Question

PHYSICS (11th):
1) If a vector has zero magnitude, is it meaningful to call it a vector?

2) Can three vectors, not in one plane, give a zero resultant? Can four vectors do?

3) Two forces while acting on a particle in opposite directions, have the reaultant of 10N. If they act at right angles to each other, the resultant is found to be 50N. Find the two forces.

Answer 1

1)yup but it is actually called null vector.
2)no, four vectors are required
3)30N AND 40N

Answer 2

1) it's a null vector
2) 4 vector can
3)
A+b = 50. ( Max)
A-b = 10. (Min ) adding both cancel b
2a = 60

A = 60÷ 2
A =30
Now a+ b = 50
B = 50 _ 30
B = 20