A spherical balloon is being inflated at the rate of 35 cc/min. The rate of increases of the surface area ofthe balloon when its diameter is 14cm, is
7 sq cm/min
10 sq cm/min
17.5 sq cm/min
28 sq cm/min
If be vectors such that and , then is equal to :
47
- 47
0
- 25
D.
- 25
The equation of the plane through the point (2, - 1, - 3) and parallel to the lines and is :
8x + 14y + 13z + 37 = 0
8x - 14y + 13z + 37 = 0
8x + 14y - 13z + 37 = 0
8x + 14y + 13z - 37 = 0
If for a plane, the intercepts on the co-ordinate axes are 8, 4, 4, then the length of the perpendicular from the origin on to the plane is :
3