Thursday

March 5, 2015

March 5, 2015

Total # Posts: 10,187

**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*

**phisecs**

Power = 19kW = 19000W = 19,000 Joules/s. Power = F*V = F * 29 = 19,000 J./s F = 19,000/29 = 655.2 N.
*March 31, 2014*

**phisecs**

a = (V^2-V0^2)/2d a = (0-17^2)/40 = - 7.23 m/s^2.
*March 31, 2014*

**algebra**

x-1 = x+5 x-x = 5+1 0 = 6. No Solution.
*March 30, 2014*

**Physics**

What is the mass of the crate?
*March 30, 2014*

**Physics**

V=90mi/h * 1600m/mi * 1h/3600s.= 40 m/s. a = (V-Vo)/t = (40-0)/0.5 = 80 m/s^2.
*March 29, 2014*

**Physics**

Work = F*h = mg * h = 6*9.8 * 4=235.2 J. Work = F*h = 12 * 5 = 60 J. Work = 5*8 = 40 J. PE = mg*h = 5 * 8 = 40 J.
*March 28, 2014*

**Physics**

L = V/F = 199 m. F = V/199 = 300*10^6/199=1.51*10^6 cy/s= 1.51*10^6 Hz. WL = 1/WC C = 1/W^2*L C=1/(6.28*1.51*10^6)^2*785*10^-6=0.0142 nanofarads.
*March 28, 2014*

**World History**

What role did the Jacobins play in the French Revolution? The Jacobins reached an agreement with moderate French leaders to end the revolution. The Jacobins opened French gov't to full participation by women. The Jacobins returned France to a monarchy by supporting ...
*March 27, 2014*

**History**

How was James I's rule of England similar to peter the great's rule of Russia? Both reduces the size of their empire. Both increased their own power without approval by other government entitles. Both relied heavily on the opinions of their subjects when making ...
*March 27, 2014*

**Electricity**

Q = C*V = 10*10^-9F * 5V = 50*10^-9 Coulombs.
*March 27, 2014*

**math**

Got it! thanks
*March 26, 2014*

**math **

for the line segment whose endpoints are r(1,2) and s(6,7), find the point located 3/4 the distance from r to s.
*March 26, 2014*

Pages: <<Prev | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | **18** | 19 | 20 | 21 | 22 | 23 | 24 | Next>>