Monday
July 28, 2014

Posts by Elena


Total # Posts: 4,343

Physics
ma= mg - N N=mg -ma

Physics
ma=-mg+N N=ma+mg

physics
v=v₀-at a= (v₀-v)/t s=v₀t -at²/2

physics
m•g=k•x₁ k= m•g/x₁=0.116•9.8/0.035= 32.5 N/m When the spring rises 5.7 cm =0.057 m and the spring is compressed to x₂=0.022 m F= k•x₂ =ma a =k•x₂ /m=32.5•0.022/0.116 =6.16 m/s²

Physics
ΔE=0.17 J, h=L(1-cosα) PE=KE+ΔE mgh=mv²/2 + ΔE mv² =2{mgL(1-cosα)- ΔE} T= mv²/L + mg = 2{mgL(1-cosα)- ΔE}/L +mg

physics
m•g=k•x₁ k= m•g/x₁=0.116•9.8/0.035= 32.5 N/m When the spring rises 5.7 cm =0.057 m and the spring is compressed to x₂=0.022 m F= k•x₂ =ma a =k•x₂ /m=32.5•0.022/0.116 =6.16 m/s²

Physics
(a)ma=F-F(fr) F(fr)= F-ma (b) F(fr) =μmg μ=F(fr)/mg

Physics
m=F/a

Physics
F(y) =Fsinα

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

physics
v=v₀+at v₀=0 v=at a=v/t s=at²/2

physics
ma=F(fr) =μmg a= μ•g v=v₀-at

physics
1. N1=(m(per) +m(cr))g 2. N2=m(per)g

Physics
zero V/m

Physics
Ñ=q/V= 3.3x10^-6 F

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

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•1...

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)...

physics
1. N1=(m(per) +m(cr))g 2. N2=m(per)g

physics
c. takes a short time to cool off.

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

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

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

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

Physics
m•v²/2=mgh=m•g•s•sinα v=sqrt(2• g•s•sinα)

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...

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)

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.

Physics
2Tsinα=mg T=mg/2sinα

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

Physics
T=mgsinα

Physics
F=2•F(fr)+mg =2•μ•N +mg N=(F+mg)/2• μ

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&...

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