A body of mass 2 kg is being dragged with uniform velocity of 2 m/s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 s is V = 4.2 J/cal and g=9.8 m/s2 )

Question

A body of mass 2 kg is being dragged with uniform velocity of 2 m/s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 s is V = 4.2 J/cal and g=9.8 m/s2 ) (A) 9.33 cal (B) 10.21 cal (C) 12.67 cal (D) 13.34 cal

Tardigrade Admin · Accepted Answer

Work done = Force × Displacement W=μ mg× (v× t) W=(0.2)× 2× 9.8× 2× 5 W=39.2 J Heat generated, Q=(W/J) =(39.2/4.2) =9.33 cal

Q. A body of mass 2 kg is being dragged with uniform velocity of 2 m/s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 s is V = 4.2 J/cal and $g = 9.8 m / s^{2}$ )

9.33 cal

10.21 cal

12.67 cal

13.34 cal

Work done = Force $\times$ Displacement $W = μ m g \times (v \times t)$ $W = (0.2) \times 2 \times 9.8 \times 2 \times 5$ $W = 39.2 J$ Heat generated, $Q = \frac{W}{J}$ $= \frac{39.2}{4.2}$ $= 9.33 c a l$

Q. A body of mass 2 kg is being dragged with uniform velocity of 2 m/s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 s is V = 4.2 J/cal and g=9.8m/s2 )