Thursday
October 30, 2014

Posts by henry


Total # Posts: 9,390

physics
F1 + F2 + F3 = 0 1800N[75o] + 1800N[294o] + F3 = 0 1800*cos75+i1800*sin75 + 1800*cos294+i 1800*sin294+F3 = 0, 465.87+i1738.7 + 732.1+i(-1644)+F3 = 0 1198 + i94.7+F3 = 0 F3 = -1198 - i94.7 = -1202 N.[4.52o] Tan Ar = -94.7/-1198 = 0.07905 Ar = 4.52o = Reference angle. A = 4.52...
April 23, 2014

finance
P = Po(1+r)^n Po = $11,000 r = (3%/4)/100% = 0.0075 = Quarterly % rate expressed as a decimal. n = 4comp./yr. * 9yrs. = 36 Compounding periods. Plug the above values into the given Eq and solve for P(principal).
April 23, 2014

math
P = Po(1+r)^n Po = $7700 Compounded Quarterly? r = (6%/4)/100% = 0.015 = Quarterly % rate expressed as a decimal. n = 4 comp./yr. * 5yrs = 20 Compounding periods. Plug the above values into the given Eq and get P = $10,370.78. I = P-Po
April 22, 2014

physics
V^2 = Vo^2 + 2g*h = 0 + 19.6*2 = 39.2 V = 6.26 m/s.
April 22, 2014

Physic
a. Impulse = 0.135*(36+47) = 11.2 b. a = (V2-V1)/t a = (47-(-36))/7*10^-4 = 118,571 m/s^2. F = m*a = 0.135 * 118,571 = 16,007 N.
April 22, 2014

Physics
See previous post: Mon,4-21-14,2:27 PM.
April 22, 2014

Physics
d1 = d2 0.5a*t^2 = 25t 0.5a*t = 25 0.5*0.004t = 25 t = 12,500 s. = 3.5 h.
April 22, 2014

Physics
See previous post: Mon,4-21-14,2:27 PM.
April 22, 2014

physics
h = 0.5g*t^2 = 10,000 Ft. 16t^2 = 10,000 t^2 = 625 Tf = 25 s. = Fall time. V*Tf = 2.09 miles. V * 25s = 2.09 V = 0.0836 mi/s * 3600s/h = 301 mi/h.
April 22, 2014

Inverse Trig
Y = arcsin1 = The angle whose sine is 1= 90o.
April 21, 2014

Physics
V=d/t = 300/0.75=400 km/h[135o]. Without wind. V = 400[135] + 80[270o] X == 400*cos135 = -282.8 km/h. Y = 400*sin135 + 80*sin270 = 202.8 km/h. Tan Ar = Y/X = 202.8/-282.8 = -0.71727 Ar = -35.65o = Reference angle. A = -35.65 + 180 = 144.3o V = X/cosA = -282.8/cos144.3 = 348 km...
April 21, 2014

Physics
Vp + Vw = 200kn/h[90o] Vp + (-50) = 200i Vp = 50 + 200i = 206.2km/h[76o]
April 21, 2014

Physics
Vo = 6.2m/s[10o] Xo = 6.2*cos10 = 6.106 m/s. Yo = 6.2*sin10 = 1.077 m/s. 1. h = ho + (Y^2-Yo^2)/2g h = 11 + (0-(1.077)^2)/-19.6 = 11.06 m. Above gnd. 2. h = 0.5g*t^2 = 11.06 m. 4.9t^2 = 11.06 t^2 = 2.257 t = 1.50 s. 3. d = Xo * t = 6.106m/s * 1.50s=9.17 m. 4. Y^2=Yo^2 + 2g*h= ...
April 21, 2014

physics
What is the air temperature?
April 21, 2014

physics
What is the temperature of the air?
April 21, 2014

physics
db1 = 10*Log(I/Io) db1 = 10*Log(10^(-11)/10^(-12) = 10*Log(10^(-11)*10^12) = 10*Log(10) = 10*1 = 10. db2 = 10*Log(10^(-8)/10^(-12) = 10*Log(10^(-8)*10^12) = 10*Log(10^4) = 10 * 4 = 40. 40 - 10 = 30db Difference.
April 21, 2014

physics
F = (9/5)C + 32 = 46o 1.8C = 46-32 = 14 C = 7.78o V=0.6T + 331 = 0.6*7.78 + 331=335.7 m/s. L = V*(1/F) = V/F = 335.7/1640=0.2047 m.
April 21, 2014

Physics
F = 120N.[130o] Fx = 120*cos130 = -77.13 N. Fy = 120*sin130 = 91.93 N.
April 20, 2014

physics
Mass = 1800Lb * 0.454kg/Lb = 817.2 kg V=30mi/h * 1600m/mi * 1h/3600s=13.33 m/s KE=0.5m*V^2 = 0.5*817.2*13.33^2 = 72,604 Joules. KE = 0.5m*(2V^2) = .5m*4V^2 = 4 times as great. KE = 0.5*0.002*500^2 = 250 J.
April 17, 2014

personal finances
B. is my choice.
April 17, 2014

trig
Mass = 725Lbs * 0.454kg/Lb = 329.2 kg. m*g = 329.2 * 9.8 = 3226 N. = Wt. of trailer. Fp = 3226*sin36 = 1896 N. = Force parallel to the ramp. F = Fp = 1896 N. Required.
April 16, 2014

math
A. I = Po^r*t = 1629.53*(0.1950/365)*21 = $18.28 B. Same procedure as A.
April 16, 2014

math
P = Po(1+r)^n Po = $1000. r = (3%/12)/100% = 0.0025 = Monthly % rate expressed as a decimal. n = 10yrs. * 12Comp/yr = 120 Compounding periods. Plug the above values into the given Eq and solve for P. I = P - Po
April 16, 2014

Physical sciences
Vd=100,000m/1h * 100000m/3600s=27.8 m/s = Velocity of driver. Fd = ((Vs-Vd)/(Vs+Ve))*Fe Fd = ((343-27.8)/(343+0))*900Hz Fd = (315.2/343) * 900 = 827 Hz = Freq. heard by driver. Vs = Velocity of sound in air. Ve = Velocity of the sound emitter (siren). Fe = Freq. emitted.
April 16, 2014

consumer math
I = Po*r*t = $60. 472.46*r*1 = 60 r = 0.127 = 12.7% = APR 0.25 * 629.95 = $157.49 = Down payment. 629.95 - 157.49 = $472.46=Amt. financed. (472.46+60)/12 = 532.46/12 = $44.37/mo. 472.46 + 60 = $532.46 = Total paid.
April 16, 2014

physics
Do/Dw = 0.84 Do/1 = 0.84 Do = 0.84 g/cm^3 = Density of the object Do/Df = 0.74 0.84/Df = 0.74 0.74Df = 0.84 Df = 1.135 g/cm^3 = Density of the fluid.
April 16, 2014

math
(680cm^3/s) / (1767cm^2/s) = 0.3848 cm = 0.003848 m.
April 15, 2014

Geometry
Divide both sides of Eq1 by (-4): Eq1: +3x + 2y = 5 Eq2: -3x + 9y = -27 Sum: 11y = -22 Y = -2 In Eq1, replace Y with (-2) and solve for X: 3x + 2*(-2) = 5 3x - 4 = 5 3x = 9 X = 3 Solution set: (x,y) = (3,-2)
April 15, 2014

physics
Circumference=pi*2r = 3.14 * 4m=12.57 m. V = 1800rev/min * 12.57m/rev * 1min/60s= 377 m/s.
April 15, 2014

math
Tan(90-31) = Y1/31 Tan(59) = Y1/31 = 1.66428 Y1=31 * 1.66428 = 51.6 = Ht. of shorter tower. Y1+Y2 = 51.6 + 31*sin25 = 64.7 m. = Ht. of taller tower.
April 13, 2014

physical science
d = V*t = 800 m. V * 5/2 = 800 V = 320 m/s.
April 13, 2014

science
Momentum = m*V = 20 * 5 = 100 kg-m/s.
April 13, 2014

Physics
C(-1.5,0.5), P(x,y) r^2 = (x+1.5)^2 + (y-0.5)^2 = 3^2 x^2+3x+2.25 + y^2-y+0.25 = 9 x^2+3x + y^2-y = 9-2.25-0.25 = 6.5 x^2+3x=(3/2)^2 + y^2-y+(-1/2)^2 = 6.5 x^2+3x+9/4 + y^2-y+1/4 = 26/4+9/4+1/4 x^2+3x+9/4 + Y^2-y+1/4 = 36/4 Multiply both sides by 4: 4x^2+12x+9 + 4y^2-4y+1 = 36...
April 12, 2014

algebra
Isn't there a sign between 30,000 and 1?
April 12, 2014

maths
KE = 0.5m*V^2 = 1000 J. 0.5*0.0081V^2 = 1000 0.00405V^2 = 1000 V^2 = 246,913 V = 497 m/s.
April 12, 2014

Physics
Vo = 210m/s[70o] Xo = 210*cos70 = 71.82 m/s. Yo = 210*sin70 = 197.3 m/s. 1. h = (Y^2-Yo^2)/2g=(0-197.3^2)/-19.6 = 1986 m.
April 11, 2014

physics
d = 0.5a*t^2 = 6 m. 0.5a*3.3^2 = 6 5.445a = 6 a = 1.102 m/s^2. V^2 = Vo^2 + 2a*d = 0 + 2.204*6 = 13.22 V = 3.64 m/s.
April 10, 2014

math
L = ? W = 8 h = 4 2W*h + 2L*h = 256 mm^2 2(8*4) + 2(L*4) = 256 64 + 8L = 256 8L = 256-64 = 192 L = 24 mm. Vol. = L*W*h = 24 * 8 * 4 = 768 mm^3
April 10, 2014

Math
P = 6 + 6*0.019*42 = 10.8 Billion.
April 10, 2014

Algebra
sqrt(-70)^2 = sqrt(70*(-1))^2 = 70*i^2 = 70 * (-1) = -70
April 9, 2014

physics
V=110km/h = 110,000m/3600s = 30.56 m/s. a=(V-Vo)/t = (30.56-0)/0.005=6111 m/s^2. F = m*a = 0.35 * 6111 = 2139 N.
April 9, 2014

physics
a = (V-Vo)/t = (30-0)/4 = 7.5 m/s^2.
April 9, 2014

physics
d = 53 + 53/5 = 63.6 m. T = d/r = 63.6/5 = 12.72 s.
April 9, 2014

physics
Fs = m*g = 127kg * 9.8N/kg = 1245 N. = Wt. of skier and toboggan. sin A = Y/r = 1.65/2.53 = 0.6522 A = 40.7o Fk = u*mg-u*T*sinA Fk = 1245u - u*148*sin40.7 Fk = 1245u - 96.5u = 1148u 148*cos40.7 - 1148u = m*a = m*0 = 0 1148u = 112.2 u = 0.098
April 9, 2014

Physical sciences
Fc = m*g = 330kg * 9.8N/kg = 3234 N. = wt. of crate. Fp = 3234*sin30 = 1617 N. = Force parallel to the incline. Fe - Fp = m*a Fe - Fp = m*0 = 0 Fe = Fp = 1617 N. = Force exerted.
April 9, 2014

physics
Circumference=pi*2r = 3.14 * 0.53=1.665 m. Va = 33.4m/s * 6.28rad/1.665m=126 rad/s a=(V-Vo)/t = (126-0)/11.6=10.87 rad/s^2.
April 9, 2014

Physics
Correction: Fk = u*Fc-u*Fap*sin27.3 Fk = 0.442*218.54 - 0.442*Fap*sin27.3 Fk = 96.6 - 0.203Fap Fap*cos27.3-(96.6-0.203Fap) = m*a 0.889Fap - 96.6 + 0.203Fap = m*0 1.092Fap = 96.6 Fap = 88.5 N. = Force applied. W = Fap*cos27.3 * d W = 88.5*cos27.3 * 9.3 = 731.3 J.
April 8, 2014

Physics
Fc = m*g = 22.3kg * 9.8N/kg = 218.54 N = Wt. of cart. Fk = u*Fc = 0.442 * 218.54 = 96.6 N. = Force of kinetic friction. Fap*cos27.3-Fk = m*a Fap*cos27.3-96.6 = m*0 = 0 Fap*cos27.3 = 96.6 N. W=Fap*cos27.3 * d = 96.6 * 9.3=898.3 J. Fap = Force applied = Tension in rope.
April 8, 2014

Math
X Tickets @ $75 each. (3500-X) Tickets @ $110 each. 75x + 110(3500-x) = 245,000+0.25*245,000 75x + 385,000-110x = 306,250 -35x = 306,250-385,000 = -78,750 X = 2250 Seats @ $75 each. 3500-x=3500-2250 = 1250 seats @ @110each
April 8, 2014

math
9x^2 * x^3 = 32 x^5 = 32 x^5 = 2^5 x = 2
April 8, 2014

Physict
d = d1(V2/V1)^2 = 15(150/50)^2 = 135 m.
April 8, 2014

math
0.05 * 173,000,000
April 7, 2014

math word problem
See previous post: Mon, 4-7-14, 3:36 PM.
April 7, 2014

math
See previous post.
April 7, 2014

geometry
2. m AB = (5-2)/(2-0) = 3/2. m BC = (0-5)/(3-2) = -5/1 = -5. 3. A'(-4,4), B'(-2,7), C'(1,2). 4. m AB' = (7-4)/(-2+4) = 3/2. m BC' = (2-7)/(1+2) = -5/3
April 7, 2014

Math word problems
L = 15x + 15y L = 15(x + y) x = 5 3/8 Yards y = 3/4 Yard L = Total length x + y = 5 3/8 + 3/4 = 43/8 + 6/8 = 49/8 = 6 1/8 Yards. L=15 * 49/8 = 91.875 Yards = 91 7/8 Yds.
April 7, 2014

physics
KE = m*V^2/2 = 4 * 4^2/2 = 32 Joules.
April 7, 2014

Math
See previous post: Sat, 4-5-14, 10:04 PM.
April 6, 2014

physics
Freq. = 5*10^6rad/s * 1rev/6.28rad = 7.958*10^5 rev/s = 7.958*10^5 Hz. Xl = WL = (6.28*7.958*10^5)*100*10^-6 = 500 Ohms. Xc=1/WC = 1/(6.28*7.958*10^5)*100*10^-12 = 2000 Ohms. Z = R + j(Xl-Xc) = 30 + j(500-2000) = 30 - j1500 = 1500.3Ohms [-88.9o] I = V/Z = 1.0[0o]/1500.3[-88.9...
April 6, 2014

Math
P(t) = 100(1-e^-0.12*3) P(3) = 100(1-0.6977) = 30.23% Fails. 100% - 30.23% = 69.7% Usable.
April 5, 2014

Math
The largest exponent of the variable is 2. Therefore, it is a 2nd degree polynomial.
April 5, 2014

College Physics
F1 = 8.2N[125o] F2 = 6.40N[233.4o] A. Fx = 8.2*cos125 + 6.40*cos233.4 = -8.519 N. B. Fy = 8.2*sin125 + 6.40*sin233.4 = 1.579 N. C. F^2 = -8.519^2 + 1.579^2 = 75.07 F = 8.66 N. D. Tan Ar=Fy/Fx = 1.579/-8.519=-0.18535 Ar = -10.5o = Reference angle. A = -10.5 + 180 = 169.5o = 10....
April 5, 2014

Algebra
C = (B/2)^2 = (9/2)^2 = 81/4.
April 4, 2014

physical science
Yes.
April 4, 2014

Math, Geometry
See previous post: Fri,4-4-14,1:14 AM.
April 4, 2014

Algebra
Use Quadratic Formula: X = (-0.8 +- sqrt(0.64+2.96))/-0.04 = -27.43, and 67.43 X = 67.43 m.
April 4, 2014

math
P = Po(1+r)^n Po = $10,000 r = 8%/100% = 0.08 = APR expressed as a decimal. n = 1comp/yr. * 18yrs. = 18 Compounding periods. Solve for P.
April 4, 2014

Math
Correction: c. % Grade = Slope expressed as a percentage.
April 4, 2014

Math
a. Y/X = Y/2.5 = 0.06 Y/2.5 = 0.06 Y = 0.15 Miles = 792 Ft. b. Y/X = Y/90 = 0.06 Y = 90 * 0.06 = 5.4 Miles = 28,512 Ft. c. % Grade = Slope expressed as a decimal.
April 4, 2014

math
P = Po(1+r)^n Po = $8500 r = (12%/4)/100% = 0.03 = Quarterly % rate expressed as a decimal. n = 1yr * 4comp/yr. = 4 compounding periods. Plug the above values into the given Eq and sole for P.
April 4, 2014

Physics
Va=63rev/min * 6.28rad/rev * 1min/60s= 6.594 rad/s. Angle=0.57 + 6.594rad/s*9.5s=63.21 rad. or 0.4132 rad.
April 3, 2014

percentages/word problem
(3456-1600)/1600
April 3, 2014

percentages/word problem
(30.60-18)/18 = 0.70 = 70%
April 3, 2014

percentages/word problem
C + 0.45C = 79.75 1.45C = 79.75 C = $55.00
April 3, 2014

Physics
Correction: Vo = 460.6 rad/s V = 45 rad/s a = -84.3 rad/s^2
April 3, 2014

Physics
Vo=4401rev/min * 6.28rad/rev * 1min/60s= 460.6 m/s V = 430 * 6.28/60 = 45 m/s. a=(V-Vo)/t = (45-460.6)/4.93=-84.3 m/s^2
April 3, 2014

physics
Depth = V*T = 1530 * 3.65/2 = 2792 m.
April 3, 2014

PHYSICS
V = Vo + g*Tr = 0 14 - 9.8Tr = 0 9.8Tr = 14 Tr = 1.43 s. = Rise time. h = ho + Vo*Tr + 0.5g*Tr^2 hmax = 70 + (14*1.43 -4.9*1.43^2)=80 m. Above gnd. hmax = 0.5g*t^2 = 80 4.9t^2 = 80 t^2 = 16.33 Tf = 4.04 s = Fall time. Tr+Tf = 1.43 + 4.04 = 5.47 s. = Time to strike gnd. V=Vo + ...
April 3, 2014

physics
Incomplete.
April 3, 2014

physics.
The liquid with the highest density will have the largest percentage of its' volume above the water. Find the density of each liquid and compare them.
April 3, 2014

Pre Algebra
(9+3+4+16+11+5+T)/7 = 6. Solve for T.
April 3, 2014

Physics
d = V*t = 1500m/s * 1.5/2 = 1125 m.
April 3, 2014

PHYSICS!!!
T = d/V = 200/7 = 28.57 s.
April 3, 2014

physics
P = F * d/t = mg * d/t P = 66*9.8 * 14/44 Joules/s.
April 3, 2014

Physic
The voltage across a battery is equal to the e m f of the battery only when there is no load on the battery. When a resistive load is connected across the terminals, a portion of the voltage is lost across the internal resistance of the battery.
April 3, 2014

Physics Help
L = V(1/F) + 0 Slope = V. V is a constant. y-intercept = 0
April 3, 2014

physics
All of the parameters change.
April 3, 2014

physics
PE = m*V^2 = 0.164 J. .0508*V^2 = 0.164 V^2 = 3.228 V = 1.80 m/s.
April 2, 2014

Physics
Va=219rev/20s * 6.28rad/rev=68.8 rad/s a=(V-Vo)/t = (68.8-0)/20=3.44 rad/s^2. Circumference=pi*2r = 6.28 * 68=427 cm= 4.27 m. d = 219revs * 4.27m/rev = 935.2 m.
April 2, 2014

Physics -- check answers please
1. My answer is zero, because the car did not move backwards. However, you should get a 2nd opinion. 2. KE = 0.5*m*V^2 = 40 Joules KE = 0.5*5*V^2 = 40 2.5V^2 = 40 V^2 = 16 V = 4 m/s. 3c. 4a. PE + KE = Constant 5. I don't know what you mean by 4 100 J If you mean 400 J. the...
April 2, 2014

business mat
I = Po*(r/360)*t = $15 740(r/360)*59 = 15 43,660r/360 = 15 121.28r = 15 r = 0.1237 = 12.37%/yr.
April 2, 2014

business Math
(115-100)/100 = 0.15 = 15%.
April 2, 2014

Business Math
I = Po*r*t = $1.307 45,000*(0.04/365)*t = 1307 Solve for t in days. NOTE: Exact interest is based on 365 days per year instead of 360 days.
April 2, 2014

Algebra
X = 3y^2 K = Yv = -B/2A = 0/6 = 0 h = Xv = 3 * 0^2 = 0 D(X1,K), V(h,K), F(X2,K). D(X1,0), V(0,0), F(X2,0) DV = 0-X1 = 1/4a = 1/12 0-X1 = 1/12 X1 = -1/12 VF = X2-0 = 1/4a = 1/12 X2 = 1/12
April 2, 2014

physics
a = (Fap-Fk)/m = (160-24)/20 = 6.8 m/s^2
April 1, 2014

physics
V = Vo + a*t = 30 m/s 0 + a*4 = 30 a = 30/4 = 7.5 m/s^2.
April 1, 2014

Math
Can you clarify your problem?
April 1, 2014

Math
(150-73)/150 = 0.51 = 51%
April 1, 2014

science
750W * 1hp/746W = 1.0 hp.
March 31, 2014

math
post it.
March 31, 2014

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