A block of mass 5 kg starting from rest pulled up on a smooth inclined plane making an angle of with the horizontal with an effective acceleration of . The power delivered by the pulling force at from the start is ________ W. [Use ] (calculate the near

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Solution

Q.
A block of mass 5 kg starting from rest pulled up on a smooth inclined plane making an angle of $30 °$ with the horizontal with an effective acceleration of $1 {ms}^{- 2}$ . The power delivered by the pulling force at $t = 10 s$ from the start is ________ W. [Use $g = 10 {ms}^{- 2}$ ] (calculate the nearest integer value) [2023]

Ans.
(300)

$F - 5 \sin 30 ° = 5 a$

$\Rightarrow F = 5 + 25 = 30 N$

$v_{10} = u + a t$

$\Rightarrow v_{10} = 0 + 1 (10) = 10 m/s$

$P_{10} = F v = 300 W$

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