is a vector with magnitude A, then the unit vector in the direction of is
1.
2.
3.
4.
If , then the direction cosines of the vector are:
(direction cosines (or directional cosines) of a vector are the cosines of the angles between the vector and the three +ve coordinate axes.)
1.
2.
3.
4.
The vector that must be added to the vector and so that the resultant vector is a unit vecotr along the y-axis is
1.
2.
3.
4. Null vector
Surface area is:
1. Scalar
2. Vector
3. Neither scalar nor vector
4. Both scalar and vector
A force \(\mathrm{F}\) applied at a \(30^\circ\) angle to the \(\mathrm{x }\)-axis has the following X and Y components:
1.
2.
3.
4.
Angular momentum is
1. A scalar
2. A polar vector
3. An axial-vector
4. None of these
If , then which of the following is NOT correct?
1.
2.
3.
4.
Which of the following is a scalar quantity
1. Displacement
2. Electric field
3. Acceleration
4. Work
There are two force vectors, one of 5N and the other of 12N. At what angle should the two vectors be added to get the resultant vector of 17N, 7N, and 13N, respectively:
1.
2.
3.
4.
If and then magnitude and direction of will be
1.
2.
3.
4.