ME=work output/ work input x 100%
ME=42/50(100)
ME=84
Mechanical advantage is the greater outputted force than inputted force that is generated by using a machine. One example is pulling a pulley to create a much greater output force on the other side that a person could not lift without a pulley.
Output is not a color. It is the amount of something that is produced by a person, machine, or industry.
Mechanical energy
mechanical
Pulleys exist on wells to make it easier to remove the bucket. Once the bucket has gone down to the water, it is heavy and hard to lift straight up. So the pulley allows the person to pull down and/or at an angle to make the lifting easier. A block and tackle (a network of pulleys) could be used here to make the lifting even easier.
A mechanical advantage occurs when a tool such as a hammer is used that increases the amount of force being applied without increasing the effort of the person using the tool. To increase mechanical advantage, you could use a bigger hammer to increase output force.
This question of are pulleys a good science fair project is up to the person choosing the project. If you like it then you should do it. If not then don't do it. The choice is up to you.
The person's speed is 2 meters per second. The power required for him to accomplish that depends on his weight, on his efficiency of movement, on whether he's moving horizontally or vertically, etc., all of which the question neglects to specify.
Mechanical advantage is the greater outputted force than inputted force that is generated by using a machine. One example is pulling a pulley to create a much greater output force on the other side that a person could not lift without a pulley.
Output is not a color. It is the amount of something that is produced by a person, machine, or industry.
You can call a person who loves mechanical objects a mechanic. You can even call them Machinist, inventor or even an engineer depending on what type of mechanical devices they working on.
Mechanical energy
Increasing the number of pulleys divides the force required to lift up a heavy object; increasing the number of pulleys decreases the force needed by the person (or motor) pulling the first end of the pulley system. However, it is important to know that it does not affect the total work needed to lift up the object. As the force is decreased, the distance of rope needed increases to compensate for a conserved amount of work required for the load to be lifted.
Mechanical energy
Efficiency
A computer cannot output electricity. The only that could happen is if a person were to wire it to do so.
Explain input and output devices