Minimum number of unequal vectors which can give zero resultant are:
Two
Three
Four
More than four
A rod of length PQ = l leans by its upper end against a smooth vertical wall while its end leans against the base. The end Q of the rod moves uniformly downward with speed v1. The end P will move on the floor with velocity v2 such that :
v2 is uniform and v2 = v1
v2 is uniform but v2 ≠ v1
v2 continuously increases
v2 continuously decreases
Given that and makes angle α and β with and respectively, then which of the following is correct
α cannot be less than β
α < β if P < Q
α < β if P > Q
α < β if P = Q
The vectors are such that then angle between the two vectors will be
45o
60o
75o
90o
0o
30o
The force acting on a body of 10 kg is N. If the body is initially at rest, then velocity at the end of 20 sec will be (in m/s).
2√6
6√2
3√2
2√3
(A2 + B2 + AB)1/2
(A2 + B2 + AB/√3)1/2
A + B
(A2 + B2 + √3 AB) 1/2
cos-1 5/12
cos-1 5/13
cos-1 12/13
cos-1 7/13
180o
None
A vector of magnitude a is rotated through angle θ. The magnitude of change in the vector is
2a sin θ
2a cos θ