ICSE Class 10 Physics 2020 Solved Paper

Question : 9 of 67

Marks: +1, -0

A crane 'A' lifts a heavy load in 5 seconds, whereas another crane '

B

' does the same work in 2 seconds. Compare the power of crane '

A

' to that of crane '

{B}

Solution:

\;{\;\text " Power of crane A "\;}/{\;\text " Power of crane "\; B}=\;{\;{\;\text " Work done by crane A "\;}/{\;\text " Time taken by A "\;}}/{{\;\text " Work done by crane B "\;}/{\;\text " Time taken by B "\;}}

\;=\;{\;\text " Work done by A "\;}/{\;\text " Work done by B "\;} × \;{\;\text " Time taken by B "\;}/{\;\text " Time taken by A "\;}

\;=\;{1}/{1} × \;{2 {\ sec}}/{5 {\ sec}}

\;=2: 5

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