70\ 10.5 Blocks

A,B

, and

C

below have masses of

40kg,35kg

, and

30kg

, respectively. The coefficients of static friction are 0.35 between blocks

A

and

B,0.30

between blocks

B

and

C

, and 0.25 between block

C

and the plane. As

\\\\theta

is slowly increased from

0\\\\deg

, determine which block will begin to slide first and the corresponding value of

\\\\theta

. (Ans. Block

C

will slide first at

\\\\theta =14\\\\deg

)

10.5 Blocks A, B, and C below have masses of 40kg,35kg, and 30kg, respectively. The coefficients of static friction are 0.35 between blocks A and B,0.30 between blocks B and C, and 0.25 between block C and the plane. As is slowly increased from 0, determine which block will begin to slide first and the corresponding value of . (Ans. Block C will slide first at =14 )