# Posts by Henry

Total # Posts: 13,500

**Physics**

a. S = d/t = (25+25)/(10.01+10.22) = yds/s. b. S = d/t = 25/10.01 = yds/s.

**math**

15c + 12w = 13.20*100 = 1320. Eq1: 15c + 12w = 1320. Eq2: C + W = 100. Multiply both sides of Eq2 by (-15) and add the Eqs. Remember that C and W are in KGs.

**math**

N = 2bags * bBeans/bag = 2b. So N = 2b.

**physics**

h = 0.5g*Tf^2 = 703 m. 4.9Tf^2 = 703, Tf = Fall time = ?. Tr+Tf = Time in light. c. Range = X1*(Tr+Tf).

**physics**

V1= 120m/s[78o]. X1 = 120*Cos78 = 24.9 m/s. Y1 = 120*sin78 = 117.4 m/s. a. Y2^2 = Y1^2 + 2G*h. 0 = 117.4^2 - 19.6h, h = ?. b. V2 = V1 + g*Tr. 0 = 117.4 - 9.8Tr, Tr = 12 s. = Rise time.

**Physics**

a. Va = 6rev/4s * 6.28rad/rev = 9.42 rad/s. b. Circumference = pi*2r = 3.14*0.30m = 0.942 meters. V = 9.42rad/s. * 0.942m/6.28rad = m/s = Linear or Tangential velocity.

**Science**

3. B.700 N. (Your Mass does not change).

**physics**

V2 = V1 + a*t. V2 = -8 m/s, V1 = 30 m/s, t = 0.010 s, a = ?.

**physics**

a. I = (20*200)/(240) + 1500/240. I = 16.67A + 6.25A = 22.92A. b. Energy = ((10*0.20kW) + 1.50kW.)*5h = 17.5kWh.

**math**

a. Cost = $93/mo. * 15mo. = $1395. b. Carrying Charge = 1395-1250 = c. $1250/($93/mo.) =

**Algebra, Probability needed ASAP**

See Related Questions: Thu, 5-7-15, 5:14 AM.

**math**

Cost = 45 + 0.21x = 66. X = ?.

**speed**

Tom's speed = X km/h. Jerry's speed = x-2 km/h. Tom: d = x * t. = 4x. Jerry: 4d/5 = (x-2)*t d = (1.25x - 2.5)t d = (1.25x - 2.5)4 d = 5x - 10. d = 4x = 5x - 10 4x = 5x - 10 X = 10 km/h. d = 10km/h * 4h = 40 km. = Length of the route.

**Physics**

Fo = M*g = 12 * 9.8 = 117.6 N. = Force of the object. Fp = 117.6*sln30 = 58.8 N. = Force parallel to the incline. Fn = 117.6*Cos30 = 101.8 N. = Normal force. Fs = u*Fn = 0.65 * 101.8 = 66.2 N. - Force of static friction.

**Physics**

a. t = d/V = 11*10^12m/(3*10^9m/s) = 3667 s. = 1.02 h. b. Wavelength = V/f = 3*10^8m/s/(8*10^9c/s) = 0.0375 m.

**science**

Disp. = 30i + 20 + 30*sqrt2[225o] Diep. = 30i + 20 + -30-30i = -10m = 10m West. For a different approach, see Related Questions: Sun, 7-29-12, 11:05 AM.

**physical science**

Load force = 600 N. Effort force = 100 N.

**Geometry**

A cone has diameter 12 and height 9. A cylinder is placed inside the cone so the base of the cylinder is concentric with the base of the cone and the upper base of the cylinder is contained in the surface of the cone. If the volume of the cone is nine times the volume of the ...

**physics**

See previous post: Mon., 5-8-17, 2:43 PM.

**physics**

a. Wavelength = 2 * 4m = 8 Meters. b. Wavelength = V/F1 = 8m. 340/F = 8, F1 = ?. F1 = Frequency of 1st harmonic. c. F2 = 2 * F1.

**physics**

Vs = 332 + 0.6*(-10) = 326 m/s = Velocity of sound. d = Vs * t/2 = 326 * 5/2 = 815 m.

**physics**

Vt = 180km/h = 180,000m/3600s = 50 m/s. = Velocity of the train. Vs = 332 + 0.6T = 332 + 0.6*19 = 343 m/s = Velocity of sound. Fr = ((Vs-Vr)/(Vs+Vt)) * Fh. Fr = ((343-0)/(343+50)) * 3500 = Fr = Frequency heard by the receiver(listener).

**algebra**

-11*sqrt(112) = -11*sqrt(16*7) = -11*4*sqrt(7) = -44*sqrt(7).

**Physics 20**

F = M*a, a = F/M = -1500/75.5 = -19.9 m/s^2.

**maths**

a. Area = L*W = 4.5 * 6 = 27m^2. b. Cost = 27m^2 * $20/m^2 = $540.

**thermal physics**

30mm = 0.030m. k = 2N./0.03m = 66.7 N/m. F = 66.7N/m * 0.035m - 2N. = 2.33 - 2 = 0.33 N. = Addition force.

**Math**

1. (4x^2 + 15x - 3) - (3x^2+5) = 4x^2 + 15x - 3 - 3x^2 - 5 = x^2 + 15x - 8. 2. -3f^2 + 4f - 3 + 8f^2 + 7f + 1 = 5f^2 + 11f - 2. 3. Ans: b. 4. Ans: b. 5. Ans: a. 6. Ans: -7. 7. 2^2 * 2^8 = 2^10. 8. (2.5*10^4)(4*10^3) = 10*10^7 = 1*10^8. 9. When multiplying, add the exponents: 5...

**Physics**

V1 = 115km/h = 115,000m/3600s = 31.94 m/s. V2 = 25km/h = 25,000/3600s = 6.94 m/s. V2^2 = V1^2 + 2a*d. d = 100 m., a = ?. Retardation is negative acceleration. Therefore, "a" will be negative.

**Maths**

1/3 = 3/9 = tomato juice. 2/3 * 2/3 = 4/9 = carrot juice. 9/9 - 3/9 - 4/9 = 2/9 = apple juice. (2/9)/(4/9) * 315mL = 1/2 * 315mL = 157.5 mL = apple juice.

**Maths**

Hasim counted his money. he gave 1/3 to his brother. he spent £12 on his sister. What he had left was half what he had at the beginning. how much did he give his brother?

**Physics**

Fk = u*Fn = 0.08*9.8M = 0.784M. -0.784M = M*a. a = -0.784 m/s^2. V^2 = Vo^2 + 2a*d. 0 = 6.7^2 - 2*0.784d, 1.568d = 44.89, d = 28.6 m.

**pls help physics hw**

Circumference = 2pi*r = 6.28 * 0.34m = 2.14m/rev. Period = 2.14m/rev/(39m/s) = NOTE: you cannot use cm AND meters. Use 0.34m instead of 34cm to make your units compatible.

**Science**

Correct!

**Physics**

a = (V2-V1)/T. V1 = 84m/6s = 14 m/s = Initial velocity. V2 = 180m/5s = 36 m/s. T = t1 + t2 = 6 + s = 11s.

**Science**

I = E/R. The resistance remains constant. Therefore, the current increases when you increase the voltage(E).

**Physics**

M*g = 100. M = 100/g = 100/9.8 = 10.2kg = Mass of the box. Fn = 100 - 10*sin60 = 91.34 N. = Normal force Fap-Fk = M*a. 10*Cos60-Fk = 10.2*0, Fk = 10*Cos60 = 5 N. = Force of kinetic friction.

**discrete math**

a. P = Po + Po*r*t. P = 8000 + 8000*0.1*10 = $16,000 After 10 years. Amt. = $16,000/10yrs. = $1600/yr. b. Same procedure as part a. c. 1st. BAL. = (Po + I) - 2500. = (8000 + 0.2*8000) - 2500 = $7100. 2nd. BAL. = (7100 + 0.2*7100)-2500 = $6,020. 3rd. BAL = (6020 + 0.2*6020) - ...

**Math**

Mean = (76+73+78+75)/4 = 75.5 A quick way to calculate the mean is to take the difference between the largest and smallest number and divide it by 2; then add the results to the smallest number: (78-73)/2 = 2.5, 73 + 2.5 = 75.5.

**physics**

V = pi*r^2*h = 3.14*(1.05)^2*3.79 = 13.1m^3. Density = M/V = 13500kg/13.1m^3 = 1,028kg/m^3.

**physics**

20cm/step 12 steps?. d = 20 * 12 = 240cm. = 2.40m. P = F * d/t = Mg * d/t. P = 750 * 2.4/5 = 360 J/s = 360 Watts.

**Physics**

70 -30 = 40g = Wt. of paraffin. V = 40g/(0.8g/cm^3) = 50cm^3 = Vol. of bottle. Mass = 30 + (50cm^3*1g/cm^3) = 80g When filled with water.

**mechnical**

1. V1 = 9000rev/min * 1min/60s * 6.28rad/rev = 942.5 rad/s. V2 = 5500rev/min * 1min/60s * 6.28rad/rev. = 576 rad/s. a. a = (V2-V1)/t

**Physics pls help**

M1V1 + M2V2 = 24 + 10i sqrt(24^2+10^2) = 26kg.m/s = Total momentum before collision = Total momentum AFTER collision.

**physics**

Correction: E = 0.039 Volts.

**physics**

E = L*di/dt = (9*10^-3)*(1.5-0.2)/0.3 = 4.33 Volts.

**maths**

Total = 390 cm. Red = X cm. White = x+40 cm. Blue = 3x cm. Purple = (x+40)/2 = 0.5x+20. x + (x+40) + 3x + (0.5x+20) = 390. 5.5x + 60 = 390, X = 60 = Red. Calculate the length of the other ribbons.

**Math**

6,4,2,1,5,3. 5,3,1,6,4,2. 4,2,1,6,5,3. 3,1,6,5,4,3. 2,1,6,5,4,3.

**Math**

6,5,4,3,2,1. 6,4,3,2,1,5. 6,3,2,1,5,4. 6,2,1,5,4,3. 6,1,5,4,3,2. 5,4,3,2,1,6. 4,3,2,1,6,5. 3,2,1,6,5,4. 2,1,6,5,4,3. 1,6,5,4,3,2.

**Math**

1. 1,2,3,4,5,6. 1,3,4,5,6,2. 1,4,5,6,2,3. 1,5,6,2,3,4. 1,6,2,3,4,5.

**Math**

A. False. B. True. C. False.

**Math**

R = PL/A. P = 1.68*10^-8 Ohm*m. L = 3.9 m. r = 1.1*10^-3/2 = 5.5*10^-4 m. A = pi*r^2 = 3.14*(5.5*10^-4)^2 = 9.5*10^-7 m^2. R = 1.68*10^(-8)*3.9/(9.5*10^(-7)) = 0.069 Ohms.

**Algebra**

Eq1: 3x-3y+6z = 15 Eq2:-3x-6y+3z = -3(times-3). sum: =9y+9z = -18, y + z = -2. Eq2: -5x-10y+5z = -55(times-5). Eq3: +5x-8y+13z = 19 Sum: -18y+18z =-36, y - z = 2. y + z = -2. y - z = +2. Sum: 2y = 0, y = 0. z = -2. Eq1: 3x-3y+6z = 15. 3x - 3*0 + 6(-2) = 15, 3x = 27, x = 9. ...

**science**

2. Their forces are equal and opposite. 3. Unbalanced forced.

**physical sci**

Water vapor.

**math**

2005, Jamal: 21 + 3 = 24 yrs. old. a. 2005, Malcolm: 24/3 = 8 yrs. old. b. 8-3 = 5 yrs. old.

**physics**

k = (M2-M1)/(L2-L1) = (30-20)/(16-14) = 5 g/cm. d = 20g * 1cm/5g = 4cm = Distance stretched. Lu = 14-4 = 10cm = Un-stretched length.

**Math**

A. 50gal/Load * 52Loads = 2600 Gal. = 347.6 Ft^3. Cost = 347.6Ft^3 * 7.64/100 = B. (17.2/7.48)FT^3/day * 365days = 839.3 Ft^3. Cost = 839.3Ft^3 * 7.64/100Ft^3 =

**physics**

Incomplete.

**Math**

24/4 = 6 meals/day.

**maths**

d = 24*(T+5/60) = 1.25*24*(T-4/60). 24T + 2 = 30T - 2, T = 4/6 = 2/3 h. d = 24*(2/3+5/60) = ?.

**MATH**

Correction:314/(314+211+197+2243+279+325) = 0.20 Quota = 0.20 * 64 = 12.81.

**MATH**

Quota = 314/(314+211+197+243+279+325) = 12.81.

**math**

Incomplete.

**math**

I = Po*r*t = 6400*(0.0853/360)*40 = $60.66. Effective rate = (60.66/6400) * 100% = 0.95%.

**Trigonometry**

This is a rt. triangle: A = 0.5b*h = 0.5*6*8 = 24 Ft^2.

**Trigonometry**

Tan 57.68 = 50/D. D = ?.

**Trigonometry**

Tan =

**Trigonometry**

Y = 67 in. X = 67/2 = 33.5 in. Tan A = Y/X = 67/33.5 = 2.0 A = 63.43o.

**Math**

F = 700*SIN15 = 181.2 Lbs.

**Math**

a/sin A = b/sin B. a/sin43 = 10/sin112, a = ?.

**Math**

V1 = V2*1.42, V1 = (V1-20)*1.42, V1 = 67.7 Mi/h. d = V1*T1 = 67.7mi/h * 1h = 67.7 m1.

**Math**

d = V1*T1 = V2*T2. V1 * 1 = V2*(60+25)/60, V1 = V2*1.4

**science**

M1*d1 = M2*d2. M2 = 40 * 2 = M2 * 3.2, M2 = 25kg = Girl's wt.

**Physical Science**

P = I^2 * R.

**Geometry**

Find AX in the diagram if CX bisects angle ACB. And then there's a diagram below with triangle ABC, where X is on line C, BC=45, AC=21, and BX=30.

**MAth**

Disregard the first 2 lines.

**MAth**

Absent: X days. Worked: 28-x days. $9100/($500/day) =

**science**

Ans: C.

**algebra 2**

I1 = 10^6. I2 = 10^2*10^6 = 10^8. db(increase) = 10*Log(I2/I1). db(increase) = 10*Log(10^8/10^6) = 20.

**physics**

2c. Correction: 0 = 20^2 - 10d, d = 40 m.

**physics**

1. 72km/h = 72000m/3600s = 20 m/s. 2a. V2 = V1 + a*t. 0 = 20 + a*4, a = -5 m/s^2 = deceleration. 2b. F = M*a = 1200 * (-5) = -6000 N. The negative sign means the force opposes the motion. 2c. V2^2 = V1^2 + 2a*d. 0 = 20 - 10d, d = 2m.

**Math and science**

On the moon : M*g = 300 N. M*(9.8/6) = 300, M * 1.63 = 300, M = 183.7kg. On earth: Wt. = M*g = 183.7 * 9.8 = Or, On earth: 6 * 300 = 1800 N.

**mechanical principle**

Circumference = pi*d = 3.14 * 0.4 = 1.26 m. 1. Va = 8rev/20s * 6.28rad/rev = 2.51 rad/s. 2. V = 8rev/20s * 1.26m/rev = 0.502 m/s. 3. Va = Vo + a*t. 2.51 = 0 + a*20, a = 0.126 rad/s^2. 4. V = Vo + a*t. 0.502 = 0 + a*20, a = 0.025 /s^2.

**math**

P = 2h + 2W = 2*5.5 + 2*1.5 =

**Mathematics-Geomeotry PLEASE HELPPPPPP!!!!!!!**

AL = 2(W*h) + 2(L*h) = 624cm^2. 2(13*13) + 2(L*13) = 624, 338 + 26L = 624, L = 11 m. 1. Assuming the ends are square, W = h = 13 m. As = 2(L*W) + 2(L*h) + 2(W*h). 2. V = L*W*h.

**Mathematics-Geomeotry PLEASE HELPPPPPP!!!!!!!**

Correction: 1. As = 2(L*W) + 2(L*h) + 2(W*h).

**Mathematics-Geomeotry PLEASE HELPPPPPP!!!!!!!**

AL = 2(L*h) = 624cm^2. 2(L*13) = 624, L = 24cm. Assuming the ends are square, W = h = 13 cm. 1. As = 2(L*W) + AL. Or As = 2(L*W) + 2(L*h). 2. V = L*W*h.

**math**

P = Po + Po*r*t. P = 10,000 + 10,0000*(0.0825/365)*197 = 10,000 + 445.27 = $10,445.27. 3rd Payment = 10,445.27 - 6000 = $4,445.27.

**Physics**

NOTE: My vol. calculation was not required.

**Physics**

Vb = L*W*h = 12 * 12 * 6 = 864 cm^3. = Vol. of the block. Db/Dw * h = 600/1000 * 6cm = 3.6 cm submerged.

**Math**

b. 214 Ft. needed.

**Math**

a. L = 26 + 2*15 = 56 Ft. W = 21 + 2*15 = 51 Ft. P = 2L + 2W = 2*56 + 2*51 = 214 Ft. = Perimeter. Answer: 56ft by 51ft, 214ft.

**PHYSICS**

A. V = Vo + g*Tr. 0 = 40 - 9.8Tr, Tr = 4.08s = Rise time or time to reach max. ht. B. hmax = ho + Vo*Tr + 0.5g*Tr^2. hmax = 70 + 40*4.08 - 4.9*(4.08)^2 = 151.7 m. above gnd. C. Tf = Tr = 4.08 s. = Fall time. D. V = Vo + g*Tf = 0 + 9.8*4.08 = 40 m/s. E. h = ho - 0.5g*Tf^2. 0 = ...

**Math 11**

Y = a(x-h)^2 + k. 8 = a(6-5)^2 - 1, 8 = a - 1, a = 9. Y = 9(x-5)^2 - 1.

**Physics**

Correction: a. M = D*V = 6.5g/cm^3 * (20cm)^3 = 52,000g = 52kg.

**Physics**

So, the actual density is 6.5 times density of water: D = 6.5 * 1g/cm^3 = 6.5g/cm^3. a. M = D*V = 0.5g/cm^3 * (20cm)^3 = 4000g = 4kg. b. M = D*V. V = M/D = 3000g/(6.5g/cm^3) = 462 cm^3.

**Physics**

Vo = 1000/500 * 100 = 200 Volts. Po = Vo*Io = 200 * 4 = 800 Watts.

**Physics**

Ps = Pp = 120 * 0.1 = 12 Watts.

**physics**

See previous post: Mon, 4-10-17, 1:07 PM.

**physics**

Fb = M*g = 0.5 * 9.8 = 4.9 N. = Force of block. d = 4.9N/800N * 1m = 0.006125 m. = 0.6125 cm.