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A 12 HP motor has to be operated 8 hours/day. How much will it cost at the rate of 25 paisa/kWh in 20 days

  • Option 1)

    Rs. 350

  • Option 2)

    Rs. 358

  • Option 3)

    Rs. 375

  • Option 4)

    Rs. 397

 

Answers (1)

best_answer

As we discussed in concept

Kinetic energy -

k= \frac{p^{2}}{2m}

- wherein

p\rightarrow momentum

m\rightarrow mass

kinetic Energy is frame dependent

 

12hp=12\times746\: watt=8952 \:watt =8.952\:kw

P=\frac{W}{t}=\frac{E}{P}

=>E=P\times t

E= Power time in hours/1000

E=\frac{8952\times 8}{1000}=71.616\: unit \: or\:71.616\: Kw

It is used for 10 days

Energy Consumed 71.616\times 10=716.16 \:unit

\\Cost\: of\: 1 unit = 50ps \: \\ so \:Cost\: of \: 716.16\: unit =Rs\: 358.08

 


Option 1)

Rs. 350

Option is incorrect

Option 2)

Rs. 358

Option is correct

Option 3)

Rs. 375

Option is incorrect

Option 4)

Rs. 397

Option is incorrect

Posted by

prateek

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