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Question: for mammals heartbeat frequency number of heartbeats per minute fh...

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For mammals, heartbeat frequency (number of heartbeats per minute, fh) scales with body mass (Mbody) raised to the power of -0.25: fh∝M−0.25body.

The blue whale ( Balaenoptera musculus) is the largest mammal and it has a mass of 136,000 kg. The smallest mammal is Kitti's hog-nosed bat (Craseonycteris thonglongyai) with a mass of only 2 g. Assuming both animals obey the above scaling relationship, what is the ratio of the heartbeat frequencies of Kitti's hog-nosed bat to the blue whale? Report your answer uisng two significant figures.

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