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A motor boat is going in a river with a ...

A motor boat is going in a river with a velocity `vec(V) = (4 hat i-2 hat j + hat k) ms^(-1)`. If the resisting force due to stream is `vec (F)=(5 hat i-10 hat j+6 hat k)N`, then the power of the motor boat is

A

100 W

B

50 W

C

46 W

D

23 W

Text Solution

Verified by Experts

The correct Answer is:
`(3)`
`P = vec F. vecV`
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NARAYNA-WORK , ENERGY & POWER -EXERCISE -1 (H.W)
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  2. A particle moves with the velocity vec v = (5 vec i + 2 vec j - vec k)...

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  3. A motor boat is going in a river with a velocity vec(V) = (4 hat i-2 h...

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  4. Two riffles fire the same number of bullets in a givem interval of tim...

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  5. A car weighing 1000 kg is going up an incline with a slope of 2 in 25 ...

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  6. A crane can lift up 10,000 kg of coal in 1 hour form a mine of 180 m d...

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  7. A man carries a load of 50 kg through a height of 40 m in 25 seconds. ...

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  8. An electric motor creates a tension of 4500 newton in a hoisting cable...

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  9. A juggler throws continuously balls at the rate of three in each secon...

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  10. A bucket tied at the end of a 1.6m long string is whirled in a verticl...

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  11. A body of mass 2 kg attached at one end of light string rotated along ...

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  12. A pilot of mass m can bear a maximum apparent weight 7 times of mg. Th...

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  13. The length of ballistic pendulum is 1 m and mass of its block is 0.98 ...

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  14. A simple pendulum is oscillating with an angular amplitude 60^@. If ma...

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  15. A body is moving in a vertical circle such that the velocities of body...

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  16. A ball of mass 0.6 kg attached to a light inextensible string rotates ...

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  17. Two particles of same mass m moving with velocities u(1) and u(2) coll...

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  18. A ball impinges directly on a similar ball at rest. If 1/4 ^(th) of th...

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  19. n bullets per sec each of mass m moving with velocity v strike normall...

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  20. A heavy nucleus at rest breaks into two fragments which fly off with v...

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