When using a real machine to do work, input work will always be

Explanation:

In physics, simple machines must have a efficiency rate that is measured depending on how much energy needs to work, and how much energy is released (input - output).

In real machines, to have efficiency they must do work with less energy possible. So, good efficiency in real ones should imply that input work is less than output work, because in the other way machines don't make sense.

For example, steam locomotive, imagine that the input work is the same as output work. This situation don't make sense, because is impossible for a human being to do that, it requires to much effort.

So, the sense of a machine is that input work is less than output work.

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2