the great pyramid of khufu (giza, egypt) is about 140m tall. How much work would be required to raise an average - sized pyramid black (2.5 tons) to this height?

  3.43 MJ

Explanation:

The work required to raise a 2500 kg block to a height of 140 m is ...

  W = Fh = (mg)h

  = (2500 kg)(9.8 m/s²)(140 m) = 3,430,000 kg·m²/s²

  = 3.43 MJ

The work required is 3.43 megajoules.

Additional comment

Reportedly, a motivated human performing manual labor can sustain a power output of about 75 watts. At that rate, it would take about 12.7 hours of continuous effort for one person to lift the block to that height.

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explanation: