1]If A = B+C and the magnitude of A, B and C are 5,4,3 unit, the angle between A and B is :
(a)cos-13/5 (b) cos-14/5
(c)π/2 (d) sin-1 3/5
2] Unit vector parallel to the resultant of vectors 4i – 3j and 8i + 8j and 8i + 8j will be:
(a) (24i+5j)/13 (b) (12i+5j)/13
(c) (6i+5j)/13 (d) none of these
3] A force of 6 N and another of 8 N can be applied together to produce the effect of a single force of:
(a) 1 N (b) 11 N
(c) 15 N (d) 20 N
4] Two vectors having equal magnitudes A make an angle ? with each other. The magnitude and direction of the resultant are respectively:
(a) 2Acos ? /2, along bisector
(b) A cos ?/2, at 45 from one vector
(c) A cos ?/2, along bisector
(d) A sin ?/2, along bisector
1]If A = B+C and the magnitude of A, B and C are 5,4,3 unit, the angle between A and B is :
(a)cos-13/5 (b) cos-14/5
(c)π/2 (d) sin-1 3/5
2] Unit vector parallel to the resultant of vectors 4i – 3j and 8i + 8j and 8i + 8j will be:
(a) (24i+5j)/13 (b) (12i+5j)/13
(c) (6i+5j)/13 (d) none of these
3] A force of 6 N and another of 8 N can be applied together to produce the effect of a single force of:
(a) 1 N (b) 11 N
(c) 15 N (d) 20 N
4] Two vectors having equal magnitudes A make an angle ? with each other. The magnitude and direction of the resultant are respectively:
(a) 2Acos ? /2, along bisector
(b) A cos ?/2, at 45 from one vector
(c) A cos ?/2, along bisector
(d) A sin ?/2, along bisector
