key for ls7812

. Only vector quantities of ………. kind may be added.

1. If D ⃗ =-4C ⃗, the magnitude of D ⃗ is ………. than that of C ⃗.
2. If A ⃗, B ⃗ and C ⃗ satisfy the equation A ⃗+B ⃗-C ⃗=0, then C ⃗ is ……… vector of A ⃗and B ⃗.
3. The magnitude of the resultant force of a 12 N pointing east and a force of 5 N pointing
   south is ……….. N.
4. A vector of magnitude 100 units is inclined at angle 45° to the X-axis. The magnitude of
   X-component is ……… .