we know that
the surface area of the top of the water
is calculated with the formula of the area of a circle

Step 1
Find the radius of the water tank in the middle of the tank
by proportion

so
For h=5 m
the radius is equal to r=1.5 m
Step 2
Find the surface area


therefore
the answer is
the surface area of the top of the water is 
Answer: You can lift A dumbell one time.
Explanation: Doing this for one or 2 reps can demonstrate musular strength. any more than that is usually endurance. You can do deadlift or any heavy wights to show muscular strength
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