Question

3. What is a pulley and what can it be used for?
4. Which planets are known as gas giants and why?


for class n4​

Answer 1

Explanation:

A pulley is a mechanical device that can be used to lift heavily objects more easily. Pulleys consist of a wheel that rotates on an axle—which is a rod through the center of the wheel—and a rope, cable, or chain. There are three main types of pulleys: fixed, movable, and compound

Answer 2

Explanation:

1. pulley is a piece of equipment, consisting of a wheel and a rope, that is used for lifting heavy things.... Pulleys are powerful simple machines. They can change the direction of a force, which can make it much easier for us to move something. ... Pulleys can also provide us with a mechanical advantage when we use several together and more rope. This process lessens the amount of force required to lift something.