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Given vecF=(4hati-10hatj)and vecr=(5hati...

Given `vecF=(4hati-10hatj)and vecr=(5hati-3hatj)`. then torque `vectau` is

A

`-62 hatj`

B

`62 hatk`

C

`38 hati`

D

`-38 hatk`

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The correct Answer is:
D
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NCERT FINGERTIPS-PRACTICE PAPERS-Practice Paper 3
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  2. Which of the following is dimensionless?

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  3. Given vecF=(4hati-10hatj)and vecr=(5hati-3hatj). then torque vectau is

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  4. A man throws balls with the same speed vertically upwards one after th...

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  5. In uniform circular motion

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  6. A ball is rolled off along the edge of the table (horizontal ) with ve...

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  7. Three masses of 1kg, 6 kg and 3 kg are connected to each other with th...

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  8. A liquid of density rho flows along a horizontal pipe of uniform cross...

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  9. A chain of uniform mass m and length L is held on a frictionless table...

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  10. For the same total mass, which of the following will have the largest ...

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  11. Kepler's second law is based on

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  12. A spaceship is launched into a circular orbit close to the Earth's sur...

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  13. A hole is drilled in a copper sheet. The diameter of the hole is 4.24 ...

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  14. Two blocks M1 and M2 having equal masses are to move on a horizontal f...

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  15. A block of mass m=2kg is resting on a rough inclined plane of inclinat...

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  16. The density of a solid ball is to be determined in an experiment. The ...

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  17. A floor-mat of mass M made up of extensible material, is rolled along ...

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  18. A liquid of density rho0 is filled in a wide tank to a height h. A sol...

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  19. A cyclic process ABCA is shown in the V-T diagram process on the P-V

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  20. Two pendulums differ in lengths by 22m. They oscillate at the same pla...

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