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Pranay Sama
Asked: 2022-11-09T05:37:57+05:30 In:

A particle moves with a velocity `6hat(i)-4hat(j)+3hat(k)m//s` under the influence of a constant force `vec(F)= 20hat(i)+15hat(j)-5hat(k)N`.
The instantaneous power applied to the particle is
A. `35(J)//(s)`
B. `45(J)//(s)`
C. `25(J)//(s)`
D. `195(J)//(s)`

A particle moves with a velocity `6hat(i)-4hat(j)+3hat(k)m//s` under the influence of a constant force `vec(F)= 20hat(i)+15hat(j)-5hat(k)N`.
The instantaneous power applied to the particle is
A. `35(J)//(s)`
B. `45(J)//(s)`
C. `25(J)//(s)`
D. `195(J)//(s)`
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1 Answer

  1. Correct Answer – B
    `P=vecF.vecv=(20hati+15hatj-15hatk).(6hati-4hatj+3hatk)`
    `=120-60-15=45W`

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