A pump is to raise 100 litre of water a height of 1.2 m in 10s. Calculate the power required assuming 1 litre of water has a mass of 1 kg. ?

1 Answer
Junaid Mirza
Apr 13, 2018

#"117.6 Watt"#

Explanation:

Work done to raise the water is

#"W = mgh"#

  • Mass of water #"(m) = 100 kg"\ [∵ "1 kg = 1 L"]#
  • Acceleration due to gravity #"(g) = 9.8 m/s"^2#
  • Height to which water is raised #"(h) = 1.2 m"#

#"W = 100 kg × 9.8 m/s"^2 × "1.2 m" = "1176 Joule"#

Power is given by

#"P" = "Work"/"Time"#

#"P" = "1176 Joule"/"10 s" = color(Green)"117.6 Watt"#

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