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An electrician uses rubber gloves while repairing an electric switch at home because it is an insulator and saves him from all the electric shocks.

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Let the width of the rectangle be x<div>Therefore, the length of the rectangle is 2x.</div><div>
</div><div>Given, the perimeter is 36 </div><div>
</div><div>Perimeter =2(w+l)</div><div>=2(x+2x)=36</div><div>⇒2(3x)=36</div><div>⇒6x=36</div><div>⇒x=6⇒ Width</div><div>2x=12⇒ Length</div><div>
</div><div>Therefore, the length of the rectangle is 12cm and width is 6cm.</div>

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Total students= 240

Percentage of boys who voted =80%

No. Of boys who vote= 80/100×240= 192

Therefore, 192 boys students actually voted.

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Yes friction produces heat. <div>

Example- 1. Rubbing of your both hands together to keep them warm in winter season So, when we rub both the hands it produces heat.

2. Rubbing of sticks or stones together to produce fire.

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