Concrete column

The concrete column of the highway bridge has the shape of a block with dimensions of 1m x 0.8m x 25m. It should be lifted by crane to a height of 20m. What is the power of his engine if the lifting takes 2 minutes?

Correct answer:

P =  75.21 kW

Step-by-step explanation:

a=1 m b=0.8 m c=25 m  h=20 m  ρ=2300 kg/m3  V=a b c=1 0.8 25=20 m3 m=ρ V=2300 20=46000 kg  t=2 min s=2 60  s=120 s  g=9.81 m/s2  W=m g h=46000 9.81 20=9025200 J  W=Pt  P1=W/t=9025200/120=75210 W  P=P1 kW=P1:1000  kW=75210:1000  kW=75.21 kW=75.21 kW



Did you find an error or inaccuracy? Feel free to write us. Thank you!



avatar







Tips to related online calculators
Do you know the volume and unit volume, and want to convert volume units?
Tip: Our Density units converter will help you with the conversion of density units.
Do you want to convert mass units?
Do you want to convert time units like minutes to seconds?

Related math problems and questions: