As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. There is no one a
round to help, so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. You pull up on the rope to lift the box.
Answer: Machines according to Wikipedia is "a mechanical structure that uses power to apply forces and control movement to perform an intended action. Machines can be driven by animals and people, by natural forces such as wind and water, and by chemical, thermal, or electrical power, and include a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement ".
A pulley is a wheel on an axle or shaft that is created to support movement, it makes carry loads easier.
A pulley is a simple type of machine, which in the above explained case makes carrying a load easier.
The hotter star will be 16 times more luminous - luminosity depends on two things - the size of the star and the temperature of the star. The hotter a star is, the more energy it will give out. This will give rise to greater luminosity.
Sorry for answering late! The definition of Fusion is <span>the process or result of joining two or more things together to form a single entity. So that means its False :) </span>
