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    • https://phys.libretexts.org/Courses/University_of_California_Davis/UCD%3A_Physics_9D__Modern_Physics/4%3A_Dynamics_in_Special_Relativity/4.2%3A_Energy_Conservation
      Finally we have arrived at perhaps the most famous equation in all of physics – the equation that is on the lips of even the most uninitiated when they hear the name of Einstein. What is remarkable is...Finally we have arrived at perhaps the most famous equation in all of physics – the equation that is on the lips of even the most uninitiated when they hear the name of Einstein. What is remarkable is that as famous as the energy-mass equivalence equation is, precious few know what it really means, which is too bad, because this concept is the pinnacle of special relativity for good reason.
    • https://phys.libretexts.org/Courses/HACC_Central_Pennsylvania's_Community_College/Introduction_to_Physical_Science/03%3A_Work_and_Momentum/3.04%3A_Lecture_4_-_Power
      The lesson is based on section 7.7 in the OpenStax College Physics textbook. The lecture slides are provided in PowerPoint, Keynote, and pdf format.
    • https://phys.libretexts.org/Courses/HACC_Central_Pennsylvania's_Community_College/Introduction_to_Physical_Science/10%3A_Molarity_and_Chemical_Equations/10.01%3A_Lecture_1_-_Formula_Mass_and_the_Mole_Concept
      The lesson is based on section 3.1-3.2 in the OpenStax Chemistry 2e textbook. The lecture slides are provided in PowerPoint, Keynote, and pdf format.
    • https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Stellar_Atmospheres_(Tatum)/01%3A_Definitions_of_and_Relations_between_Quantities_used_in_Radiation_Theory/1.12%3A_Radiance_L
      Since 1979 we have gone one step further, recognizing that obtaining and measuring the radiation from a black body at the temperature of melting platinum is a matter of some practical difficulty, and ...Since 1979 we have gone one step further, recognizing that obtaining and measuring the radiation from a black body at the temperature of melting platinum is a matter of some practical difficulty, and the current definition of the candela makes no mention of platinum or of a black body, and the candela is defined in such a manner that if a source of monochromatic radiation of frequency 5.4×1014Hz has a radiant intensity of 1/683 W sr1 in that direction, the…
    • https://phys.libretexts.org/Courses/University_of_California_Davis/UCD%3A_Physics_9D__Modern_Physics/2%3A_Light_Isn't_Just_a_Wave
      We look at how relativity changes everything we thought we knew about the kinematic effects of relative motion.
    • https://phys.libretexts.org/Bookshelves/Classical_Mechanics/Variational_Principles_in_Classical_Mechanics_(Cline)/04%3A_Nonlinear_Systems_and_Chaos/4.02%3A_Weak_Nonlinearity
      Most physical oscillators become non-linear with increase in amplitude of the oscillations. Consequences of non-linearity include breakdown of superposition, introduction of additional harmonics, and ...Most physical oscillators become non-linear with increase in amplitude of the oscillations. Consequences of non-linearity include breakdown of superposition, introduction of additional harmonics, and complicated chaotic motion that has great sensitivity to the initial conditions as illustrated in this chapter. Weak non-linearity is interesting since perturbation theory can be used to solve the non-linear equations of motion.
    • https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_1e_(OpenStax)/25%3A_The_Milky_Way_Galaxy/25.01%3A_The_Architecture_of_the_Galaxy
      The Milky Way Galaxy consists of a thin disk containing dust, gas, and young and old stars; a spherical halo containing populations of very old stars, and globular star clusters; a thick, more diffuse...The Milky Way Galaxy consists of a thin disk containing dust, gas, and young and old stars; a spherical halo containing populations of very old stars, and globular star clusters; a thick, more diffuse disk with stars that have properties intermediate between those in the thin disk and the halo; a peanut-shaped nuclear bulge of mostly old stars around the center; and a supermassive black hole at the very center. The Sun is located roughly halfway out of the Milky Way.
    • https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Stellar_Atmospheres_(Tatum)/07%3A_Atomic_Spectroscopy/7.26%3A_Stark_Effect
      The Stark effect concerns the separation of the states within a level as the result of the application of an external electric field, and the consequent splitting of lines into Stark components.
    • https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_1e_(OpenStax)/21%3A_The_Birth_of_Stars_and_the_Discovery_of_Planets_outside_the_Solar_System
      Do planets orbit other stars or is ours the only planetary system? In the past few decades, new technology has enabled us to answer that question by revealing nearly 3500 exoplanets in over 2600 plane...Do planets orbit other stars or is ours the only planetary system? In the past few decades, new technology has enabled us to answer that question by revealing nearly 3500 exoplanets in over 2600 planetary systems. Even before planets were detected, astronomers had predicted that planetary systems were likely to be byproducts of the star-formation process. In this chapter, we look at how interstellar matter is transformed into stars and planets.
    • https://phys.libretexts.org/Bookshelves/Waves_and_Acoustics/The_Physics_of_Waves_(Goergi)/07%3A_Longitudinal_Oscillations_and_Sound/7.04%3A_Chapter_Checklist
      A system analogous to that in problem 7.3 is a tube of air with a piston at the top and the bottom open, as shown in Figure 7.9: If the cross sectional area of the tube is A, what is the anal...A system analogous to that in problem 7.3 is a tube of air with a piston at the top and the bottom open, as shown in Figure 7.9: If the cross sectional area of the tube is A, what is the analog in this system of the spring constant, K, in problem 7.3?
    • https://phys.libretexts.org/Courses/University_of_California_Davis/UCD%3A_Classical_Mechanics/7%3A_Gravitation/7.1%3A_Universal_Gravitation
      We now dig a little deeper into a fundamental force for which we have up to now only used a simplified model for motion near the surface of the earth.

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