A lever of length 1m has been used to lift a load of 600N by applying an effort of 200N. If load is at 20cm from fulcrum, calculate mechanical advantages, velocity ratio and efficiency solve numerical problem

1) The Mechanical Advantage of the lever is 3

2) The velocity ratio of the lever is 4

3) The efficiency of the lever is 75%

Explanation:

A lever is a simple machine that is used to lift a heavy load with a little effort or force

The mechanical advantage is the ratio of the force output to the force input

The given parameters of the lever are;

The length of the lever = 1 m

The weight of the load (force output), = 600 N

The effort applied (force input), = 200 N

1) The Mechanical Advantage, MA of the lever is given as follows;

The Mechanical Advantage, MA of the lever = 3

2) The velocity ratio, V.R., is the ratio of the distance moved by the effort, , to the distance moved by the load,

For the lever, we have;

The distance of the load from the fulcrum, = 20 cm = 0.2 m

Therefore, we have;

The distance of the effort from the fulcrum, = 1 m - 0.2 m = 0.8 m

From which we have;

The velocity ratio of the lever = 4

3) The efficiency, η, is given as follow;

The efficiency of the lever is 0.75 or 75%.

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

yup its correct its: c) b b