Wednesday
September 17, 2014

Posts by henry


Total # Posts: 9,077

physics
V^2 = Vo^2 + 2a*h V^2 = 51.3^2 + 3.64*150 = 3177.69 V = 56.4 m/s. hmax = (V^2-Vo^2)/2g hmax = (0-56.4^2)/-19.6 = 162,3 m.
September 19, 2013

physics
a. Vo = 14m/s[45o] Xo = 14*cos45 = 9.9 m/s. Yo = 14*sin45 = 9.9 m/s. Y = Yo + g*t = 0 Tr=Yo/g = 9.9/9.8 = 1.01 s. = Rise time. hmax = ho + Yo*t + 0.5g*t^2 hmax=2.16 + 9.9*1.01 - 4.9*1.01^2=7.16m Above gnd. h = 0.5g*t^2 = 7.16 4.9t^2 = 7.16 t^2 = 1.46 Tf = 1.21 s. = Fall time. ...
September 19, 2013

Physics
2.80km[35o] X = 2.80*cos35 = 2.29 km Y = 2.80*sin35 = 1.61 km dmin = 2.29 + 1.61 = 3.9 km
September 19, 2013

Physics
1. Check calculations and have another person check it also. 2. Check Power supply voltage. 3. Remove all resistors from circuit and check them individually. 4. Make sure circuit is wired correctly.
September 19, 2013

business math
80 * 3.50 =
September 19, 2013

business math
0.75*P = 2484 P = $3312.
September 19, 2013

Physics
h = 0.5g*t1^2 = 20 m. 4.9*t1^2 = 20 t1^2 = 4.08 t1 = 2.02 s. d = r * t2 = 4.6 m. 1.6t2 = 4.6 t2 = 2.9 s. T = t1 + t2 = 2.02 + 2.9 = 4.92 s.
September 19, 2013

Physics
Vr = -10 + 20 = 10 km, East.
September 18, 2013

physics
See previous post.
September 18, 2013

physics
h1 = Vo*t + 0.5g*t^2 h1 = 16*0.65 - 4.9*0.65^2 = 8.33 m. Head start. V1 = Vo + g*t = 16 - 9.8*0.65=9.63 m/s. h2 = Vo*t + 0.5g*t^2=8.33+V1*t+0.5g*t^2 27*t - 4.9t^2 = 8.33 + 9.63t - 4.9t^2 27t - 9.63t - 4.9t^2 + 4.9t^2 = 8.33 17.37t = 8.33 t = 0.48 s. h = 27*0.48 - 4.9*0.48^2 = ...
September 18, 2013

Math term definitions
See your previous post.
September 18, 2013

physics
m*g = 15,400 N. m = 15400/g = 15400/9.8 = 1540.4 kg Fr = -2000 + 4000[120o] X = -2000 + 4000*cos120 = -4000 N. Y = 4000*sin120 = 3464 N. tan Ar = Y/X = 3464/-4000 = -0.86603 Ar = -40.9o = Reference angle. A = -40.9 + 180 = 139.1o CCW = 49.1o W. of N. Fr = Y/sinA = 3464/sin139...
September 18, 2013

Math Definitions
See previous post.
September 18, 2013

Math Please Urgent
See your previous post: Wed,9-18-13,8:04 PM.
September 18, 2013

Math definitions
1. A perfect cube. Example: 125 = 5*5*5. 2. A perfect square. Example: 36 = 6*6. 3. 1*sqrt (4) 4. 8*sqrt(4)
September 18, 2013

Math
((1/4)^-3/(1/4)^2)^-2 = ((1/4)^-5)^-2 = (1/4)^10 = 9.54*10^-7 (3^1/2)^3 = 3^(3/2) = 5.196. -56r^2/-7r^2 = 8. x*y*x*2y = 2X^2Y^2 3600X^4Y^6. sqrt(16*10^4) = 4*10^2 = 400. sqrt means Square root. sqrt(0.04) = sqrt(4*10^-2) = 2*10^-1 = 0.20 3*sqrt(81) = 3*9 = 27 sqrt(900) = sqrt(...
September 18, 2013

Physics
F = m*a
September 18, 2013

physics
a. d = Xo * t = 2.75m/s * 0.866s=2.38 m. b, d=0.5g*t^2 = 4.9*(0.866)^2 = 3.67 m. c. d = 0.5g*t^2 = 10 m. 4.9t^2 = 10 t^2 = 2.04 Tf = 1.428 s. = Fall time. D = Xo * Tf = 2.75 * 1.428 = 3.93 m.
September 18, 2013

pressure
To = (2.7/1.75) * 25C = 38.57oC
September 18, 2013

Physics
h = 0.5g*t^2 = 44 m. 4.9t^2 = 44 t^2 = 8.98 t = 3 s. = Time in flight. Range = Vo*cos10 * t = 109 m. Vo*cos10 * 3 = 109 Vo = 109/3*cos10 = 36.9 m/s[10o]
September 18, 2013

Business Math
I = 2600-2000 = $600 I = Po*(0.06/360)*t = 600 2000*(0.06/360)*t = 600 0.333t = 600 t = 1800 Days = 5 yrs(Assuming 360 days/yr)
September 18, 2013

physics
See previous post.
September 18, 2013

physics
Xo = 75 m/s. Y^2 = Yo^2 + 2g*h Y^2 = 0 + 19.6*50 = 980 Y = 31.3 m/s. V = 75 + 31.3i tan A = Y/Xo = 31.3/75 = 0.41740 A = 22.7o
September 18, 2013

physics
I = 10*Log 105 = 20.2 db.
September 18, 2013

math
N(-2,-3), O(0,0), P(6,p). m1 = (0-(-3))/(0-(-2)) = 3/2 m2 = (p-0)/(6-0) = 3/2 p/6 = 3/2 2p = 18 p = 9.
September 18, 2013

Physics
d = 0.5a*t^2 = 2.5*3.9^2 = 38 m.
September 18, 2013

Physics
See previous post.
September 18, 2013

Physics
P = V^2/R = 120^2/15 = 960 Watts. Energy = P * t = 960 * 60s = 57,600 Watt-seconds.
September 18, 2013

Physics
Correction: R + 11=(11A/6.6A)*R= 1.666R.
September 18, 2013

Physics
R + 11 = (11A/6.6A)R 1.666R 1.666R - 1R = 11 0.666R = 11 R = 16.5 Ohms. = Original Resistance.
September 18, 2013

Physics
h1=a*t^2 = 28.3*5.5^2=856.1 m Above gnd. V1 = a*t = 28.3 * 5.5 = 155.7 m/s. V = V1 + g*t = 0 155.7 - 9.8t = 0 -9.8t = -155.7 t = 15.9 s. To reach max ht. h2 = V1*t + 0.5g*t^2 h2 = 155.7*15.9 - 4.9*15.9^2 = 1236 m Above h1. h = h1 + h2 = 856 + 1236 = 2092 m. Above gnd.
September 17, 2013

12
cot E = -9/12 = X/Y. r^2 = X^2 + Y^2 = (-9)^2 + 12^2 = 225 r = 15 sin E = Y/r = 12/15.
September 17, 2013

Physics
D = 9.6-2.59i D^2 = 9.6^2 + (-2.59)^2 = 98.89 D = 9.94 m. tan A = Y/X = -2.59/9.6 = -.26979 A = -15.1o = 15.1o S of E.
September 17, 2013

Physics
h = 0.5g*t^2 = 4.9*1.7^2 = 14.2 m.
September 17, 2013

finance
P = Po(1+r)^n. P = 1000(1.02)^n = 2000 1.02^n = 2 n*Log 1.02 = Log 2 n = Log 2/Log 1.02 = 35 Compounding periods. 35Comp / 1Comp/yr = 35 Yrs. To double.
September 17, 2013

algebra 2
1. $40/7.50 = 5.33 Or 5 tickets. 2. $40/7.50 = 8 Tickets.
September 17, 2013

math
N - 0.25N = sqrt(576) = 24 = Length of each side of the square. 0.75N = 24 N = 32 = Length of long sides of rectangle. A = L * W = 32 * 24 = 768 = Area of rectangle.
September 17, 2013

Geometry
Radius of R = r units. Radius of Q = (4/5)*r = 4r/5 units. Ar/Aq = pi*r^2/pi*(4r/5)^2 Ar/Aq = r^2/(4r/5)^2 = r^2/(16r^2/25) Ar/Aq = r^2*25/16r^2 25/16 = 25/16 = 1.5625 = 156.25% Ar = 156.25% - 100% = 56.25% > Aq.
September 17, 2013

physics
See previous post: Tue,9-17-13,6:20PM.
September 17, 2013

physical science
V = (575/950) * 1*10^6 =
September 17, 2013

math
r1*t + r2*t = 3 Mi. 4t + 5t = 3 9t = 3 t = 3/9 = 1/3 h. = 20 min.
September 17, 2013

physics
d = Xo * t d = 327*cos37.2 * 7.83 =
September 17, 2013

PHYSICS
D = 5.2i - 3.6 - 2.6i = -3.6+2.6i D^2 = -3.6^2 + 2.6^2 = 19.72 D = 4.44 km.
September 17, 2013

Physics
V^2 = Vo^2 + 2g*d Vo^2 = V^2 - 2g*d Vo^2 = 10^2 - (-19.6)98*5 Vo^2 = 100 + 98 = 198 Vo = 14.1 m/s. = Speed at which ball was thrown.
September 17, 2013

Physics
Xo = 12.2 m/s. Range = 21 m. Range = Xo * Tf = 21 m. 12.2 Tf = 21 Tf = 1.72 = Fall time. h = 0.5g*Tf^2 = 4.9 * 1.72^2 = 14.5 m.
September 17, 2013

Physics
d = 0.5g*t^2 = 490 m 0.5g*10^2 = 490 0.5g*100 = 490 100g = 980 g = 9.8 m/s^2.
September 17, 2013

finance
See previous post.
September 16, 2013

finance
P = Po(1+r)^n r = (2%/365)/100% = 0.00005479 = Daily % rate expressed as a decimal. n = 365Comp./yr * 20yrs. = 7300 Compounding periods. P = !000(1.00005479)^7300 = $1491.76
September 16, 2013

physics
a. Speed=1mi/4min * 1min/60s * 3600s/h = 15 mi/h. b. S=15mi/h * 5280Ft/mi * 1h/3600s = 22 Ft./s. c. S = 15mi/h * 1600m/mi * 1h/3600s=
September 16, 2013

Physics
h = 117*sin 31 = 60.26 m. V^2 = Vo^2 + 2g*h V^2 = 0 + 19.6*60.26 = 1181.09 V = 34.37 m/s
September 16, 2013

Physics
d = 0.5a*t^2 = 200 m. 2*t^2 = 200 t^2 = 100 t = 10 s.
September 16, 2013

Physics
Wt. = m*g = 69kg * 9.8N/kg = 676.2 N. F1 = 676.2*sin47 = 494.54 N. = Force parallel to the slope. F2 = 676.2*cos47 = 461.2 N. = Force perpendicular to the slope. 160-Fs = = m*a 160-u*F2 = m*0 = 0 u*461.2 = 160 u = 0.35 = Coefficient of static friction.
September 16, 2013

Physics
d1 = (9.5+0.9)t1 = 300 t1 = 300/(9.5+0.9) = d2 = (9.5-0.9)t2 = 300 t2 = 300/(9.5-0.9) = T = t1 + t2
September 16, 2013

math
d1 = 50mi/h * 1h + 50mi/h * 4h = 250 mi d2 = r*t = 250 mi r*4 = 250 r = 62.5 mi/h = Wife's speed.
September 16, 2013

Physics
a. D = -2 + 5i + 8 = 6 + 5i. D2 = 6^2 + 5^2 = 61 D = 7.81 Blocks. b. ta A = Y/X = 5/6 = 0.83333 A = 39.8o
September 16, 2013

Physics
V = Vo + a*t = o 9.6 + (-5.1)t = 0 -5.1t = -9.6 t = 1.88 s.
September 16, 2013

Math
6. 4 + 2(13-4)/3^2 = 4 + 2(9)/9 = 4 + 2 = 6.
September 16, 2013

math
a. TILE: L = 1/3 Ft. BOARD: L = 1/4 Yd. = 3/4 Ft. RATIO = (1/3)/(3/4) = 1/3 * 4/3 = 4/9. b. At = L*W = 1/3 * 1/3 = 1/9 Ft^2 Ab = 3/4 * 3/4 = 9/16 Ft^2. At/Ab = (1/9)/(9/16) = 1/9 * 16/9=16/81.
September 16, 2013

Physics
19t + 0.5a*t^2 = 49t + 49*0.6 19t + 0.5*6*t^2 = 49t + 29.4 3t^2 - 30t - 29.4 = 0 t = 10.9 s.
September 16, 2013

physics
a = (V^2-Vo^2)/2d a = (5.5^2-8^2)/14.8 = -2.28 m/s^2.
September 16, 2013

Physics
D = 1.2m/s * 10min *60s/min = 720 m.
September 16, 2013

Math
a. I = Po*r*t I=40,000*(0.13/365days)*160days = $2279.45 b. 40,000 + 2279.45 = $42,279.45 c. October 30.
September 16, 2013

Algebra 2
a. R = 0.00829s^2 = 5Lbs s^2 = 603.14 s = 24.6 mi/h. b. R = 0.008299*(2s)^2 = 4*0.00829s^2 The resistance increases by a factor of 4.
September 15, 2013

Physics
Vo = 9.4m/s[23o] Xo = 9.4*cos23 = 8.65 m/s. Yo = 9.4*sin23 = 3.67 m/s. c. X = Xo * t = 8.65t Y = Yo*t + 0.5g*t^2=3.67t+4.9t^2 e. h = 3.67t + 4.9t^2 h = Y = 3.67*6 + 4.9*6^2 = 198.4 m. Above gnd. f. 3.67t + 4.9t^2 = 10 m. 4.9t^2 + 3,67t _- 10 = 0 t = 1.10 s. (Use Quad. Formula).
September 15, 2013

physics
a. P = V^2/R = 24W. 120^2/R = 24 R = 600 Ohms. .
September 15, 2013

Physics
D=3.96m[90o] + 2.06m[45o] + 1.13m[240o] X=3.96*cos90+2.06*cos45+1.13*cos240 =0.892 m. Y = 3.96*sin90+2.06*sin45+1.13*sin240 = 4.44 m. tan A = Y/X = 4.44/0.892 = 4.98 A = 78.6o D = X/cos A = 0.892/cos78.6 = 4.51 m @ 78.6o N of E.
September 15, 2013

algebra
What does the "a" mean?
September 15, 2013

Physics
F = m*g = 30 N. 120*g = 30 g = 0.25 m/s^2
September 15, 2013

Physics
V^2 = Vo^2 + 2a.d a = (V^2-Vo^2)/2d a = (0-1.57^2)/2(6.25-1.83)=-0.279 m/s^2 Vo^2 = V^2-2a*d Vo^2= 0-2*(-0.279)*6.25 = 3.49 Vo = 1.87 m/s. Required.
September 15, 2013

Physics
Correction: hi/h2 = 4.9*(2t)^2/4.9*t^2 h1/h2 = 4.9*4*t^2/4.9*t^2 = 4.
September 15, 2013

Physics
h1/h2 = 4.9*(2t^2)/4.9*t^2 h1/h2 = 4.9*4*t^2/4.9t^2= 4.
September 15, 2013

physics
See Related Questions: Sat,9-14-13,1:23 PM.
September 15, 2013

Physical Science
d = V * t = 381*10^6 m. 11,000 * t = 381*10^6. Solve for t.
September 15, 2013

physics
c. ER2/(R1+R2)
September 15, 2013

Mechanics
20in *0.0254m/in = 0.5084 m. P = F * d/T = mg * d/T P = 200*9.8 * 0.5084/60 = 16.6 J/s = 16.6 Watts. P = (16.6/746) * 1 hp = 0.0223 hp.
September 15, 2013

Algebra
Test Average = (72+80+65+78+60)/5 = 71 Test Points = 2/3 * 71 = 47.33 47.33 + S/3 = 76 142 + S = 228 S = 86 = Final Exam score.
September 14, 2013

Math Homework HELP!
(k,-8), (-3.-5). (9,7), (12,5). m1 = m2 = (5-7)/(12-9) = -2/3. m1 = (-5-(-8))/(-3-k) = -2/3 (-5+8)/(-3-k) = -2/3 3/(-3-k) = -2/3 6+2k = 9 2k = 3 k = 3/2.
September 14, 2013

physics
a=(V-Vo)/t=(13.9-16.90)/3.5=-0.769m/s^2 V = Vo _ a*t V = 13.9- 0.769*2 = 12.4 m/s.
September 14, 2013

physics
d2 = d1 + 26 m. r2*t = r1*t + 26 6t = 4.2t + 26 1.8t = 26 t = 14.44 s. d = d1 = 4.2*14.44 = 60.67 m..
September 14, 2013

Math
(1,4),(3,5). Slope = (5-4)/(3-1) = 1/2 (1,4). Y = mx + b = 4 (1/2)*1 + b = 4 b = 7/2 Eq: Y = x/2 + 7/2.
September 13, 2013

physics
CORRECTION: Change 2.31 io 2.51 m. Vo^2 = 49.2 Vo = 7.01 m/s, Up ward. a = (-7.01-9.2)/12.6 = -1.29 m/s^2.
September 12, 2013

physics
V1^2 = Vo^2 + 2g*d V1^2 = 0 + 19.6*4.31 = 84.48 V1 = 9.2 m/s. V^2 = Vo^2 + 2g*d = 0 Vo^2 + (-19.6)*2.31 = 0 Vo^2 = 45.3 Vo = 6.73 m/s. a =(Vo-V1)/t a=(6.73-9.2)/12,6=-0.196m/s^2
September 12, 2013

physics
a. d = Vo*t + 0.5g*t^2 = 98 m. 0 + 4.9t^2 = 98 t^2 = 20 Tf = 4.47 = Fall time. V = Vo + g*t = 0 + 9.8*4.47 = 43.8 m/s.= Velocity @ 98 m. b. d = Vo*t + 0.5g*t^2 = 98 m. 43.8*t + 4.9t^2 = 98 4.9t^2 + 43.8t - 98 = 0 Tf = 1.85 s.
September 12, 2013

physics
Correction: d1=0.5g*t^2=4.9*1.14^2=6.37 m Head start. V = Vo + g*t = 0 + 9.8*1.14=11.17m/s. = Velocity after falling 6.37 m. h1 = Vo*t + 0.5g.t^2 =45.4-6.37 11.17t + 4.9t^2 = 39 4.9t^2 + 11.17t - 39 = 0 Tf = 1.9 s. = Fall time of both stones. h2 = Vo*t + 0.5g*t^2 = 45.4 1.9Vo...
September 12, 2013

physics
d1 = 0.5g*t^2 = 4.9*1.14^2 = 6.37 m. head start. h = 0.5g*t^2 = 45.4 m. 4.9t^2 = 45.4 t^2 = 9.27 Tf = 3.04 s. = Fall time of both stones d2 = d1+ 6.37 m. Vo*t + 0.5g*t^2 = 0.5g*t^2 + 6.37 Vo*t + 0.5g*t^2 -0.5g*t^2 = 6.37 Vo*t = 6.37 Vo*3.04 = 6.37 Vo = 2.09 m/s. NOTE: The 2 ...
September 12, 2013

Physics
h = Vo*t + 0.5g*t^2 = 9.14 m. -2.27t + 4.9*t^2 = 9.14 4.9t^2 - 2.27t = 9.14 4.9t^2 - 2.27t - 9.14 = 0 t = 1.617 s. (Use Quad. Formula) NOTE: The initial velocity is negative, because its' movement is in a direction opposite to the falling object.
September 10, 2013

Pre-calc
Incomplete.
September 10, 2013

physics
Vo = 20.1m/2[36.4o] Xo = 20.1*cos36.4o = 16.18 m/s. Yo = 20.1*sin36.4o = 11.93 m/s. Y = Yo + g*t = 0 @ max. ht. 11.93 + (-9.8)*t = 0 -9.8t = -11.93 Tr = 1.22 s. = Rise time. d = Xo * Tr = 16.18m/s * 1.22s = 19.7 m.
September 10, 2013

physics
D = 29km[153o] - 42km[143o] a. X = 29*cos153 - 42*cos143 = 7.70 km. Y = 29*sin153 - 42*sin143 = -12.1 km. D^=X^2 + Y^2 = 7.7^2 + (-12.1)^2=205.94 D = 14.35 km. = The dist. between the 2 teams. b. tan A = Y/X = -12.1/7.70 -1.57142857 A = -57.53o = 57.53o South of East.
September 10, 2013

Physics
V = Vo +a*t = 18.1 m/s. 0 + 3*t = 18.1 t1 = 6.03 s. t2 = 24.5 s. t3 = 5.7 s. T = t1 + t2 + t3 T = 6.03 + 24.5 + 5.7 = 36.23 s.
September 10, 2013

Algebra
81-9t^2-6t-6t-4 = 81-9t^2-12t-4 = -9t^2-12t+77 Use AC Method of factoring: A*C = -9*77 = -693 = 3*-231 = 21*-33. Use the part whose sum equals -12, the coefficient of B: 21, and -33. -9t^2+(21t-33t)+77 Divide the 4 terms into 2 factorable binomials: (-9t^2+21t) + (-33t+77) = -...
September 9, 2013

Algebra I
X = The number. -X = The opposite of the number. X = -X + 96 2x = 96 X = 48
September 9, 2013

physics
a. D^2 = X^2 + Y^2 D^2 = 5.8^2 + 38.8^2 = 1539.1 D = 39.2 m. b. tan A = Y/X = 38.8/5.8 = 6.68966 A = 81.5o, CCW. A = 90-81.5 = 8.5o East of North.
September 9, 2013

physics
d = r * t = 2.65m/s * 4.5s = 11.9 m = Distance ran by Henrietta in 4.5s. h = 0.5g*t^2 = 54.8 m. 4.9t^2 = 54.8 t^2 = 11.18 Tf = 3.34 s. = Fall time. d = Vo*Tf = 11.9 m. Vo*3.34 = 11.9 Vo = 3.56 m/s.
September 9, 2013

Physics
V^2 = Vo^2 + 2a*d Vo = 60,000m/3600s = 16.7 m/s d = (V^2-Vo^2)/2a d = (0-16.7^2)/-500 = 0.56 m.
September 9, 2013

Physics
a. 38 * t1 = 44 mi. Solve for t1. 89*t2 = 44. Solve for t2. T = t1-t2 b. d = 38(14/60) = 8.9 mi.
September 9, 2013

geometry
Scale Factor = 8/6 = 4/3.
September 9, 2013

geometry
Your answers are correct.
September 9, 2013

algerbra
-3b + ac = c-4 ac-c = -4+3b c(a-1)=-4+3b Divide both sides by (a-1): C = (-4+3b)/(a-1).
September 9, 2013

algebra
Please clarify your problem.
September 9, 2013

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