe?
1 Astronomy
2 Zoology
3 physics
4 Chemistry

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?

Aracecar driver has to hold on tightly when going around a banked curve. approximately what is the centripetal force on a 2220.0 kg car going around a circle with a diameter of 190.0 meters at 25.0 m/s?

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?