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make coins coin was 2 mm and 2 cm respectively? The diameter and length of a roller is 120 cm and 84 cm respectively. To level the round, 200 rotations of the roller are required. Find the expenditure to level the ground at the rate of Rs. 10 per sq.m. indiameter and thickness of a hollow metals sphere are 12 cm and 0.01 m I rface

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Q1

The diameter and length of a roller is 120 cm and 84 cm respectively. To level the ground, 200 rotations of the roller are required. Find the expenditure to level the ground at the rate of Rs. 10 per sq.m.

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Q2

The diameter and length of a roller is 60 cm and 42 cm, respectively. To level the ground, 150 rotations of the roller are required. Find the expenditure to level the ground at the rate of ₹20 per sq m.

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Q3

A metal parallelopiped of measures 16 cm

\times

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Q4

A metal cuboid of measures

16 c m \times 11 c m \times 10 c m

was melted to make coins. How many coins were made, if the thickness and diameter of each coin was

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(π = 3.14)

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Q5

The diameter and thickness of a hollow metals sphere are 12 cm and 0.01 m respectively. The density of the metal is 8.88 gm per cm³. Find the outer surface area and mass of the sphere.

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