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

Which of the following is considered an efficient storage of energy?

Incandescent light bulbs

Coal-fired power plants

Lithium-ion batteries

Lead-acid batteries

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Verified step by step guidance

Understand the concept of energy storage: Energy storage refers to capturing energy produced at one time for use at a later time. Efficient energy storage systems are those that can store a large amount of energy relative to their size and weight, and can release it quickly when needed.

Identify the types of energy storage mentioned: The options given are incandescent light bulbs, coal-fired power plants, lithium-ion batteries, and lead-acid batteries. Among these, only lithium-ion batteries and lead-acid batteries are actual energy storage devices.

Compare the efficiency of lithium-ion batteries and lead-acid batteries: Lithium-ion batteries are known for their high energy density, meaning they can store a large amount of energy in a small space. They also have a high charge/discharge efficiency and a long cycle life. Lead-acid batteries, while cheaper, have lower energy density and shorter cycle life.

Consider the application and advantages of lithium-ion batteries: Lithium-ion batteries are widely used in portable electronics, electric vehicles, and renewable energy systems due to their efficiency, lightweight, and ability to hold charge for extended periods.

Conclude why lithium-ion batteries are considered efficient: Based on their high energy density, long cycle life, and efficiency in storing and releasing energy, lithium-ion batteries are considered an efficient storage of energy compared to the other options listed.