The crane evenly lifts a granite slab with a volume of 1.5 m3 to a height of 4 m.

The crane evenly lifts a granite slab with a volume of 1.5 m3 to a height of 4 m. What kind of work does it do? The density of granite is 2600 kg / m3

Find: A
Given:
V = 1.5m ^ 3
h = 4m
p = 2600kg / m ^ 3
g = 10H / kg
Decision:
The work is found by the formula:
A = Fh
F = mg
m = pV
We substitute everything into the general formula:
A = pVgh
A = 2600 * 1.5 * 10 * 4 = 156000 (J) = 156 (kJ)
Answer: 156 kJ