Question

In this question, you will have to use the equation for density as well as the equation for pressure. The picture shows a concrete beam lying on the ground. 0.5 m 6.4 m 0.5 m a Calculate the volume of the beam.
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Answer 1

Answer:

Correct option is

B

1440 kJ

m=v*density

m=6×4×2×1.5×103=72×103kg

when face with large area is in contact with the ground its height is 2m

Centre of mass is at a height of 1m

when face with small area is in contact with the ground its height is 6m

Centre of mass is at a height of 3m

W=72×104(3−1)=1440kJ