Physics

Problem

4\,\text{kg}

block rests on a rough

30^{\circ}

incline that is fixed inside an elevator. The coefficient of static friction between the block and the incline is

0.6

. The elevator is moving upward with a constant acceleration of

5\,\text{m}\,\text{s}^{-2}

. Take

g = 9.8\,\text{m}\,\text{s}^{-2}

. The block remains at rest relative to the incline. What is the magnitude of the normal reaction exerted by the incline on the block? a)

43\,\text{N}

59\,\text{N}

51\,\text{N}

34\,\text{N}