A machine is used to lift a 100 kg stone to a vertical 20 m in 80 sec.
find the useful power of the machine. if the efficiency of the machine is 75%
, find the electrical power, being consumed by the machine.
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Mass=100kg
Vertical height,S=20metre
Time=20s to lift through distance S.
- Efficiency,n= 75%
- =0.75
By using the formula,
Power,p=work done/time taken
=W/t
since, W=force*️⃣ displacement
= F✖️S. or,F =mg
So,P=F✖️S➗ t ❎ 75%
= mass❎ gravity❎ S➗ t ❎ 0.75
= ❌ 9.8 ❌ 20➗ 80✖️ 0.75
=183.75 watt
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