# What is Base: Definition and 585 Discussions

An air base (sometimes referred to as a military air base, military airfield, military airport, air station, naval air station, air force station, or air force base) is an aerodrome used as a military base by a military force for the operation of military aircraft.

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1. ### Converting number base of decimals

Transforming ##0.7_8## to base ##5## by multiplying ##5##: ## \begin{array}{r} 0.7 \\ 5 \\ \hline 4.3 \\ 5 \\ \hline 1.7 \\ \end{array} ## ##0.7_8={0.\dot{4}\dot{1}}_5##. This is the correct answer. Transforming ##0.12211_3## to base ##9## by multiplying ##9##: ## \begin{array}{c}...
2. ### What is ##7 \times 7## in base ##7##?

In base ##7##, only the digits ##0,1,2,3,4,5,6## can be used. So ##7 \times 7 = 49## in base ##10##, but ##49## is a multiple of ##7## seven times, so at the right-most digit position of the answer, I can put down a ##0## and carry a ##7 ## to the next-left digit position. I can't put down ##7##...

4. ### Chemistry How do I know whether a base is strong or not?

So I know that I can get whether an acid is strong or not from a table where if ##pK_a## < 0 than it is a strong acid, but there is no such table for bases, so how do I determine whether a base is strong or weak? Also.. for metalhydroxides MOH, which will be strong and which are weak bases...

6. ### I Why is length considered a fundamental (base) quantity?

Hello all, Textbooks define fundamental or base quantities as those quantities which are not expressed in terms of other quantities and they define derived quantities as those quantities which are expressed in terms of other quantities. I have the basic understanding that the choice of a set of...
7. ### How can vinegar attenuate the pain of a bee sting? (acid base reaction)

Hello, I have been working on this subject but I am not sure how to deal with it. I am looking to prove how can vinegar attenuate the pain of a bee sting. I have chosen a specific vinegar that is of 6° and 50 ml and Know the molecular weight of acetic acid is 60g/mol. The bee sting contains...
8. ### Something that doesn't make sense to me about calculating the pH

Hello , the problem that i refer to is present when we try to calculate the pH of a solution without any assumption. in a lecture entitled "calculating the pH of a strong acid/base solution " after adding a certain amount of HCl in water we are asked to calculate the pH (the amount of HCl and...
9. ### What is the Effect of Floating MOSFET Base Plate?

My specific system will benefit from having the MOSFET base plate floating. Are there any downsides to leaving a MOSFET base plate floating? Are there any reasons not to?

29. ### Understanding the base emitter voltage in a common emitter NPN BJT

##V_{BE}## is basically the difference in voltage between the base terminal and the emitter terminal. Normally when silicon is used and the transistor is biased to operate in the active region, ##V_{BE}## = 0.7 V approximately. The way I understand this is that for an npn BJT, the applied...
30. ### I Calculate a spin state as a function of the base spin states

Practically it is said that, given two spin states |u⟩ (up) and |d⟩ (down) - which are the spin measured along the +z and -z semiaxes - such that they are orthogonal ( ⟨u|d⟩ = ⟨d|u⟩ = 0), it is possible to write any other spin states using a linear combination of these two (because they are a...
31. ### B Push from a Narrow Base vs Wide Base

Hello! When moving an object, how do you describe the changes when you push from a narrow base vs a wide base? For example, say you push something heavy with your palm vs your index finger. It feels easier to push from a palm rather than a finger even if the force from my arm is the same but...
32. ### Chemistry What causes the release of ammonia in organic compounds?

I don't really have any idea how to approach this, but the answer says that it is the compounds which are more basic than ammonia liberate it.
33. ### A Simple question on the derivative of base frame

I apologize: despite my verbosity, this is, I hope, a simple question.) Consider the following relationship between a rotating reference frame and an inertial reference frame (both Bold), through a rotation matrix: (the superscript is to designate the rotating frame e(1) and the I is for the...
34. E

### B Is "ten" independent of the chosen number base?

This topic is quite confusing. For instance, if I write ##14_6##, do I pronounce this as "ten", even though we'd probably just say "one-four, base six"? That is to say that we'd treat "ten" as a number of things that we could count out (i.e. corresponding to a certain number of sticks). Another...
35. ### Modeling a wingsuit base jumper's speed

Fgravity = m*g Ffriction = k*A*v^2 Ftotal = Fgravity - Ffriction a = Ftotal/m v = v+a*dt if t<7 then Fgravity>Ffriction if 7<t<67 then v =55,88 (meters per second) if t>67 then A = 45 (square meter) if t>67 then Fgravity<Ffriction the t defines the seconds the first 7 seconds are the free fall...
36. ### A Irradition to base of cylindric gray gas volume

Anyone who has an idea for how to calculate the irradition [W/m2] to the base of a cylinder with radius R, height H, absorption coefficient k, and temperature T? I've looked at the approach with mean beam length by Hottel but cannot figure out what to do when it is the base of the cylinder that...
37. ### Concentrations at equilibrium (strong base weak acid)

So my professor covered acids and bases recently, and this is how he presented the method (please see attached word document). I believe its the same as the I.C.E method, though I am not sure. Anyways my problem is perhaps conceptual, but I don't understand why the concentrations at equilibrium...
38. ### MHB Adding in Base 20: 1HE1C +JDF0 = 2H7GC

Add in base 20 1HE1C +JDF0= 2H7GC from calculator By hand I couldn't get the H Using 1 2 3 4 5 6 7 8 9 A=10 B=11 C=12 D=13 E=14 F=15 G=16 H=17 I=18 J=19 K=20
39. ### Why weld joints are stronger than the base material itself?

I wonder it for a long time and still couldn't find a reliable source. I've seen some posts on the internet saying that welds are mostly stronger than the base material but at first glance it contradicts with my intuition. I'm working on a bicycle frame for myself and the welds are important for...
40. ### I Is it possible for a non-natural number to be a number base?

A commenter at Quora said that is possible for there be something like 12π which would evidently be ( π + 2 ). This seems ridiculous. https://www.quora.com/What-mathematical-symbol-is-the-hardest-to-explain-to-non-mathematicians/answer/Peter-James-Thomas
41. ### (Bipolar Junction Transistor) The Current Gain of Common Base Amplifier

Everything is okay besides the current gain of this circuit, which is "g" there The formula of current gain is I_out/I_in If I call the current flows to R_e I_2, according to KCL, the following formula must be satisfied. I_in + (β+1)I_b = I_2 Therefore, to know I_in, we should use the...
42. ### What is the equation for calculating [H3O+] in a salt of weak acid and base?

Because of character limit I have exposed my question in the attached pdf
43. ### What is the total moment of inertia using the negative area method?

##I_{total} = (I_{1} + A_{1}d_{1}^{2} ) + (I_{2} + A_{2}d_{2}^{2}) + (I_{3} + A_{3}d_{3}^{2})##(d is the distance between centroid of the individual box and centroid of whole shape.) By negative area method by joining the gaps in I section. ##I_{total} = (I_{1} + A_{1}d_{1}^{2} ) - (I_{2} +...
44. ### Safe zero base reactivity level nuclear fission reactor?

There are already 4 generations of nuclear fission reactors. (Compare https://en.wikipedia.org/wiki/Nuclear_reactor#By_generation.) However among these, there does not seem to be a (maximum) safe nuclear fission reactor design, which immediately stops the nuclear chain reaction when the reactor...
45. ### What is the optimal communication time for a given set of parameters?

Hi, I am trying to solve the following equation: ##\mathbf (t_s + t_wm)log(p)+ 2t_h (\sqrt{p} - 1) ## ##\mathbf (10+0.01 * 1000) log(36) + 2 * 2(5) ## I think log(36) would be 18. Note log is ##\mathbf log_2 ## Somebody please guide me. Zulfi.
46. ### Forces acting on the base of a crane

I am attempting the work out the forces acting on the base of a crane. I am yet to come across forces at the base of a crane and am confused as to how to work out the reactionary/moment forces. Any help would be greatly appreciated.
47. ### Pidgeon process for the Moon base ISRU?

I am evaluating the possibility what magnesium may be the most-easily obtainable structural material on Moon. The following ISRU sequence is proposed: 1) Regolith melt electrolysis produce ingots made of ferro-silicon, as by-product of breathable oxygen production 2) Ferro-silicon ingots are...
48. ### Exponential function with negative base

Homework Statement -2^x = y Homework EquationsThe Attempt at a Solution When I plug this function in my graphing calculator, it appears to be 2^x reflected across the x axis. This doesn't make sense to me. For example, for x values of 1 and 2, the value of y is not on the same half of the...
49. ### MHB Limit with x in both base and exponenet

Dear all, I am trying to solve the following limit: $\lim_{x\rightarrow 0}(e^{ax}+x)^{\frac{1}{x}}$ where $a$ is a constant. I know that the limit is equal to $e^{a+1}$ but not sure how to prove it. Thank you.
50. ### B Base e to an imaginary exponent seeming contradiction

<Moderator's note: Moved from a homework forum.> 1. Homework Statement Given 0 < a < 1, i = √(-1), ei2πa = cos 2πa + i sin 2πa but also, ei2πa = (ei2π)a = 1a = 1 How to resolve the apparent contradiction?Homework Equations eab = (ea)b eix = cos x + i sin xThe Attempt at a Solution No clue...