Đáp án:
\(\begin{array}{l}
1.\\
a.\\
P = \frac{A}{t}\\
\Rightarrow A = Pt = 100.1,25 = 125kWh\\
b.\\
F = 10000N\\
2.\\
P = 600W\\
3.\\
F = 137,5N\\
4.\\
P = 1000W
\end{array}\)
Giải thích các bước giải:
\(\begin{array}{l}
1.\\
a.\\
P = \frac{A}{t}\\
\Rightarrow A = Pt = 100.1,25 = 125kWh\\
b.\\
36km/h = 10m/s\\
P = Fv\\
\Rightarrow F = \frac{P}{v} = \frac{{100000}}{{10}} = 10000N\\
2.\\
10,8km/h = 3m/s\\
P = Fv = 200.3 = 600W\\
3.\\
14,4km/h = 4m/s\\
P = Fv\\
F = \frac{P}{v} = \frac{{550}}{4} = 137,5N\\
4.\\
7,2km/h = 2m/s\\
P = Fv = 500.2 = 1000W
\end{array}\)