8. An L -shaped bracket with sides of length 2L and L has two forces acting on i

Question

8. An L -shaped bracket with sides of length 2L and L has two forces acting on it, as shown in the drawing. One of the Poises has a magnitude F and the other has a magnitude 2F. The bracket is free to rotate about the point P shown. What is the magnitude and direction of the net torque acting on this bracket? Hint: by the right hand rule the sector direction for a counter clockwise torque is out the page. F A. 1.29LF. into the page B. 0.59LF. into the page C. I.29LF, out or the page I). 0.59/F, out of the page F. zero 45 A woman sits on a spinning piano stool with arms folded. When she extends her arms., which of the following occurs? A. She increases her moment of inertia, thereby increasing her angular speed H. She increases her moment of inertia. thereby decreasing her angular speed. C. She decreases her moment of inertia. thereby increasing her angular speed. I). She decreases her moment of inertia. There by decreasing her angular speed. F. Both her moment of inertia and her angular speed remain constant. 10. The horizontal bar in the figure will remain horizontal if:

Explanation / Answer

7 )

F in clockwise direction

2Fsin45 in ccw

t1 - t2

F*2L - 2F*sin45*L

= 0.59 FL

qns 8 )

I = mr^2

by spreadin her arms she increasing moment of interia

angular momentum remain conserve here so to keep constant angular velocity should be decrease

part 10 )

torque = r x F

M1R1 = M2R2

C option

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