Suppose there is a 2600kg stone block on a ramp inclinded at 12 degrees to the horizontal.Assume that each worker can exert a pulling force of magnitude at most 360 newtons.(adsbygoogle = window.adsbygoogle || []).push({});

a) Determine the number of workers it would take to hold the stone block at rest

b)Although lubrication can reduce friction, it cannot eliminate it. Assume that

the magnitude of the static friction exerted by the ramp on the stone block

is 2560 N. Taking into account the friction acting upwards along the ramp

(reducing the tendency of the block to slide down the ramp), how many men

are required to hold the block at rest?

Ok, so for a,

mg* cos 12

=24923 N

Divide it by the amount a worker can pull

= 70

Is that right?

For b, I am stuck.....I have no idea where to start

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# Homework Help: Inclined plane

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