Magnitudes of vectors are 3, 4, 5 respectively. If and are mutually perpendicular, then magnitude of is
The differential equation of all circles which passes through the origin and whose centre lies on y-axis is
A sphere S1 impings directly on an equal sphere S2 at rest. If the coefficient of restitution is e, then the velocities of S1 and S2 are in the ratio
If = 0 and the vectors are non- coplana, then abc is equal to
0
- 1
1
None of these
B.
- 1
The magnitude of the two forces forming a couple is 36 N each and the arm of the couple is 4m. The magnitude of each force of an equivalent couple whose arm is 9m, is (in Newtons)
18
26
16
15