Units of measurement in astronomy | Crab Nebula
A Crab is a standard astrophotometrical unit for measurement of the intensity of Astrophysical X-ray sources. One Crab is defined as the intensity of the Crab Nebula at the corresponding X-ray photon energy. The Crab Nebula, and the Crab Pulsar within it, is an intense space X-ray source. It is used as a standard candle in the calibration procedure of X-ray instruments in space. However, because of the Crab Nebula's variable intensity at different X-ray energies, conversion of the Crab to another units depends on the X-ray energy range of interest. In the photon energy range from 2 to 10 keV, 1 Crab equals 2.4 · 10−8 erg cm−2 s−1 = 15 keV cm−2 s−1 = 2.4 · 10−11 W m−2. For energies greater than ~30 keV, the Crab Nebula becomes unsuitable for calibration purposes, as its flux can no longer be characterized by a single coherent model. The unit mCrab, or milliCrab, is sometimes used instead of the Crab. (Wikipedia).
What is the formula for a unit vector from a vector in component form
http://www.freemathvideos.com In this video series I will show you how to find the unit vector when given a vector in component form and as a linear combination. A unit vector is simply a vector with the same direction but with a magnitude of 1 and an initial point at the origin. It is i
From playlist Vectors
Learn How to Determine the Unit Vector with the Same Direction as Another Vector
Learn how to determine the unit vector of a vector in the same direction. The unit vector is a vector that has a magnitude of 1. The unit vector is obtained by dividing the given vector by its magnitude. #trigonometry#vectors #vectors
From playlist Vectors
What is the formula for the unit vector
http://www.freemathvideos.com In this video series I will show you how to find the unit vector when given a vector in component form and as a linear combination. A unit vector is simply a vector with the same direction but with a magnitude of 1 and an initial point at the origin. It is i
From playlist Vectors
This video explains how to determine a unit vector given a vector. It also explains how to determine the component form of a vector in standard position that intersects the unit circle. http://mathispower4u.yolasite.com/
From playlist Vectors
What is a linear combination of your unit vectors
http://www.freemathvideos.com In this video series I will show you how to find the unit vector when given a vector in component form and as a linear combination. A unit vector is simply a vector with the same direction but with a magnitude of 1 and an initial point at the origin. It is i
From playlist Vectors - Understanding
Finding the Unit Vector of a Vector in Standard Form
Learn how to determine the unit vector of a vector in the same direction. The unit vector is a vector that has a magnitude of 1. The unit vector is obtained by dividing the given vector by its magnitude. #trigonometry#vectors #vectors
From playlist Vectors
More Standard Deviation and Variance
Further explanations and examples of standard deviation and variance
From playlist Unit 1: Descriptive Statistics
Learn How to Find the Unit Vector Given a Vector as a Linear Combination
Learn how to determine the unit vector of a vector in the same direction. The unit vector is a vector that has a magnitude of 1. The unit vector is obtained by dividing the given vector by its magnitude. #trigonometry#vectors #vectors
From playlist Vectors
Introduction of the Java programming language. Part of a larger series on learning to program. Visit proglit.com
From playlist Java (unit 1)
[Rust] Advent of Code 2021 - Day 7
This is an archive copy of day 7 of Advent of Code 2021. Advent of Code (https://adventofcode.com/) is an Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like. -- Watch live at https://www.twitch
From playlist Advent of Code 2021
Horseshoe Crabs Mate in Massive Beach "Orgy" | National Geographic
Horseshoe crabs have been on Earth an estimated 450 million years, pre-dating the dinosaurs by some 200 million years. They are one of the few living creatures with blue blood, which is used by the pharmaceutical industry for testing drugs. Horseshoe crabs live in the ocean year-round, but
From playlist Animals | National Geographic
These Feisty Hermit Crabs Brawl Over Snail Shells | Deep Look
Hermit crabs are *obsessed* with snail shells. These crafty little crabs, found in California's rocky intertidal zone, are more than happy to let the snails build them a perfect home. When the crabs find a snail shell they like, they hop right into their new abode. SUBSCRIBE to Deep Look!
From playlist Deep Look | Series | KQED
SciShow Quiz Show: Hank vs. Stefan
Associate Producer Stefan Chin faces off against his boss, Hank Green. Will Stefan manage to keep his job? What does a dinosaur sound like? And where is that space whale? ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thank
From playlist Uploads
SciShow Talk Show: More about Animal Weapons with Doug Emlen & Professor Claw the Emperor Scorpion
Doug Emlen returns to SciShow to talk about the parallels between arms races in animals and arms races in humans. Then Jessi joins the show to show off an animal with it's own set of weapons. ---------- Dooblydoo thanks go to the following Patreon supporters -- we couldn't make SciShow wit
From playlist SciShow Talk Show
Once a Spawn a Time: Horseshoe Crabs Mob the Beach | Deep Look
Horseshoe crabs may look scary, but when it's springtime in Delaware Bay, millions of these arthropods show they're lovers, not fighters. They lay masses of blue-green eggs up on the shore. At just the right time, they pop and release the larvae within the sea. WATCH our crab collab epis
From playlist Deep Look | Series | KQED
الميكانيك التقليدي (إم آي تي) 19: دوران الأجسام الصلبة، القصور الذاتي الزاوي، النجوم النيوترونية
MIT المحاضرة التاسعة عشرة من مساق "الميكانيك التقليدي" من جامعة "إم آي تي" للبروفيسور والتر لوين وهي عن: دوران الأجسام الصلبة، القصور الذاتي الزاوي، نظرية المحاور المتوازية والمتعامدة، الطاقة الحركية الدورانية، الحذافات، النجوم النيوترونية، النجوم النابضة بالإضافة للفيديو هناك ملفات مرفقة
From playlist 8.01 Arabic Subtitles
Lec 19: Rotating Rigid Bodies, Inertia, and Axis Theorems | 8.01 Classical Mechanics (Walter Lewin)
Rotating Rigid Bodies, Moments of Inertia, Parallel Axis and Perpendicular Axis Theorem. The moment of inertia for a rigid body around an axis of rotation is introduced, and related to its rotational kinetic energy. Flywheels can be used to store energy. Planets and stars have spin rotatio
From playlist 8.01 Physics I: Classical Mechanics, Fall 1999 (Complete Lectures by Walter Lewin)
6 Invasive Species That Are Actually Saving the Planet
Even though the word "invasive" sounds sketchy, not all non-native species are totally terrible! Here are six invasive species that can actually do more good than harm! Hosted by Stefan Chin. Head to https://scishowfinds.com/ for hand selected artifacts of the universe! ---------- Suppo
From playlist Uploads
How to Find the Unit Vector U in the Same Direction as Vector V
Learn how to determine the unit vector of a vector in the same direction. The unit vector is a vector that has a magnitude of 1. The unit vector is obtained by dividing the given vector by its magnitude. #trigonometry#vectors #vectors
From playlist Vectors