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Suppose you have a stretching machine which could stretch almost anything. For example, if you put a 5 metre stick into a (× 4) stretching machine (as shown below), you get a 20 metre stick.

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Question

Suppose you have a stretching machine which could stretch almost anything. For example, if you put a 5 metre stick into a (× 4) stretching machine (as shown below), you get a 20 metre stick. Now if you put 10 cm carrot into a (× 4) machine, how long will it be when it comes out?

Sum
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Solution

According to the question, if we put a 5 m stick into a (× 4) stretching machine, then machine produces 20 m stick.

Similarly, if we put 10 cm carrot into a (× 4) stretching machine, then machine produce 10 × 4 = 40 cm stick.

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Chapter 8: Exponents and Powers - Exercise [Page 265]

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NCERT Exemplar Mathematics Exemplar [English] Class 8
Chapter 8 Exponents and Powers
Exercise | Q 147. | Page 265

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This table shows the mass of one atom for five chemical elements. Use it to answer the question given.

Element Mass of atom (kg)
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Lead 3.44 × 10–25
Silver 1.79 × 10–25
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  1. Which is the heaviest element?
  2. Which element is lighter, Silver or Titanium?
  3. List all five elements in order from lightest to heaviest.

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