1.

When a force of 6.0 N is exerted at 30° to a wrench at a distance of 8 cm from the nut, it is just able to loosen the nut. What force F would be sufficient to loosen it if it acts perpendicularly to the wrench at 16 cm from the nut.?

Answer»

Given in the question :- Refer to the attachment


Force of 6N is ACTING on a BODY with the ANGLE 30°, Now we have to resolve the force of 6 N along the wrench and perpendicular to it.

P = 6. cos 30^


Now, Total TORQUE working on point A = 0

Hence The force component which is perpendicular to the wrench

then

P' =6 sin30^0

P' =3.0 N


The torque ( nut ) = 3.0 × 8/100

=0.24 N-m----(i)


The torque of force F (nut)

= F× 16/100 N-m------(II)


Equating the two we get,


F * 16/100 =0.24

F = 24/16

F =3/2

F=1.5 N



Hope it Helps :-)



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