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A crane lifts a 450 kg concrete to the top of a 50 m building in 5 s. Assuming g= 10 m/s ) 2 a) The potential energy of the concrete. , calculate; b) The power developed by the crane
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13 votes
13 votes
A crane lifts a 450 kg concrete to the top of a 50 m building in 5 s.

Assuming g= 10 m/s
)
2
a) The potential energy of the concrete.
, calculate;
b) The power developed by the crane

User Eballeste
by
2.5k points

1 Answer

17 votes
17 votes

Step-by-step explanation:

Given : m=600kg h=20 m

Time of operation t=2 min =120 s

Work done in lifting a box W=mgh=600×10×20=120000

Power required P=

t

W

=

120

120000

=1000 watts

User Ruth Young
by
2.9k points
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