a lifting machine is used to lift a load up to a height of 800mm when an effort moves through a distance of 4 m

and, of course, the question is?

the mass of the machine is?

To determine the mechanical advantage (MA) of the lifting machine in this scenario, we need to know the load and effort involved.

The mechanical advantage (MA) of a lifting machine is defined as the ratio of the load lifted to the effort applied. It gives us an idea of how much easier the machine makes it to lift a load compared to lifting it directly.

In this case, we are given that the effort (E) moves through a distance of 4 meters and lifts the load (L) up to a height of 800mm (or 0.8 meters). Let's calculate the mechanical advantage:

MA = L / E

First, we need to convert the load height to meters:
Load Height = 0.8 meters

Next, we can substitute the values into the formula:
MA = 0.8 meters / 4 meters

Dividing these values gives us:
MA = 0.2

Therefore, the mechanical advantage of the lifting machine in this scenario is 0.2.

Explanation:
To get the mechanical advantage of the lifting machine, we use the formula MA = load (L) / effort (E). We were given the load height (0.8m) and the distance the effort moves (4m). By substituting these values into the formula and performing the division, we find that the mechanical advantage is 0.2.