# Misc

45107 posts

## Easy Fast way to Find Null space, Hyper Plane, Solution to Ax=0, Orthogonal Matrix B such that AB=0.

This video covers a quick way to extract the null space or kernel of a matrix. Get all my eBooks free when you subscribe to https://jjthetutor.com The objective to solve this is assuming you can perform reduced row echelon form already. If you do not know how to perform RREF, watch this video: https://jjthetutor.com/echelon-forms-ef-ref-rref-the-difference-between-echelon-reduced-echelon-reduced-row-echelon/ Once…

## Increase your final exam score by 25% without doing any studying! 3 simple techniques

Make donations: https://paypal.me/jjthetutor or Venmo JJtheTutor Increase your final exam score by 25% without doing any studying! 3 simple techniques. 1) Put down all formulae, theorems, and or definitions down prior to answer any questions for each questions. This will generally guarantee 50% credit (depending on the professor.) 2) Do the easy problems first but…

## Use n=4 rectangles and left hand endpoints to estimate 1/(1+x^2). Is this an over-estimate?

Make donations: https://paypal.me/jjthetutor or Venmo JJtheTutor Use n=4 rectangles and left hand endpoints to estimate 1/(1+x^2). Is this an over-estimate or an under-estimate?

## Let {u1,u2,u3} be an orthonormal basis for an inner product sace V and let u = u1 + 2u2 + 2u3 and v

NOTE: Some of my videos are just screenshots of one-on-one lessons. Hey everyone! It is a lot of work to make these videos, and I do it for free. I hope you all can make a small donation to show your appreciation! Thanks! Venmo @JJtheTutor, http://paypal.me/jjthetutor

## Evaluate the line integral F * dr, where C is given by the vector function rt Fx,y,z = xi+yj+xyk rt

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## Evaluate the line integral, where C is the given curve sinx dx + cosy dy, where C consists of the t

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## Use corollary 5 5 3 to evaluate f,g = 1:pi integral fxgx d C pi,pi fx = 3cosx + 2sinx and gx = cosx

NOTE: Some of my videos are just screenshots of one-on-one lessons. Hey everyone! It is a lot of work to make these videos, and I do it for free. I hope you all can make a small donation to show your appreciation! Thanks! Venmo @JJtheTutor, http://paypal.me/jjthetutor

## Determine whether or not F is a conservative vector field If it is, find a function f such that F =

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## evaluate the line integral F * dr Fx,y,z = sinx i + cosy j + xz k rt = t^3 o t^4 j + tk

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## A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diame

NOTE: Some of my videos are just screenshots of one-on-one lessons. Hey everyone! It is a lot of work to make these videos, and I do it for free. I hope you all can make a small donation to show your appreciation! Thanks! Venmo @JJtheTutor, http://paypal.me/jjthetutor

## Evaluate the line integral F dot dr where C is given by the vector function rt sinx i +cosy j +xz k

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## Let x = 1,1,1,1^T and y = 8,2,2,0^T a Determine the angle theta between x any y, find projection of

NOTE: Some of my videos are just screenshots of one-on-one lessons. Hey everyone! It is a lot of work to make these videos, and I do it for free. I hope you all can make a small donation to show your appreciation! Thanks! Venmo @JJtheTutor, http://paypal.me/jjthetutor

## Isolated-Focus-Study with Strategic-Testing for maximum credit on exams TM JJtheTutor

Make donations: https://paypal.me/jjthetutor on Venmo JJtheTutor (1) Strategically choose a block of problems say 20 for a 5 questions test that will be on the exam, and master those questions. (2) Give yourself 4 exams (5 questions each) prior to exam (3) grade them combined strategic-testing (1) sit in front and ask questions (2) visit…

## Part I – Easy way to find eigenvalues – No fuss

Subscribe for More Lessons: https://YouTube.com/WeSolveThem Tip for Good Service: https://PayPal.me/WeSolveThem Thousands of free solutions: https://WeSolveThem.com Full lesson available via https://wp.me/p7kK3u-3GB This is a straight forward no drama way to find the eigenvectors of any matrix, given you understand how to take the determinant of a matrix and do basic algebra.

## Index/Tensor Notation – Dot Product Summation Proof (Multiple Rule)

Subscribe for More Lessons: https://YouTube.com/WeSolveThem Tip for Good Service: https://PayPal.me/WeSolveThem Thousands of free solutions: https://WeSolveThem.com In this video, we begin breaking down the foundations of proofs for our index and or tensor notation operations. The summation of inner products is very important.

## Show that the following statement is an identity by transforming the left side into the right side.

Leave a tip for good service: https://paypal.me/jjthetutor Student Solution Manuals: https://amzn.to/2WZrFnD More help via http://jjthetutor.com Download my eBooks via http://payhip.com/jjthetutor, paperback via http://amazon.com/author/jjthetutor.

## A 6.0-kg box moving at 3.0 m/s on a horizontal, frictionless surface runs into a light spring

Leave a tip for good service: https://paypal.me/jjthetutor A 6.0-kg box moving at 3.0 m/s on a horizontal, frictionless surface runs into a light spring of force constant 75 N/cm. Use the work–energy theorem to find the maximum compression of the spring. Student Solution Manuals: https://amzn.to/2WZrFnD More help via http://jjthetutor.com Download my eBooks via http://payhip.com/jjthetutor, paperback…

## Suppose each edge of the cube shown in the figure is 3 inches long

Leave a tip for good service: https://paypal.me/jjthetutor Student Solution Manuals: https://amzn.to/2WZrFnD More help via http://jjthetutor.com Download my eBooks via http://payhip.com/jjthetutor, paperback via http://amazon.com/author/jjthetutor.

## Ice accelerating down an incline | Forces and Newton’s laws of motion | Physics | Khan Academy

Figuring out the acceleration of ice down a plane made of ice. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/physics/forces-newtons-laws/inclined-planes-friction/v/force-of-friction-keeping-the-block-stationary?utm_source=YT&utm_medium=Desc&utm_campaign=physics Missed the previous lesson? https://www.khanacademy.org/science/physics/forces-newtons-laws/inclined-planes-friction/v/inclined-plane-force-components?utm_source=YT&utm_medium=Desc&utm_campaign=physics Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We’ll start by looking at motion itself. Then, we’ll learn…

## Proof: The derivative of __ is __ | Advanced derivatives | AP Calculus AB | Khan Academy

Proving that the derivative of __ is __ using the definition of the derivative as a limit, and the definition of _ as a limit. Watch the next lesson: https://www.khanacademy.org/math/ap-calculus-ab/ab-derivatives-advanced/ab-adv-derivatives-opt-vids/v/proof-of-derivative-of-ln-x?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB Missed the previous lesson? https://www.khanacademy.org/math/ap-calculus-ab/ab-derivatives-advanced/ab-diff-log/v/derivative-log-properties?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB AP Calculus AB on Khan Academy: Bill Scott uses Khan Academy to teach AP Calculus at Phillips Academy in Andover,…

## Converting decimals to fractions example 1 | Decimals | Pre-Algebra | Khan Academy

We’re practicing how to convert a lonely decimal into a happy fraction. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/decimal-to-fraction-pre-alg/e/converting_decimals_to_fractions_1?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra Watch the next lesson: https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/decimal-to-fraction-pre-alg/v/converting-decimals-to-fractions-1-ex-2?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra Missed the previous lesson? https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/decimal-to-fraction-pre-alg/v/decimals-and-fractions?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra Pre-Algebra on Khan Academy: No way, this isn’t your run of the mill arithmetic. This is Pre-algebra. You’re about to play with the professionals.…

## Limit examples (part 3) | Limits | Differential Calculus | Khan Academy

More limit examples Watch the next lesson: https://www.khanacademy.org/math/differential-calculus/limits_topic/old-limits-tutorial/v/limit-examples-w-brain-malfunction-on-first-prob-part-4?utm_source=YT&utm_medium=Desc&utm_campaign=DifferentialCalculus Missed the previous lesson? https://www.khanacademy.org/math/differential-calculus/limits_topic/old-limits-tutorial/v/limit-examples-part-2?utm_source=YT&utm_medium=Desc&utm_campaign=DifferentialCalculus Differential calculus on Khan Academy: Limit introduction, squeeze theorem, and epsilon-delta definition of limits. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of…

## Linear approximation of a rational function | Derivative rules | AP Calculus AB | Khan Academy

Sal finds a linear expression that approximates y=1/(x-1) around x=-1. This is done by finding the equation of the line tangent to the graph at x=-1, a process called “linear approximation.”. Watch the next lesson: https://www.khanacademy.org/math/ap-calculus-ab/ab-derivative-rules/ab-chain-rule/v/chain-rule-introduction?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB Missed the previous lesson? https://www.khanacademy.org/math/ap-calculus-ab/ab-derivative-rules/ab-rational-func-diff/v/rational-functions-differentiation?utm_source=YT&utm_medium=Desc&utm_campaign=APCalculusAB AP Calculus AB on Khan Academy: Bill Scott uses Khan Academy to teach AP…

## 1940 – Axis gains momentum in World War II | The 20th century | World history | Khan Academy

In this second video giving an overview of World War II, we see Germany and the Axis powers only continue to gain momentum in 1940. Watch the next lesson: https://www.khanacademy.org/humanities/world-history/euro-hist/wo/v/1941-axis-momentum-accelerates-in-ww2?utm_source=YT&utm_medium=Desc&utm_campaign=worldhistory Missed the previous lesson? https://www.khanacademy.org/humanities/world-history/euro-hist/wo/v/beginning-of-world-war-ii?utm_source=YT&utm_medium=Desc&utm_campaign=worldhistory World history on Khan Academy: From the earliest civilizations to the modern world, geography, religion, trade, and politics have bound…

## Magnetic force between two currents going in the same direction | Khan Academy

Sal shows how to determine the magnetic force between two currents going in the same direction. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/physics/magnetic-forces-and-magnetic-fields/magnetic-field-current-carrying-wire/v/magnetism-8?utm_source=YT&utm_medium=Desc&utm_campaign=physics Missed the previous lesson? https://www.khanacademy.org/science/physics/magnetic-forces-and-magnetic-fields/magnetic-field-current-carrying-wire/v/magnetism-6-magnetic-field-due-to-current?utm_source=YT&utm_medium=Desc&utm_campaign=physics Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We’ll start by looking at motion…

## Compound-complex sentences | Syntax | Khan Academy

Compound-complex sentences are compound sentences with dependent or subordinate clauses added to them. Paige and Rosie explain how to spot and use them. Practice this yourself on Khan Academy right now www.khanacademy.org/syntax/e/complex-and-compound-complex-sentences/ Watch the next lesson: https://www.khanacademy.org/humanities/grammar/syntax/v/subject-verb-agreement-syntax-khan-academy Missed the previous lesson? watch here: https://www.khanacademy.org/humanities/grammar/syntax/v/complex-sentences-syntax-khan-academy Syntax on Khan Academy: Syntax is the ordering of language; it’s…

## Supernova clarification | Stars, black holes and galaxies | Cosmology & Astronomy | Khan Academy

Supernova clarification. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-life-death-tutorial/v/black-holes?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/stellar-life-topic/stellar-life-death-tutorial/v/supernova-supernovae?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance…