Ascaffold of mass 40 kg and length 4.5 m is supported in a horizontal position by one vertical cable at each end. a window washer of mass 86 kg stands at a point 1.1 m from one end. what is the tension in the cable?

Explanation:

Given:

Here we consider the mass of the beam as uniformly distributed load concentrated at mid-span.

Using the schematic diagram:

Balancing forces:

..............................(1)

Balancing moment about point A:

......................................(2)

Putting value from eq. (2) into eq. (1)

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 .