Physics

Problem

150\,\text{kg}

loaded sled is pulled along level snow at a constant speed of

2.0\,\text{m}\,\text{s}^{-1}

by a rope that makes a

30^{\circ}

angle above the horizontal. The coefficient of kinetic friction between the sled and the snow is

0.10

. What minimum mechanical power must be supplied through the rope to keep the sled moving at this speed? a)

1.4\times10^{3}\,\text{W}

2.8\times10^{2}\,\text{W}

3.2\times10^{2}\,\text{W}

1.4\times10^{2}\,\text{W}