Instruction for Question number 5 to 8: This part has four questions carrying 10

Question

Instruction for Question number 5 to 8: This part has four questions carrying 10 points in each. You can use the backside of your paper calculations. Once your arrive at the answer then make the choice out of four alternatives given. Indiacat your choice by given a cross mark against choice. your choice. There is no negative marking for wrong answer. Find the magnitude of the resultant of A =2i+5j, B = 6i- 7k , and C=2i-6j+10k 8.2 10.5 9.3 11.7 Find the magnitude of the reaction at support B for yje beam shown below. 400 600 500 700

Explanation / Answer

5) Resultant = A+B+C = (2i + 5j) + ( 6i - 7k ) + (2i - 6j + 10k ) = 10i - j + 3k

magnitude = sqrt ( 102+(- 1)2 + 32) = 10.5

6) taking Moment at A

B*8 = 400 * 4 +100*4 *(4+2)

B = 500 N

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