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A lit of mass M=0.8 ton is raised to a h...

A lit of mass M=0.8 ton is raised to a height h=40m in t=0.5min. The voltage across the motar terminals is V=220V and the motar efficiency `eta=90%`. Find the power an current consumed by the motar and the price of one hoisting if B.O.T. costs 60 paise.

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The correct Answer is:
11.6KW, 52.7A, 6paise
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NN GHOSH-HEATING AND CHEMICAL EFFECT OF CURRENT-EXAMPLE B
  1. A lit of mass M=0.8 ton is raised to a height h=40m in t=0.5min. The v...

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  2. A 2 m long wire of resistance 4 Omega and diameter 0.64 mm is coated w...

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  3. A fuse made of lead wire has an area for cross-section 0.2mm^(2). On s...

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  4. An electric kettle has two windings. When one of the n is switched on ...

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  5. A shortage battey with an emf of 10V and an internal resistance 1Omega...

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  6. A copper voltameter is connecterd in series with a battey and a 1Omega...

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  7. A metal plate with a total surface are of 300cm^(2) is to be benickel ...

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  8. A copper voltameter is connected in series with a tangent galvanometer...

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  9. In copper voltameter 20mg of copper is deposited on the cathode of th...

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  10. A steady current is passed for 25minutes through a silver voltameter a...

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  11. A current of 5A is passed fir 5hours through three voltameters arrange...

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  12. A current passes throgugh a copper voltameter and water voltameter I s...

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  13. When a detonating gas explodes, 34.5kcal ar liberted per gram of hydro...

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  14. A cell develops the same power across two resistances R(1) and R(2) se...

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  15. A series battery by 6 lead accumulators each of emf 2.0V and intenal r...

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  16. A dynamo of emf varepsilon(1)=120V and internal resistance r=0.5Omega,...

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  17. A Capacitor of capacitance C=5muF is connected to source of emf vareps...

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  18. In the cirucit (figure6.3) resistance R(1) and R(2) are known and cell...

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  19. A capacitor of capacitance C is charged to a voltage V(0) and subseque...

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  20. Show the Joule's law can be expressed as Q=rhol^(2) or sigmaE^(2) wher...

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  21. A coil of radius r=25cm is made of a thin copper wire of length l=500m...

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