Labeled Picture Of A Sewing Machine Anyone Know Science Very Well Please Help Me!?

Anyone Know Science Very well please help me!? - labeled picture of a sewing machine

I have a scientific study is very important, please answer the following questions! Sorry for a king long!

1.What is the difference between input and is produced to (the work is an example, because the question is whether an object weighs 6N to do much work to get a height of 0.5 meters head of the Toa are necessary force is 6N . The way to resolve this problem, and more examples)

2.What is the scientific significance of the corner?

3.Si it gives you something to tell on the label for the expense, and as the resistance is presumed to know what label (please give an example with a photo if you can)

4.Si you can give a simple definition of arm strength and arm strength? (The equation for the use of force in the arms equation, when the arms of the resistance equation? Write a reviewPLE for each, please!)

4. What is the scientific importance of the density and mass?

5. One issue is the density of copper 9g/cm3 find a wealth of 5cm3 and volume 63rd ? (This question has to find the mass, but why did the second volume equation was also used? Explain yourself! Please give me more examples like these, with the answer, thanks!)

6.A mass of 2 kg is placed on a horizontal surface. Contact area is 50cm2 surface pressure at the surface 0.04kg/cm2 (explain why the answer, please show me how to find the answer)

7.in the machines of the following tools / have made no great period of a relatively small force available?
A. a hammer nails \\ \\ \\ \\ \\ \\ \\ \\ consider u0026lt;br> B with a pair of pliers
C. foot on the pedal of a sewing machine
D. a pair of scissors
(Why did you have for this answer?)

Any answer is very grateful Please help me, I must take this test! Thank you for your help!