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Standard VIII

Mathematics

Compound Variation

In a gym, in ...

Question

In a gym, in one exercise you have to continuously toss solid cylindrical dumbbells and catch them. Cylindrical dumbbells are of length 1 m and base diameter also 1 m. If density of the material used is 4 kg per $m^{3}$ , then the weight tossed is ___.

3.14 kg

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π / 2

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4 π k g

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12.56 kg

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Solution

The correct option is A 3.14 kg
Length of cylinder= 1 m
diameter = 1 m. radius=0.5m
Volume of the cylinder=
$V = Π r^{2} h$
$V = Π {0.5}^{2} * 1 = 0.79 m^{3}$
density=4 kg per $m^{3}$
Mass= Volumedensity=40.79=3.14Kg
Answer (A) 3.14 kg

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In a gym, in one exercise you have to continuously toss solid cylindrical dumbbells and catch them. Cylindrical dumbbells are of length 1 m and base diameter also 1 m. If density of the material used is 4 kg per m3, then the weight tossed is ___.

The correct option is A 3.14 kgLength of cylinder= 1 m diameter = 1 m. radius=0.5mVolume of the cylinder=V=Πr2hV=Π0.52∗1=0.79m3density=4 kg per m3Mass= Volume*density=4*0.79=3.14KgAnswer (A) 3.14 kg

In a gym, in one exercise you have to continuously toss solid cylindrical dumbbells and catch them. Cylindrical dumbbells are of length 1 m and base diameter also 1 m. If density of the material used is 4 kg per $m^{3}$ , then the weight tossed is ___.

The correct option is A 3.14 kg
Length of cylinder= 1 m
diameter = 1 m. radius=0.5m
Volume of the cylinder=
$V = Π r^{2} h$
$V = Π {0.5}^{2} * 1 = 0.79 m^{3}$
density=4 kg per $m^{3}$
Mass= Volumedensity=40.79=3.14Kg
Answer (A) 3.14 kg