A body of mass 2 kg is being dragged with a uniform velocity of 2 m/s on a rough horizontal plane. The co-efficient of friction between the body and the surface is 0.20, 4.2 J = 1 Calorie and $g = 9.8 m / s^{2}$ . The amount of heat generated in 5 seconds is

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Solution

Displacement S = (velocity $v$ $\times$ (time $t)$

$S = v \times t$

$∴ S = v t = 2 \times 5 = 10 m$

Q = workdone against frictional force (f)

$= (f) \times (S) = (μ m g) (S) = 0.2 \times 2 \times 9.8 \times 10 = 39.2 J$

Heat generated $= \frac{39.2}{4.2}$ Calorie $(∵ 4.2 J = 1 C a l)$

$= 9.33 C a l o r i e$

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A body of mass 2 kg is being dragged with a uniform velocity of 2 m/s on a rough horizontal plane. The co-efficient of friction between the body and the surface is 0.20, 4.2 J = 1 Calorie and g=9.8 m/s2. The amount of heat generated in 5 seconds is

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A body of mass 2 kg is being dragged with a uniform velocity of 2 m/s on a rough horizontal plane. The co-efficient of friction between the body and the surface is 0.20, 4.2 J = 1 Calorie and $g = 9.8 m / s^{2}$ . The amount of heat generated in 5 seconds is