Table of contents

0. Math Review31m
- Math Review
  31m
1. Intro to Physics Units1h 29m
2. 1D Motion / Kinematics3h 56m
3. Vectors2h 43m
4. 2D Kinematics1h 42m
5. Projectile Motion3h 6m
6. Intro to Forces (Dynamics)3h 22m
7. Friction, Inclines, Systems2h 44m
8. Centripetal Forces & Gravitation7h 26m
9. Work & Energy1h 59m
10. Conservation of Energy2h 54m
11. Momentum & Impulse3h 40m
12. Rotational Kinematics2h 59m
13. Rotational Inertia & Energy7h 4m
14. Torque & Rotational Dynamics2h 5m
15. Rotational Equilibrium3h 39m
16. Angular Momentum3h 6m
17. Periodic Motion2h 9m
18. Waves & Sound3h 40m
19. Fluid Mechanics4h 27m
20. Heat and Temperature3h 7m
21. Kinetic Theory of Ideal Gases1h 50m
22. The First Law of Thermodynamics1h 26m
23. The Second Law of Thermodynamics3h 11m
24. Electric Force & Field; Gauss' Law3h 42m
25. Electric Potential1h 51m
26. Capacitors & Dielectrics2h 2m
27. Resistors & DC Circuits3h 8m
28. Magnetic Fields and Forces2h 23m
29. Sources of Magnetic Field2h 30m
30. Induction and Inductance3h 38m
31. Alternating Current2h 37m
32. Electromagnetic Waves2h 14m
33. Geometric Optics2h 57m
34. Wave Optics1h 15m
35. Special Relativity2h 10m

9. Work & Energy

Intro to Energy & Kinetic Energy

Physics

9. Work & Energy

Intro to Energy & Kinetic Energy

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Multiple Choice

In the context of energy transfer in ecosystems, what does the '10% rule' refer to, and why is energy lost at each trophic level?

The 10% rule indicates that 10% of energy is converted into biomass, with energy lost due to gravitational forces.

The 10% rule states that only 10% of energy is transferred to the next trophic level, with energy lost primarily as heat.

The 10% rule implies that 10% of energy is used for reproduction, with energy lost due to friction.

The 10% rule suggests that 10% of energy is stored in chemical bonds, with energy lost through nuclear reactions.

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Verified step by step guidance

Understand the concept of the '10% rule' in ecology: It refers to the observation that, on average, only about 10% of the energy at one trophic level is transferred to the next level in an ecosystem.

Recognize that energy is lost at each trophic level primarily as heat due to metabolic processes. Organisms use energy for growth, reproduction, and maintenance, and much of this energy is dissipated as heat.

Clarify that the energy transfer is not due to gravitational forces or friction, as these are not significant factors in energy loss in biological systems.

Note that the energy is not lost through nuclear reactions in biological contexts. Instead, it is the inefficiency of energy transfer in biological processes that leads to energy loss.

Conclude that the 10% rule highlights the inefficiency of energy transfer in ecosystems, emphasizing the importance of energy conservation and the role of producers in capturing solar energy.