a$)$

What power motor $(W)$ is needed to run a garden waterfall?

The height between the bottom and the top is $2\mathrm{.}5$ metres, the pump provides a flow rate of $1770$ litres per hour. The water is sent through a smooth $10$ mm diameter pipe whose length is $7$ metres. Ignore all pressure losses.

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b$)$

If the pump efficiency is $70\%$ what motor power $($ kW $)$ will be required?