Thursday

September 3, 2015
Total # Posts: 38,276

**physics**

Draw the figure. Note similar triangles. Let h be the height of the lamppost. h/(5.82+3.88) = 1.92/3.88 check that on your figure.
*August 30, 2015*

**OChem**

two.
*August 30, 2015*

**Algebra II**

The term geometric mean applies only to numbers with the same sign. Whoever gave you the problem made an error.
*August 30, 2015*

**Calculus**

y=( (8x-x^6)(x^-3) )^-4/5 y= ( (8x-2 -x^3) )-4/5 y'= -4/5 (8x^-2 -x^-6)^-9/5 * (-16x+6x^5) I dont think this is the same answer. Check both.
*August 30, 2015*

**Calculus**

correct
*August 30, 2015*

**math**

1. ok, you can forget worrying about the 12, as 24 is in the problem already (if it is divisible by 24, it is automatically divisble by 12). consider 16=4x4 20=4x5 24=4x6 you have four fours, but you will need a 5 and 6 to make a perfect square answer: 4^4 x 5^2 x 6^2=230400
*August 30, 2015*

**Math (Ms.Sue)**

each seat earned 10 dollars... money=10*nmberseats and the number of filled seats is given
*August 28, 2015*

**PHYSICS**

(4-(-2)+3Cx)i + (-5-1+3Cy)j=0 check that, then solve for Cx 4+4=-3Cx or Cx=-8/3 -5-1=-3Cy Cy=2 check all that, I did it in my head.
*August 28, 2015*

**New Light Academy**

volumemetal=outsidediaVolume-insidediaVol = PI/4 * (3.6^2 -2.8^2) per meter in cm^3/m mass60m=volume*density=volumeabove*.044kg/cm^3
*August 28, 2015*

**Chemistry**

calculate the volume of water displaced volume=masszinc/densityzinc now calulate the mass of water displaced mass=densitywater*volumewater now masstotal=211.6-masswaterdisplaced+10
*August 27, 2015*

**Math**

yes, real, and irrational. two plus PI is a real, irrational number
*August 27, 2015*

**physics**

well, it will be along the 60 degree ray force=14cos60
*August 26, 2015*

**king senzangakhona high school**

If this is a question, It makes no sense
*August 26, 2015*

**Science**

Poor question. One could argue B, and C also.
*August 26, 2015*

**physics(measurement)**

stack 50 coins, measure the height. then thickness will be height/50 another way. take 50 coins, measure the thickness of each with a micrometer. Take the average thickness.
*August 26, 2015*

**chemistry**

set both samples (at atmospheric pressure) in a dry ice box, once the both gases are liquified, remove them. The first to boil will be propane (bp -45F), followed by cyclopropane (bp -25F)
*August 26, 2015*

**physics**

I am not certain what you mean by "equal retardation". Is that equal force, or equally absorbing energy? Assuming equal force.. force*timeinPlank=mass*changeinvelocity force=mass*changeV/time=mass*acceleration so if each force is the same, acceleration is constant. ...
*August 26, 2015*

**Physics**

15cm? Wow. at the top, vf=0 vf=vi-2g(.15) solve for vi vf=vi-gt solve for time t at the top. now time of flight is 2*t vf=vi-g(2t)
*August 26, 2015*

**Math**

1.1/1.68=h/8.5 solve for h
*August 26, 2015*

**physics**

latent heat is energy that does not result in a temperature change. Latent energy is part of internal energy. some internal energy is available as potential energy
*August 26, 2015*

**physics**

Heatmelting=KE m*3.3E5=1/2 *2.5*5.7^2 solve for mass m
*August 26, 2015*

**physics**

1/2 *2.5*65^2 * 1/3 =internal energy
*August 26, 2015*

**math**

you have six digits repeating. multiply the number by 1,000,000 8714285.714285714285 subtract the original number -8.714285714285714285 notice the decimal portion disappears and you have 8714285-8, Work that out. Now, since you now have 999 999 time the original number, divide...
*August 25, 2015*

**math**

(sqrtm-sqrt7)/(7-x) multiply numerator and denominator by sqrtm+sqrt7. (m-7)/((7-x)(sqrtm+sqrt7))
*August 25, 2015*

**math help**

because multiplication of powers results in adding exponents, one can reduce this to 3^n*3^1 - 3^n*3^-2 3^n * (3-1/9)=3^n (2 8/9)
*August 25, 2015*

**geometry**

what is 2.25/1.75 ? (9/4)/(7/4)=9/7
*August 25, 2015*

**science**

Trick question. No reaction, all reactants and possible products (Ca(NO3)2 are soluble in the water present. Something has to be insoluble coming out of solution to be a reaction.
*August 25, 2015*

**Math**

volume=lxWxH=2*5.5*1.5= Pur this into your google search engine 2*5.5*1.5=
*August 23, 2015*

**Right byte**

to the right, or below the inserting. However, my workseet editor allows for also above, and to the left insertion.
*August 23, 2015*

**math 540**

http://www.zweigmedia.com/RealWorld/simplex.html you need to write your constraint equations.
*August 23, 2015*

**Science**

CORRECT
*August 19, 2015*

**Math**

1. You play a game where you score -6 points on the first turn and on each of the next 3 turns. What is your score after those 4 turns? For #1 I got -6(4) as the expression and -24 points after those 4 turns. Am I correct? YES. A very stupid game. 2. The outdoor temperature ...
*August 19, 2015*

**physics**

horizontally: work=force*distance=25*10 Joules At an angle: work=25*cos37*10 force is the force in the direction of movement...
*August 19, 2015*

**Life Orientation**

And in here in Austin, UBER is starting this month food delivery: you make your order from the resturant, UBER delivers it. Great for downtown folks, or those really busy. All on an UBER app...the resturant connection, and the delivery instructions.
*August 19, 2015*

**physic**

conservation of momentum... 7*9=(7+9)V solve for V
*August 15, 2015*

**English**

you are correct.
*August 15, 2015*

**maths**

I can make no sense of your question.
*August 15, 2015*

**geometry d the sspeed of the bicycle in m/s**

for each revolution, it goes PI*diameter on the ground. speed: PI*diameter/time time is one second. speed: PI*.77 m/s
*August 15, 2015*

**physics**

Aren't there standard formulas for all this?
*August 15, 2015*

**Chemistry**

I worked in in my head, 20 grams( forget my significant digits), so it looks like you are correct. Check it again, but it is reasonable.
*August 14, 2015*

**Physics**

gravity Earth=gravity moon GMe/(x^2)=GMm/(x-3.8E8)^2 solve for x
*August 14, 2015*

**psychology**

different cultures? Nuture must be different.
*August 10, 2015*

**Physic**

KE=1/2 m v^2= 1/2 .05*4^2 Joules distance=KE/force
*August 10, 2015*

**Work like a scientist**

Typically, one repeats the experiment again...just to be certain...
*August 10, 2015*

**calculus**

vf^2=vi^2+2ad change mph to ft/sec. then solve for a (in ft/sec^2
*August 10, 2015*

**calculus**

d=0=1/2 a t^2=12t^2-7.5t^3/2 t^2(12-7.5sqrtt)=0 sqrtt=12/7.5 t= that squared. check my thinking
*August 10, 2015*

**physics**

you have to add the angle for DISPLACEMENT. the angle is arctan(15/20) W of N
*August 10, 2015*

**physics**

vf=vi+at vi=200m/s vf=0 solve for a
*August 10, 2015*

**Chemistry extra tips**

manganese(VI) oxide dinitrogen monoxide
*July 31, 2015*

**Math**

34.56 x3.002 is the same as 34x3 + 34x.002 + .56x3+.56x.002 so now note. the final decimal place will be decided by the last term above, .56x.002, or .00112 (five digits), which is the sum of the digits of the two numbers being multiplied.
*July 16, 2015*

**PSYCH**

http://www.intropsych.com/ch05_conditioning/taste_aversion.html And you are absolutely totally wrong.
*July 16, 2015*

**college chemistry**

Molarity of diluted acid: 12*(9.6/125) next, the titration equation: Na*Va=Nb*Vb 12*(9.6/125)*24=2*Mb*32.4 solve for molarity of base, Mb
*July 15, 2015*

**South bank uni**

y'=4x^3 y"=12x^2 y"'=24x the degree of the last equation is one, son one inflection point.
*July 15, 2015*

**Physics**

Something is missing here. Is this object in a force field as it moves?
*July 14, 2015*

**tokarara**

work=300cos30 * 20 N.m
*July 14, 2015*

**physics**

compute the diapole moment p (distance x charge) compute the E field between the sheets. Max U= pE
*July 14, 2015*

**Math**

energy=5hr*.115kw cost=energyinKW-hrAbove*9.41 cents/kwhr
*July 14, 2015*

**saviour preparatory school**

pressure=weightonEachFoot/areafoot =.25*500*9,8 N/.08m^2=12.5*.25*500*9.8 P
*July 14, 2015*

**PHYSICS**

positive interference will occur when the thickness is 360 degrees. One gets 180 phase change on the reflection, so thickness is 1/4 wavlength. I do not understand your thickness above, but you want thickness to be 1/4 *lambda
*July 14, 2015*

**physics**

density kid=mass/volume=70000g/80,000 cc = 7/8 g/cm^3 she floats density object=2000kg/1.5m^2 density water=1E3 kg/m^3=1500kg/1.5m^3 it sinks.
*July 14, 2015*

**physics**

height=1/2 g t^2 solve for t
*July 14, 2015*

**Math**

What is the question?
*July 13, 2015*

**Algebra**

now graph the two lines.
*July 13, 2015*

**math**

y(x+3)=-2x+1 does that help?
*July 13, 2015*

**Physics**

potential is the scalar sum... 1.26E3=k6.5E-9/.0201 + kQ/.0121 solve for Q
*July 13, 2015*

**physics**

The net force the "instant"? at t=0-, net force is zero at t=0+, net force is mg(.33-.11) The word instant can have many meanings.
*July 12, 2015*

**Physics**

vf=-vi as it returns to ground. -vi=vi+at 2vi=100 vi=50
*July 12, 2015*

**Physics**

vf^2=vi^2+2ad 50^2=10^2 + 2 a 60 solve for a. then, vf=vi+at solve for time t.
*July 12, 2015*

**math**

what is 4x5x20^2 ?
*July 11, 2015*

**Physics**

It must be when GM1/x^2=GM2(78-x)^2 solve fdr x The value of M3 has no significance.
*July 11, 2015*

**Science**

(Mt+Mb)g+(Mt+Ma)a)=166 solve for a. now, the aforce between the two boxes: Mt(g+a) is that force.
*July 11, 2015*

**Science**

Ff=Fx mg*mu=mv^2/r solve for v
*July 11, 2015*

**Calculus Partial Derivatives**

2w+2h+l<6 volume=lwh dv=whdl+hldw+lwdh=0 from the constraint 2dw+2dh+dl=0 so that is two equations, need one more. I dont see one. I suspect the problem meant for the girth to be a square, thus, h=w. In that case, two equations will suffice. dw=dh, and h=w 2dw+2dw+dl=0 or ...
*July 10, 2015*

**science**

avg velocity =30m/s vf^2=vi^2+2ad 2500=100+2a d or d=1200/a So new issue: we apply -a to stop it first. vf=vi+at=50-a*t or t=50/a to stop. it now has went a second distance of vf^2=Vi^2+2ad 0=50^2-2a d or d=1250/a+1200/a now on the return trip from the max total distance to ...
*July 10, 2015*

**Algebra 2**

when is height 300? 300<-16t^2+1000 -700<-16t^2 t<sqrt (700/16)
*July 10, 2015*

**biology**

Lymphocyte Main article: Lymphocyte Lymphocytes are much more common in the lymphatic system than in blood. Lymphocytes are distinguished by having a deeply staining nucleus that may be eccentric in location, and a relatively small amount of cytoplasm. Lymphocytes include: B ...
*July 9, 2015*

**physics**

sum moments about the fulcrum... 1.1*30-(L-1.1)43 - 20(L/2 -1.1)=0 solve for L
*July 9, 2015*

**Physics**

Figure the force on one of the corners (the sum of the forces from the three other corners). Then figure Q such that it balances this force. Force on one corner: kQq(1/s^2 *.707 + 1/s^2 (.707)+ 1/*sqrt2*s)^2) = kqq/s^2*(1.414+.5) check that I did it in my head. that is the ...
*July 9, 2015*

**physics**

workfriction=mgCosTheta*mu*distance so now is the distance the same?
*July 7, 2015*

**Algebra 2**

end behaviour is negative large for positive x. I dont know what you mean by "leading" term.
*July 3, 2015*

**Physics**

760mmHG is equvalent to 13.6*.760 m =10.34mH2O so add .470/10.34 *760mmHg to each of the readings. I get about 34.6mmHg added.
*July 3, 2015*

**physics**

Assuming your tension is correct, then the inward component of tension is what is counterbalancing centreptal force. horizontaltension=mv^2/r tension*sinTheta=mv^2/r 94.8*sin21=m (2PIr/Period)^2/r solving for period Period=2PIsqrt (m* r/94.8*sin21) check that.
*July 3, 2015*

**Chemistry**

In short: a cathode is heated until electrons are boiled out, then an accelerating field is applied which moves the electrons in a path towards phosphor coated screen. With suitable deflecting fields, the beam can be moved about to strike certain areas. A large positive ...
*June 30, 2015*

**Psychology**

It lends to the argument of nature (biological) control.
*June 30, 2015*

**Chemistry**

I agree with that.
*June 29, 2015*

**Chemistry**

Nope: Lead atoms and copper atoms pack about the same, with the exception that lead has a greater atomic radius than copper (.175nm vs .128), which when cubed gives a volume ratio of (.175/.128)^3 or 2.5. The atomic mass of Pb is 207 vs Cu 63, so the ratio of mass to is 207/63...
*June 29, 2015*

**Stoichiometry chem**

ok, at that point you know how many moles of CaCO3 you have. Now look at the formula: for each mole of CaCO3, there is one mole of C. Moles of C=250.0/100.1 to four decimal places (if your mole mass is correct)
*June 27, 2015*

**science**

PEchanbe=heatadded mgh=m c *(tf-ti) solve for tfinal tf tf=g*h/c + ti It never ceases to amaze me when folks use g=10m/s^2. Nowhere on Earth is it that value. Do they think students are imbeciles and can't use 9.8?
*June 27, 2015*

**Pharmacy Tech Math**

http://www.unc.edu/~bangel/quiz/testivh.htm
*June 27, 2015*

**Chemisty**

how many moles is 24g? then multiply that by -571.6kJ
*June 26, 2015*

**math**

Ms Sue is right, my divider is not working right tonite.
*June 26, 2015*

**math**

isn't that area equal to 5x6 sq yards?
*June 26, 2015*

**physics**

pulling work=800*cos37*8 Joules force friction: (mg-800sin37)mu friction work:(mg-800sin37)mu*8 net work. The pulling did work on friction and the movement net work=pulling work-friction work and the net work will equal the change of KEnergy of the boulder Notice above how ...
*June 26, 2015*

**physics**

work done=forceapplied*distance =.15*30*9.8*450 Joules
*June 26, 2015*

**algebra**

distance1=50t distance2=175(t-5) subtract first equation from second, solve for t: d1-d2=0=125t-5*175 divide by 5, then 25t=175 t=7 hrs distance=7*50
*June 25, 2015*

**Algebra**

ages then: n, n-2, n-4, n-6, n-2(13-1) so last kid is n-24 5*(n-24)=n n=5*6=30 youngestg will be 30-2(12)=6
*June 25, 2015*

**physsics**

momentum change = mass*changeinvelocity I wonder if "both" means masses added together.
*June 25, 2015*

**Physics**

friction force: mg*.387*Cos2.14 PE gained(due to change height)=mg*sin2.14*distance Initial KE+PE gained=frictionwork 1/2 m 5.15^2+mg*sin2.14*distance=mg*.387*Cos2.14*distance solve for distance
*June 25, 2015*

**Science physics**

MA= force output/force input = 30/2 / 10=1.5
*June 25, 2015*

**Science Help. Thank You! (:**

Energy Source % of total Natural Gas 46.5% Coal 15.5% Nuclear 14.9% Renewables 13.5% Large Hydro 9.6%
*June 15, 2015*