Question
Physics Question on laws of motion
P,Q and R are three coplanar forces acting at a point and are in equilibium. Given P=1.9318kgwt [sinθ1=0.9659], the value of R (in kg wt) is
A
0.9659
B
2
C
1
D
44563
Answer
1
Explanation
Solution
Using Lami's theorem, we have sinθ1P=sin150∘R ⇒sinθ1P=sin(180∘−30∘)R ⇒0.96591.9318kgwt=1/2R ⇒R=0.96591.9318×21kgwt=1kgwt.