Wednesday
April 23, 2014

Posts by Elena


Total # Posts: 4,311

Physics
Figure???

Physics
h = v²/2g

physics
γ= 2.675•10⁸ T⁻¹•s⁻¹ γ/2π =42.58 MHz/T f= γ•B = 2.675•10⁸•3 = 8.0250•10⁸s⁻¹ B1=3 + 3•10 ⁻⁵•10=3+3•10⁻⁴ T=3.0003 T f1= γ•B1 = 2....

physics
v=5.2/tan30 = 9m/s

Physics
h=v²/2g=5.6²/2•9.8 =1.6m. Upward motion W1=-mgh= - 0.135•9.8•1.6= - 2.12 J Downward motion W2= mg(H+h) = 0.135•9.8•(1.94+1.6) =4.68 J W= W1+W2 = -2.12 +4.68 = 2.56 J.

physics
F(fr)=mv²/R

physics is annoying
ΣFx= -F(A) •cos47 +F(C)cosφ=0 ΣFy= F(A) •sin47 +F(C) sinφ –F(B) =0 -227•0.68 +175•cosφ=0 227•0.73 +175•sinφ –F(B) = 0 154.36 =175•cosφ cosφ=154.36/175 = 0.88 φ= 28.36° sin28.36°=0...

physics to be solved ..easy !!
Misprint Vy•t - a•t²/2 = 2.11. The solution is correct. Check my calculations

physics to be solved ..easy !!
Vx•t = 15.1 V•cos(33.8) •t = 15.1 t=15.1/(V•cos33.8) (1) Vy•t+ a•t²/2 = 2.11 V•sin(33.8)•t - 0.5•(9.8)•t²= -2.11 (2) Plugging (1) into(2) V•sin(33.2)( 15.1/(V•cos33.8) - 4.9•{15.1/(V•cos33.8) }2 = ...

physics help needed very urgent !!!
m1 = 10.5 kg, m3 = 14.7 kg, m4 = 22.05 kg, T2 = 120 N, and T4 = 236 N. m2=? (m1+m2+m3+m4)a=T4 (m3+m4)a=T4-T2 (10.5+m2+14.7+22.05)a =236 (14.7+22.05)a=236-120 a=116/36.75 =3.16 m/s² (10.5+m2+14.7+22.05)a =236 m2={236-(10.5+14.7+22.05)3.16}/3.16 = 27.43 kg

Physics
ma=μmg a=μg v=v₀-at,

Physics URGENT!!!
Please see the Related Questions below

Physics
E = v / d

Physics
N=q/e =6•10⁻⁶/1.6•10⁻¹⁹=3.75•10¹³=4•10¹³

physics
s=s1+s2+s3 =20•2+40•2+60•6 =480 m t=t1+t2+t3 =2+2+6 =10s v(ave) =s/t =480/10=48 m/s ---D

physics
F1+F2=F(fr)=μ•m•g μ=(F1+F2)/m•g

Physics
Value of the force is decreased by four. F=k•q1•q2/r² If r2=2•r1, F2=F1/4

Physics
F=qvBsinα If sinα=0 F=0

colledge physics
Question???????

Physics
I=Imax/sqrt2=2.1 A

Physics
The light waves are out of phase with each other.

Physics
ΔPE=e•Δφ=e•E•d E= ΔPE/e•d= 8•10⁻¹⁷/1.6•10⁻¹⁹•2.5=200N/C

Physics
m1=2250 kg, m2 =330 kg, R=550 N, a= 2 m/s² m1•a=F-R-T m2•a =T- m2•g a(m1+m2)=F-R-T+T-m2•g F= a(m1+m2) +m2•g+R=... T=m2(a+g)=…

Physics
6.00 cm

physics ..PLEASE HELP ASSIGN DUE SOON :(
k =9•10^9 N•m²/C² r=0.037m F13=k•q1•q3/r², F23=k•q2•q3/r², Cosine law for forces: F=sqrt[F13²+F23²- 2•F13•23•cos120°]

physics help
(a) T=mg =12•9.8 =... (b) F(fr)=T-mgsinα= ... (c) ma =mg-T T=m(g-a)

Physics
m•a= μ•m•g•cosα a= μ•g•cosα v=at = μ•g•cosα•t W= ΔKE=KE2-KE1 =mv²/2 -0= mv²/2

Physics
km/h -> m/s W=ΔKE=KE2-KE1=mv²/2- 0= mv²/2

Physic
Question??????

physic
mgh=mv²/2 v²=2gh, a= v²/2s=2gh/2s F=ma

Physics
W(P)=P•cosα•d=... W(fr)= - F(fr) •d= - μ•N•d = = - μ•( m•g•cosα+P•sinα) •d W(gr) = - m•g•h = - m•g•d•sin α = ...

phyics help nedded
(a) m(A)a=T1 m(B)a=m(B)g-T1+T2 m(C)a=m(C)g-T2 a{m(A) + m(B)+m(C)} = T1+ m(B)g-T1+T2 + m(C)g-T2 =g{ m(B)+m(C)} a= g{ m(B)+m(C)}/{ m(A) + m(B)+m(C)} =9.8(40+30)/(24+40+30) =7.3 m/s² T1 =m(A)a=24•7.3=175.2 N T2 = m(C)(g-a) = 30•(9.8-7.3)= 75 N (b) s=at²/2 = 7....

Physics. please help! due tomorrow!
W1=ΔKE=KE2-KE1=mv²/2- 0= mv²/2 W2 = ΔKE=KE3-KE2= =m(2v)²/2- mv²/2= 3mv²/2 =3W1

Physics- Elena please help!
Find solution in Related Questions

PHYSICS !!!!!!!!!!
E=kx²/2

Physical Science
Q=λm E=mgh Q=E λm= mgh h=λ/g = 335000/9.8 = 34184 m

7th grade social studies Ms.Sue please
All answers are correct

phyiscal chemistry
Usrful link http://www.chemguide.co.uk/physical/phaseeqia/phasediags.html

7th grade math Ms.Sue help please
4. d(x) =3-(-2)= 5, d(y) =2-(-2) =4 d=sqrt {d(x)²+d(y)²} = sqrt{25+16}= 6.4. 5. d(x) =1-(-3)= 4, d(y) =2-(-1) =3 d=sqrt {d(x)²+d(y)²} = sqrt{16+9}= 5

Physics
a(τ)=0.52 m/s², R=500 m v=? s=? t=? ------ v=a(τ) •t centripetal (normal) acceleration is a(n)=v²/R =( a(τ) •t)²/R = a(τ), a(τ) ² •t²/R = a(τ), t=sqrt{R/a(τ)}=sqrt{500/0.52)= 31 s, s=a(τ) •t&#...

physics
A=πR² = π(2.85•10⁻²)² =8.12•10⁻⁴ m² G=1.16•10⁷N/m², F=10 N L=7.14•10⁻³ m Δx =? G=(F/A)/( Δx/L) = F•L/A•Δx . Δx= F•L/A•G=10•7.14•10⁻...

physics
ρ=m/V=m/L•W•H = =23•10⁻³/6•10⁻²•5•10⁻²• 0.883•10⁻²= =868.3 kg/m³

physics
m1=0.395 kg, h=1.5 m, m2= 0.65 kg, H=? m1•g•h=m1•v ²/2 v =sqrt(2•g•h)=sqrt(2•9.8•1.5)=5.4 m/s m1•v = m1•v1+m2•v2 For the case of elastic collision v2=2 •m1•v/(m1+m2)= =2•0.395•5.4/(0.395+0.65) =2.67 m/s...

Physics
v₁₀=4.7 m/s, m₁=0.107 kg; v₂₀=6.8 m/s, m₂=0.214 kg v₁=? v₂=? ----------- v₁= {2m₂v₂₀ +(m₁-m₂)v₁₀}/(m₁+m₂) v₂={ 2m₁v₁₀ + (m₂-m₁)v̀...

physics
F=F(fr) 370=μ(s)•m•g μ(s)=370/mg, μ(k)=332/mg,

Physics
L=vₒ²•sin2α/g, t= 2vₒ•sinα/g

physical science
h=gt²/2

physics
ma=F1+F2 F2=ma-F1=2.8•2.5 -12 =-5 N (in -x-direction)

physics
m•v=F•Δt F= m•v/Δt

physics
14.mi/h/s=1.83m/s²

physics
v=a•t a=v/t If the power output of the car remains constant,a=const v(f) =v(i) +a•t1=> 3•v=v+v•t1/t 2•v=v•t1/t t1=2t (b) v2=a•9•t= v•9•t/t=9•v

Physics
1.The units on both sides of the equals sign, expressed in SI base units, must be the same. 3.Ns (mv=Ft) 4.Ns 5.N/C

College Physics
F =G•m1•m2/R² the gravitational constant G =6.67•10^-11 N•m²/kg²,

Physics
F=mv/t

physics
0=m1•v1+m2•v2 v2= - m1•v1/v2= - 1.16•3.2/2.32 =1.6 m/s. KE1=0 KE2=m1•v1²/2 +m2•v2²/2 =... ΔKE=KE2-KE1=KE2

physics
a=F/m = 35.6/21.2=1.68 m/s²

Physics
L=vₒ²•sin2α/g =19²sin2•45/9.8=36.8 m At the distance of 36.8 m from the first building the ball is at the level of starting point and has the velocity v(x)=v₀•cos45° =13.4 m/s The distance to the second building is 50-36.8 = 13.2 m...

physics need help please
The field in the center due to one point charge which has no opposite charge is E=kq/r² = 9•10⁹•5•10⁻⁹/0.03²=5•10⁴ V/m φ=7• kq/r = 7•9•10⁹•(-5•10⁻⁹)/0.03 =-1.05•10⁴ V

Physics- PLEASE HELP
F=m2•a

Physics- PLEASE HELP
m₁=58 kg, v₁₀=4.2 m/s, m₂= 0.45 kg, v₂₀= 26 m/s v₂={ 2m₁v₁₀ - (m₂-m₁)v₂₀}/(m₁+m₂) = ={ 2•58•4.2 - (0.45-58) •26}/(58+0.45)= =33.9 m/s. F=m•Δv/t = m•(v&...

Physics IB
When the balls are moving in opposite directions the magnitudes of their velocities are v₁= {-2m₂v₂₀ +(m₁-m₂)v₁₀}/(m₁+m₂) v₂={ 2m₁v₁₀ - (m₂-m₁)v₂₀}/(m₁+m₂)

Physics
m1=66.1 kg, v1=2.29 m/s m2=0.046 kg, v2= 31.7 m/s m3=60.5 kg, v3=0 u1=? u3=? The law of conservation of linear momentum (m1+m2) •v1 =m1•u1 +m2•v2 u1= [(m1+m2) •v1- m2•v2]/m1 = =[(66.1+0.046) •2.29 – 0.046•31.7]/66.1 = 2.269 m/s m2•v...

Physics
133 mi/h=59.5 m/s F=m•Δv/Δt=12.8•59.5/0.1=7616 N

Physics
The 1st ball: PE+KE₀=KE mgH+mv₀²/2 =mv1²/2 v1=sqrt(2gH+ v₀²) The 2nd ball: upwards motion KE1=PE1 mv₀²/2 =mgh h= v₀²/2g. downwards motion: PE2=KE2 mg(H+h) = mv2²/2 v2=sqrt{ 2g(H+h)}= = sqrt{ 2g(H+ v₀²/2g )}...

physics
R=1.2 m, ε=1.8 rad/s² (a) ω=ε•t => t= ω/ε, (b) 2πN= ε•t ²/2 N= ε•t ²/4π (c) v= ω•R (d) a(τ)= ε•R (e) a(n)=ω²•R (f) a=sqrt{ a(τ)²+a(n)²}

PHYSICS ASAP!
L=vₒ²•sin2α/g = 66.6 t= 2vₒ•sinα/g = 5.39 vₒ = t•g/2•sinα L=vₒ²•sin2α/g= t²•g²•2•sinα•cosα/g•4•sin²α= t²•g/2•tanα tan&...

Physics
a=F/m = 50/40 =1.25 m/s² Δ v=a •Δ t =2•4 = 8 m/s Δp= m •Δ v= 40•8 = km•m/s

PHYICS NEED HELP BAD!
L=vₒ²•sin2α/g = 66.6 t= 2vₒ•sinα/g = 5.39 vₒ = t•g/2•sinα L=vₒ²•sin2α/g= t²•g²•2•sinα•cosα/g•4•sin²α= t²•g/2•tanα tan&...

Physics URGENT!!!
x: m1•v1=(m1+m2) •v(x) y: m2•v2 =(m1+m2) •v(y) v(x)= m1•v1/(m1+m2) =75•6/(75+82)=2.87 m/s v(y) =m2•v2 /(m1+m2)= 82•5/(75+82)=2.66 m/s v=sqrt[v(x)²+v(y)²] =3.91 m/s φ =arctan {v(y)/v(x)} =42.8⁰ ∆K = Kf −Ki...

Physics URGENT!!!
x: m•v1=(m1+m2) •v(x), y: m•v2 =(m1+m2) •v(y), v(x)= m•v1/(m1+m2), v(y) =m•v2 /(m1+m2), v=sqrt[v(x)²+v(y)²], φ =arctan {v(y)/v(x)}. ∆K = Kf −Ki = =(m1•v²/2 +m2•v²/2) - (m1 +m2) •v²/2. mecha...

physics
L=vₒ²•sin2α/g = 66.6 t= 2vₒ•sinα/g = 5.39 vₒ = t•g/2•sinα L=vₒ²•sin2α/g= t²•g²•2•sinα•cosα/g•4•sin²α= t²•g/2•tanα tan&...

Physics
mv²/2=kx²/2 k= mv²/x²= 200•25²/5² = … N/m

Physics
φ is the angle between the force ‘F’ and the crank ‘r’ φ₁=180°-90°-65° =25° φ₂=180°-90°-30° =60° The work is dW= M•d φ=F•r•sinφ•dφ W=∫ F•r•sinφ...

Science
speed

PHYSICS!!!!!!!!!!!!!!!!
H=4 m, h=1.7 m, v=2 m/s H-h= g•t²/2 t=sqrt[2• (H-h)/g] = … s=v•t=...

Physics
(M+m) •a=T•sinθ (M+m)g= T•cosθ a/g= T•sinθ/ T•cosθ=tanθ a=g• tanθ T=(M+m) •a/ sinθ=(M+m) • g• tanθ/ sinθ

physics
m1=1.2 kg, r1=0.2 m, - cylinder: J1=m1•r1²/2 m2 = 0.4 kg, r2=0.01 m – cylinder: J2=m2•r2²/2 m3=0.8 kg r3=0.15 m – hollow sphere: J3= 2m3•r3²/3 J=J1+J2+J3 = ...

Physics HELP!!
k =9•10^9 N•m²/C² r=0.037m F13=k•q1•q3/r², F23=k•q2•q3/r², Cosine law for forces: F=sqrt[F13²+F23²- 2•F13•23•cos120°]

physics
s=at²/2 a=2s/t²=2•12/25²=0.0384 m/s² v=at=0.0384•25=0.96 m/s PE=KE+W(fr) PE=m•g•h=m•g•s•sinα, KE=mv²/2, W(fr) =μ•m•g•cosα•s, m•g•s•sinα= mv²/2+ μ•m...

Physical science
Q1=Q2 c(i) •m(i) •ΔT(i) = c(w) •m(w) •ΔT(w) 444• m•18.6=4180•0.2•2 m=4180•0.2•2/444•18.6 =0.2 kg

Physics
y: N=mg+F•sinα x: F•cosα=F(fr) =μ•N=μ•( mg+F•sinα) F=μ•m•g/(cosα-μ•sinα)

Physics
m2=2•m1 m1•g•sinα =T m2•g•sinβ=T m1•g•sinα= m2•g•sinβ m1• sinα=2•m1• sinβ sinβ=sinα/2=sin45/2=0.354 β=arcsin0.354=20.7°

Physics
The law of conservation of linear momentum for the inelastic collision x: m1•v1=(m1+m2) •v• cos30° y: m2•v2=(m1+m2) •v• sin30° v1=2•v• cos30° v2=2•v• sin30° (m1+m2) •a=F(fr) a= F(fr)/(m1+m2)=F(fr)/2m=10000/...

physics
k=2.75•10¹º A/m⁴ R=0.003 m i=∫JdA=∫k•r²•2•π•r•dr= k•π•R²/2 =3.5 A The rate of thermal energy generation is P=i•V=3.5•60=210 W. Assuming a steady rate, the thermal energy generated...

physics
v=gt t=v/g

physics
zero

physics
(a) PE=mgh=mgL KE = mv²/2 Law of conservation of energy PE =KE mgL= mv²/2 v=sqrt(2gL)=... (b) Law of conservation of linear momentum mv= (m+m1)u u= m•v/(m+m1)=... (c) Law of conservation of energy KE1=PE1 (m+m1) •u²/2 =(m+m1) •g•h1 h1=(m+m1) ...

Physics- Elena please help!
Law of conservation of energy KE =PE (m1+m2) •u²/2 =kx²/2 u=sqrt{kx²/(m1+m2)}=..... Law of conservation og linear momentum m1v + 0= (m1+m2)u v=(m1+m2)u/m1 =....

Physics
(b)

Physics
no figure

Physics
ma=F-F(fr) F(fr)=F+ma = 200 +60•2 =320 N

Physics
E=mv²/2 =50•25²/2=15625 J=3732 cal

Physics
E=mv²/2 =50•25²/2=15625 J=3732 cal

Physics- Elena please help!
h1=(m+m1) •u²/2 • (m+m1) •g =u²/2 •g= =4²/2•9.8=0.82 m

Physics- Elena please help!
(a) PE=mgh=mgL KE = mv²/2 Law of conservation of energy PE =KE mgL= mv²/2 v=sqrt(2gL0=sqrt(2•9.8•2.05)=6.34 m/s. (b) Law of conservation og linear momentum mv= (m+m1)u u= m•v/(m+m1)=80•6.34/(80+47)=4 m/s (c) Law of conservation of energy KE1=PE1 (...

Physics HELP!!
g=G•M/(R+h)², the gravitational constant G =6.67•10^-11 N•m²/kg², Earth’s mass is M = 5.972•10^24 kg, Earth’s radius is R = 6.37 •10^6 m. h=7220000 m

PHYSICS
A) E=P•24•3600 = ... B) E=mgh h=E/mg= P•24•3600/60 •9.8 = ....

Physics
T•cosα=m•g T=mg/cosα = =10500/cos10°= 10660 N

physics
You need the length of muddy stretch ‘s’ ma=F(fr) =μmg, => a= μg. a=(v² -v₀²)/2s μg=(v² -v₀²)/2s v= sqrt(2sμg+ v₀²)

Physics URGENT!!!
m=2 kg , m1=70+2=72 kg, m2= 50 kg v =9 m/s, Δh=4 m, h=20 m (a) m1•v =(m1+m)v1 v1= m1/(m1+m) (b) KE1+ΔPE=KE2 (m1+m)•v1²/2+(m1+m)•g•Δh=(m1+m)•v2²/2 v2=sqrt(v1²+2g•Δh) (c) (m1+m)•v2= (m1+m2+m) • v3 v3 = (m...

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