1.

What is the maximum value of the force F such that the block shown in the arrangement, does not move?

Answer»

`20N`
`10 N`
`12 N`
`15 N`

Solution :`F= mu R= mu (W +F sin 60^@ ) `
` F cos 60^@= mu(W + Fsin 60^@60 ^@ )`
SUBSTITUTING`mu = (1)/(2 sqrt(3))andW= 10sqrt(3), ` weget ` F=20 N`


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