Question

Three forces of magnitudes 6 N, 6 N and $\sqrt { 72 }$N act at corner of cube along three sides as shown in figure. Resltant of these forces is

• A. 12 N angle OB
• B. 18 N along OA
• C. 18 N along OC
• D. 12 N along OE

Answer 1

Answer: (D)

12 N along OE

Answer 2

Resultant of these forces is

$R = \sqrt { ( 6 ) ^ { 2 } + ( 6 ) ^ { 2 } + \sqrt { ( 72 ) ^ { 2 } } }$ along OE

$= \sqrt { 36 + 36 + 72 } = 12 \mathrm {~N}$along OE