Friday
May 6, 2016

Posts by henry

Total # Posts: 11,808

physics
Wb = M*g = 12 * 9.8 = 117.6 N. = Normal force, Fn. Fx-Fk = M*a. Fx-Fk = M*0 = 0. Fk = Fx = 30 N. Fk = u*Fn. u = Fk/Fn = 30/117.6 = 0.255. Note: Since the velocity is constant, the acceleration is zero.
October 12, 2015

Physics
Xo = 96.8 mi/h * 5280Ft/mi * 1h/3600s = 142 Ft/s. Dx = Xo*Tf = 60 Ft. 142Ft/s * Tf = 60. Tf = 0.423 s. = Fall time. d = 0.5g*Tf^2 = 16*0.423^2 = 2.86 Ft., Vertically.
October 12, 2015

Physics
See related Questions: Tue, 9-2-14, 11:13 AM.
October 12, 2015

Physics
1. Dx = Xo*Tf = 8.2 m. h = 0.5g*Tf^2 = 3.3 m. 4.9*Tf^2 = 3.3. Tf^2 = 0.673. Tf = 0.821 s. = Fall time. Xo*0.821 = 8.2 m. Xo = 10.0 m/s. 2. Dx = Xo*Tf. h = 0.5g*Tf^2 = 1.6 m. 4.9*Tf^2 = 1.6. Tf^2 = 0.327. Tf = 0.571 s. Dx = 10m/s * 0.571s. = 5.71 m.
October 12, 2015

Math
60mi/h=60mi/3600s. * 1600m/mi = 26.7 m/s 10mi/h = 10/60 * 26.7 = 4.44 m/s. 500Ft. * 1m/3.3Ft = 152 m. a = (Vf-Vo)/t = (26.7-0)/7.6 = 3.51 m/s. Vf^2 = Vo^2 + 2a*d. Vo^2 = Vf^2-2a*d = 4.44 - (-8.88)*152 = 1354.2 Vo = 36.8 m/s. = Max. initial velocity for the given stopping ...
October 12, 2015

Physics
Wc = M*g = 60 * 9.8 = 588 N. = Normal force, Fn. Fk = u*Fn = 0.3 * 588 = 176.4 N. Work = Fk*d = 176.4 * 12 = 2117 J. Fap-Fk = M*a. 200-176.4 = 60*a. 60a = 23.6. a = 0.393 m/s^2. Work = M*a * d = 60*0.393 * 12 = 283 J.
October 12, 2015

applied mechanics
Incomplete.
October 12, 2015

Physics
A = 0o: Fn = Wb = 120 N. = Normal force Fn = 120-F*sin A = 0.5*120. 120-100*sin A = 60. -100*sin A = -60. sin A = 0.60. A = 36.9o.
October 11, 2015

Physics
W1*d1 = W2*d2. 45*0.6 = 60*d2. d2 = 0.45 m.
October 11, 2015

Science
F = 0.060m * 950N/m = 57 N. Work = F*d = 57 * 0.06 = 3.42 J.
October 11, 2015

science
There are too many errors in your problem. Please retype.
October 10, 2015

PHYSICS
M*g = 25 N. M*9.8 = 25. M1 = 2.55 kg. h = L*sin30 = 1 * sin30 = 0.5 m. PE = Mg*h = 25 * 0.5 = 12.5 J. at top of incline. KE = 0.5M*V1^2 = 12.5 J. at bottom of incline. 0.5*2.55*V1^2 = 12.5. 1.28V1^2 = 12.5. V1^2 = 9.8. V1 = 3.13 m/s. at bottom of incline. M2 = 40/g = 40/9.8 = ...
October 10, 2015

Physics
F1 + F2 = 19[58o] + -25+16.5i = 19*Cos58+i19*sin58 -25 + 16.5i = 10.1 + 16.1i - 25 + 16.5i=-14.9+32.6i,Q2 = 35.8N.[65.4o] N. of W. = 35.8N[144.2o] CCW.
October 10, 2015

Calculus
Also isn't there an infinite number of solutions to this equation? How are you supposed to solve it then?
October 10, 2015

Calculus
Can you show some more steps in between I can't get how to solve for y and x with only 1 equation.
October 10, 2015

Calculus
(x^2+y^2)^2=16y Find all values of x where the tangent line is vertical I found the derivative and looked for where it was undefined but it didn't work
October 10, 2015

Physics
T1*sin148 + T2*sin74 = 725 N. Eq1: 0.53T1 + 0.96T2 = 725. T1*Cos148 + T2*Cos74 = 0. Eq2: -0.85T1 + 0.28T2 = 0. -0.85T1 = -0.28T2. T1 = 0.324T2. In Eq1, Replace T1 with 0.324T2: 0.53*0.324T2 + 0.96T2 = 725. 0.172T2 + 0.96T2 = 725. 1.13T2 = 725. T2 = 640.5 N. T1 = 0.324*640.5 = ...
October 10, 2015

Calculus
what is the limit as h approaches 0 of ((x+h)^pi-x^pi)/h? Multiple choice answers: A: lnx B: lnx (x^pi) C: Pi lnx D: (pi^2) ln (x^2) E: (pi^x) lnx I know this is d/dx x^pi, or Pi x^(Pi-1)
October 10, 2015

Physics
Yf^2 = \Yo^2 + 2g*h = 0. Yo^2 = -2g*h = -2*(-9.8)*25 = 490. Yo = 22.1 m/s. a. Yf = Yo + g*Tr = 0. 22.1 - 9.8Tr = 0. Tr = 2.26 s. = Rise time. Tf = Tr = 2.26 s. = Fall time. Xo = Yo = 22.1 m/s. = Hor. velocity. Dx = Xo*(Tr+Tf) = 22.1 * 4.52 = 100 m. b. Range = Vo^2*sin(2A)/g. ...
October 10, 2015

Science
V = 1.23m/4.66*10^-8s. = 2.639*10^7 m/s.
October 9, 2015

Conversions?
1. 4106/1000 = 4.106 kilomockingbirds. 2. 10^-3 * 10^6=10^3 = 1,000 Microphones
October 9, 2015

math
Glad I could help.
October 9, 2015

math
9 yrs. ago: Valerie's age = X yrs. Jose' age = 3x yrs. The present: Valerie: (x+9) yrs. old. Jose: (3x+9) yrs. old. x+9 + 3x+9 = 78. 4x + 18 = 78. 4x = 60. X = 15 yrs. 3x+9 = 3*15 + 9 = 54 yrs. = Jose's age.
October 9, 2015

Algebra
See previous post: Fri, 10-9-15, 2:o4 PM.
October 9, 2015

Algebra
P = Po(1+r)^n. Po = $4185. r = (4.1%/4)/100% = 0.010. n = 4Comp./yr. * t yrs. = 4t Compounding periods. P = 4185(1.010)^4t = 5019. 1.010^4t = 1.19928. 4t*Log 1.010 = Log 1.19928. 4t = Log 1.19928/Log 1.010. 18.26. t = 4.57 Yrs.
October 9, 2015

Algebra
Molly's Time = 3 + 2 = 5 h.
October 9, 2015

Algebra
Molly: d1=V*t = 27 * 2 = 54 Miles head- start. d2 = d1 + 54. 45*T = 27*T + 54 18T = 54. T = 54/18 = 3 h.
October 9, 2015

Math
3/4 + 1/8 + 1/2 = 6/8 + 1/8 + 4/8 = 11/8 = 1 3/8 Glasses.
October 9, 2015

adv functions urgent
Yes, what is your question?
October 9, 2015

Physics
Vo = 36 m/s. @ What angle?. We need the angle.
October 9, 2015

business mathematics
V = Vo + Vo*r*t. V = 20,000 + 20000*(0.07/360)*75 = $20,291.67
October 9, 2015

FINANCE SIMPLE INTEREST
I = Po*r*t = 665*(0.099/365)*80
October 8, 2015

physics help
Fn = 32 N. = Normal force. Fap = 8 N. = Force applied. Fap-Fs = M*a. 8-Fs = M*0 = 0. Fs = 8 N. = Force of static friction. Fs = u*Fn = 8. u*32 = 8. u = 0.25.
October 8, 2015

MAth
(Vs - Vc)*t = 8 Miles. (15 - Vc)t = 8. Eq1: 15t - Vc*t = 8. (15 + Vc)*t = 12. Eq2: 15t + Vc*t = 12. Add Eqs #1 and #2: Sum: 30t = 20. t = 2/3 s. In Eq2, replace t with 2/3 s. and solve for Vc. Vc = 3 m/s.
October 8, 2015

physics help
Note: Co-linear forces act along the same line but not necessarily in the same direction.
October 8, 2015

physics help
F1 = -45 N. F2 = 63 N. F3 = ?. Fr = -12. Fr = F1 + F2 + F3 = -12 N. -45 + 63 + F3 = -12. 18 + F3 = -12. F3 = -30 N. = 30 N., West.
October 8, 2015

physics
X = Vw = -100 m/s. Y = Vp = 350 m/s. Q2. Vr = Sqrt(X^2 + Y^2). Tan A = Y/X = 350/-100 = -3.500. A = -74o = 74o N. of W. = 16o W. of N. = Direction. d = Vr * 3600s = Meters. Note: 3600 s = 1 hour.
October 8, 2015

Physics
Vo = 22.6 m/s[60o]. Xo = 22.6*Cos60 = 11.3 m/s. Yo = 22.6*sin60 = 19.6 m/s. Y = Yo + g*Tr = 0 @ Apex. 19.6 - 9.8*Tr = 0. Tr = 2.0 s. = Rise time or time to reach apex. Tf = Tr = 2.0 s. = Fall time. Range = Xo*(Tr+Tf) = 11.3m/s * 4s. = 45.2 m. Note: Your procedure is correct, ...
October 7, 2015

physics
The angles = 70o?. T1*sin70 + T2*sin70 = 1530 N. T1 = T2. 2T1*sin70 = 1530. T1 = 814 N. = T2.
October 7, 2015

Physics
F*d = 48 * 10.3 =
October 7, 2015

Physics
a. Fn = Mg-200*sin30. b. 200*Cos30-Fk = M*a. Fk = ?. c. u = Fk/Fn
October 7, 2015

Physics
h = Vo*t + 0.5g*t^2. h = 3.40 m/s. Vo = -2.65 m/s. g = +9.8 m/s^2. t = ?.
October 7, 2015

Finance
Correction: P1 = Po(1+r)^n.
October 7, 2015

Finance
P1 = Po(1=r)^n. Po = $100. r = 10%/100% = 0.10. n = 1Comp./yr. * 1yr. = 1 Compounding period. P1 = ?. P2 = Po(1+r)^n. Po = $.100 r = (10%/2)/100% = 0.05. n = 2Comp./yr. * 1yr. = 2 Compounding periods. P2 = ?. P3 = Po(1+r)^n. r = (10%/4)/100% = 0.025. n = 4Comp./yr. * 1yr. = 4 ...
October 7, 2015

physics
F = M*a. a = (Vf-Vo)/t. Vf = 43.7 m/s. Vo = 0.
October 7, 2015

Physics
X = Vc = 3 m/s. Y = Vb = 5 m/s. Tan A = Y/X = 5/3 = 1.66667. A = 59o N. of E. = 31o E. of N. Direction = 31o W. of N.
October 7, 2015

Physics
Fn = Mg-F*sin29.4.
October 7, 2015

algebra please help
1. 2x + 3y = 1470. 3y = -2x + 1470. Y = (-2/3)x + 490. m = -2/3, b = 490 = y-intercept.
October 6, 2015

Algebra
(-4,6), (1,1). m = (1-6)/(1-(-4)) = -5/5 = -1. Y = mx + b = 6. -1*-4 + b = 6. b = 2. Y = -x + 2.
October 6, 2015

Physics
Vo = 21 m/s. Vf = Vo + a*t = 21 + 1.6*6.8 = 31.9 m/s.
October 6, 2015

Physics
Vo = 72m/s[Ao]. Xo = 46 m/s. Xo = 72*Cos A = 46. Cos A = 46/72 = 0.63889. A = 50.3o
October 6, 2015

Physics
Vo = 24.3 m/s.[29o] Yo = 24.3*sin29 = 11.8 m/s. Yf = Yo + g*Tr = 0 at max h. 11.8 - 9.81Tr = 0. Tr = 1.20 s. = Rise time. h = Yo*Tr + 0.5g*Tr^2. g = -9.81 m/s^2.
October 6, 2015

science
Vo = 2 m/s. t = 4 s. a = 3 m/s^2. d = Vo*t + 0.5a*t^2.
October 6, 2015

math
Correction: V = 69.3 Ft/s.
October 6, 2015

math
1. h = 75 Ft ?. V = Sqrt(64*75) = Sqrt(4800) = 69.3Ft^2. 2. Sqrt(N) = N^(1/2). Curt(N) = N^(1/3).
October 6, 2015

Physics
Vo = 15 m/s?. V1 = 15 m/s. Vf = Vo + g*Tr = 0 at max h. 15 - 9.8*Tr = 0. Tr = 1.53 s. = Rise time. Tf = Tr = 1.53s. = Fall time. T = Tr+Tf = 1.53 + 1.53 = 3.06 s.
October 6, 2015

Physics
Vo = 15m/s[39o]. Yo = 15*sin39 = 9.44 m/s. Y = Yo + g*Tr = 0 @ h max. 9.44 - 9.8Tr = 0. Tr = 9.44/9.8 = 0.96 s. = Rise time. Tf = Tr = 0.96 s. = Fall time. T = Tr+Tf = 0.96 + 0.96 = 1.92 s.
October 6, 2015

physics
1. Vo = 55m/s[52o]. Xo = 55*Cos52 = 33.9 m/s. Yo = 55*sin52 = 43.3 m/s. h = Yo*t + 0.5g*t^2 = g = -9.8 m/s^2. h = ?. 2. Range = Vo^2*sin(2A)/g. Vo = 22 m/s. A = 30o. g = 9.8 m/s^2.
October 5, 2015

physics
C = C1*C2/(C1+C2) = 3*6/(3+6) = 2 uF. Ct = C + C3 = 2 + 4 = 6 uF. Total Energy = 0.5C*E^2 = 0.5*6*6^2 = 108 J.
October 5, 2015

Physics
Vf = Vo + a*t = 0. 3.08 + a*0.21 = 0. 0.21a = -3.08. a = -14.7 m/s^2. F = M*a.
October 5, 2015

Physics
Tr = 23.2/2 = 11.6 s. = Rise time. Vf = Vo + g*Tr = 0. 16 + g*11.6 = 0. 11.6g = -16. g = -1.38 m/s^2.
October 5, 2015

Physics
All angles are CCW from +x-axis. Vp + Vw = 420km/h[97o]. 420[90o] + Vw[225o] = 420[97o] 420i + Vw*Cos225+Vw*sin225 = 420*Cos97 +420*sin97 = 420i - 0.707Vw - i0.707Vw = -51.2 + 417i = -51.2 -3i. 0.707Vw (-1-1i) = -51.2 - 3i. 0.707Vw(1.41[225o]) = 51.3[183.4o]. Vw[225o] = 51.3[...
October 4, 2015

PHYSICS
X = -47.9 N. Y = 81.2 N. Q2. a. F3 = Sqrt(X^2 + Y^2) b. Tan A = Y/X = 81.2/-47.9 = -1.69520. A = -59.5o = 59.5o N. of W. Direction = 59.5o S. of E.
October 4, 2015

PHYSICS
See previous post: Sat, 8-15-15, 7:29 AM
October 4, 2015

PHYSICS
Wc = M*g. Fn = Mg*Cos15. a. Fn/Wc = Mg*Cos15/Mg = Cos15 = 0.966. b. Fn/Wc = Mg*Cos32/Mg = Cos32 = 0.848.
October 4, 2015

PHYSICS
Wb = M*g = 50.5 * 9.8 = 494.9 N. = Normal force, Fn. Fs = u*Fn = 0.624 * 494.9 = 308.8 N. = Force of static friction. Fk = 0.364 * 494.9 = 180.1 N. a. F-Fs = M*a. F-308.8 = M*0 = 0 F = 308.8 N. b. F-Fk = M*a. F-180.1 = M*0 = 0. F = 180.1 N.
October 4, 2015

physics
-16t^2 + 100t + 140 = 200. -16t^2 + 100t - 60 = 0. Divide by 4: -4t^2 + 25t - 15 = 0. Use Quadratic Formula. Solutions: T1 = 0.67 s, T2 = 5.8 s.
October 4, 2015

physics
h = 0.5g*t1^2 = 22 m. g = 9.8 m/s^2. t1 = ?. 1.4m/s * t2 = 4 m. t2 = ?. T = t1 + t2.
October 4, 2015

Physics
Vr = 120km/h[0o] + 50km/h[202o,CCW]. Vr = 120+50*Cos202 + i50*sin202 = 120 - 46.4 - 18.7i = 73.6 - 18.7i, Q4. Vr = 73.6 - 18.7i = 76[-14.2o] = 76km/h[14.2o] S. of E.
October 4, 2015

Physics
See Related Questions: Fr1, 10-17-14, 9:38 PM.
October 4, 2015

Algebra
a. Scale = 30Ft/6in = 5 Ft/in. 0r 1in = 5 Ft.
October 4, 2015

Physics
a. F = M*g = 80 * 9.8 = 784 N. b. F-784 = M*a. F-784 = 80*2 = 160. F = 944 N. c. F-784 = M*a. F-784 = M*0 = 0. F = 784 N. d. F-784 = M*a. F-784 = 80*(-1.5). F-784 = -120. F = 664 N.
October 4, 2015

Physics
Tr = 6/2 = 3 s. = Rise time. Vf = Vo + g*Tr = 0 @ max h. Vo - 9.8*3 = 0. Vo = 29.4 m/s.
October 4, 2015

Physics
1. X = 10 mi/h. Y = 80 mi/h. Vr = Sqrt(X^2 + Y^2). 2. Same Procedure as #1. 3. Vr = Vp + Vw = 80 + 10 = 90 mi/h. 4. Vr = Vp + Vw = 80 + (-10) = 70 mi/h.
October 4, 2015

Physics
Vo = 20m/s[40o]. Xo = 20*Cos40 = 15.3 m/s. Yo = 20*sin40 = 12.9 m/s. Dx = Xo*t = 15.3m/s * 2.55s. = 39 m. h = Yo*Tr + 0.5g*Tr^2 Tr = 2.55/2 = 1.275 s. = Rise time. g = -9.8 m/s^2.
October 4, 2015

physics
F = M*a = 40 * 5*9.8 = 1960 N.
October 3, 2015

PHYSICS
Fr = 3N[0o] + 4N[90o] + 12N[180o] = 3 + 4i -12 = -9 + 4i, Q2. Fr = Sqrt ((-9)^2 + 4^2)
October 3, 2015

science
See previous post: Sat, 10-3-15, 12:51 PM.
October 3, 2015

wcience
a. M*2V/M*V = 2. b. 0.5M*V/M*V = 0.5 = 1/2. c. 3M*3V/M*V = 9.
October 3, 2015

science
h = 0.5g*t^2
October 3, 2015

physical science
d = V*T = 3*10^8m/s * T = 3.5*10^5 m. T = ?.
October 2, 2015

physics
a. Yf^2 = Yo^2 + 2g*h. Yo = 0. g = 9.8 m/s^2. h = 1013 m. Yf = ?. Vf = Sqrt(Xo^2 + Yf^2), Xo = 123 m/s. b. Tan A = Yf/Xo.
October 2, 2015

Physics acceleration
Vf = 91.4mi/h * 1600m/mi * 1h/3600s. = m/s. a = (Vf-Vo)/t = m/s^2. Vo = 0. a = ?
October 1, 2015

physics
Fa+Fb = M*a = 12.3 * 0.443 = 5.45 N. Fa-Fb = 12.3 * 0.280 = 3.44 N. a. Fa + Fb = 5.45. Fa - Fb = 3.44. Sum: 2Fa = 8.89. Fa = 4.45 N. b. Fa + Fb = 5.45 4.45 + Fb = 5.45. Fb = 1.00 N.
October 1, 2015

Physics help!!
a = (Vf-Vo)/t = (-25-49)/0.0022 = -33.64 m/s^2. F = M*a. Note: The force will be negative, because it opposes the initial motion.
October 1, 2015

Physics
See previous post: Fri, 9-11-15, 12:45 PM.
October 1, 2015

physics
See Related Questions: Tue, 4-29-14, 1:34 PM.
October 1, 2015

Physics
h = 0.5g*t^2 = 0.024 m. 4.9*t^2 = 0.024. t = ? Dx = Xo^t = 50 m. Xo*t = 50. Xo = ?. 6
October 1, 2015

Physics
d1 = V1*t = 14m/s * 3.5s. = 49 m. Head-start. a. d2 = 49 + V1*t. 0.5a*t^2 = 49 + V1*t. 0.5*4*t^2 = 49 + 14*t. 2t^2-14t-49 = 0. Use Quadratic Formula. t = 9.56 s. b. d = 0.5a*t^2.
October 1, 2015

Physics
See Related Questions: Thu, 1-31-13, 2:29 AM.
October 1, 2015

physics
X = 172*Cos23. Y = 172*sin23.
October 1, 2015

physics
X = 18 * Cos13.
October 1, 2015

physics
X = 5.2 m. Y = 37.8 m. Disp. = Sqrt(X^2 + Y^2). Tan A = Y/X = 37.8/5.2 = 7.26923. A = 82.2o N. of E. = 7.8o E. of N.
October 1, 2015

physics
Incomplete.
October 1, 2015

physics
Y = 37.8 m. X = 5.2 m. Disp. = Sqrt(X^2 + Y^2) =
October 1, 2015

Pre-Algebra
(1/5)^9 = 1/5^9 = 5^-9.
October 1, 2015

conversion
2kw = 2000 W. hp = 2000/746.
October 1, 2015

conversion
20 Watts = 20 J/s.
October 1, 2015

PHYSICS
M1*V1 + M2*V2 = M1*V + M2*V. 5000*15 + 1000*(-30) = 5000V + 1000V. V = ?.
October 1, 2015

PHYSICS
Density = 100g/600cm^3 = g/cm^3.
October 1, 2015

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