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MTH103 9/10

1. If m→=3i+4j+5k and n→=2i+j+7k then the evaluation of m→∙n→ is ______.

45

2. If a→=3i+5j and b→=7i+3j then the evaluation is ________________

10i+8j

3. The scalar product of a→∙b→ is called ____ product.

Dot

4. Find AB→+BC→+CD→+DE→+EF→

AF→

5. Which of the following is NOT a vector quantity?

Mass

6. The scalar product of two vectors at right angles to each other is equals to ____.

0

7. If a = a force of 30N, acting in the east direction and b = a force of 40N, acting in the north direction. Then, the magnitude of the vector sum of these vectors is

50N

8. Given that PQ→=-i+2j-2k, the magnitude of PQ→ is ______________

3

9. If a→=i+j-2k then the direction cosines are______.

-16,16,-26

10. ________ is the angle between the vector and the three coordinate axes.

Direction cosines