Math, asked by sriharibt, 1 year ago

A Force of F=[2icap+4jcap]N displaces a body by B=[3jcap+5kcap]m in 2s.Power generated is?

Answers

Answered by vikaskumar0507

P = dw/dt
dw = F dot ds
dw = (2i +4j) dot (3j +5k)
= 12 J
P = 12/2
P = 6 W

sriharibt: Can Mr.Vikaskumar please explain me the 3rd Step??

vikaskumar0507: what are you not understand in this step?

sriharibt: how is dot roduct obtained?

sriharibt: Sorry the above statement should have been" How is dot product obtained"??

vikaskumar0507: dot product obtained ; multiply magnitude of two vector and cos(theta) where theta = angle between two vector for above Example 2*3*cos90 = 6*0 = 0 (angle between i and j vector is 90). i hope you will understand if any doubt please ask me.

sriharibt: Thank You Mr.Vikaskumar!!

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