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Sahay Sir > Question Answers > NCERT Exemplar Class 11 > Physics > Chapter 5 - Work, Energy and Power > On complete combustion, a liter of petrol gives off heat equivalent to 3×10^7 J. In a test drive a car weighing 1200 kg including the mass of driver, runs 15 km per liter while moving with uniform speed on a straight track. Assuming that friction offered by the road surface and air to be uniform. calculate the force of friction acting on the car during the drive, if the efficiency of the car engine were =0.5.

On complete combustion, a liter of petrol gives off heat equivalent to 3×10^7 J. In a test drive a car weighing 1200 kg including the mass of driver, runs 15 km per liter while moving with uniform speed on a straight track. Assuming that friction offered by the road surface and air to be uniform. calculate the force of friction acting on the car during the drive, if the efficiency of the car engine were =0.5.

a liter of petrol gives off heat equivalent to 3×10^7 J. In a test drive a car weighing 1200 kg including the mass of driver On complete combustion one gradual and the other steep meet at A from where two stones are allowed to slide down from rest one on each tracks as shown in figure. Which of the following statements is correct? Two inclined frictionless tracks