Table Definition and 894 Threads

The Periodic Table is 150 years old sometime this year (I could not find its exact birthday). Good job Mendeleev! Here is a Science magazine news info graphic on how it has changed over time (before and after Mendeleev). The graphic came out a while ago, but was not working then. Now it does.

Homework Statement (i) Construct the cumulative distribution table for the number of heads when the four coins are tossed. Coins are fair. (ii) Find the Median.Homework EquationsThe Attempt at a Solution (i) x 0 1 2 3...

Hello! The question is attached. I know that " $\implies $ " (implies) has precedence from right to left. But because " l- " appears after P$\implies ($Q $\implies$ R ), in my truth table do I evaluate:(P$\implies ($Q $\implies$ R ) ) $\implies$ ((P$\implies$Q ) $\implies$ R ) ) or...

Homework Statement [/B] Given a group of 100 married couples, let X1 be the number of sons and X2 the number of daughters the couple has. P(X1 = 0, X2 = 2) = f(0, 2) = 8 /100 = 0.08 2. Homework Equations The Attempt at a Solution I tried to look for a similar example online, I found this...

Hi everyone! Brand new here. I'm sorry if this isn't the right place to post this but I am terrible with math/calculating anything so I thought I would reach out and ask! No harm done, hopefully. I'm building an 8' x 3' x 2" live edge walnut slab table and am trying to create some steel legs...

I'm given a simple table (time(s),position) to make into a graph: 0,0 2,0.6 4.,2.4 6,5.4 8,9.6 10,15 I'm asked to draw tangent lines at 4, 6, and 8 seconds. There is no indication of how they should be drawn, are tangent lines just eyeballed? I see equation involving "lim" online and equations...

https://en.m.wikipedia.org/wiki/Table_tennis_racket Would like to know the impact for the table tennis game if the racket is changed to a String type Lawn tennis or Badminton racket? Thanks & Regards, Prashant S Akerkar

Suppose 6 people want to sit in circular table. This case is considered as cyclic permutation. How about if the 6 people want to sit around a rectangular table? 1. Let say they sit on the longer sides of the table, 3 people on each side and no one sit on shorter side of the table. Is this...

Help with this

I recently posted a couple of multiplication tables and I feel it needs a tweak: \begin{array}{c||c|c|c|c|} V & e & a & b & c \\ \hline \hline e & e & a & b & c \\ a & a & e & c & b \\ b & b & c & e & a \\ c & c & b & a & e \end{array} The LaTeX on the forum doesn't like the double lines ||...

Basically, the F block is a series in the periodic table that consist of elements that are artificially synthesized. My question is, why were these elements synthesized? What was the need of synthesizing such elements?

Homework Statement A rope of mass M and length l lies on a frictionless table, with a short portion, l0 hanging through a hole. Initially the rope is at rest. a. Find a general solution for x(t), the length of rope through the hole.Homework Equations UPLOADED The Attempt at a Solution...

Homework Statement What is dual? Homework EquationsThe Attempt at a Solution Not on net. Meaning of dual i don't know and can't find.

Homework Statement See both images please Homework Equations It is truth table. It has T and F . The Attempt at a Solution What is that double line arrow thing? I can't find on net.

Homework Statement [/B] A 0.02 meters long conductor is placed perpendicular in a homogen magnetic field. Current through the conductor is changed. And we have measured the data here: How can we write the magnetic flux density the correct way? How do I know how many digits my answer should...

Homework Statement Hi I am looking at this question attached part c). 2. Homework Equations The Attempt at a SolutionI can by my notes which tell me that if I reach a column with a negative reduced cost and also all of that column is negative, then to stop, as z is unbounded, to conclude...

Hey guys, First off, Id like to say that I am not an engineering student, I study Physical Therapy. I am wanting to make an old massage table I have pneumatically adjustable height wise. I was thinking of putting a 16 mm bore pneumatic cylinder inside each leg (Or possibly replacing the leg...

I have been searching but I have not been able to find the information I am looking for. I want to build a "floating table" that is supported by one or more compression springs. When an object is added the table will lower by just a bit. As another object is stacked on top of the first one...

neutronics and burnup data step duration time power keff flux ave. nu ave. q burnup source (days) (days) (MW) (GWd/MTU) (nts/sec) 0...

Hi everyone, is this a good place to ask for details of designing and building a table top electric powered winding system? If not thanks for letting me know.

Consider the following open propositions over the universe U = {− 4,−2, 0, 1, 3, 5, 6, 8, 10} P(x): x ≥ 4 Q(x): x 2 = 25 R(x): s is a multiple of 2 Find on a single truth table the truth-values of the following. i. P(x ) ∧ R (x ) ii. [~ Q(x )] ∧ P(x )]

I have my students doing a lab where they have to do and explain the tablecloth trick using Newton’s Laws. The problem I am having is that the one question asks why the quick removal of the tablecloth matters. I know friction is not affected by speed and yet this is the only force acting on the...

Hello! I see this Steam table: It shows Vg but not Vf. It mentions some equations at the bottom. Does anyone know how much is Vf for 0.1bar?

Homework Statement Homework EquationsThe Attempt at a Solution what's the Fa and Fb? my logic is Fa = Wa - N = mg - ##\frac{N}{\cos \theta}## so is Fb... so the ratio is 1. But I know it's wrong. What will make the difference between Fa and Fb? can anyone give a clue please?

If several sheets made of some kind of rubber are being used as acoustic insulators, which configuration would be more efficient to decouple a speaker and a wooden table, absorbing most vibrations? (Ps: Image not drawn to scale)

Homework Statement a uniform fine chain of length l is suspended with lower end just touching a horizontal table. Find the pressure on the table, when a length x has reached the table.. Homework Equations Pressure = force/area The Attempt at a Solution let mass density, m= mass/l...

Homework Statement A point like body with mass m1 is placed on top of a table, that can freely move on wheels with respect to the ground. There is a static friction coefficient of u=0.3 between the body and the table. If the body is subject to the gravitational acceleration g, what is the...

Homework Statement Example 2.12 : A block pulled on a horizontal table with friction. A block of weight 100 Newtons rests on a horizontal table. The coefficient of static friction between the block and the table is µs = 0.8. a. If someone pulls on the block with a force F in the direction 37◦...

Homework Statement [/B] "Use the truth table method in Boole to determine whether the conclusion is a tautological consequence of the premises." (Tet(a) ^ Small(a)) v Small(b) ------ Small(a) v Small(b) Homework Equations [/B] Taller(claire,max) v Taller(max,claire) Taller(claire,max)...

Recently, youtube suggested a video to me on roulette betting theory. The essence of the idea: Start with a small bet. If you win, bet the same, if you lose, double up. If you lose a second time, double again (or bet the sum of your previous bets) until you win. Start over at the small bet. The...

Homework Statement Homework Equations ∑F=ma W = - ΔUs ΔUs = 0.5 k (xƒ)^2 - 0.5 k (xi)^2 W = ΔUs + ΔKE d = viy t + 0.5 * t^2 * a The Attempt at a Solution A) [/B]W = - (0.5 k xƒ^2 - 0.5 k xi^2) = - (0-100) W = 100 J B) W = ΔUs + ΔKE 100 = 0.5 m vf^2 -0 + 0 - 0.5 k xi ^2 100 = 0.5 * 2 * vf^2...

dear physicts I am searching about a journal to submit my article my article contains a big table (3 column and 3000 rows) I found: Atomic Data and Nuclear Data Tables Nuclear Data Sheets but Impact Factor of these two journals are low (about 2) I want a same journal but by High Impact...

I am doing some work on atomic structure. I have an app for referencing the charge radius of nuclei of elements and their isotopes, however I need a table that has the atomic radii of the elements and their isotopes.

Homework Statement How to find percentage = 0.05 , while v = 45 using t -distribution table ? Homework EquationsThe Attempt at a Solution Should i use interploation or just use percentage = 0.05 , while v = 50 to get the t value for percentage = 0.05 , while v = 45 ?

Homework Statement Place a book flat on a table and press down on it with your hand. Now suppose the hand-book and table- book values of are 0.50 and 0.40, respectively; the book's mass is 0.90 kg and your downward push on it is 10 N. How much horizontal force is needed to keep the book moving...

Homework Statement Consider a billiard table with balls of radius r. How high should be the edge of the table to not allow undesirable pressures (and thus slips of the ball)? I.e. if there was no gravity, the billiard ball would still bounce off parallelly to the table plane. However I do not...

Homework Statement I am referring to this thread and question: https://www.physicsforums.com/threads/rotation-of-a-spool-about-rough-ground.295666/ Here is the problem, restated: Homework Equations ##\tau_{net} = I\alpha## ##\tau = Frsin(\theta)## ##F_{net} = Ma_{cm}## ##\alpha = a_{cm} /...

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Homework Statement (General Physics - Algebra based) A 0.75 kg puck rotates in a horizontal circular motion on a frictionless table. It is attached to a string that is looped through a hole at the center of table and circular path. Attached to the other end of the string is a 1.5 kg block that...

Homework Statement Homework EquationsThe Attempt at a Solution

In a physics test in a Norwegian website of a school book, it says following: True or false? (1) According to Newton's 3rd Law, the weight of a book that is on a table is just as big, but opposite the force on the book from the table (normal force). FALSE. (2) According to Newton's 1st Law...

Two small blocks, each of mass m, are connected by a string of constant length 4h and negligible mass. Block A is placed on a very rough tabletop as shown below, and block B hangs over the edge of the table. The tabletop is a distance 2h above the floor. Block A is then released from rest at a...

Lets say I have a massive rod laying on a table with little froction, screwed into the table on one side to become our pivot point, and I lay next to it with my feet pointing towards the rod. First scenario: I position myself very close to the pivot point and push, the rod rotates and I move...

Homework Statement Homework EquationsThe Attempt at a Solution The initial shape of chain is like an inverted "L" with end B just touching the floor . Height of table is "h" . My problem is in identifying the net force on the chain in vertical direction .At any instant of time there are...

Homework Statement Basically there is a results table for the time taken for 20 oscillations. Three examples are 9.90, 11.16 and 12.68. I need to work out the time period to the correct number of significant figures. Homework EquationsThe Attempt at a Solution I divide by 20 to get the time...

I would like to find the 12 to 19 abortion rate per 10,000 women from the following table: This would be the merging of age groups "12-17" with "18-19" to some how get the 12-19 abortion rate. EDIT: "Distribution of abortion age" was translated from "Répartition des ges l'avortement" in...

I was reading this article about table saw safety and it seemed pretty interesting. When I watched the video attached I knew it would be appreciated here. If I ever buy a table saw, it will be one of these: What interesting examples of safety engineering have you seen?

i was watching a video of physics of table tennis and got interested to work it out for myself forces to be considered quadratic drag force magnus force gravity m : mass of the ball v : velocity of the ball w : angular velocity of the ball(assuming for simplicity not changing during the...

Thought this was fascinating.. http://google.com/newsstand/s/CBIw4N3PyjU All the need to do now is make them compulsory.