Two forces `P` and `Q` act at an angle of `120^(@)` with each other. If the resultant is at right angles to `P` and `P` is equal to `4kg-wt`, then the value of `Q` is

Two forces P=5N and Q=10N are acting at a point making an angle of 30^(@) with each other. What is the value of the dot product of P and Q ?

Two equal forces (P each) act at a point inclined to each other at an angle of 120^(@) . The magnitude of their resultant is

Two equal forces (P each) act at a point inclined to cach other at an angle of 120^(@) . The magnitude of their resultant is

Two forces P and Q acting at a point are such that if P is reveserd, the direction of the resultant is turned through 90^(@) . Prove that the magnitudes of the forces are equal.

Two forces P and Q acting at a point are such that if P is reveserd, the direction of the resultant is turned through 90^(@) . Prove that the magnitudes of the forces are equal.