cos-1 5/12
cos-1 5/13
cos-1 12/13
cos-1 7/13
3
4
9
13
are two vectors and θ is the angle between them, if the value of θ is
60o
45o
30o
90o
Rain is falling vertically with a speed of 30 ms-1. A man rides a bicycle with a speed of 10 ms-1 in north to south direction. The angle with the vertical at which the man should hold his umbrella to protect himself from the rain is:
None of these
If a vector is perpendicular to the vector , then the value of α is
-1
1/2
-1/2
1
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
Two quantities A and B have different dimensions. Which mathematical operation given below is physically meaningful?
A/B
A + B
A - B
None
0o
Minimum number of unequal vectors which can give zero resultant are:
Two
Three
Four
More than four
The value of p so that vectors and are perpendicular is
6
2
