a man 80kg carries a load of bricks of mass 20kg up a vertical ladder of length 6m what work has he done
Mass of man= 80kg, mass of brick= 20kg, distance= 6m.
Take g=10ms–². Total mass= 80+20=100kg
W=F*d.....but F=mg
W=mg*d
=(100*10)*6
=1000*6
=6000J
100 kg * 9.81 m/s^2 * 6 m
= 5886 Joules
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Calculate the linear expansivity of brass of length 120m that assumes a new length of 120.05m when heated through a temperature of 100degree
Linear expansivity (α) is given by the formula:
α = ΔL / (L0 * Δθ)
where ΔL is the change in length, L0 is the original length, and Δθ is the change in temperature.
Given: L0 = 120 m, ΔL = 0.05 m, Δθ = 100°C
α = ΔL / (L0 * Δθ)
= 0.05 / (120 * 100)
= 4.17 x 10^-6 /°C
Therefore, the linear expansivity of brass is 4.17 x 10^-6 /°C.