A 0.080Kg robin, perched on a power line 6 m above the ground, swoops down to snatch a worm from the ground and then returns to an 8 m high tree beach with his catch. By how much did the birds PE increase in his trip from the power line to the branch?

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Physics

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1 August, 00:56

A 0.080Kg robin, perched on a power line 6 m above the ground, swoops down to snatch a worm from the ground and then returns to an 8 m high tree beach with his catch. By how much did the birds PE increase in his trip from the power line to the branch?

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Charity Butler · Answer 1

If the initial PE is mgh (initial) and the final PE is mgh (final) then mgh (initial) - mgh (final) should give you your change in PE.

So, without conversions your answer should be

[ (.08) (9.8) (8) ]-[ (.08) (9.8) (6) ]=change in PE which is 1.568Joules.