If a,b,care unit vectors such that a+b+c=0,then write the value of ab˙+bc˙+⋅a˙
Find the resultant of two velocities 4 m/sec and 6 m/sec inclined to one another at an angle of 120°.
Suppose that p,qandr are three non-coplanar vectors in R3. Let the components of a vector s along p,qandr be 4, 3 and 5, respectively. If the components of this vector s along (−p+q+r),(p−q+r)and(−p−q+r) are x, y and z, respectively, then the value of 2x+y+z is
Two forces act at a point and are such that if the direction of one is reversed, the resultant is turned through a right angle. Show that the two forces must be equal in magnitude.