The part of circle x2 + y2 = 9 in between y = 0 and y = 2 is revolved about y-axis. The volume of generating solid will be
None of these
The lines and are coplanar and then equation to the plane in which they lie, is
x + y + z = 0
x - y + z = 0
x - 2y + z = 0
x + y - 2z = 0
If is
None of these
A.
Three forces of magnitudes 1, 2 and 3 dynes meet in a point and act along diagonals of three adjacent faces of a cube. The resultant force is
114 dynes
6 dynes
5 dynes
None of the above
The vectors AB = 3i + 5j + 4k and AC = 5i - 5j + 2k are side of a ABC. The length ofthe median through A is
5 units
10 units
Let a = 2i + j + k, b = i + 2j - 1, and a unit vector c be caplanar. If c is perpendicular to a, then c is