# Friction coefficient

What is the weight of a car when it moves on a horizontal road at a speed of v = 50 km/h at engine power P = 7 kW? The friction coefficient is 0.07

Correct result:

m =  720 kg

#### Solution:

$v=50 \ km/h \rightarrow m/s=50 / 3.6 \ m/s=13.88889 \ m/s \ \\ P=7000 \ \text{W} \ \\ t=0.07 \ \\ g=10 \ \text{m/s}^2 \ \\ \ \\ P=Fv \ \\ \ \\ F=P/v=7000/13.8889=504 \ \text{N} \ \\ \ \\ F=t m g \ \\ \ \\ m=F/(t \cdot \ g)=504/(0.07 \cdot \ 10)=720 \ \text{kg}$ Our examples were largely sent or created by pupils and students themselves. Therefore, we would be pleased if you could send us any errors you found, spelling mistakes, or rephasing the example. Thank you!

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