garoos have very stout tendons in their legs that can be used to store energy. When a kangaroo lands on its feet, the tendons stretch, transforming kinetic energy of motion to elastic potential energy. Much of this energy can be transformed back into kinetic energy as the kangaroo takes another hop. The kangaroo’s peculiar hopping gait is not very efficient at low speeds but is quite efficient at high speeds. as shown the energy cost of human and kangaroo locomotion. The graph shows oxygen uptake (in mL/s) per kg of body mass, allowing a direct comparison between the two species. For humans, the energy used per second (i.e., power) is proportional to the speed. That is, the human curve nearly passes through the origin, so running twice as fast takes approximately twice as much power. For a hopping kangaroo, the graph of energy use has only a very small slope. In other words, the energy used per second changes very little with speed. Going faster requires very little additional power. Treadmill tests on kangaroos and observations in the wild have shown that they do not become winded at any speed at which they are able to hop. No matter how fast they hop, the necessary power is approximately the same. A person runs 1 km. How does his speed affect the total energy needed to cover this distance? A. A faster speed requires less total energy. B. A faster speed requires more total energy. C. The total energy is about the same for a fast speed and a slow speed

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter1: Introduction And Vectors
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garoos have very stout tendons in their legs that can be used to store energy. When a kangaroo lands on its feet, the tendons stretch,
transforming kinetic energy of motion to elastic potential energy. Much of this energy can be transformed back into kinetic energy as the kangaroo takes another hop. The kangaroo’s peculiar hopping gait is not very efficient at low speeds but is quite efficient at high speeds. as shown the energy cost of human and kangaroo locomotion. The graph shows oxygen uptake (in mL/s) per kg of body mass, allowing a direct comparison between the two species. For humans, the energy used per second (i.e., power) is proportional to the speed. That is, the human curve nearly passes through the origin, so running twice as fast takes approximately twice as
much power. For a hopping kangaroo, the graph of energy use has only a very small slope. In other words, the energy used per second changes very little with speed. Going faster requires very little additional power. Treadmill tests on kangaroos and observations in the wild have shown that they do not become winded at any speed at which they are able to hop. No matter how fast they hop, the necessary power is approximately the same.

A person runs 1 km. How does his speed affect the total
energy needed to cover this distance?
A. A faster speed requires less total energy.
B. A faster speed requires more total energy.
C. The total energy is about the same for a fast speed and a slow speed.

Oxygen uptake
(ml/kg - s)
2.04
1.8-
1.6-
1.4-
1.2-
1.0-
0.8-
0.6-
0.4-
0.2-
Human, running
Red kangaroo,
hopping
10
Speed (m/s)
4
6.
12
420
Transcribed Image Text:Oxygen uptake (ml/kg - s) 2.04 1.8- 1.6- 1.4- 1.2- 1.0- 0.8- 0.6- 0.4- 0.2- Human, running Red kangaroo, hopping 10 Speed (m/s) 4 6. 12 420
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