Question

An elephant’s heart puts out an average power of 2.5 W but like a human heart, it is only 10% efficient. How many Calories does the elephant need to ingest daily just to keep its heart pumping? (4190 J = 1 Cal).

Answer 1

start with daily **energy** output [at 10% efficiency]:

\(2.5 W \times 24 \times 60 \times 60 = ???? \; J\)

Answer 2

oh i see! thanks alot :D

Answer 3

would u use the 10% in the calculations what so ever?

Answer 4

well, those numbers are only 10% of what it is really producing.

so you need to do the sums and then gross up.

Answer 5

ok thanks :)

Answer 6

ok sorry once u find the joules u convert to calories, but u get such a small value? i think im doing something wrong :/