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Standard XII

Physics

Work Energy Theorem Application

A solid recta...

Question

A solid rectangular block of mass $200 k g$ has the dimensions $l = 2 m$ , $b = 1 m$ , $h = 0.5 m$ . It lies on a horizontal floor on sides $l$ and $b$ . The minimum work needed to turn it so that it lies on the sides $b$ and $h$ is:

z e r o

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1500 J

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3000 J

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2000 J

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Solution

The correct option is B $1500 J$
Work Done $= Δ (P . E)$
$= m g \frac{L}{2} - m g \frac{h}{2}$
$= m g (1 - 0.25)$
$= 200 \times 10 \times 0.75$
$= 1500 J$

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A solid rectangular block of mass 200kg has the dimensions l=2m, b=1m, h=0.5m. It lies on a horizontal floor on sides l and b. The minimum work needed to turn it so that it lies on the sides b and h is:

The correct option is B 1500JWork Done =Δ(P.E)=mgL2−mgh2=mg(1−0.25)=200×10×0.75=1500J

A solid rectangular block of mass $200 k g$ has the dimensions $l = 2 m$ , $b = 1 m$ , $h = 0.5 m$ . It lies on a horizontal floor on sides $l$ and $b$ . The minimum work needed to turn it so that it lies on the sides $b$ and $h$ is:

The correct option is B $1500 J$
Work Done $= Δ (P . E)$
$= m g \frac{L}{2} - m g \frac{h}{2}$
$= m g (1 - 0.25)$
$= 200 \times 10 \times 0.75$
$= 1500 J$