Question

A vector 3i+4; rotates about its tail through an angle 90° in anticlockwise direction. Then the new vector is 1) 31-4; 2) ti+3] 4) 5 3) 57​

Answer 1

Answer:

The vector is 3i + 4j so to rotate the vector first we need to find the angle 0 with which it is making with the x axis.

So, taney/x which will be tan0=4/3 = 53 degree.

Thus, the vector is making 53 degree with the x axis hence according to the question if we rotate the vector with 37 degree anticlockwise then the vector will lie entirely in the y axis.

So, the vector will be √(3^2 + 4^2) jcap which will be 5 jcap.

Explanation:

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