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August 30, 2014

Posts by Elena


Total # Posts: 4,331

Physics
(a)ma=F-F(fr) F(fr)= F-ma (b) F(fr) =μmg μ=F(fr)/mg
October 21, 2012

Physics
m=F/a
October 21, 2012

Physics
F(y) =Fsinα
October 21, 2012

Physics
g(Moon) =g1=1.63N/kg. m=W1/g1=2000/1.63=1227 kg W(Earth)=W2=mg=1227•9.8=12025 N
October 21, 2012

physics
v=v₀+at v₀=0 v=at a=v/t s=at²/2
October 21, 2012

physics
ma=F(fr) =μmg a= μ•g v=v₀-at
October 21, 2012

physics
1. N1=(m(per) +m(cr))g 2. N2=m(per)g
October 21, 2012

Physics
zero V/m
October 21, 2012

Physics
Ñ=q/V= 3.3x10^-6 F
October 21, 2012

Physics
(a) Torque1= W•L•sinα = 12000•2.5•sin32°=… (b) Torque2=T•L•cosα=54200•2.5•cos32°=…
October 21, 2012

physics
T1= 101◦F =311.48K T2= 70°F=294.26 K Since the emissivity is 1, the object is the black body => P=R•A= σ•T⁴•A ΔP= σ•T1⁴•A - σ•T2⁴•A = σ•A•( T1⁴ - T2⁴)= =5.67•...
October 21, 2012

Physics
n=33rpm=33/60 =0.55rev/sec ω =2πn=2π•0.55=3.45 rad/s The rod is rotating clockwise about ITS CENTER OF MASS. The center of mass is at r=4.63/2 =2.315 m from each end of the rod.Then M=Iε =(m1•r²+m2•r²)•ω/t = r²(m1+m2...
October 20, 2012

physics
1. N1=(m(per) +m(cr))g 2. N2=m(per)g
October 20, 2012

physics
c. takes a short time to cool off.
October 20, 2012

Physics
Work=P •m•t= P•m•s/v= =6.5•75•145000/13.5=5.23•10⁶J = = 1.25•10³ nutr.Cal. Now it's OK
October 20, 2012

Physics
Work=P •m•t= P•m•s/v =6.5•75•145000/13.5=5.23•10⁶J =1.25 nutr.Cal.
October 20, 2012

Physics
Work= •m•t= P•m•s/v =6.5•75•145000/13.5=5.23•10⁶J =1.25 nutr.Cal.
October 20, 2012

Physics
Power is the rate of energy (here, kinetic energy) => P=W/t= mv²/2t = 114•18.2²/2•2.7 = 6993 W = =9.37 hp 1 hp = 745.66272 W
October 20, 2012

Physics
m•v²/2=mgh=m•g•s•sinα v=sqrt(2• g•s•sinα)
October 20, 2012

Physics
m•v1²/R1=T1 m•v2²/R2=T2=4•T1 v2²=4•v1²•R2/R1 W=KE2-KE1 = m•v1²/2 - m•v2²/2 = = m•v1²/2- m• 4•v1²•R2/2•R1 = = m•v1² { 1- (2•R2/R1)}/2= = 0.82•21²{1-(2&#...
October 20, 2012

physics
KE=PE KE= KE(transl) +KE(rot) = =m•v²/2+Iω²/2= = m•v²/2+ (2mR²)• v²/5•2•R²= = m•v²/2+ mv²/5 =0.7 mv² 0.7•m•v²=mgh v=sqrt(g•h/0.7)
October 19, 2012

Physics
Guitar pickups are tiny coils with magnets inside them. The magnets magnetize the steel strings. When the strings vibrate, voltage is induced in the coils and boosted by an amplifier, and sound is produced by a speaker.
October 19, 2012

Physics
2Tsinα=mg T=mg/2sinα
October 19, 2012

Physics
t=s/{v(plane)-v(wind} !!! km/h -> m/s
October 19, 2012

Physics
T=mgsinα
October 19, 2012

Physics
F=2•F(fr)+mg =2•μ•N +mg N=(F+mg)/2• μ
October 19, 2012

Physics
Figure???
October 19, 2012

Physics
h = v²/2g
October 19, 2012

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....
October 19, 2012

physics
v=5.2/tan30 = 9m/s
October 19, 2012

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.
October 19, 2012

physics
F(fr)=mv²/R
October 19, 2012

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...
October 19, 2012

physics to be solved ..easy !!
Misprint Vy•t - a•t²/2 = 2.11. The solution is correct. Check my calculations
October 19, 2012

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...
October 19, 2012

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
October 19, 2012

Physics
ma=μmg a=μg v=v₀-at,
October 19, 2012

Physics URGENT!!!
Please see the Related Questions below
October 19, 2012

Physics
E = v / d
October 19, 2012

Physics
N=q/e =6•10⁻⁶/1.6•10⁻¹⁹=3.75•10¹³=4•10¹³
October 19, 2012

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
October 19, 2012

physics
F1+F2=F(fr)=μ•m•g μ=(F1+F2)/m•g
October 19, 2012

Physics
Value of the force is decreased by four. F=k•q1•q2/r² If r2=2•r1, F2=F1/4
October 19, 2012

Physics
F=qvBsinα If sinα=0 F=0
October 19, 2012

colledge physics
Question???????
October 19, 2012

Physics
I=Imax/sqrt2=2.1 A
October 19, 2012

Physics
The light waves are out of phase with each other.
October 19, 2012

Physics
ΔPE=e•Δφ=e•E•d E= ΔPE/e•d= 8•10⁻¹⁷/1.6•10⁻¹⁹•2.5=200N/C
October 19, 2012

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)=…
October 19, 2012

Physics
6.00 cm
October 19, 2012

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°]
October 19, 2012

physics help
(a) T=mg =12•9.8 =... (b) F(fr)=T-mgsinα= ... (c) ma =mg-T T=m(g-a)
October 19, 2012

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
October 19, 2012

Physics
km/h -> m/s W=ΔKE=KE2-KE1=mv²/2- 0= mv²/2
October 19, 2012

Physic
Question??????
October 19, 2012

physic
mgh=mv²/2 v²=2gh, a= v²/2s=2gh/2s F=ma
October 19, 2012

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 = ...
October 19, 2012

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....
October 19, 2012

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
October 18, 2012

Physics- Elena please help!
Find solution in Related Questions
October 18, 2012

PHYSICS !!!!!!!!!!
E=kx²/2
October 18, 2012

Physical Science
Q=λm E=mgh Q=E λm= mgh h=λ/g = 335000/9.8 = 34184 m
October 18, 2012

7th grade social studies Ms.Sue please
All answers are correct
October 18, 2012

phyiscal chemistry
Usrful link http://www.chemguide.co.uk/physical/phaseeqia/phasediags.html
October 18, 2012

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
October 18, 2012

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&#...
October 18, 2012

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⁻...
October 18, 2012

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
October 18, 2012

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...
October 18, 2012

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)v&#...
October 18, 2012

physics
F=F(fr) 370=μ(s)•m•g μ(s)=370/mg, μ(k)=332/mg,
October 17, 2012

Physics
L=vₒ²•sin2α/g, t= 2vₒ•sinα/g
October 17, 2012

physical science
h=gt²/2
October 17, 2012

physics
ma=F1+F2 F2=ma-F1=2.8•2.5 -12 =-5 N (in -x-direction)
October 17, 2012

physics
m•v=F•Δt F= m•v/Δt
October 17, 2012

physics
14.mi/h/s=1.83m/s²
October 17, 2012

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
October 17, 2012

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
October 17, 2012

College Physics
F =G•m1•m2/R² the gravitational constant G =6.67•10^-11 N•m²/kg²,
October 17, 2012

Physics
F=mv/t
October 17, 2012

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
October 17, 2012

physics
a=F/m = 35.6/21.2=1.68 m/s²
October 17, 2012

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...
October 17, 2012

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
October 17, 2012

Physics- PLEASE HELP
F=m2•a
October 17, 2012

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...
October 17, 2012

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)
October 17, 2012

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•...
October 17, 2012

Physics
133 mi/h=59.5 m/s F=m•Δv/Δt=12.8•59.5/0.1=7616 N
October 17, 2012

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...
October 17, 2012

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}
October 17, 2012

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...
October 17, 2012

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
October 17, 2012

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...
October 17, 2012

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...
October 17, 2012

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. ...
October 17, 2012

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...
October 17, 2012

Physics
mv²/2=kx²/2 k= mv²/x²= 200•25²/5² = … N/m
October 17, 2012

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...
October 17, 2012

Science
speed
October 17, 2012

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