# A bucket of sand with a mass of 24.5 was raised using a fixed block not 10 m high

March 30, 2021 | education

| **A bucket of sand with a mass of 24.5 was raised using a fixed block not 10 m high, acting on the rope with a force of 250N. Calculate the efficiency of the installation.**

Let us find the perfect work Ac, if a bucket of sand with a mass of m = 24.5 kg was lifted with the help of a stationary block to a height of H = 10 m:

Ac = m * g * H = 24.5 * 10 * 10 = 2450 J.

Let us find the expended work Az, if a force F = 250 H was applied to raise the bucket:

Az = F * H = 250 * 10 = 2500 J.

Let’s find the efficiency of the block:

Efficiency = Ac * 100% / Az = 245000/2500 = 98%.

Answer: The efficiency of the fixed block is 98%.

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