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Nataliya [291]
3 years ago
13

3. A child decides to keep his goldfish outside in a small bowl. He has to add water every day to keep

Physics
1 answer:
weeeeeb [17]3 years ago
5 0
Humidity is 90 it will be hotter so the child has to add water to the goldfish bowl
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3 years ago
26. A 40 kg boy jumps from a height of 4m onto a plate-form mounted on springs. As the
denpristay [2]

Answer:

c. 1600J

Explanation:

The loss in potential energy of the boy is given by:

U=mg \Delta h

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m = 40 kg is the mass of the boy

g = 9.8 m/s^2 is the acceleration of gravity

\Delta h = 4 m + 0.02 m = 4.02 m is the total change in the height of the boy (4 metres + 2 cm due to the compression of the spring)

Substituting, we find

\Delta U = (40 kg)(9.8 m/s^2)(4.02 m) = 1577 J \sim 1600 J

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