# Motorcycle engine

The motorcycle engine has a constant power of 1.2 kW for 0.5 hours. How much work does the engine do? Express work in kWh and Ws units.

Correct result:

W1 =  0.6 kWh
W2 =  2160000 Ws

#### Solution:

$P=1.2 \ \text{kW} \ \\ t=0.5 \ \text{h} \ \\ \ \\ W_{1}=P \cdot \ t=1.2 \cdot \ 0.5=\dfrac{ 3 }{ 5 }=0.6 \ \text{kWh}$
$W_{2}=3600 \cdot \ 1000 \cdot \ W_{1}=3600 \cdot \ 1000 \cdot \ 0.6=2160000 \ \text{Ws}=2.160000\cdot 10^{ 6 } \ \text{Ws}$

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