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10-01-2024
Mathematics

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A plank of mass 20kg is pulled, with a rope, up a slope inclined at 15 degrees to the horizontal. The rope is inclined at 30 degrees as shown in the diagram.
a) Explain why the tension in the rope must certainly be greater than 53.6N
The tension in the rope is 65N and the plank is moving at constant speed. Calculate
b) the magnitude of the normal contact force exerted on the plank by the ground,
c) the magnitude of the frictional force

I did A but cannot figure out B or C.
A is sin(75) = 200sin15/x and solving x gives you approx. 53.6

A plank of mass 20kg is pulled with a rope up a slope inclined at 15 degrees to the horizontal The rope is inclined at 30 degrees as shown in the diagram a Expl class=

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