Thursday
August 21, 2014

Posts by Elena


Total # Posts: 4,331

Law
2. http://en.wikipedia.org/wiki/Diversion_program
June 10, 2014

physics
Here, u1 = 30 km/h t = 2 s u2 = 33.6 km/h a = (u2 – u1)/t a1 = (33.6 – 30)/2 = 1.8 ms-2 Similarly, a2 = (37.2 – 33.6)/2 = 1.8 ms-2 The acceleration of the vehicle is 1.8 ms-2
June 10, 2014

MATH
B. 5/51
June 9, 2014

MATH
I think it's B. The probabilities change every time a bill is pulled out. The probability of pulling out a 1 first is 5 out of 18 which is .227 then the probability of pulling out a 10 is 6 out of 17 because you don't replace the bill. since the events are independent ...
June 9, 2014

MATH
I think it's B. The probabilities change every time a bill is pulled out. The probability of pulling out a 1 first is 5 out of 18 which is .227 then the probability of pulling out a 10 is 6 out of 17 because you don't replace the bill. since the events are independent ...
June 9, 2014

business
This site will show you what you need http://www.opengroup.org/public/arch/p4/bus_scen/bus_scen.htm
June 8, 2014

algebra
This site shows you how to find terms of the sequence http://www.math-magic.com/sequences/next_term.htm
June 5, 2014

I may fail the 8th grade?
1. Take a deep breath. 2. I may be able to help. 3. post questions on your homework here and either ms.sue will help or me. BTW HELP we wont give you the answers but we will ensure help and explanations and you will get it right
June 5, 2014

Biology
A virus is a rudimentary biosystem that has some of the aspects of a living system such as having a genome (genetic code) and the ability to adapt to its environment. A virus, however, cannot acquire and store energy and is therefore not functional outside of its hosts. ...
June 5, 2014

biology
A capsid is the protein shell of a virus. It consists of several oligomeric structural subunits made of protein called protomers. A prion is an infectious agent composed of protein in a misfolded form.
June 5, 2014

Psychology
Read this and find your answer http://www.sirc.org/publik/drinking3.html
June 5, 2014

Psychology
What may ultimately make an abnormal behavior into a genuine mental disorder is if the behavior: 1. is maladaptive (harmful to self or others) 2. causes significant social impairment 3. causes significant occupational impairment 4. causes great personal pain and emotional ...
June 5, 2014

biology
The basic difference is their components. Viruses contain both nucleic acids (DNA or RNA) and a protein coat. Viruses cause infection by inserting their genetic material in a host cell. The host cell then replicates and reads the genetic material, making new viruses that ...
June 5, 2014

Algebra
there are 56 ways
June 5, 2014

Algebra
use the 8C3.now, can u evaluate the value of 8C3 ?.nCr = n!/r!(n-r)!it is the general formula of combination. also u have know about the "factorial", like 3! = 3 * 2 * 1 = 6 8C3, in this case knowed n=8 and r=3. by using the formula above, it can be 8C3 = 8!/3!(8-3...
June 5, 2014

Measurment
To answer this question, you'll need to find the surface area of the top of the container (which is a circle), along with the surface area of the side of the container.Note that the diameter of the container is given and is 6 inches; therefore, the radius is ... what? Note...
June 5, 2014

english
I think its either A. or C. but im not sure. Maybe A
May 28, 2014

english
In "A Man Called Horse," After his wife leaves him, Yellow Robe Behaves recklessly in battle because he A. would rather die than live with the bitterness he feels as a result of his lost pride B. is trying to gain membership in the society known as the foxes C. ...
May 28, 2014

english
I think its D
May 28, 2014

english
writers portray the personalities of characters A. only through revealing the characters private thoughts. B. through plot complication. C. only if the plot is not important to the story. D. through a variety of methods.
May 28, 2014

7 grade math
Thank you @Bobpursley!!
May 27, 2014

7 grade math
Consider two types of nonlinear equations. What unique quality does each possess and how does that quality cause the graph's unique shape? Name two unique examples of these shapes in real-world situations.
May 27, 2014

URGENT Physics help
F=kq₁q₂/r² q₂= F r²/kq₁= 7.2•10⁻²/9•10⁹•4•10⁻⁶= =2•10⁻⁶ C = 2μC Cpper rod is an electrical conductor; the others are insulators.
May 7, 2014

Physics
C=q/Δφ q=C Δφ
May 7, 2014

engineering
In the question I have some strenths and w/c ratios of some specimens and it is asking me about the range,molds?Also,How many specimens should be taken for each batch of concrete? This is a question before we learn it,so really have some understanding problems.
May 4, 2014

engineering
Hello guys.I got a homework and seem like I am stocked. a)What type of experiments should be done to find the relationship between the strength of concrete and water/cement ratio. b)what will be the range of the water/cement ratio? It would be great if you help.Thank you!
May 4, 2014

Math
To Damon: thank you so much for your help :))))))
April 29, 2014

Math
To Steve: I just copy that from my child's textbook as it is. Thank you for your great advice, I'll forward it to his math teacher.
April 29, 2014

Math
Hector has $450 and saves 20 per week. Tim has $1200and spends $30 per week.write a system equation for this situation
April 29, 2014

Physics 194
d•sinφ=kλ, tanφ=x/L. => d•x/L=kλ λ₁=dx₁/Lk λ₂=dx₂/Lk λ₁/λ₂=dx₁Lk/dx₂Lk= x₁/x₂ λ₂=λ₁x₂/x₁=630•0.21/0.26=508 nm
April 25, 2014

Physics
bsinφ=k λ sinφ=kλ/b, a) sinφ=1•630•10⁻⁹/0.020•10⁻³=0.0315 φ=1.8° b) sinφ=1•630•10⁻⁹/0.20•10⁻³=0.0035 φ=0.18° c) sinφ=1•630•10⁻⁹...
April 25, 2014

physics
a=ω²R, F(fr)=μN=μmg, ma =F(fr) => mω²R₁= μmg m(2ω)²R₂=μmg ω²R₁=4ω²R₂ R₂=R₁/4
April 24, 2014

Physics
E=0
April 19, 2014

physics
Imagine that F₂ is along the x-axis, F is along y-axis, and F₁ is directed to the “north-west”. The angle between F and F₁ is α. sin α = F₂/ F₁=1/2 α=30° Thus, the angle between F₁ and F₂ is 90°+30°...
April 19, 2014

Physics
W=mg
April 18, 2014

physics
1/λ₁ =Z²R[(1/n²) – (1/m²)] =2²•1.1•10⁷[(1/1²) –(1/3²)] λ₁=2.56•10⁻⁸ m 1/λ₂ =Z²R[(1/n²) – (1/m²)] =2²•1.1•10⁷[(1/2²) –(1/...
April 17, 2014

physics
E=5eV=8•10⁻¹⁹ J λ=h/p = h/sqrt(2mE) = =6.63•10⁻³⁴/sqrt(2•9.1•10⁻³¹•8•10⁻¹⁹)=5.5•10⁻¹⁰ m
April 17, 2014

physics
S=Energy per unit time/Area = Nhf/A= =4Nhc/πD²λ= =4•1.42•10¹⁸•6.63•10⁻³⁴•3•10⁸/π•(1.82•10⁻³)²•524•10⁻⁹= =2.07•10⁵ W/m² Electric ...
April 17, 2014

physics
(a) 1/do+1/di =1/F 1/di=1/F-1/do=1/48.5•10⁻³- 1/3.85•10⁸. di≃48.5•10⁻³m x/di=D/do x=D•di/do =3.48•10⁶•48.5•10⁻³/3.85•10⁸.= =4.38•10⁻⁴ m (b) 1/do₁+1/di₁...
April 17, 2014

physics
tan(α/2) =x/L => x=L tan(α/2) Coordinate of the second dark fringe is x=(2k+1)Lλ/d L tan(α/2)= (2k+1)Lλ/d d/λ =(2k+1)/tan(α/2)= (2•2+1)/tan3.6°=79.5
April 17, 2014

Physics
(i) h=gt²/2 t=sqrt(2h/g)=sqrt(2•10000/9.8)=45.2 s. (ii) v=800000/3600 = 222.2 m/s s=vt =222.2•45.2 =10044 m (iii) x=0 (since the horizontal speed of the cargo is constant)
April 14, 2014

Physics
The speed of sound at 20°C v=343 m/s s=vt=343•3=1029 m
April 14, 2014

Physics
If the detector (radar)is at rest and the source (moving car that reflects the sound)) is moving away from the detector, the observed frequency f is less than the actual frequency f₀. The speed of sound v =343 m/s f=f₀v/(v+V) V=v(f₀-f)/f =343•(1.5-1.4)&#...
April 14, 2014

physics
KE=mv²/2 v²= 2•KE/m a= v²/2s F=ma=mv²/2s= 2m•KE/2s m= = KE/s=10/0.005 =2000 N
April 14, 2014

physics
v₁ =910 m/s m₂=1000 kg v₂=10000 m/s u= 1000 m/s m₁=? (m₁+m₂)u = m₁v₁ +m₂v₂ m₁=m₂(v₂-u)/(u-v₁)= =1000(10000-1000)/(1000-910) = 100000 kg
March 25, 2014

Trigonometry
find sin2x, cos2x, and tan2x if sinx= -2/sqrt 5 and x terminates in quadrant III
March 25, 2014

physics
v=v₀+at = 10.5+(4.4•4.2) = 28.98 m/s
March 25, 2014

Phyics
1. x: ma=mg•sin α –F(fr) y: 0=-mg•cos α +N ma=0 0= mg•sin α-μN= = mg•sin α-μ•mg•cos α tan α = μ =0.4 α=arctan0.4 =21° 2. ma=mg•sin α – μ₁mg•cos α a=g&#...
March 20, 2014

Physics
The blocks move with the same acceleration ‘a’ F(fr)= μN m₁g=W₁ => m₁=W₁/g= 77/9.8=7.86 kg m₂g=W₂ => m₂=W₂/g= 114/9.8=11.63 kg x: m₁a=m₁g•sin α -μ₁N₁-T y: 0=-m₁g...
March 20, 2014

physics
1. PE=KE PE=mgh=mg•s•sinα KE=mv²/2 mg•s•sinα=mv²/2 v=sqrt(2g•s•sinα) = =sqrt(2•9.8•1.8•sin22°)=3.64 m/s v=at => a=v/t s=at²/2= vt²/2t=vt/2 t=2s/v=2•1.8/3.64 =0.99 s 2. t₁=2t=0.99...
March 20, 2014

Science
p=mv=20•5 =100 kg•m/s
March 20, 2014

Physical Science
(60 W•24hours •30 days)/1000=43.2 kW•h 43.2•0.1$=4.32$
March 20, 2014

Physics
T=ma=mv²/L m=TL/v²
March 20, 2014

Physics
An angular speed ω=v₁/R₁=v₂/R₂ v₁/v₂= R₁/R₂=9.8/6.6 =1.48
March 20, 2014

Physics
T=ma=mv²/R=1.9•2.8²/2.3= 6.48 N
March 20, 2014

Physics
B= μ₀•I/2π•d= μ₀•q•t/2π•d q=2π•d•B/ μ₀•t= =2π•28•7.3•10⁻⁵/4π•10⁻⁷•2.2•10⁻³=4.64•10⁶ C
March 20, 2014

Physics
L is the length of the solenoid N is the number of turns d is the diameter of the wire r is the radius of the solenoid (of the turn) Resistance R=ρx/A=4ρx/πd² ρ=1.6•10⁻⁸ Ω•m μ₀=4π•10⁻⁷ H/m U...
March 20, 2014

MATH
explain how to construct a perpendicular bisector
March 12, 2014

Science
the process in which body cells are duplicated in order to grow and repair body tissues is called
March 6, 2014

Physics
p=mv
February 27, 2014

physics
W=mg
February 27, 2014

physics
mg =ma =mv²/R v=sqrt(gR)=sqrt(9.8•0.6)=2.4 m/s
February 26, 2014

Physics
Work W=F•s•cosθ cosθ= W/F•s= 43/60•2=0.358 θ=69° ma=Fcos θ a=v²/2s= 2.7²/2•2 = 1.82 m/s² m= Fcos θ/a=60•0.358/1.82 =11.8 kg
February 26, 2014

Physics
Q=mλ=6.68•335000=2.24•10⁶ J
February 26, 2014

Physics
F =G•m₁•m₂/R² the gravitational constant G =6.67•10⁻¹¹ N•m²/kg², F=6.67•10⁻¹¹•0.005•10/0.25=...
January 22, 2014

Physics
mgsinα=F sinα=F/mg=3.06x10^6/1.39x10^4 =0.022 α= 1,26 degr
January 13, 2014

Physics
T=1/f=1/2= 0.5 s
January 13, 2014

physics
h=gt²/2 t=sqrt(2h/g) x=v(x) •t => v(x) =x/t=x/sqrt(2h/g) = =8.3/sqrt(2•4.3/9.81)=8.9 m/s
January 11, 2014

Physics
v= v₀+at=30.55-0.805•20=14.5 m/s =14.5•3600/100=52.04 km/h
January 11, 2014

Science question
Coal is solid, the other substances are liquids and gas Answ A http://library.thinkquest.org/3646/earth/resources/fosfuels.html
January 10, 2014

Physics Classical Mechanics Help ASAP
http://cnx.org/content/m14614/latest/
January 10, 2014

physics
mgh=mv²/2 v=sqrt{2gh} =sqrt{2•9.8•2.9} =7.5 m/s v(fin)=v-at v(fin)=0 a=v/t x=vt -at²/2=vt/2 mv²/2 =W(fr) = F(fr) •x => F(fr)= mv²/2x = 2mv²/2 vt=mv/t = =70•7.5/0.58 = 905.2 N
January 10, 2014

physics
a) W+Fx =80•0.882=70.56 J b) W=KE =mv²/2 v=sqrt(2W/m) = sqrt(2•70.56/15)=3.07 m/s c) KE=W(fr) =F•x F=W(fr)/x=KE/x=F/x = 70.56/0.045=1568 N
January 9, 2014

physics
W/A =Y(ΔL/L) ΔL=W•L/A•Y= =mg•L/πr²•Y
January 7, 2014

Physics help quick!
The force is directly proportional to 1/r2 where r is the distance. 19 AU 9.8 N/kg
January 7, 2014

science
q=K(ΔT/Δx)WL= =0.84•19•0.9•1.5/0.004 =5386.5 W
January 7, 2014

physics
Weight on one foot =480/2=240 N Pressure under her soles =Weight/area = =240/area of one sole
January 5, 2014

physics
240N
January 5, 2014

physics
PE=W(fr) kx²/2=μmgd d= kx²/2μmg= =124•2.1²/2•0.7•7•9.8 =5.7 m
January 5, 2014

physics
m₁v₁-m₂v₂=-m₁u₁+m₂u₂ u₂= (m₁v₁-m₂v₂+m₁u₁)/m₂= =(1250•30-2000•25+1250•10)/2000 = 0
January 5, 2014

Need help World Geography
1.B 2.D http://en.wikipedia.org/wiki/Slum
January 4, 2014

Physics
A) W=∫F•dx=-∫kx•dx (limits ↓0↑x) =kx²/2 or ΔW=F•Δx =-kx •Δx, W=ΣΔW= Σ(-kx•Δx)= =- kx Σ{(0-x)/2}= kx²/2 B) W= kx²/2=80•0.35/2 =14 J
January 3, 2014

physics
h=gt²/2 => t=sqrt(2h/g) =sqrt(2•73/9.81) =3.86 s v(y) = gt = 9.81•3.86 =37.87 m/s v=sqrt{v(x)²+v(y)²} =sqrt{37.87²+40²}=55.08 m/s p=mv=Pv/g =177•55.08/9.81 =993.85 kg•m/s tan α =v(y)/v(x) =37.87/40 =0.947 α=arctan0.947...
January 3, 2014

AP Calculus AB
y´=3(cosx)²(-sinx) -3(sinx)²cosx= = - 3 sinx cosx(cosx+sinx)
January 3, 2014

Need help World Geograpy
3A 6C 7C 10B 12C 13D 17D 18B 20B
January 3, 2014

Physics
P=Fv=mav a=P/mv=4300/900•13.8=0.35 m/s²
January 2, 2014

physics
PE=KE mg(H+h) =mv²/2 v=sqrt{2g(H+h))
January 2, 2014

Physics
P=Fv=mav a=P/mv=4300/900•13.8=0.35 m/s²
January 2, 2014

Physics
Q =q•W•L•t= 1380•1000•1300•12•3600= =7.75•10¹³ J Q=cmΔT ΔT= Q/cm = Q/cρV=7.75•10¹³/4180•1000•1000•1300•300= =0.048 K
January 2, 2014

Physics
m₁=36 kg, c₁= 880 J/kg•K, m₂=4 kg, c₂=387 J/kg•K Q=m₁c₁ΔT + m₂c₂ΔT = = ΔT(m₁c₁ + m₂c₂). ΔT= Q/(m₁c₁ + m₂c₂)= =60000/(36•880+4•387) = 1.8 K
January 2, 2014

Physics
a=dv/dt= -b+2ct =-0.31+2.1•10⁻³•36= =-0.2344 m/s² P=Fv=ma•v = 1264•0.2344•18.36 = 5439.7 W
January 2, 2014

physics
Y=2•10¹¹ Pa ω=2πf =2π•2=4π rad/s. ma=T-mg m ω²R =T – mg T=m(ω²R+g) =m(16π²R +g)=… T/A =Y•ΔL/L ΔL=TL/AY =…
January 2, 2014

physics
No
January 2, 2014

physics
V=53•10⁶ ft³=1.5•10⁶ m³ h=45720≈46000 m The density of the air ρ=2•10⁻³ kg/m³ The buoyant force is F=mg= ρVg=2•10⁻³•1.5•10⁶•9.8 =29400≈ 30000 N Answer (d) M=800 kg m...
January 1, 2014

Physics
W(horse) =W(fr) =μNs= μmgs m=W/ μ gs= 8000/0.25•9.8•62=52.7 kg If the rope is horizontal and v=const => T= F(fr) = μmg=0.25•52.7•9.8 =129 N
January 1, 2014

Physics 221
E=Δφ/Δx PE->W(work of electric field) -> KE W=e•Δφ=e•E•Δx KE= mv²/2 mv²/2= e•E•Δx v=sqrt{2•e•E•Δx/m}= =sqrt{2•1.6•10⁻¹⁹•1000•0.001/9.1•10&#...
December 31, 2013

Physics
mv²/2 = kx²/2 +μmgs ==== W(spring) = kx²/2=... E(fr) = μmgs=... v =sqrt{kx²/m +2μ gs}=...
December 31, 2013

Physics - please help me..
W(block) =kx²/2=252•0.29²/2=10.6 J W(spring) = - 10.6 J mv²/2 = kx²/2 v=x•sqrt(m/k)= =0.29•sqrt(0.395/252) =0.0115 m/s
December 31, 2013

physics
KE(rot)=Iω²/2 =MR²ω²/2•2 KE(tr)=0.25•KE(rot) KE(tr)=0.25•MR²ω²/4 mv²/2 = MR²ω²/16 v=(Rω/4)•sqrt{2M/m)=4.5 m/s C. 4.5 m/s
December 30, 2013

physics
M= 5.97•10²⁴ kg m=500 kg r = 6.378•10⁶ m. R= 2• 0⁶ km= 2• 10⁹ m GmM/r-GmM/R = mv²/2 GM(1/r -1/R) = v²/2 v=sqrt{2GM(r-R)/rR}= =sqrt {2•6.67•10⁻¹¹• 5.97•10²⁴(2• 10&#...
December 27, 2013

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