Thursday

October 30, 2014

October 30, 2014

Total # Posts: 496

**Hydraulic Physics**

20/25 = F/50 F = (20/25)*50 F= 40 N
*October 29, 2014*

**Hydraulic Physics**

No need for gravity. F1/Area1 = F2/AREA2 Solver for F1
*October 29, 2014*

**Dudas**

They key thing you need to know is what the center of mass formula is. Center of mass: (m1*x1+m2*x2)/(m1+m2) So at initial center of mass: (86*9+55*2)/(86+55) = 6.27 m So now do apply the same equation when they switch position: (55*9+86*2)/(86+55) = 4.73 m So now find the ...
*October 29, 2014*

**Physics**

How did you start this problem?
*October 29, 2014*

**Physics**

Just a quick question… Did this problem come with a figure? I can't tell if those angles are along the horizontal or vertical.
*October 28, 2014*

**physics**

Veocity = distance / time You are given a distance of 40m and time of 1.9s
*October 28, 2014*

**physics**

When doing these types of physic problems or actually any physics problem, write down what's given. m=57.5 kg v_f= 58.9 m/s v_i = 0 (because it was a rest, not moving) t = 14.4 s g=9.81 m/s^2 The apparent weight is: W = F + m*g F=ma Everything is given to us in the problem...
*October 28, 2014*

**Algebra**

I almost agree with Aaliyah. Expressions do not need an equal sign so you can just write: 2m+7 but everything else that Aaliyah has posted is on point.
*October 27, 2014*

**math**

Set this up as a system of equation then solve: x = chalk y = stapler x+2y = 10 <--- equation 1 3x+2y = 18 <---- equation 2 Now, there are many methods when solving systems of equation, but I would use substitution method for this problem. Look at the first equation: x+...
*October 27, 2014*

**Math**

Actually after reading the problem, I think I rounded wrong. 338700 should be the correct answer.
*October 27, 2014*

**Math**

Set up an equation then solve: 320000 = x - x*(.055) where x is the amount they must sell their house for minus the 5.5 interest rate and still maintain 320000 x = 338624 But it says to round to the nearest $100, so x = 338600
*October 27, 2014*

**Physics**

Whoops, I think my units are off because since k is measured in N/m I need to convert cm to m Answer should be .03 Joules
*October 27, 2014*

**Physics**

Potential Energy of the compressed string at x=3.0cm: W = (1/2)*k*x^2 where k = spring constant = 15 N/m x = distance = 3.0 cm W = (1/2)*15*3^2 W = 67.5 Total work: W_t = (1/2)*k*x^2 where x = 4+3 = 7 W_t= (1/2)*15*7^2 W_t = 367.5 W_t - W = 367.5 - 67.5 Work needed for the ...
*October 27, 2014*

**math**

For the first problem just use a calculator to convert everything into decimals. a= 3.5 b = sqrt(15) =3.87 c = sqrt(1/16) = .25 d = 26/100 = .26 It's clear after converting everything, that choice b is the greatest Numer 2: Irrational numbers are numbers that cannot be ...
*October 27, 2014*

**Math**

For everyone 1 goat, there are 4 sheep. 50*4 = 200 200 sheep
*October 27, 2014*

**Math**

Set up an equation: (1/4)x = (2/3)*60 Solve for x to get how much Peter has x = 160 160 + 60 = 220
*October 27, 2014*

**Physcis**

There's a formula for this! R = R_o * A^(1/3) R_o =1.3*10^-15 m A = nucleon number which in your case is 85 R = (1.3*10^-15)* 85^(1/3)
*October 27, 2014*

**Math**

a = (max-min)/2 d=(max+min)/2 is period given in the problem?
*October 27, 2014*

**physics**

If you want to check your answer, I got 283.19N
*October 27, 2014*

**physics**

I wish i could post a link of my FBD here, but the website won't allow any links to be posted. It's really hard to explain on here if you can't see a free body diagram. Could you show me how you started it and maybe I can try to follow what you're doing?
*October 27, 2014*

**physics**

John, first draw a free body diagram. then break each vectors up into x and y components Fx = 5.6cos75 - 3.8cos45 Fy = 5.6sin75 - 3.8sin45 Direction: tan^-1(Fy/Fx)
*October 26, 2014*

**algebra**

A(t)=3-2t^2+4^t just plug 2 in for t to get A(2) then plug 1 in for t to the given equation to get A(1) Then A(2) - A(1)
*October 26, 2014*

**Math**

Thats correct so far.
*October 26, 2014*

**Physics**

Part a) Assume that downward is positive for this problem. V=V_o + g*t V_o = 2.13 g=9.8 t=4.38 V=2.13 + (9.8*4.38) V = 45.1 m/s part b) x= V_o*t + (1/2)*g*t^2 x=(2.13*4.38)+(1/2)*9.81*4.38^2 x=103.43 note that the helicopter is going down at: x1=2.13*4.38 = 9.33 X = x - x1 X...
*October 26, 2014*

**algebra**

Wait Mr. Reiny, I think there is a typo. 3x^2+x-2=0 So there should be two roots x= -1 x = 2/3 And since the question is asking for "integer", I guess only -1 works since 2/3 is a fraction which is not an integer.
*October 22, 2014*

**algebra**

Equation: 3x^2 + 1*x = 2 I don't think that equation will factor, so you're going to have to use the quadratic formula to find what x is. 3x^2 + x - 2 = 0 I got x to be -1 and 2/3 Let me know if you got the same from applying the quadratic formula
*October 22, 2014*

**physics**

So it takes the blade .398s to move 90 degrees a full circle is 360 degrees 360/90 = 4 So time it takes to move around whole circle: T = .398*4 = 1.59s Velocity = Distance / time Distance in this case is the circumference of circle: C=2*pi*r where r is radius so C = 2*pi*(.352...
*October 22, 2014*

**Algebra**

First find the slope of the line through those coordinates. Slope formula: m = (y2-y1)/(x2-x1) m=(7-3)/(4-5) m=4/-1 m=-4 So the slope is -4 Now use the point slope formula: y-y1=m(x-x1) y-3 = -4(x-5) y-3=-4x+20 y=-4x+23 You will get the same result if you use the other ...
*October 22, 2014*

**math**

First you have to find how much each chairs cost 560/16 = 35 So each chair cost $35. 35 * 24= 840
*October 22, 2014*

**PHYSICS**

Part a) Moment of Ineria for a sphere (formula is different depending on the shape: I = (2/5)*m*r^2 I = (2/5)*14.5*.120^2 = .0835 Angular momentum = I * angular velocity .0835 * 6.15 = .51 kgm^2/s Part B) Kinetic energy = (1/2)*.0835*(6.15)^2 = 1.579 J
*October 22, 2014*

**physics**

Is that the whole question? I'm guessing to break that force up into x and y components Fx = 52.8cos18 Fy = 52.8sin18
*October 22, 2014*

**Math - Please Help Check My Answer**

The answer the student has is correct. c = -1/13 The correct answer is A The answer is negative.
*October 22, 2014*

**physics**

D = speed * time just make sure to convert your units. Give it a try!
*October 22, 2014*

**guidance**

Key word: NOT B.
*October 22, 2014*

**Physics**

oops tan^-1(368.85/190.5) = 62.68
*October 21, 2014*

**Physics**

hmm.. Vx= 220cos30 = 190.5 Vy = 110 s=-Vy*t + (1/2)*a*t^2 2800 = -110*t + (1/2)*(9.81)*t^2 use quadratic equation to solve for t t=37.6s v=g*t v=9.81 * 37.6 v=368.85 tan^-1(v/vx) tan^-1(368.85/110) = 73.39 See if that's correct..
*October 21, 2014*

**physics**

a=(vf-vi)/t vf=73.6 * (1/3600)*1609.34 = 32.9 m/s vi = 0 (at rest) a=32.9/7.68 = 4.28 m/s^2
*October 21, 2014*

**Precalculus**

a) radius of a circle a=pi*r^2 to write this as a function of r a("r")=pi*r^2 pug in what r is to find what a equals b) r(t) = 2.2t where you plug in what your t is to give you r try using what I gave you for part a and b to find out the rest. Post if you have ...
*October 21, 2014*

**Math**

weekly revenue rate = -500*1 Price decrease rate = -.45 Marginal Revenue = (-500*1)(-.45) = 225
*October 21, 2014*

**Math**

This type of problem involves a lot of trig idenities, I just looked them up.. Lets look at the LHS: csc^2(x)= 1/sin^2(x) cos^2(x) = 1-sin^2(x) Now we can say: csc^2(x)*cos^2(x) = (1-sin^2(x))/sin^2(x) now lets look at the RHS: csc^2(x) = 1/sin^2(x) and we can change that 1 to...
*October 20, 2014*

**physics**

Note that "r" and "g" cancels out when you put the coefficient of friction equal to each other for car A and car B
*October 20, 2014*

**physics**

Coefficient of friction is: u=v^2/(r*g) now lets apply this formula to the problem Set Car A = Car B and you get V_a^2/V_b^2 = u_a/u_b v_b=v_a*sqrt(u_b/u_a) (13.8)*sqrt(.843/.333) = 21.95 m/s
*October 20, 2014*

**TYPO**

Made a small typo.. Answer is y+9 =(7/8)*(x+2)
*October 20, 2014*

**Jay**

Yeah
*October 20, 2014*

**Jay**

Point slope form is y-y1 = m(x-x1) y-(-9) = (2/7)*(x-(-2)) y+9 =(2/7)*(x+2)
*October 20, 2014*

**Algebra**

You gotta make the graph, use those points.
*October 20, 2014*

**Algebra**

x coordinate can be all negative # and zero y can only be all negative # so make a t chart x=0,-1,-2,-3,-4,-5……. y=-1,-2,-3,-4,-5,-6….
*October 20, 2014*

**physics**

Was velocity given in the figure?
*October 20, 2014*

**MISTAKE**

Oops, I made a mistake.. (4500*.04)+(.1*x)=1000
*October 20, 2014*

**algebra**

Set this up as an equation. (4500*.1)+(.1*x)=1000 solve for x to get your answer.
*October 20, 2014*

**Algebra**

Well, rate of change = slope deltaY/deltX = slope deltaY = (y2-y1) deltaX =(x2-x1) For the year 1990-1992: deltaY = (55-52) = 3 deltaX =(1992-1990) = 2 3/2 = 1.5=slope So basically, you have to pick 2 years where deltaY > 3 deltaY <= 2 so the only years that meet those ...
*October 18, 2014*

**physics**

Sorry, I made an error… Vector A has both an x and y component: Fx=10cos25=9.06 Fy=10sin25=4.266 Magnitude of A = sqrt(9.06^2+4.266^2) = 10.0141 Vector B only has x components: Fx=8 Magnitude of B = 8 10.0141*8 = 80.112
*October 18, 2014*

**physics**

If I'm reading this correctly, the question wants you to find the magnitude of vector A and then multiply it to magnitude of vector B. If that's the case then… Vector A has both an x and y component: Fx=10cos25=9.06 Fy=10sin25=4.266 Magnitude of A = sqrt(9.06^2+4....
*October 18, 2014*

**Intermediate Algebra**

find the average of hours of homework completion. (6+9)/2 = 7.5 hours
*October 18, 2014*

**Trigonometry**

sin^-1(12/13) = 67.38 180-67.39 = 112.62 = A sin^-1(-7/25) = -16.26 = B Tan ( A - B) = ??? I think that's how you approach it.. someone verify please?
*October 15, 2014*

**math**

4+x+2=9
*October 15, 2014*

**math**

1/(8000*450) = 2.77*10^-7
*October 15, 2014*

**math**

Wait it's 2x+5=-c
*October 15, 2014*

**math**

I agree with your answer.
*October 15, 2014*

**Algebra 2 (PLEASE, HELP ME!)**

I think for part C: match a t chart for x and y for the light weight, x can be anything bigger than 200 and lower than 230 so x can be 200 all the way to 229 Now do the same for the heavy weight class then plot them. for part D: It's asking at what point the lines ...
*October 15, 2014*

**algebra**

Hmm.. lets start with the polynomial (x+13)(-x+12) = -x^2 - x + 156 part b) The discriminant is everything inside the square root of the quadratic formula 150= -x^2 - x + 156 -x^2-x+6 a=1 b=-1 c=6 so: b^2-4*a*c is the discriminant -1^2 - 4*-1* 6 = 25 and 25 > 0 part c) Just...
*October 15, 2014*

**Physics**

Kinetic energy + Potential Energy (1/2) *m*vf^2 + (1/2)*m*vi^2 = mgh m=mass but we we really don't need the mass to figure this problem out since we can factor it out of the equation Now isolate the vf vf = sqrt(2*g*h - vi^2) g=9.81 h=30 vi=45 vf=sqrt(2*9.81*30 - 45^2) vf=...
*October 15, 2014*

**Math**

97 rounded to nearest ten gives 100 97 rounded to nearest hundred gives 100 118 rounded to nearest ten gives 120 118 rounded to nearest hunted gives 100 5 rounds to nearest ten is 10 179 rounded to nearest ten gives 180 179 rounded to nearest hundred gives 200 5091 rounded to...
*October 15, 2014*

**physics**

if you still need this i'll take a shot at it.. I drew this a free body diagram of this You should get a triangle when you do this where 228 is your hypothenuse is 228 so the formula to to find the missing side is c^2=a^2+c^2 where c=228 and a=50 so the missing side b = ...
*October 15, 2014*

**math**

x=semir y=sarah z=sung semir sold 3 times as many meals as sarah x=3*y sung sold 2 more meals than sarah. z=2+y y=y so 3*y + y + (2+y) = meals sold you can simplify more 3y+2y+2
*October 14, 2014*

**Math**

I set up as an equation: (1/2)*x*3 = 324 solving for x will give you the total cost of the three pairs of shoes x=208 324-216 = 108 hand bag is $108
*October 14, 2014*

**Pre-Cal**

It mean's that the college of nursing students doesn't have to take statistics
*October 14, 2014*

**physics**

F=ma F=Force m=mass a=acceration F/m = a 3.25/3.8 = .855m/s^2 a=.855 m/s^2 now we have to find velocity at given time a*t=v .855*16.5 = 14.11 m/s now momentum formula p=m*v p=momentum m=mass v=velocity p=3.8*14.11 = 53.616 Ns Someone check my work.
*October 14, 2014*

**math**

Or if it's written (7 * 4) - (4/2) = 26 then its correct.. Actually, I think this post is the one you should look at
*October 13, 2014*

**math**

(7 x 4 - 4)/2 = 26 PEMDAS Do calculations in the parenthesis first: 24/2 = 26 Do you think that's true or false?
*October 13, 2014*

**Math**

C probably.
*October 13, 2014*

**Algebra 2**

should get a diagonal line
*October 13, 2014*

**Algebra 2**

Make a t chart and plug in an initial x to get your y to get your points then graph. for example: pick 1 for x as your starting y=|1|/2 - 3/4 y=-1/4 so first points are x=1 y=-1/4 x=2 y=??? x=3 y=??? so on..
*October 13, 2014*

**Math**

surface arena of a cone: A=pi*r(r+sqrt(h^2+r^2)) where r=radius Given: A= 258 cm^2 r=4 cm find h 258=(3.14*4)(4+sqrt(h^2+4^2)) 258=12.56(4+sqrt(h^2+16)) 258/12.56 = 4+sqrt(h^2+16) 16.54 = sqrt(h^2+16) square both sides 274.233 = h^2 + 16 258.233 = h^2 h=16.0696
*October 13, 2014*

**pre cal**

circumference of a circle: C=2*pi*r where r=radius=27/2=13.5ft pi=3.14 C=84.78 It's making 2 rotations every 2 seconds or in other words, 1 rotation every 1 second. note its asking for mph: 1hour=3600 12inch=1foot 1mile=5280 Formula to solve this: (n*C*3600)/(12*5280) ...
*October 13, 2014*

**math**

There are 75 employees, and they all get 2 weeks off per year, so total weeks off for everyone is: 75*2 = 150 weeks Now: 1 year = 52.18 weeks The total weeks that all 75 employees work without the 2 week vacation is: 75*52.18 = 3913.5 Total week - vacation week=net working ...
*October 13, 2014*

**MATH 101**

Can't really factor anything out of this. (7 a - 3 b) (8 a + 9 b) If you FOIL: you get 56a^2+39ab-7b^2 I just kind of did trial and error.
*October 13, 2014*

**Math**

If you tried 1 2 3 4 and took the product you would get 24 which doesn't equal one of the above numbers, so this combination wouldn't be correct.
*October 13, 2014*

**Math**

Take a look at 0,1,2,3 Those are 4 consecutive numbers. Now lets take the product of them: 0 * 1 * 2 * 3 = 0 As you can see, it's equal to one of the integers which is 0 So that meets the requirement. From those set of numbers, 3 is the largest.
*October 13, 2014*

**Algebra**

Hmm.. Let's break this down with what is given. There is a total of 1065.95 total. Mary has 122 in the cash register initially. So subtract 1065.95 - 122 = 943.95 943.95 is the total items she sold including tax Let's Figure out that amount excluding the tax, which is ...
*October 13, 2014*

**Math**

x<= 2100-300p 600 <= 2100 -300p p<= 5
*October 12, 2014*

**Algebra 2**

ah okay, well it's really basic algebra then. Just isolate the h h=(3v)/(pi*r^2)
*October 12, 2014*

**Algebra 2**

So…. what's given and what does it ask you to solve for?
*October 12, 2014*

**Math**

A = 1, otherwise the product would have 5 digits. D = 9 because A = 1. B = 0 or 1, otherwise the product would have 5 digits. If B = 1, then C = 0, otherwise the product would have 5 digits. But 1109 * 9 = 9981, which isn't right. So B = 0. Then 9*D = 9*9 = 81, so 8 + 9*C ...
*October 12, 2014*

**sci207**

LOL, this is a funny question.
*October 12, 2014*

**Algebra**

Yes. You are correct. y=3x plug 1000 into x 3 * 1000 = 3000
*October 12, 2014*

**engineering science N4**

I feel like the weight of the steel block has to be given in order to solve this problem…
*October 12, 2014*

**maths**

I set this up as a polynomial x^2-64x+960 factor this (x - 40)(x-24) where you it's roots to be 40 and 24 so 40 + 24 = 64 40 * 24 = 960
*October 12, 2014*

**CHEMISTRY**

First find molar mass of C6H12O6: I found it to be 180.1566 g/mol now find the ratio of moles 5.85/180.1566 = .0325mol Molality of C6H12O6: (.0325*1000)/255 = .127 note: the value 1000 is from the density of water which is 1.00g/mL So freezing point: delta_T = -k_f * m k_f = 1...
*October 12, 2014*

**physics**

yeah you are right, ignore my post.
*October 12, 2014*

**physics**

Final Velocity of 2.2kg ball: Vf = (V_i *(m1-m2) + (2m2*v_i2)/(m1+m2) v_i =1.27 m1=2.20 m2=7.2 v_i2 = 0 (because it was a rest initially) Vf=(1.27*(2.2-7.2)+(2*7.2*0)/(1.27+7.2)) =-6.35 For final Velocity of 2nd object: Vf = (V_i2 *(m2-m1) + (2m1*v_i/(m1+m2) Vf=(0*(7.2-2.2)+(2...
*October 12, 2014*

**Science quick question urgent check my answer**

Spores form part of the life cycles of many plants, algae, fungi and protozoa. In bacteria, spores are not part of a sexual cycle but are resistant structures used for survival under unfavourable conditions. --Wikipedia
*October 1, 2014*

**Math**

The college president asks the statistics teacher to estimate the average age of the students at their college. How large a sample is necessary? The statistics teacher decides the estimate should be accurate within half year and be 92% confident. From a previous study, the ...
*September 21, 2014*

**math **

you download 12 new songs to your mp3 player. then you delete 5 old songs.. write each amount as an integer?
*August 28, 2014*

**Math**

What do I do next after that?
*August 2, 2014*

**Math**

but i dont get the first one
*August 2, 2014*

**Math**

Simplify the following expressions by using trigonometric form and De Moivre's theorem a. (√3-i)^4 b. (-4+4i√3)^5 c.(2+3i)^4 d. (4-i)^6
*August 2, 2014*

**algebra**

A three quarter inch wire has 12 ohms resistance. How much resistance has the same length of half-inch wire, if resistance varies inversely as the square of the diameter?
*May 23, 2014*

**English**

What is a metaphor for a deep voice?
*May 22, 2014*

**Math homework help**

Check out the polar coordinate pairs that label the same point. Several pairs may be possible. A) (2, 2pi/3) B) (2, -pi/3) C) (-3, pi) D) (2, 7pi/3) E) (3,0) F) (-3,0) G) (-2, -pi/3) H) -3, 2pi)
*May 17, 2014*

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