Saturday
October 25, 2014

Posts by henry


Total # Posts: 9,352

Physics
Series circuit: P = I^2 * R The bulb with the highest resistance will receive the most power; and will, therefore, be brighter. Parallel circuit: P = V * I The lowest resistance will receive the most power and will be brighter.
September 25, 2014

Trigonometry
Circumference = pi*D = 3.14 * 4.5 = 14.13 In. = 1.1775 Ft V=15mi/h * 5280Ft/mi * 6.28Rad/1.1775Ft * 1h/3600s. = 117.3 Rad/s.
September 25, 2014

Physics
Vo = 33.7m/s[24o] Xo = 33.7*Cos24 = 28 m/s. Yo = 33.7*Sin24 = 13.7 m/s. Tr = -Yo/g = -13.7/-9.8 = 1.40 s. = Rise time. h max = -Yo^2/2g = -(13.7^2)/-19.6 = 9.58 m. Above the bldg. 0.5g*t^2 = 9.58 + 110.8 = 120.4 m 4.9*t^2 = 120.4 t^2 = 24.57 Tf = 4.96 s. = Fall time. Dx = Xo*(...
September 24, 2014

Physics
The First Object: h = Vo*t + 0.5g*t^2 = 39 m. 54.9*t - 4.9*t^2 = 39 Use Quadratic formula. t = 0.762 s. The 2nd. Object: h = Vo*t + 0.5g*t^2 = 157.9-39 = 118.9 m Vo*0.762 + 4.9*0.762^2 = 118.9 0.762Vo + 2.845 = 118.9 0.762Vo = 118.9 - 2.845 = 116.05 Vo = 152.3 m/s.
September 24, 2014

Physics
a. X = 1300 m. Y = -880 m. Tan A = Y/X = -880/1300 = -0.67692 A = -34.1o CW = 325.9o CCW. D = X/Cos A = 1300/Cos(-34.1) = 1570 m. [325.9o]. D(1300, -880). b. T = 13min * 60s/min. = 780 s. Vavg = (1300+880)m/780s. = 2.79 m/s.
September 24, 2014

Physics
Momentum = M1*V1-M2*V2 = 20*80-5*50 = 1350. M1*V + M2*V = 1350 20*V + 5*V = 1350 25V = 1350 V = 54 m/s.
September 24, 2014

physics
V = Vo + a*t = 0 Vo -0.5*8 = 0 Vo = 4 m/s. Should the distance rolled be 16 m?
September 24, 2014

Math
See previous post: Tue, 5-12-09, 9:00 PM.
September 24, 2014

system of equations
X yrs. = John's age today. 5x yrs. = John's mom's age today. 7 years from now: x+7 = John's age. 5x+7 = John's mom's age. 5x+7 = 3(x+7) 5x+7 = 3x+21 2x = 14 X = 7 Yrs. = John's age today.
September 24, 2014

physics
Vo = 53.8m/s[42o] Xo = 53.8*Cos42 = 40. m/s Yo = 53.8*Sin42 = 36.00 m/s. a. Yo*t + 0.5g*t^2 = 840 m. -36*t + 4.9t^2 = 840 4.9t^2 - 36t - 840 = 0 Use Quadratic formula and get: t = 17.3 s. = Fall time. Dx = Xo*t = 40 * 17.3 = 692 m. b. Y^2 = Yo^2 + 2g*h = 36^2 + 19.6*840 = 17,...
September 24, 2014

physics
m*g = 7 * 9.8 = 68.6 N. = Wt. of book. Fp = 68.6*sin A = Force parallel to the plank. Fn = 68.6*Cos A = Force perpendicular to the plank. Fs = u*Fn = 0.4*68.6*Cos A Fp-Fs = m*a 68.6*sin A - 0.4*68.6*Cos A = m*0 = 0 68.6*Sin A = 0.4*68.6*Cos A Sin A = 0.4*Cos A Divide both ...
September 24, 2014

Physics
Q1. a = g = -9.8 m/s^2 = 9.8 m/s^2 Downward. Q2. h = 0.5g*t^2 = 4.9*3^2 = 44.1 m.
September 23, 2014

algebra
Multiply Eq1 by 1.25 and Eq2 by 0.25 and subtract: 0.3125x + 0.1875y = 3.125 0.3125x - 0.3125y = 1.875 Diff. : 0.5Y = 1.25 Y = 2.5 In Eq1, replace y with 2.5: 0.25x + 0.15*2.5 = 2.5 0.25x = 2.5 - 0.375 = 2.125 X = 8.5
September 23, 2014

Mathematics and investment
1. P = Po(1+r)^n P = $300,000 Po = Initial investment. r = (8%/4)/100% = 0.02 = Quarterly % rate expressed as a decimal. n = 4Comp/yr. * 3yrs. = 12 Compounding periods. P = Po*(1.02)^12 = 300,000 Po = 300,000/1.02^12 = $236,547.95 2. Same procedure as #1. 3. Po = 125,000 - ...
September 23, 2014

math
3(x+2)
September 22, 2014

physics
h1 = V*t + 0.5g*t^2 = 30 m. V*1 + 4.9*1^2 = 30 V = 30 - 4.9 = 25.1 m/s h = (V^2-Vo^2)/2g + h1 h = (25.1^2-0)/19.6 + 30 = 62.14 m. = Ht. of the peak.
September 22, 2014

Math
1/2 = 3/6 1/3 = 2/6 1 = 6/6 6/6 - 3/6 - 2/6 = 1/6 = Green 1/6 * M = 7 = Green M = 42 Marbles.
September 22, 2014

Trigonometry (Math)
Tan63.33 = Y1/X = 5/X X*Tan63.33 = 5 X = 5/Tan63.33 = 2.51 m = Distance from the point of observation. Tan40.17 = Y2/X = Y2/2.51 Y2 = 2.51*Tan40.17 = 2.12 m. h = Y1+Y2 = 5 + 2.12 = 7.12 m.
September 22, 2014

physics
Xo = 17 m/s. Yo = 15 m/s. a. Tr = -Yo/g = -15/-9.8 = 1.53 s. = Rise Time. b. h = 0.5g*Tr^2 = 4.9*1.53*2 = 11.47 m. c. T = Tr+Tf = 1.53 + 1.53 = 3.06 s. d. Dx = Xo*T = 17m/s. * 3.06 = 52.02 m.
September 22, 2014

physics
a. h = 0.5g*t^2 = 310 m. 4.9t^2 = 310 t^2 = 63.27 Tf = 7.95 s. = Fall time. b. c. X = Xo = 75 m/s. Remains constant. d. Y=Yo + g*Tf = 0 + 9.8*7.95=77.95 m/s e. Dx = Xo*Tf = 75m/s * 7.95s. = 596 m. Fom drop-off point.
September 22, 2014

college physics
A. h = 0.5g*t^2 = 0.90 m. 4.9t^2 = 0.90 t^2 = 0.184 t = 0.429 s. = Fall time. B. Dx = Xo*t = 1.6 m. Xo * 0.429 = 1.6 Xo = 3.73 m/s. = Hor. component. C. Y = Yo+g*t = 0 + 9.8*0.429 = 4.20 m/s = Ver. component. V^2 = Xo^2 + Y^2 = 3.73^2 + 4.2^2=31.55 V = 5.62 m/s. D. tan A = Y/...
September 22, 2014

Math
a. Tr = -Vo/g = -87/-32 = 2.72 s. = Rise time. h=-16*2.72^2 + 87*2.72 + 550=668.3 Ft. Above gnd. b. h = 0.5g*t^2 = 668.3 Ft. 16*t^2 = 668.3 t^2 = 41.77 Tf = 6.46 s. = Fall time. Tr + Tf = 2.72 + 6.46 = 9.18 s. To reach gnd.
September 22, 2014

Math
Y = x^2 + 8x - 11 h = Xv = -B/2A = -8/2 = -4. k = Yv = (-4)^2 + 8*(-4) - 11 = -27 V(h, k) = (-4,-27) Use the following points for graphing: (x, y). (-10,9) (-7,-18) (-6,-23) (-5,-26) V(-4,-27) (-3,-26) (-2,-23) (-1,-18) (2,9). X-intercepts: X1 will be negative. X2 will be ...
September 22, 2014

Physics
(245+r)/2 = 230 km/h 245 + r = 460 r = 460-245 = 215 km/h.
September 22, 2014

Physics
Dx = Vo^2*sin(2A)/g Dx = 30^2*sin(76.4)/9.8 = 89.3 m. Dx = Vo*cos38.2 * t = 89.3 30*cos38.2 * t = 89.3 t = 89.3/30*cos38.2 = 3.79 s. = Time in air. d = 0.5a*t^2 = 8 m. 0.5*2*t^2 = 8 t^2 = 8 t = 2.83 s. = Time needed to reach landing spot. 3.79-2.83 = 0.962 s. = Waiting time.
September 21, 2014

physics
Dx = Vo^2*sin(2A)/g = 33^2*sin33.6/9.8 = 65.13 m. 65.13m/2.74 = 23.8 or 23 Busses.
September 21, 2014

science
Correction: Tr = -Vo/g = -100/-10 = 10 s.=Rise time. h1 = Vo*Tr + 0.5g*Tr^2 h1 = 100*10 - 5*10^2=500 m. Above tower. Tf = 25 - 10 = 15 s. = Fall time. h1+h2 = 0.5g*Tf^2 = 5*15^2 = 1125 m. h1+h2 = 1125 500 + h2 = 1125 h2 = 1125-500 = 625 m.=Ht. of the tower.
September 21, 2014

science
Tr=-Vo/g = -100/-9.8=10.20 s.=Rise time. d = Vo*Tr + 0.5g*Tr^2 d = 100*10.20 - 4.9*10.20^2 = 510 m Above tower. Tf = 25 - 10.20 = 14.8 s. = Fall time. h+d = 0.5g*Tf^2 = 4.9*14.8^2 = 1073 m. h + d = 1073 h + 510 = 1073 h = 1073-510 = 563 m. = Ht. of the tower
September 21, 2014

Maths
Your problem will be easier to understand if you used punctuations and capital letters at the beginning of each sentence.
September 21, 2014

physics
Fx = 18-0.53N/m * 14m = 10.58 N. a = F/m = 10.58/6 = 1.76 m/s^2. V^2 = Vo^2 + 2a*d = 0 + 2*1.76*14 = 49.4 V = 7.03 m/s.
September 20, 2014

physics
See previous post: Sat, 9-20-14, 2:48 AM
September 20, 2014

nova
7a. V^2 = Vo^2 + 2g*h Vo^2 = V^2 - 2g*h = 25^2 + 19.6*15 = 919 Vo = 30.32 m/s. 7b. h = -(Vo^2)/2g = -(30.32^2)/-19.6 = 46.9 m. 8. a = F/m = 12/6 = 2 m/s^2 V^2 = Vo^2 + 2a*d Vo = 0, a = 2 m/s^2 d = 3 m. Solve for V.
September 20, 2014

physics
h = 78 * 6 = 468 m.
September 20, 2014

physics- HELP
See previous post: Fri, 9-19-14, 3:00 AM
September 19, 2014

Math
1.---3^1 = 3 cm. 2.---3^2 = 9 cm. 3.---3^3 = 27 cm. Y = 3^x. x = The # of hours. Y = The length. Y = 3^3 = 27 cm.
September 19, 2014

Pre-Calc
F(x) = x^2 - 8x + 15 15 = (-1)*(-15 = (-3)*(-5). Choose the pair of factors whose sum = B = -8. (X-3)(X-5) = 0 x-3 = 0 X = 3. x-5 = 0 X = 5.
September 19, 2014

math
Factors of 27y^3z = 1,3,5,9,27,y,y^2. Factors of 45x^2y = 1,3.5,9,15,45,x,y. CF = 1,3,5,9,y. GCF = 9.
September 19, 2014

physics
Dx = Vo^2*sin(2A)/g = 7.04 m Vo^2*sin(37.4)/9.8 = 7.04 Solve for Vo.
September 19, 2014

physics
a. Vo = 85.3m/s[45o] Xo = 85.3*Cos45 = 60.32 m/s. Yo = 85.3*sin45 = 60.32 m/s. h = 0.5g*t^2 = 587 m. 4.9t^2 = 587 t^2 = 119.8 Tf = 10.95 s. = Fall time. Dx = Xo * Tf = 60.32m/s * 10.95s=660 m. b. Y = Yo + g*Tf = 0 + 9.8*10.95 = 107.3 m/s. Tan A = Y/Xo = 107.3/60.32 = 1.77822 A...
September 19, 2014

physics
m*g = 16.3*9.8 = 159.74 N. Fp = 159.74*sin28 = 75 N. Fn = 159.74*cos28 = 141 N. Fp-Fk = m*a 75-Fk = m*0 = 0 Fk = 75 N. KE = 0.5m*V^2 = 0.5*16.3*1.8^2=26.41 J. Fp*d = KE-Fk*d 75 * d = 26.41-75*d 75d + 75d = 26.41 150d = 26.41 d = 0.176 m.
September 19, 2014

Physics
Vo = 38km/h = 38000m/3600s = 10.56 m/s. a = (V^2-Vo^2)/2d = (0-10.56^2)/0.018m = 6195 m/s^2. F = m*a = 850 * 6195 = 5,265,920 N. Maybe we shouldn't stop it on a dime!
September 19, 2014

Physics
Dx = Vo^2*sin(2A)/g = 4.50 m. Vo^2*sin(80)/9.8 = 4.50 0.1Vo^2 = 4.50 Vo^2 = 45 Vo = 6.70 m/s[40o]. = Initial velocity.
September 18, 2014

physic
V = Vo * a*t = 29 - 2*4 = 21 m/s. d = (V^2-Vo^2)/2a = (21^2-29^2)/-4 = 100 m.
September 18, 2014

Physics
Dx = Vo^2*sin(2A)/g Dx = 23^2*sin80/9.8 =
September 18, 2014

PHYYYYYSICS 9
See previous post.
September 18, 2014

PHYYYYYSICS 8
h = 0.5g*t^2 = 40 m. 4.9t^2 = 40 t^2 = 8.16 t = 2.86 s.
September 18, 2014

PHYYYYYSICS 5
V = 56Mph[75o] - (- 40Mph[210o]) = Vb = 56[75o] + 40[210] X = 56*Cos75 + 40*Cos210 = -20.15 Mph Y = 56*sin75 + 40*sin210 = 34.1 Mph Vb^2 = (-20.15)^2 + (34.1)^2 = 1568.83 Vb = 39.6 Mph = Brian's speed.
September 18, 2014

PHYYYYYSICS 4
Vp = Vo + Vw = 71i - 23 = -23 + 71i. Tan Ar = 71/-23 = -3.08696 Ar = -72.0o S. of E. A = -72.0 + 180 = 108o CCW.
September 18, 2014

PHYYYYYSICS 3
Vo = 31.7m/s[55o] Xo = 31.7*cos55 = 18.18 m/s. Yo = 31.7*sin55 = 25.97 m/x. Dx = Vo^2*sin(2A)/g=31.7^2*sin(110)/9.8 = 96.4 m.
September 18, 2014

PHYYYYYSICS 2
Vo = 39.7m/s[55o] Yo = 39.7*sin55 = 32.52 m/s. = Vertical component. Y^2 = Yo^2 + 2g*h h = (Y^2-Yo^2)/2g = (0-(32.52^2)/-19.6 = 54 m.
September 18, 2014

PHYYYYYSICS
Vo = 28.6 m/s[20o] Xo = 28.6*Cos20 = 25.18 m/s. Yo = 28.6*sin20 = 9.78 m/s. Dx = Xo * t = 25.18m/s * 1.05s. = 26.4 m
September 18, 2014

physics
V^2 = Vo^2 + 2g*h = 0 + 40*10 = 400 V = 20 m/s. 0.5g*t^2 = 10 m. 10*t^2 = 10 t^2 = 1 t = 1 s. Or V = Vo + g*t = 20 V = 0 + 20t = 20 t = 1 s.
September 18, 2014

physics
Where are the tables?
September 18, 2014

physical science
r = 100m/10.79s. = 9.27 m/s.
September 18, 2014

physical science
Superfly: Mass = 1*10^-3 kg V = 840*10^6km/h = 840*10^9m/3600s. = 2.333*10^8 m/s. Momentum = M*V = 1*10^-3 * 2.33*10^8 = 2.33*10^5. Locomotive: Mass = 20,000kg V = 40km/h = 40,000m/3600s = 11.11 m/s. Momentum = M*V = 2.*10^4 * 11.11 = 2.22*10^5. Superfly has the greater ...
September 18, 2014

physics
(Vs-Vw)t1 = 750 m. (1.10-0.4)t = 750 0.7t1 = 750 t = 1071.4 s. = 17.9 min. = Time to swim upstream. (1.10+0.4)t2 = 750 m. 1.5t2 = 750 t2 = 500 s. = 8.33 min. = Time to swim downstream. t1+t2 = 17.9 + 8.33 = 26.2 min. = Time to swim upstream and back. t3 = d/V = (750+750)/1.1...
September 16, 2014

science
1a. F2*d2 = F1*d1 100*d2 = 300*0.5 = 150 d2 = 1.5 m. 1b. 150*d2 = 300*0.5 = 150 d2 = 1.0 m.
September 16, 2014

Physics
All angles are CCW. 459km/h[140o] + Vw = 498km/[156o] Vw = 498[156] - 459[140] X = 498*Cos156 - 459*Cos140 =-103.3 km/h Y = 498*sin156 - 459*sin140 = -92.48km/h Tan Ar = Y/X = -92.48/-103.3 = 0.89530 Ar = 41.84o = Reference angle. A = 41.84 + 180 = 221.84o CCW = 41.84o S. of W...
September 16, 2014

physics
Vo = 500m/s[30o] Xo = 500*cos30 = 433 m/s. Yo = 500*sin30 = 250 m/s. Tr = -Yo/g = -250/-9.8 = 25.5 s. = Rise time. Tf = Tr = 25.5 s. = Fall time. Tr+Tf = 25.5 + 25.5 = 51 s. = Time in air. Dx = Xo*(Tr+Tf) = 433*51 = 22,083 m. = Distance travelled by the shell. D = Dx + Dt = 22...
September 16, 2014

physics
Fap-Fk = m*a 350-Fk = 38*7.3 = 277.4 -Fk = 277.4-350 = -72.6 Fk = 72.6 N. = Force of kinetic friction.
September 15, 2014

Phsics
Incomplete.
September 15, 2014

math
V=6-60=-54 Mi/h = -54Mi/h * 1600m/Mi * 1h/3600s = -24 m/s = 24 m/s Due South.
September 15, 2014

math
h = 1.9 m. Dx = 30 m. h = 0.5g*t^2 = 1.9 m. 4.9t^2 = 1.9 t^2 = 0.388 Tf = 0.623 s. = Fall time. Dx = Xo * Tf = 30 Xo * 0.623 = 30 Xo = 48.2 m/s. = Initial speed.
September 15, 2014

Physics
F = m*a = 15 * 0.7 = 10.5 N. Work = F*d = 10.5 * 12 = 126 Joules.
September 15, 2014

Physics
V = Vo + a*t t = (V-Vo)/a = t = (5.37*10^5-2.24*10^5)/2.2*10^14 = 3.13*10^5/2.2*10^14 = 1.42*10^-9 s.
September 15, 2014

physics
Incomplete.
September 15, 2014

physics
Xo = 26.4 m/s. Dx = 18.4 m. Tf = Fall time. Dx = Xo*Tf = 26.4 * Tf = 18.4 m. Tf = 0.697 s. h = 0.5g*Tf^2 = 4.9*0.697^2 = 2.38 m.
September 15, 2014

physics
Vo = 36m/s[24o] Xo = 36*cos24 = 32.9 m/s. Yo = 36*sin24 = 14.64 m/s. h = (Y^2-Yo^2)/2g = (0-(14.64^2))/-19.6 = 10.94 m.
September 15, 2014

physics
Xo = 25 m/s. d = 50 m Tf = Fall time. d = Xo*Tf = 25 * Tf = 50 m Tf = 2 s. h = 0.5g*Tf^2 = 4.9*2^2 = 19.6 m.
September 15, 2014

physics
h = 0.5g*t^2 = 1.9 4.9t^2 = 1.9 t^2 = 0.388 Tf = 0.623 s. = Fall time. D = Xo*Tf = 4.9m/s * 0.623s = 3.05 m.
September 15, 2014

physics
F = 365N[228o]CCW+224N[334o]CCW+488N [102o]CCW. Fx=365*Cos228 + 224*Cos334 + 488*cos102 = -144.4 N. Fy=365*sin228 + 224*sin334 + 488*sin102 = 107.9 N. Tan Ar = Fy/Fx = 107.9/-144.4 = -0.74718 Ar = -36.8o = Reference angle. A = -36.8 + 180 = 143.2o CCW = 36.8o N. of W. F = Fx/...
September 15, 2014

physics
a. d = 110-Vo*t = 110 - 20*0.7 = 96 m. b. a = (V^2-Vo^2)/2d = (0-20^2)/192 = -2.08 m/s^2. c. V = Vo + a*t = 0 t = -Vo/a = -20/-2.08 = 9.60 s.
September 15, 2014

Physics
a. h = ho+(V^2-Vo^2)/2g=(0-(5^2))/-19.6 =2.78 m. No. b. V^2 = Vo^2 + 2g*h Vo^2 = V^2-2g*h = 0 + 19.6*3.95 Vo^2 = 77.42 Vo = 8.8 m/s. c. V^2 = Vo^2+2g*h = 5^2 + 19.6*3.95 = 102.42 V = 10.12 m/s. Change = 10.12-5 = 5.12 m/s.
September 15, 2014

Math
In how many arrangements of the letters BERKELEY are all three E's adjacent? I think its (5!)*(6) i'm looking for some clarification.
September 14, 2014

physics
a. Tan A = 48/77 = 0.62338 A = 31.94o Tan31.94 = Vc/1.2 Vc = 1.2*Tan31.94 = 0.748 m/s = Speed of the current. b. Vs = 1.2/Cos31.94 = 1.414 m/s = Speed of swimmer. c. The current shifted the swimmer 31.94o E. of the desired point. To offset the affect of the current, the ...
September 10, 2014

physics
Vp + Vw = 314i Vp + 71 = 314i Vp = -71 + 314i Tan Ar = 314/-71 = -4.42254 Ar = -77.26o = Reference angle. A = -77.26 + 180 = 102.74o CCW = 12.74o W. of N.
September 10, 2014

Physics
(Vs-Vc)t1 = 208 km. (Vs+Vc)t2 = 208 km. Vs*t1-Vc*t1 = 208 Vs*t2+Vc*t2 = 208 Eq1: 21.7Vs - 21.7Vc = 208 Eq2: 20.3Vs + 20.3Vc = 208 Multiply Eq1 by 20.3 and Eq2 by 21.7 and add the Eqs: 440.51Vs - 440.51Vc = 4222.4 440.51Vs + 440.51Vc = 4513.6 Sum: 881.02Vs = 8736 Vs = 9.92 km/h...
September 10, 2014

physics
Vp + Vw = -226 m/s. Vp + 32i = -226 Vp = -226 - 32i Tan Ar = -32/-226 = 0.14159 Ar = 8.06o = Reference angle. A = 8.06 + 180 = 188.06o,Q3. = 8.06o S. of W. = Direction.
September 10, 2014

math
Incomplete.
September 10, 2014

Physics
Dx = Xo*T = 10.18 * 3.30 = 33.6 m. h = (Y^2-Yo^2)/2g h = (-15.13)^2-(17.21^2)/-19.6 = ( 228.92-296.18)/-19.6 = 3.43 m. = Y.
September 10, 2014

Physics
Vo = 20m/s[59.4o] Xo = 20*cos59.4 = 10.18 m/s. Yo = 20*sin59.4 = 17.21 m/s. X = Xo = 10.18 m/s. Does not change. Y = Yo+g*t = 17.21 - 9.8*3.30=-15.13 m/s Downward.
September 10, 2014

science
Volume.
September 10, 2014

algebra
13h/0.5mi. = 26 h/mi. with new machine. d1 = 2h * 1mi/26h = 2/26= 1/13 Mi. by new machine. d2 = 13/26 - 2/26 = 11/26 mi. remaining. 15h/0.5mi. = 30 h/mi. with old machine. T = (11/26)mi * 30h/mi = 12.69 h.
September 10, 2014

algebra
X oz. @ $3.50/oz. (30-X) oz. @ $7.00/oz. 3.50x + 7.00(30-x) = 6.30*30 3.5x + 210 - 7x = 189 -3.5x = 189 - 210 = -21 X = 6 oz. @ 3.50/oz. 30-X = 30-6 = 24 oz. @ $7.00/oz.
September 10, 2014

algebra
Invested $X @ 4%. Invested $(14,000-X) @ 2.5%. 0.04X + 0.025(14000-X) = $458. Solve for X.
September 10, 2014

physics
h = 0.5g*t^2 = 1.19 m. 4.9t^2 = 1.19 t^2 = 0.243 Tf = 0.493 s. = Fall time. Tr = Tf = 0.493 s. = Rise time. Tr+Tf = 0.493 + 0.493 = 0.986 s. = Time in air.
September 10, 2014

Trig
We draw 2 rt. triangles with a common ver. side: 1. Draw a hor. line with points A, B, C. AB = 25Ft, BC = X Ft. 2. Draw ver. line CD and label it h. 3. Draw AD which makes a 44o angle with AC. Draw BD which forms a 65o angle with BC. Tan65 = h/X h = X*Tan65 = 2.14X Tan44 = h/(...
September 10, 2014

Math Problem (please help)
a. d = (120N/265N) * 0.15m b. (F/265) * 0.15 = 0.30 0.15F = 79.5 F = 530 N.
September 10, 2014

physics
1. Vo = a*t = 2.59 * 19 = 49.21 m/s. d1 = 0.5a*t^2 = 0.5*2.59*19^2 = 467.5 m. 2. d2 = Vo*t = 49.21 * (2.15*60)=6348 m. 3. V = a*t = -9.08 * 5.42 = -49.21 m/s. V-Vo = 49.21-49.21 = 0 = Final velocity. d3 = (Vf^2-Vo^2)/2g. Vf = 0 d3 = -(Vo^2)/2g = -(49.21^2)/-19.6 = 124 m. a. D...
September 10, 2014

physics
Vo = a*t = 28 * 9.5 = 266 m/s. ho = 0.5a*t^2 = 14*9.5^2 = 1264 m. h = ho + (V^2-Vo^2)/2g h = 1264 + (0-(266^2)/-19.6 = 4874 m. = 4.874 km.
September 10, 2014

physics
Tr = 3.70s/2 = 3.85 s. = Rise time. Tr = -Vo/g = 3.85 s. -Vo/-9.8 = 3.85 -Vo = -37.73 Vo = 37.73 m/s.
September 10, 2014

physics
1st Stone: 4.9t^2 = 49 t^2 = 10 Tf = 3.16 s. = Fall time. 2nd stone: h = Vo*t + 0.5g*t^2 = 49 t = 3.16-1 = 2.16 s. = Fall time. Vo*2.16 + 4.9*2.16^2 = 49 2.16Vo + 22.86 = 49 2.16Vo = 49-22.86 = 26.14 Vo = 12.1 m/s. = Initial velocity.
September 10, 2014

Physics
Fp = mg*sin30 = Force parallel to the incline. a = Fp/m = mg*sin30/m = g*sin30 = 9.8*0.5 = 4.9 m/s^2.
September 10, 2014

Physics
a. Vo = 12m/s[8o] Xo = 12*cos8 = 11.88 m/s. Yo = 12*sin8 = 1.67 m/s. Tr = -Yo/g = -1.67/-9.8 = 0.170 s. = Rise time. h = ho + (Y^2-Yo^2)/2g h = 1.67 + (0-(1.67^2))/-19.6 = 1.74 m. Above gnd. d = 0.5g*t^2 = 1.74-1.0 4.9*t^2 = 0.74 t^2 = 0.151 Tf = 0.389 s. = Fall time. Dx = Xo...
September 10, 2014

physics
m*g = 120kg * 9.8N/kg = 1176 N. = Wt. of the bed. Fp = 1176*sin37 = 707.73 N. = Force parallel to the incline. Fn = 1176*cos37 = 939.20 N. = Normal = Force perpendicular to the incline. Fap-Fp = m*a Fap-707.73 = m*0 = 0 Fap = 707.73 N. = Force applied parallel to the incline. ...
September 10, 2014

engineering science
m*g = 60 N. = Wt. of object. Fp = 60*sin17.5 = 18.04 N. = Force parallel to the incline. Fn = 60*cos17.5 = 57.22 N. = Normal = force perpendicular to the incline. Fap-Fp-Fs = m*a 44-18.04-Fs = m*0 = 0 Fs = 44-18.04 = 26 N. = Force of static friction.
September 10, 2014

physics
h = 4000*sin3 Dx = 3000 + 4000*cos3
September 9, 2014

physics
Va*t + Vb*t = Da + Db. 8.4t + 7.1t = 5.3 + 4.5 15.5t = 9.8 t = 0.63226 h = Time at which their paths cross. d = 4.5 - 7.1*0.63226 = 4.5 - 4.489 = 0.01097 km = 11 m. East of flagpole.
September 9, 2014

Physics
V = Vo + a*t = 16 m/s. 0 + 2.8*t = 16 t1 = 5.71 s. to reach 16 m/s. d1 = 0.5a*t^2 = 0.5*2.8*5.71^2 = 45.65 m d2 = V*t2 = 16 * 16 = 256 m. t1+t2+t3 = 5.71 + 16 + 3.6 = 25.31 s in motion. V = Vo + a*t = 0 16 + a*3.6 = 0 3.6a = -16 a = -4.44 m/s^2. d3 = (V^2-V0^2)/2a = (0-(16^2...
September 9, 2014

college algebra
The procedure is the same except the inequality sign is reversed when multiplying or dividing by a negative number.
September 9, 2014

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Search
Members