[tex]i) cosecx^{2} 57-tanx^{2} 33°= ?
\\ii)\alpha -\beta = costheta\\[/tex]
iii)only correct
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W = - n m g h
Given data states that a laborer carries n bricks to a height h each of mass m. Therefore the work done will be given by the expression that is,
W = - Potential Energy ( P. E. )
Thereby, Potential energy is given by,
P. E. = m g h
\Rightarrow For each brick, we have P. E. = m g h and thereby for n bricks will be P. E. = n m g h
\Rightarrow Therefore, the work done is W = - n m g h,
where negative indicates work done against gravity, n is the number of bricks, m is the mass of each brick, g is the acceleration due to gravity and h is the height of the roof of the house.
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