Answer:
its A i think im not sure tho
Explanation:
When light goes from one medium to another, it changes angle. This is why it will look bent.
If a theory is studied in let's say the 17th century, the theory has had many years to be studied and explained by many different people many different ways.
The force that holds the gases in the sun. The force that causes a ball you throw in the air to come down again
Answer:
A simple machine consisting of an axle to which a wheel is fastened so that torque applied to the wheel winds a rope or chain onto the axle, yielding a mechanical advantage equal to the ratio of the diameter of the wheel to that of the axle.