ICSE Class 10 Physics 2017 Solved Paper

Question : 4 of 65

Marks: +1, -0

If the power of a motor be

100 {\KW}

, at what speed can it raise a load of

50,000 {\N}

Solution:

Given : Power

=100 {\kW}=100 × 1000=10^5 {\W}

.
Load (or Force)

=50,000 {\N}

, Speed

=

?
We know,

\;\text " Power "\;\;=\;\text " Force "\; × \;\text " Average Speed "\;

∴ \;\text " Average speed "\;\;=\;{\;\text " Power "\;}/{\;\text " Force "\;}=\;{10^5}/{50,000}

\;=2 {\ms}^{-1}

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