Friday
May 22, 2015

Posts by henry


Total # Posts: 10,618

Physics
d = Vx*Tf = 3 m. 0.5m/s * Tf = 3 Tf = 6 s. = Fall time. h = 0.5g*Tf^2 = 4.9 * 6^2 = 176.4 m.
March 6, 2015

Physics
h = 0.5g*t^2 = 7.5 4.9t^2 = 7.5 t^2 = 1.53 t = 1.24 s. = Fall time. d = Vx*t = 15m/s * 1.24s = 18.6 m.
March 6, 2015

physics
T = M*g + M*a
March 6, 2015

physics
Vo=1.65 rev/s * 6.28rad/rev=10.362 rad/s V=0.485rev/s * 6.28rad/rev = 3.05 rad/s a. a = (V-Vo)/t
March 6, 2015

Physics
d = V*t = 4800 m t = 4800/343 = 14 s.
March 5, 2015

Calculus, HELP!!
1) A rectangular page is to contain 24 square inches of print. The page has to have a 6-inch margin on top and at the bottom and a 1-inch margin on each side. Find the dimensions of the page that minimize the amount of paper used. 2) A cable runs along a wall from C to P at a ...
March 5, 2015

physics
d1 = V*t = 42m/s * 0.8s = 33.6 m. Head start for the speeder. d2 = d1 + 33.6 m. 20*t + 0.5*a*t^2 = 42*t + 33.6 20t+ 0.5*5*t^2 = 42t + 33.6 2.5t^2 -22t = 33.6 2.5t^2 - 22t - 33.6 = 0 Use Quadratic Formula. t = 10.13 s.
March 5, 2015

Physics
You gave your answer in miph/s. The problem says "give your answer in mph/s". Which one is correct? 1. a = (V-Vo)/t = (70-0)/3=23.3 miph/s. a = (99.2-0)/4 = 24.8 kmph/s. 2. a = 23.3miph/s * 1.6km/mi = 37.3 kmph/s. = acceleration of the cheetah. a = 24.8 kmph/s = ...
March 5, 2015

Physics
Eff. = (Output/Input)*100% =(230/420)*100 = 54.8%
March 4, 2015

Physics
Tension = M*g + M*a
March 4, 2015

physics
F = 97N - 107N[71.4] Fx = 97 - 107*Cos71.4 = 62.87 N. Fy = 0 - 107*sin71.4 = -101.4 N. a. F^2 = Fx^2 + Fy^2=62.87^2 + (-101.4^2) = 119.3 N. F = N. b. Tan A = Fy/Fx = -101.4/62.87 = -1.61285 A = -58.2o S of E = 301.8o CCW c. 107N[71.4o] - 97
March 4, 2015

Physics
Fg = M*g = 4 * 9.8 = 39.2 N. = Force of gravity. Fp = 39.2*sin30 = 19.6 N. = Force parallel to the incline. Fn = 39.2*Cos30 = 33.9 N. = Normal force a. W = Fg*d = 39.2 * 10 = 392 J. b. W = Fn*d = 33.9 * 10 = 339 J. c. d. h = d*sin30 = 10*sin30 = 5 m. KE = PE = Mg * h = 39.2 * ...
March 4, 2015

Physics
M*g = 70*10 = 700 N. = Wt. = Force of gravity(Fg). h = 31steps * 15m/step = 465 m. Work = F*h = Mg * h Joules.
March 4, 2015

Physics
M*g = 2.2 * 9.8 = 21.56 N. = Wt. of block. Fp = 21.56*sin27.7 = 10.02 N. = Force parallel to incline. Fn = 21.56*Cos27.7 = 19.09 N. = Normal force. Fk = u*Fn = 0.41 * 19.09 = 7.83 N. = Force of kinetic friction. a. a = (Fp-Fk)/M = (10.02-7.83)/2.2 = 0.995 m/s^2 b. L = h/sin27....
March 3, 2015

physics
M1*V1 + M2*V2 = M1*V + M2*V 5*3 + 5*0 = 5*V + 5*V Solve for v.
March 3, 2015

physics
V^2 = Vo^2 + 2g*h Vo = 24 m/s g = -9.8 m/s^2 h = 13 m. Solve for V.
March 3, 2015

math
P = Po(1+r)^n Po = $3,000 r = 1.8%/12/100% = 0.0015. n = 12Comp./yr. * 3yrs. = 36 Compounding periods. Solve for P.
March 3, 2015

physical science
V^2 = Vo^2 + 2g*d Vo = 0 g = +9.8 m/s^2 d = 80 m. Solve for V.
March 3, 2015

Physics
M1*V1 + M2*V2 = M1*V3 + M2*V4 M1 = M2? M1*4 + M1*0 = M1*3.46[30o] + M1*V4 Divide both sides by M1: M1*4 = M1*3.46[30] + M1*V4 4 = 3.46[30] + V4 V4 = 4 - 3.46[30] = 4 - 3 - 1.73i = 1-1.73i = 2.0m/s[300o] = Velocity of target ball.
March 3, 2015

physics
If an object weighs 480 N. on the earth, it's weight on the moon will be 480/6 = 80 N. How did you get 120 N.? The mass on the moon is the same as on earth.
March 3, 2015

trigonometric functions
h = 100*sin14 =
February 27, 2015

math
3 thousands, and 3 hundredths.
February 27, 2015

physics
F-200 = M*a F-200 = 350 * 3 = 1050 F = 1250 N.
February 27, 2015

3rd grade math
1/3 * 36 = 12.
February 27, 2015

math
3 thousands, and 3 hundredths.
February 26, 2015

science please help asap
See Related questions: 2-26-15, 11:06 AM.
February 26, 2015

Math
2. x + 4 > 6 3. x => 3C 4. x => $15
February 26, 2015

Physics
F = 392 + 2 = 394 Hz
February 26, 2015

Math
RQ = 2-(-2) = 4 = Hor. line RP = (2-(-1) = 3 = Ver. line, downward. Tan A = RQ/RP = 4/3 = 1.33333 A = 53.1o
February 26, 2015

maths
Cos A = 2m/9m.
February 26, 2015

math
Plate cost $X. A cup cost $2X. A pot cost $2X + 3 x + 2x + 2x+3 = $10.20 Solve for x.
February 26, 2015

physics
Circumference = pi*2r = 3.14 * 4,180 = 13,132 m. d = V*t d = 13,132 m. V = 233 m/s. Solve for t.
February 26, 2015

Physics mechanics
d = 60^2/30^2 * 8 = 4 * 8 = 32 m
February 26, 2015

science please help asap
2. M*g = 490 * 9.8 = 4802 N. = Wt. of the body. Fn = Mg-Fap*sin A = 4802-1200*sin20 = 4392 N = Normal force. Fx-Fs = M*a 1200*Cos20 - Fs = M*0 1128 - Fk = 0 Fk = 1128 N. = Force of kinetic friction u = Fk/Fn = 1128/4392 = 0.257 3A. F = M*a F = 318.1 N. a = 3 n/s^2 M = mass in ...
February 26, 2015

Physics
Work = F*d = Mg * d. Their wt. and distance was the same; therefore, they did the same amount of work.
February 26, 2015

science
See previous post.
February 25, 2015

physics
The force must be in the same direction as the motion(hor.). Work = Fx*d = 0 * 10 = 0
February 25, 2015

Physics
Work = Fx*d = 200*Cos30 * 20 = Answer in Joules.
February 25, 2015

Math
(-4,3), (h,k), (6,-5). The center = 1/2 of the total distance: h - (-4) = (6 - (-4))/2 h + 4 = 10/2 = 5 h = 1 k-3 = (-5-3)/2 Solve for k.
February 25, 2015

algebra
Sarita: X muffins. Clara: X muffins. Joe: X muffins. Clara: x-1 = 14 X = 15 Total = 3x = 3*15 = 45 muffins.
February 25, 2015

algebra
3x^2 + 3x - 6 = 0 A*C = 3*(-6) = -18 = -3*6 Choose the pair of factors whose sum = B = +3: -3, and 6. 3x^2 + (-3x+6x) - 6 = 0 Form two factorable binomials: (3x^2-3x) + (6x-6) = 0 3x(x-1) + 6(x-1) = 0 (x-1)(3x+6) = 0 (x-1)*3(x+2) = 0 x-1 = 0 X = 1 3(x+2) = 0 Divide by 3: x+2...
February 25, 2015

physics
V^2 = Vo^2 + 2a*d a = V^2/2d = 87^2/170 = 44.5 m/s^2. M*g = 219,000 N. M = 219000/g = 219000/9.8 = 22,347 kg F = M*a = 22,347 * 44.5 =
February 25, 2015

Physics
Incomplete.
February 25, 2015

Physics
V^2 = Vo^2 + 2a*d V = 64.1 m/s Vo = 0 d = 29.2 m. Solve for a. F = M*a M = 35.5 kg Solve for F.
February 25, 2015

physics
a. V^2 = Vo^2 + 2g*h = 0 Vo^2 = -2g*h = -(-19.6)*1.29 = 25.284 Vo = 5.03 m/s b. 0.5g*t^2 = 1.29 m. 4.9t^2 = 1.29 t^2 = 0.263 Tf = 0.513 s. = Fall Time. Tr = Tf = 0.513 s. = Rise time. Hang time = Tr + Tf = 0.513 + 0.513 = 1.026 s.
February 25, 2015

Algebra
Y = 3x^2 + 19x - 72 = 0 A*C = 3*(-72) = -216 = -8*27. Sum = 19 (3x^2-8x) + (27x-72) = 0 x(3x-8) + 9(3x-8) = 0 (3x-8)(x+9) = 0 3x-8 = 0 3x = 8 X = 8/3 x+9 = 0 X = -9 Solution: X = -9, and 8/3.
February 25, 2015

Physics
V = Vo + a*t = Vo = 0 a = 3m/s^2 t = 10 s. Solve for V.
February 25, 2015

physics
F = M * 3g = 63.6kg * 3*9.8N/kg =
February 25, 2015

Science
a. PE max = Mg*h = 59*9.8*24 = 13,877 J. b. KE + PE = PE max = 13,877 J.
February 25, 2015

math
$X in account. x-30 = 3x/4 4x-120 = 3x X = $120
February 25, 2015

physics
V^2 = Vo^2 + 2a*d a = (V^2-Vo^2)/2d V = 0.63 m/s Vo = 0 d = 0.45 m. Solve for a. F = M*a M = 69 kg Solve for F.
February 25, 2015

Math SO HARD :C
T + 8 = -20 T = -20-8 = -28o C @ Midnight.
February 25, 2015

physical science
Correct.
February 25, 2015

Physics
I = V/R = 9/230 = 0.0391 Amps = 39.1 mA.
February 25, 2015

Algebra 1
Multiply Eq1 by -2 and add: -10x - 2y = -18 +10x - 7y = 18 Sum: 0 - 9y = 0 Y = 0 In Eq1, replace Y with 0 and solve for X -10x - 2*0 = -18 X = 1.8
February 24, 2015

maths
X pizzas 4X Drinks 12x + 0.5*4x = 112 Solve for X.
February 24, 2015

physics
Thank you Damon! I think I understand what you meant when I read your post My triangle was correct though, yes? I just referred to them wrong?
February 24, 2015

physics
Wait that's not how it's supposed to look. Ok
February 24, 2015

physics
How do I know which trig function to use? I made my second triangle like this _____ \ | \ | \ | \|
February 24, 2015

physics
Why did you swap Betas trig functions?
February 24, 2015

physics
What do you mean, I did indicate on the question that it was west of north?
February 24, 2015

physics
A golfer takes two putts to sink the ball, one is (81.6 ft, 31.7 degrees N of E) and the other is (3.20 ft, 53.4 degrees W of N). What is the displacement of the single putt that would sink the ball on the first try? Well, what I did was make a diagram of the two vectors, I ...
February 24, 2015

Science
M*g = 90 N. M*9.8 = 90 M = 9.18 kg Density = 9.18kg/45mL = 0.204 kg/mL Note: A 90-N. object has a mass of 9.18 kg or 9,180 grams.
February 24, 2015

Finance
V = Vo(1+r)^n r = 5%/365/100% = 0.00013699 = Daily % rate expressed as a decimal. n = 365Comp./yr * 11Yrs = 4015 Compounding periods. V = 10,000(1.00013699)^4015 = $17,332.13
February 24, 2015

Physical science
Fp = Mg*sin35 = 315 Mg = 315/sin35 = 549 N. = Force of gravity. Fn = Mg*Cos35 = 549*Cos35 = 450 N. = Normal force.
February 24, 2015

Physics
d = 42m1[135o] - 34mi[270o] X = 42*Cos135 = -29.7 mi Y = 42*sin135 - 34*sin270 = 63.7 mi. Tan A = Y/X = 63.7/-29.7 = -2.14473 A = -65o = 65o N. of W. = 115o, CCW. d = Y/sin A = 63.7/sin 115 = 70.3 mi. d = V*t = 70.3 V = 70.3/t = 70.3/0.5h = 140.6 mi/h
February 24, 2015

Physics
Vp = -250m/s + i25m/s, Q2. Tan A = Y/X = 25/-250 = -0.10000 A = -5.71o = 5.71o N. of W.= 174.3o,CCW Vp = X/Cos A = -250/Cos(174.3)=251 m/s
February 23, 2015

Physics
V = Vo + a*t = 31m/s[30o] Vo - 4*4 = 31*Cos 30 + i31*sin 30 Vo - 16 = 26.8 + 15.5i Vo = 42.8 + 15.5i Tan A = Y/X = 15.5/42.8 = 0.36215 A = 19.91o Vo = 42.8/Cos 19.91 = 45.5m/s[19.9o] = Initial velocity.
February 23, 2015

physics
d = V*t = 2*0.3 km = 0.6 km 216 * t = 0.6 t = (0.6/216) h. t = (0.6/216)h * 3600s./h = 100 s. Note: The sound travels 600m(0.6km).
February 23, 2015

science
C.
February 23, 2015

Physics
1. M*g = Wt. of roller. Fp = Mg*sin 30 = 2500 Mg = 2500/sin 30 = 5000 N. M = 5000/g = 5000/9.8 = 510.2 kg 2. Fn = Mg*Cos 30 = 5000*Cos 30 = 4330 N = Normal force = Force exerted by the surface.
February 23, 2015

Physics
sin23.3 = h/0.7 h = 0.7*sin 23.3 = 0.277 m. h = 0.5g*t^2 h = 0.277 m. g = 9.8 m/s^2 Solve for t.
February 23, 2015

physics
Incomplete, and too many errors.
February 23, 2015

Math Vectors
Vr = 400km/h[200o] + 100km/h[225o] X = 400*Cos200 + 100*Cos225 = -447 km/h Y = 400*sin200 + 100*sin225 = -208 km/h Tan Ar = Y/X = -208/-447 = 0.46532 Ar = 25o = Reference angle. A = 25 + 180 = 205o (Q3). V = X/Cos A = -447/Cos205 = 493 km/h. = Resultant velocity.
February 22, 2015

Math
a. Range = Vo^2*sin(2A)/g Range = 1200 Ft. Vo = 500 Ft./s. g = 32 Ft/s^2 Solve for A. b. V^2 = Vo^2 + 2g*h h = -Vo^2/2g Vo = 500 Ft./s. g = -32 Ft./s^2 Solve for h
February 22, 2015

math
Isaiah: X cards. x-x/9 = 560/2 8x/9 = 280 8x = 2520 X = 315 560 - 315 = 245 More than Andy.
February 22, 2015

math
X = 5 km/h Y = -3 km/h i. Speed = Sqrt(X^2+Y^2) = sqrt(5^2+3^2)= 5.83 km/h = 1.62 m/s. b. Tan A = Y/X = -3/5 = -0.60 A = -31o = 31o S. of E. d = 30m/Cos(-31) = 35 m. = Distance to cross. d = V*t = 35 m. t = 35/V = 35/1.62 = 21.6 s.
February 21, 2015

Physics
E = 58.0 Volts 1/Ct = 1/C1 + 1/C2 + 1/C3 1/Ct = 1/3.83 + 1/5.89 + 1/12.9 = 0.5084 Ct = 1.97 uF. Qt = Q1 = Q2 = Q3. Qt = Ct*E = 1.97 * 58 = 114.1 uC Q1 = C1*V1 = 114.1 uC V1 = 114.1/3.83 = 29.8 Volts.
February 20, 2015

physics
Mc = 14 kg = Mass of cart Md = Mass of dog food. d = 0.5a*t^2 = 2.30 m. 0.5a*2.55^2 = 2.3 3.25a = 2.3 a = 0.707 m/s^2. F = M*a M = F/a (Mc+Md) = F/a F = 12 N. a = 0.707 m/s^2 Solve for Md.
February 20, 2015

math
a. A = 4.1m * 2.2m = 9.02 m^2. A max = (4.1+0.01) * (2.2+0.01) = A min. = (4.1-0.01) * (2.2-0.01) = 8.957 m^2.
February 20, 2015

Math
X+X = 2x = Total bought. Red Tulips: x-24 Yellow: 4(x-24) 2x-24 Tulips remaining. x-24 + 4(x-24) = 2x-24 x-24 + 4x-96 = 2x-24 3x = 120-24 = 96 X = 32 2x = 64
February 20, 2015

Algebra 2
W^2 + 5W = 36 W^2 + 5W - 36 = 0
February 20, 2015

physics
Bill, please clarify your problem by adding the missing words.
February 19, 2015

Physics
Circumference = pi*Dia = 3.14 * 32.6cm = 102.4 cm = 1.024 m. Vo = 247rev/60s. * 1.024m/rev=4.22 m/s. V = 378rev/60s * 1.024m/rev = 6.45 m/s. V = Vo + a*t V = 6.45 m/s Vo = 4.22 m/s t = 6.54 s. Solve for a. d = Vo*t + 0.5a*t^2
February 19, 2015

physics
See previous post: Thu, 2-19-15, 6:56 PM.
February 19, 2015

Math
See previous post: Thu, 10-23-14, 6:36 PM.
February 19, 2015

physics
A shorter method: R1 = 100 Ohms R2 = 449 Ohms Ri = Internal resistance. V1 = I1*R1 = 4 * 100 = 400 Volts. V2 = I2*R2 = 1.09 * 449 = 489.41 Volts. Ri = (V2-V1)/(I1-I2) = (489.41-400)/(4-1.09) = 30.73 Ohms. E = I1*R1 + I1*Ri = 400 + 122.9 = 522.9 Volts.
February 19, 2015

physics
E = Battery terminal voltage(e.m.f.). Ri = Internal resistance. R1 = 100 Ohms. R2 = 449 Ohms. I*R1 + I*Ri = E 4*100 + 4*Ri = E Eq1: -E + 4Ri = -400 I*R2 + I*Ri = E 1.09*449 + 1.09*Ri = E Eq2: -E + 1.09Ri = -489.41 Subtract Eq2 from Eq1: Eq1: -E + 4Ri = -400 Eq2: -E + 1.09Ri...
February 19, 2015

physics
V = 4.93revs/1.47s * 6.28rad/rev = 21.1 rad/s = Angular velocity. V = Vo + a*t V = 21.1 rad/s. Vo = 0 t = 1.47 s. a = rad/s^2 Solve for a.
February 19, 2015

Math 222
g^2 - 6g - 55 = 0 -55 = 5*(-11) g+5= 0 g+(-11) = 0 g-11 = 0 (g+5)(g-11)= 0
February 19, 2015

physics
Vo = 20m/s[40o] Xo = 20*Cos40 = 15.32 m/s. Yo = 20*sin40 = 12.86 m/s. a. Y^2 = Yo^2 + 2g*h Y = 0 Yo = 12.86 m/s. g = -9.8 m/s^2 Solve for h. b. Y = Yo + g*Tr Y = 0 Yo = 12.86 m/s. g = -9.8 m/s^2. Solve for Tr.(Rise time or time to reach max. ht.) c. V = Xo + Yi = Xo + 0 = Xo d...
February 19, 2015

physics
a. V = Vo + a*t V = 25.1 m/s Vo = 0 t = 0.48 s. Solve for a. b. F = M*a M = 910 kg a = Value calculated in part a.
February 19, 2015

Chemistry
Human bodies maintain their balance (homeostasis) through a series of equilibria. An important equilibrium involves calcium ion because Ca2+ is important for muscle contractions in the heart as well as for strong bones. Bone is a complex tissue consisting of living cells and ...
February 19, 2015

Chemistry
A 500.0 mL sample of saturated nickel(II) phosphate solution was analyzed spectrophotometrically and found to contain 1.88 × 10-5 g of nickel. (a) Determine the molarity of the nickel(II) phosphate solution. (b) Calculate the solubility product constant, Ksp for nickel(...
February 19, 2015

Chemistry
The solubility of insoluble substances changes depending on the nature of the solution. Below are two solutions in which Cu(OH)2 is dissolved; in each case, the solubility of Cu(OH)2 in those solutions is not the same as it is in pure water. (a) For each Cu(OH)2 solution below...
February 19, 2015

Physics
See previous post: 9-16-13, 8:40 PM.
February 18, 2015

physics
T^2 = 4pi^2*(L/g) L/g = T^2/4pi^2 = 4.17^2/39.5 = 0.440 0.75/g = 0.44 g = 0.75/0.44 = 1.70 m/s^2. It is on the moon!
February 18, 2015

physics
a. T = 2min/60cycles = 120s/60cycles = 2s/cycles b. F = 1/T = 1cycle/2s. = 0.50 cycles/s. = 0.50 Hz.
February 18, 2015

science
B.
February 18, 2015

physical science
T = 50km * 1h/5km * 60min/h = 600 min.
February 18, 2015

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