Friday
July 29, 2016

Posts by henry

Total # Posts: 11,916

Math Need Help
a. 100/140 = 0.714 = 71.4 %. Change = 71.4 - 100 = -28.6 % = 28.6% decrease. b. 140/100 = 1.40 = 140%. Change = 140-100 = 40% increase. = The largest change.
July 27, 2016

Math
P = (Po*r*t)/(1-(1+r)^-t). Po = 150,000-24,000 = $126,000. r = 8.65%/(12*100%) = 0.0072. t = 25yrs. * 12mo./yr. = 300 mo. Monthly Payments = P/t.
July 27, 2016

physics
a. V^2 = Vo^2 + 2g*h. Vo = 0, g = 9.8 m/s^2, h = 20 m, V = ?. b. V^2 = Vo^2 + 2a^d = 0. V = 0, Vo = V calculated in part a, d = 0.10 m, a = ?.
July 25, 2016

physics
a. V = Vo + a*t = 20m/s. 35 + a*608t = 0, = 20, a = -0.25 m/s^2. d = Vo*t + 0.5a*t^2. Vo = 35 m/s, t = 60 s., a = -0.25 m/s^2. b. V = Vo + a*t = 0, 20 - 0.25t = 0, t = 80 s.
July 25, 2016

physics
a. (20+30)/2 = 25 m/s. = Avg. speed. b. 20*t1 = 10,000m., t1 = 500 s. 30*t2 = 10,000m, t2 = 333.3 s. Total time = t1+t2 = 500 + 333.3 = 833.3 s. Avg. speed = (d1+d2)/(t1+t2) = 20,000/833.3 = 24 m/s.
July 25, 2016

math
25/2 = 12.5 0r 12 Pens.
July 23, 2016

science
76.6 - 67.7 =
July 22, 2016

science
Density = 25grams/29.4cm^3 = 0.85 grams/cm^3.
July 22, 2016

physics
Vo = 26.2 m/s[23o]. Yo = 26.2*sin23 = 10.2 m/s. a. Y^2 = Yo^2 + 2g*h = 0. 10.2^2 - 19.6h = 0, 19.6h = 104.8, h = 5.3 m. d*sin23 = 5.3, d = 13.7 m. up hill.
July 21, 2016

physics
Vo = 30km/h = 30,000m/3600s = 8.33 m/s. Vc = 192km/h = 192,000m/3600s = 53.3 m/s. Vm = 150 m/s. V = Vo - Vc + Vm
July 21, 2016

Math
Po - 0.20Po + 0.06Po = $55.12, 0.86Po = 55.12, Po = $64.09 = Original price.
July 20, 2016

Math
8500 + 350/yr.*5yrs. = 10,250 students = Enrollment in yr. 2000. 350/yr. * 5yrs. = 1750 Students enrolled from 1995 to yr. 2000.
July 17, 2016

math
8*10^6 * 1h/3600s * 1day/24h = 92.6 = Ninety-third day.
July 16, 2016

math
4*500k + 10*200k = $4 Million.
July 16, 2016

Physics
h = 0.5g*t^2 = = 4.9*4^2 = 78.4 m. Y = Yo + g*t = 0 + 9.8*4 = 39.2 m/s. V = Xo + Y = 20 + 39.2i = 44m/s[63o]. d = Xo*t = 20 * 4 = 80 m. from base of bldg.
July 11, 2016

physics
d1 = 10km/1.6 = 6.25 mi. d1 = r1*t1 = 12.71*t1 = 6.25, t1 = 0.492 h. d2 = (10-2.1)km/1.6 = 4.94 mi. d2 = r2*t1 = r2*0.492 = 4.94, r2 = 10 mi/h. = min. speed to win.
July 11, 2016

physics
Speed = 10km/29.5min * 1mi/1.6km * 60min/h = 12.71 mi/h.
July 11, 2016

physics
r1*t = 6, r * (18/60) = 6, r1 = 20 mi/h. r2 * (9/60) = 6, r2 = 40 mi/h. r = (r1+r2)/2 = 60/2 = 30 mi/h. = Avg. speed when driving to and from the theatre.
July 11, 2016

physics
V = 0.9mi/0.5h = 1.8 mi/h. V = 1.8 mi/h * 1600m/mi * 1h/3600s = 0.8 m/s. V = 0.8m/s * 1km/1000m * 3600s/h * 24h/day = 69.12 km/day.
July 11, 2016

physics
d = pi*2r/2 = 3.14*30/2 = 47.1 m. D = 2*r = 2*15 = 30 m. r*t = 47.1, r = 47.1/t = 47.1m/120s. = 0.39 m/s. V = D/t = 30m/120s = 0.25 m/s.
July 11, 2016

Math
Tan x = 5/2 = 2.50, X = 68.2o. Tan y = 1/4 = 0.25, Y = 14.0o. Tan 14 = 10/d1, d1 = 40.1 m. = Distance from bottom of window to foot of tower. Tan 68.2 = d2/40.1, d2 = 100.3 m. = Vert. distance from top of window to top of tower. h = 10m + d2 = 10 + 100.3 = 110.3 m.
July 10, 2016

PHYSICS
Yes, I agree.
July 10, 2016

PHYSICS
KE = 0.5M*V^2. V^2 = Vo^2 + 2g*h = 0 + 19.6*3 = 58.8.
July 10, 2016

PreCalculus 1
d. 16*Tf^2 = 27.25-10 = 17.25. Tf = 1.04 s. Dx = Xo*(Tr+Tf) = 130*2.28 = 296.7 Ft. 327-296.7 = 30.3 Ft. from bottom of fence. d^2 = 30.3^2 + 10^2 = 1019.3, d = 31.9 Ft from top of fence.
July 7, 2016

PreCalculus 1
Vo = 136Ft/s[17]. Xo = 136*cos17 = 130 Ft/s. Yo = 136*sin17 = 39.8 Ft/s. b. Y = Yo + g*Tr = 0, 39.8 - 32Tr = 0, Tr = 1.244 s. = Rise time. h = 2.5 + 39.8*1.244 - 16*1.244^2 = 27.25 Ft a5ove gnd. 16*Tf^2 = 27.25, Tf = 1.305 s. = Fall time. 1.244+1.305 = 2.549 s. to hit ground. ...
July 7, 2016

Math
(x,0), (-8,9), (0,y). X = 3y, (3y,0), (-8,9),(0,y). m = (9-0)/(-8-3y) = (y-9)/(0+8), 72/(-8-3y) = y-9, -8y-3y^2+72+27y = 72, -3y^2+19y = 0, y(-3y+19) = 0, Y = 0, -3y+19 = 0, 3y = 19, X = 3y = 19, Y = 6 1/3 = 19/3. m = 9/(-8-19) = -1/3. Y = mx + b = 9, (-1/3)(-8) + b = 9, b = 9...
July 7, 2016

Physics
M*(V2-V1) = 0.1(-20-30) = -5 = The Change in momentum
July 7, 2016

Pre Calculus
Log4 65,536 = X. 4^x = 65,536, x*Log 4 = Log 65,536, X = Log 65536/Log 4 = 8.
July 6, 2016

Pre Calculus
Log3 36 = N, 3^N = 36, Take Log of both sides: N*Log 3 = Log 36, N = Log 36/Log 3 = 3.26. Answer: e. None of these.
July 6, 2016

Analytic geometry
2. (-8,8), (x,y), (2,2). x-(-8) = 2(-2-x), x+8 = -4-2x, X = -4. y-8 = 2(2-y), Y = 4. (-8,8), (-4,4), (-2,2). m = (4-8)/(4-(-8)) = -1. Y = mx+b = 8, -1*(-8)+b = 8, b = 0. Eq: Y = -x.
July 6, 2016

Analytic geometry
1. (-3,0), (x,y), (3,-5). (3-(-3) = 2(x-(-3), 6 = 2x+6, X = 0. (-5-0) = 2(y-0), -5 = 2y, Y = -2.5. (-3,0), (0,-2.5), (3,-5). m = (-2.5-0)/(0-(-3)) = -5/6. Y = mx + b, -5x/6 + b = 0, -5*(-3)/6 + b = 0, b = -5/2 = -2.5. Eq: Y = (-5/6)x - 5/2.
July 6, 2016

Physics
Cos15 = 0.966.
July 4, 2016

Physics
Ws = M*g = 20 * 9.8 = 196 N. Fp = 196*sin20 = 67 N. Fn = 196*Cos20 - F*sin15 = 184-0.26F. Fs = 0.2(184-0.26F) = 36.8-0.052F. = Static friction. F*Cos15-Fp-Fs = M*a. 0.97F-67-(36.8-0.052F) = M*0 = 0. 0.97F-67-36.8+0.052F = 0, 1.022F = 36.8, F = 36 N.
July 4, 2016

Physics
Wb =M*g = 30 * 9.8 = 294 N. = Fn. Fap-Fs = M*a, 85-Fs = M*0 = 0, Fs = 85 N. u = Fs/Fn = 85/294 = 0.289.
July 4, 2016

Physics
M*g = 25 * 9.8 = 245 N. = Wt. of box. Fp = 245*sin40 = 157.5 N. = Force parallel to the incline. Fn = 245*Cos40 = 187.7 N = Force perpendicular(normal) to the incline. Fap-Fp-Fk = M*a. 500-157.5-Fk = 25*0.75, Fk = ?. k = Fk/Fn
July 4, 2016

Math
P = Po(1+r)^n P = 0.25 * 29,000 = $7,250 To be saved in 2 years. r = 0.10/2 = 0.05 = Semi-annual % rate. n = 2comp./yr. * 2 yrs. = 4 Compounding periods. Po(1.05)^4 = 7250. Po = 7250/1.05^4 = $5964.59 To be invested now. 0
July 4, 2016

physics
Vo = 20mi/h * 1600m/mi * 1h/3600s = 8.89s. V = 60mi/h = 26.7 m/s. a = (V-Vo)/t = (26.7-8.89)/10.8 = 1.65 m/s^2. d = Vo*t + 0.5a*t^2
July 2, 2016

physics
Vr = 5.35 + 15.7i = 16.7 mi/h[71.2o] = Resultant velocity.
July 2, 2016

science physics
F3 = -16N. = 16N.[180o].
June 30, 2016

science physics
F3 = -16 N. = 16N.[180o].
June 30, 2016

science physics
F3 = -16 N. = 16N.[180o].
June 30, 2016

science physics
F1+F2+F3 = 0, 10 + 6 + F3 = 0, F3 = -16 N.
June 30, 2016

math
Ganga received $X. Gayatri received (36,000/24,000) * x = $1.5x. x + 1.5x = P, X = 0.4P. x + (1.5x-2500) = 0.5P. Replace X with 0.4P: 0.4P + 0.6P = 0.5P + 2500, P = $5000. = Total profit. g
June 30, 2016

Physics
V^2 = Vo^2 + 2a*d. V = 10.4 m/s, Vo = 5.20 m/s, a = 4.20 m/s, d = ?.
June 28, 2016

science
V^2 = Vo^2 + 2a*d. V = 0, Vo = 500 m/s, d = 0.10 m, a = ?. "a" will be negative.
June 28, 2016

Maths
Eq1: 1.4x + 3y = -1. Eq2: -3x + 2y = -12. Multiply Eq1 by -2, Eq2 by 3, and add: -2.8x - 6y = 2 -9x + 6y = -36 Sum: -11.8x = -34, X = 2.88. In Eq1, replace X with 2.88 and solve for Y.
June 26, 2016

ALGEBRA
Walking rate = r mi/h. Time = (T-3) hrs. r*(T-3) = 6, r = 6/(T-3). Driving rate = 12r mi/h. Time = T hrs. 12r*T = 180, Replace r with 6/(T-3): (12^6/(T-3))*T = 180, 72T/(T-3) = 180, 72T = 180*(T-3), 72T = 180T-540, T = 5 hrs. r = 180mi/5h = 36 mi/h.
June 25, 2016

pysics
128km/h = 128,000m/3600s = 35.6 m/s. 128km/h * 1mi/1.6km = 80 mi/h.
June 25, 2016

Math: Personal Finance
V = 20,000 - 0.25*20,000 = 15,000 = Value after 1 yr. 15,000 - 500 = $14,500. = Amt. paid by Ins.
June 22, 2016

Math: Personal Finance
P = Po*r*t/(1-(1+r)^-t). r = 0.065/12mo. = 0.00542/mo. = Monthly % rate. P = 750/mo. * 360mo. = $270,000. P = (Po*0.00542*360)/(1-1.00542^-360) = 270,000, (Po*1.950)/0.8571 = 270,000, 2.275Po = 270,000, Po = $118,675.38.
June 22, 2016

Personal Finance
P = Po(1+r)^n = $3,000. r = 0.06/12mo. = 005/mo. n = 12Comp./yr. * 5yrs. = 60 Compounding periods. Po(1.005)^60 = 3000, Po = ?.
June 20, 2016

math
c. (840/1192.80)*100% =
June 20, 2016

math
a. 1192.80 - 10,080/12 = 1192.80 - 840 = $352.80. b. M = 352.80/840 = 0.42 = 42%.
June 20, 2016

math
200 * 1.60 = $320 = Total cost. Selling price = $P. (0.4*200)cookies * 1.50/cookie = $120 Received for broken cookies. (0.6*200)P + 120 = 1.35*320, 120P + 120 = 432, P = $2.60 each.
June 20, 2016

Physics
V^2 = Vo^2 + 2a*d = 0. 30^2 + 2a*0.1 = 0, 0.2a = -900, a = -4500 m/s^2. F = M*a = 0.1 * (-4500)= -450 N.
June 18, 2016

Physics
a. V^2 = Vo^2 + 2g*h = 24^2 - 19.6 *(13-2) = b. V = Vo + g*t. V = (part a), Vo = 24 m/s, g = -9.8m/s^2, t = ?.
June 18, 2016

math
P1: X min. P2: 2x min. 2x*x/(2x+x) = 18, 2x^2/3x = 18, 2x/3 = 18, 2x = 54 min, X = 27 min.
June 16, 2016

Trigonometry
Tan11.3 = h/50, h = ?.
June 16, 2016

Trigonometry
Tan15 = 1000/d, d = ?
June 16, 2016

Trigonometry
1. We draw 2 rt triangles with a common vertical side: 1. Draw hor. line OB. 2. Locate point "A" to the left of "B" to form AB. 3. Draw a ver. line at O and label it 70 m. 4. Draw the hyp. of each triangle with one going to A and B. Tan60 = 70/OA, OA = 70/...
June 16, 2016

Math
Please check for Typos.
June 16, 2016

physics of science
d = 2.54cm/in * 0.01in 0.0254 cm = 2.54*10^-4 m. V^2 = Vo^2 + 2a*d. a = (V^2-Vo^2)/2d =(0-400)/5.08*10^-4 = -7.87*10*5 m/s^2.
June 16, 2016

physics of science
V^2 = Vo^2 + 2a*d. a = (V^2-Vo^2)/2d =
June 16, 2016

science
sin25.4 = h/53, h = 53*sin25.4 = 22.7 m. PE = M*g*h = 60*9.8*22.7 = 13,367 J. KE = PE, 0.5M*V^2 = 13,367, 30*V^2 = 13367, V = 21.1 m/s. = Velocity at bottom of slope.
June 15, 2016

Physics
h = Vo*t + 0.5g*t^2 = 12 m. Vo*0.536 - 4.9*0.536^2 = 12, Vo = 25.0 m/s. V = Vo + g*t = 25 - 9.8*0.536 = 19.8 m/s When caught.
June 15, 2016

Pre-Cal
sin63 = h/13, h = ?
June 15, 2016

physics
All angles are measured CCW from due East. Vr = 3 + 5[300o]. Vr = 3 + 5*cos300+5*sin300 = 3 + 2.5 - 4.33i = 5.5 - 4.33i = 7m/s[322o] = Velocity of the rain. 322o CCW = 38o S. of E.
June 15, 2016

science
D = Zero.
June 15, 2016

physical science
Vo = 60mi/h * 5280Ft/mi * 1h/3600s = 88 Ft/s. V = 50/60 * 88Ft/s = 73.3 Ft/s. V = Vo-a*t = 88-2*3 = 82 Ft/s. Yes, because The driver is still above the speed limit after decelerating for 3 seconds.
June 14, 2016

maths
Let adjacent angle = X degrees. There are 4 angles; the opposite angles are equal. x + (x-20) + x + (x-20) = 360o. X = 100o, (x-20) = 80o.
June 14, 2016

Physics
Vo = 120m/s[35o]. Xo = 120*Cos35 = 98.3 m/s. Yo = 120*sin35 = 68.8 m/s. a. Y = Yo + g*Tr = 0. 68.8 - 9.8Tr = 0, Tr = 7.02 s. = Rise time. h = ho + Yo*Tr + 0.5g*Tr^2 = 20 + 68.8*7.0 - 4.9*7.0^2 = 261.5 m. above gnd. 0.5g*Tf^2 = 261.5. 4.9*Tf^2 = 261.5, Tf = 7.31 s. = Fall time...
June 12, 2016

Algebra
If 1/2 = 2/4, Then 2/1 = 4/2.
June 11, 2016

physics
Correction: Speeder: Vo = 117,000m/3600s = 32.5 m/s. Ds = 32.5*t = Distance traveled by speeder. Patrol car: a = (7600m/3600s)/s = 2.11 m/s^2. a. 32.5t = 0.5*2.11*t^2, 1.05t = 32.5, t = 31 s. b. Ds = Dp = 32.5*t = 32.5*31 = 1006 m.
June 10, 2016

physics
Speeder: Vo = 117,000m/3600s = 32.5 m/s. Ds = Vo*t = 32.5*t. = Distance traveled by speeder. Patrol car: a = (7600m/3600s)/s = 2.11 m/s^2. V = 175,000m/3600s = 48.6 m/s. Vo = 0. V^2 = Vo^2 + 2a*D, Dp = V^2/2a = (48.6)^2/4.22 = 560 m = Distance traveled by patrol car. a. Ds = ...
June 10, 2016

Pre-Calculus
X type A printers. Y type B printers. Eq1: x + y => 100. Eq2: 45x + 35y => 3850. Multiply Eq1 by -35 and add the Eqs: -35x - 35y => -3500. +45x + 35y => +3850. 10x => 350, X => 35 Type A printers. In Eq1, replace x with 35: 35 + y => 100, Y => 65 Type B...
June 8, 2016

maths,science, physics
M1*V1 + M2*V2 = M1*V + M2*V. 4000*3.5 + M2*0 = 4000*2 + M2*2 14,000-8000 = 2M2 M2 = 3,000 kg.
June 5, 2016

Physics
V = Vo + g*Tr = 0. Tr = -Vo/g = -20/-9.8 = 2.04 s. = Rise time. h = ho + Vo*Tr + 0.5g*Tr^2. h = 29 + 20*2.04 - 4.9*2.04^2 = 49.4 m Above gnd. 0.5g*Tf^2 = 49.4, 4.9Tf^2 = 49.4, Tf^2 = 10.08, Tf = 3.18 s. = Fall time. T = Tr + Tf = 2.04 + 3.18 = 5.22 s. To strike the water.
June 4, 2016

physics
F = 8beats/8s. = 1beat/s = 1cycle/s = 1 Hz.
June 4, 2016

Physics
All angles are measured CCW from due east. D = 29km[60o] + 20km[270o] + 10km[150o] =
June 3, 2016

Physics
Correction: D = 23i + 19.9+11.5i = 19.9 + 34.5i = 39.8m[60.0o]. Direction = 60.0o N . of E.
June 3, 2016

Physics
D = 23[90o] + 23[30o]. D = 23i + 19.9+11.5i = 19.9 + 42.9i = 47.3m[65.1o]. Direction = 65.1o N. of E.
June 3, 2016

Physics
V = 36km/h = 36000m/3600s = 10 m/s. V = Vo + a*t = 10 m/s. 0 + a*10 = 10, a = 1 m/s^2. V = Vo + a*t = 0. 10 + a*20 = 0, 20a = -10, a = -0.5 m/s^2.
May 31, 2016

physics
Vb = Di/Dw * Vi = Vi/9. Di/1000 * Vi = Vi/9, Divide both sides by Vi: Di/1000 = 1/9, Di = 1000/9 = 111.11 kg/m^3 = Density of the ice cube.
May 31, 2016

Physics
k = 50N/(25-20)cm = 10N/cm. L = 20 + 100N*1cm/10N = 20 + 10 = 30 cm.
May 28, 2016

finance
a. Net Income = 591,000 - 255,000 - 0.36*591,000 = b. $591,000. c. 0.36 * 591000 =
May 22, 2016

General Chemistry
Thank you bobpursley..how can I determine the max concentration for Fe(OH)3 that will dissolve though?
May 20, 2016

General Chemistry
Ferric Hydroxide, Fe(OH)3, is an insoluble salt with a solubility of 10^-39. 1) What is the maximum concentration of ferric hydroxide that can dissolve? 2) Using Le Chatalier's Principle, explain why iron (III) solutions are more soluble in acidic solution.
May 20, 2016

math
Smaller box = 2*2*3. Larger box = 3*4*5. 2 small boxes stacked = L*W*2h = 2*2*6. Too tall to fit in large box. 2 small boxes side-by-side = L*2W*h = 2*4*3. So 2 smaller boxes will fit in the larger box.
May 20, 2016

Physics
K = 0.5N/0.0.6cm = 0.833 N/cm. Length = 35 + 2N*1cm/0.833N = 37.40 cm. Increasing the force above 2N do not increase length further.
May 14, 2016

math
The first and the last terms of an Arithmetic Progression are 6 and 171 in that order. If there are 14 terms, find the 16th term of the Arithmetic Progression.
May 8, 2016

Physics
See previous post.
May 7, 2016

Physics
3.10km[25o]. 3.1*sin25 = 1.31 km due north, 3.1*Cos25 = 2.81 km due east. I assumed you meant 25o N. of E, because northeast = 45o.
May 7, 2016

physics
Convert to unit Vector: (51.2,30.8). Tan A = Y/X = 30.8/51.2 = 0.60062, A = 31o. R = = X/Cos A = 51.2/Cos31 = 59.7km[31o]. (x/59.7,y/59.7) = (51.2/59.7,30.8/59.7) = (0.86,0.52).
May 7, 2016

physics
a. 30km[315o,CCW] = 21.21 - 21.21i. b. 60km[60o,CCW] = 30 + 52i. R = 21.21-21.21i + 30+52i = 51.2 + 30.8i.
May 7, 2016

physics
Vo*t + 0.5a*t^2 = 62.4 m. Vo*4.2 - 0.5*5.6*4.2^2 = 62.4, 4.2Vo - 49.39 = 62.4, 4.2Vo = 111.79, Vo = 26.6 m/s. V^2 = Vo^2 + 2a*d. Vo = 26.6 m/s, a = -5.6 m/s^2, d = 62.4 m, V = ?.
May 7, 2016

physics
V = Vo + a*t. V = 0, a = -2.5 m/s^2, t = 10 s, Vo = ?.
May 7, 2016

Math?
The Lateral area is the area of the 4 vertical sides: A = 2(5*7) + 2(16*5) = 230 m^2.
May 6, 2016

Maths
2. V = Vo(1-r)^n. a. V = 1500(1-0.21)^6 = $364.63 b. V = 1500(1-0.21)^n = 60. 1500(0.79)^n = 60, 0.79^n = 60/1500 = 0.04, n*Log0.79 = Log0.04, n = Log0.04/Log0.79 = 13.7 Years.
May 6, 2016

math
Ar = Ab - Ad. Ar = 15000 - 15000*(0.075/360)*120 = $14,625 = Amt. received(proceeds). Ar = Amount received. Ab = Amount borrowed. Ad = Amount discounted.
May 6, 2016

math 5th grade
L = 5/6 yds. = 2 1/2 Ft. W = 3*2 1/2 = 15/2 = 7 1/2 Ft. Area = L*W = 2 1/2 * 7 1/2 = 5/2 * 15/2 = 75/4 = 18 3/4 square Ft. Or Area = L*W = 5/6 * 2 1/2 =[ 5/6 * 5/2 = 25/12 = 2 1/12 sq. yds. 1yd = 3ft, 1sq yd. = 3^2 = 9 sq. Ft. A = 2 1/12sq yds * 9sq ft/sq yd = 25/12 * 9 = 225/...
May 5, 2016

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