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)

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

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