The crane lifts the load at a speed of 0.5 m / s. What is the weight if the crane performs work of 1.2 MJ in 1 minute?
| September 14, 2021 | education
V = 0.5 m / s.
g = 10 m / s2.
t = 1 min = 60 s.
A = 1.2 MJ = 1.2 * 10 ^ 6 J.
m -?
A = m * g * h.
h = V * t.
A = m * g * V * t.
m = A / g * V * t.
m = 1.2 * 10 ^ 6 J / 10 m / s2 * 0.5 m / s * 60 s = 4000 kg.
Answer: m = 4000 kg.
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