# Posts by Henry

Total # Posts: 13,636

geometry
Correction: apothem = s/2*Tan(180/n). 5 = S/2*Tan(180/3), S = 17.32 cm. P = 17.32 + 17.32 + 17.32 = 52 cm.

geometry
All of the angles are equal: A = B = C = 180/3 = 60o. All of the sides are equal: a = b = c. h = 5 cm, sin60 = h/a = 5/a, a = 5/sin60 = 5.77 cm. P = a + b + c = 5.77 + 5.77 + 5.77 = 17 cm.

Physics
h = 0.5g*t^2. 0.8 = 4.9t^2, t = 0.404 s. To reach gnd. d = 5m/s * 0.404s. = 2.02 m. From base of table.

Physics
Vo = a*t = 3 * 60 = 180 m/s. V^2 = Vo^2 + 2g*h. 0 = 180^2 - 19.6h, h = 1653 m. Above gnd. h = 0.5g*t^2. 1653 = 4.9t^2, t = 18.4 s. To reach gnd. V = Vo + g*t = 0 + 9.8*18.4 = 180 m/s.

physics
See previous post: Sun, 9-18-16, 6:50 PM.

Physics
M*g = 20 * 9.8 = 196 Newtons.

Physics
V^2 = Vo^2 + 2a*d. 5^2 = 20^2 + 2a*25. 2a*25 = -375, a = -7.5 m/s^2. V = Vo + a*t. 5 = 20 - 7.5t, t = 2 s.

physics
Energy = 1.25kW * (6.5/60)h = 0.135 kWh.

physics
F = 1.8C + 32.

Physics
See previous post.

Physics
5.1m = 1/2 of h max. hmax = 10.2 m.

Physics
V^2 = Vo^2 + 2g*h. 10^2 = 0 + 19.6h, 19.6h = 100, h = 5.1 m.

physics
See previous post: Thu, 9-15-16, 10:47 PM.

Physics
X = 3.17 - 1.49 = 1.68 m. Y = -4.49 - (-2.83) = -1.66 m. d = Sqrt(X^2+Y^2) = Sqrt(1.68^2+1.6^2) = 2.36 m. V = d/t = 2.36m/325s = 0.00727m/s.

Physics
Vo = 45,000m/3600s = 12.5 m/s. If she tries to stop: V^2 = Vo^2 + 2a*d. 0 = 12.5^2 - 2*5.8*d. 11.6d = 156.25, d = 13.5 m. To stop. Therefore, she should stop the car.

Physics
1. Range = Vo^2 * sin(2A)/g. 7.73 = Vo^2 * sin(54.2)/9.8. 7.73 = Vo^2 * 0.0828, Vo^2 = 93.4, Vo = 9.66 m/s. Range = (9.66*1.03)^2 * sin(54.2)/9.8 =

MATH
32,800 - 0.2*32,800 = 26,240/mo. Remaining. Bank = 0.25 * 26,240 = 6,560/mo. Other Expenses = 0.75 * 26,240 = 19,680/mo.

physics
V^2 = Vo^2 + 2g*h = 15.3^2 + 19.6*4.40 = 320.33, V = 17.9 m/s.

Physics
Range = Vo^2*sin(2A)/g. 4.22 = Vo^2*sin(24.8)/9.8. 4.22 = Vo^2*0.0428, Vo^2 = 98.6, Vo = 9.93 m/s.

physics
Fr = 415[-20o] + 470[50o]. Fr = (415*Cos(-20)+470*Cos50) + (415*sin(-20)+470*sin50). Fr = (390+302) + (-142+360)i. Fr = 692 + 218i = 726N[17.5o]. Fr = M*a; a = Fr/M = 726[17.5]/290 = 2.50m/s^2[17.5o].

Algebra II
d = 44g.

algerbra help plzzz
I found NONE.

physics
1. V^2 == Vo + 2g*h = 0; Vo = -2g*h = 19.6*10 = 196 m/s. = Initial velocity. V = Vo + g*Tr = 0; Tr = -Vo/g = -196/-9.8 = 20 s. = Rise time. Tf = Tr = 20 s. Tr+Tf = 20 + 20 = 40 s. = Time in air. 2. Vo = 196 m/s(Part 1).

pre algebra 8th grade(0, 0.3), (1, 0.5), (2, 0.7),
Please ignore the 3 points preceding my name.

pre algebra 8th grade(0, 0.3), (1, 0.5), (2, 0.7),
Y = mx + b, Y = 0.2x + 0.3. When y = 0, x = -1.5. X-int. When x = 0, y = 0.3. Y-int. When x = 5, y = 1.3. P1(-1.5,0), P2(0,0.3), P3(5,1.3). Use the above points for graphing.

Physics
V = 68km/h = 68000m/3600s = 18.9 m/s. d = v*t + 0.5a*t^2. d = 18.9*0.75 - 0.5*5.5*0.75^2 = 12.6 m.

science
F = M*a.

Math
S = 44; Not 4. h = -16t^2 + 64t + 44 = 64. Divide both sides by 4: -4t^2 + 16t + 11 = 16, -4t^2 + 16t -5t = 0, Use Quadratic Formula: t = {-16 +- Sqrt(256-80))/-8, t = (-16 +- 13.3)/-8 = 0.342, and 3.66 Seconds. t = 3.66 seconds.

Physics
a. D = 1.13km[0o] + 1.01km[270o] + 3.95km[130.2o] = (1.13+3.95*Cos130.2) + (1.01*sin270+3.95*sin130.2)i = -1.42 - 1.009i = 1.74km[35.4o W. of S.]. b. D/t = 1.74km[35.4o W. of S.]/1.966h = 0.885km/h[35.4o W. of S.].

science
What is the previous question?

Physical science
V = Vo + a*t = 40, Vo - 6*1.5 = 40, Vo = 49 m/s.

Physics (Help Plz)
1. d = r*t1 = 2.5, 3.5 * t1 = 2.5, t1 = 0.714 Hours. r*t2 = 2.5, 8 * t2 = 2.5, t2 = 0.3125 Hours. Average Speed = 5/(t1+t2). 2. 3.5 * 0.5t + 8 * 0.5t = 5, 5.75t = 5, t = 0.870 Hours. 3. Average Speed = 5/t.

ENGLISH
RIDDLE:My weakness and fame equals

physic
A. Ha = Hb, ho-0.5g*t^2 = ho-(Vo*t + 0.5g*t^2). 17 - 4.9t^2 = 23.5 - (7.36*t + 4.9t^2. 17 - 4.9t^2 = 23.5 - 7.36t - 4.9t^2. -4.9t^2 + 4.9t^2 + 7.36t = 23.5-17. 7.36t = 6.5, t = 0.883 s. h = 17 - 4.9*(0.883)^2 = 13.2 m. Above gnd. B. Va = Vo + g*t = 0 + 9.8*0.883 = 8.65 m/s. Vb...

Physics
d = 8.5m/s * 240s =

physics
Correction: V = Xo + Yi = 250 - 207i = 325Ft/s[-39.6o].

physics
Vo = 500Ft/s[60o]. Xo = 500*Cos60 = 250 Ft/s. Yo = 500*sin60 = 433 Ft/s. Y = Yo + g*Tr = 0, 433 - 32Tr = 0, Tr = 13.53 s. Rise time. h = Yo*t + 0.5g*t^2. h = 433*20 - 16*20^2 = 2260 Ft. and falling. Y = Yo + g*t = 433 - 32*20 = -207 Ft/s = 207 Ft/s, Downward. V = Xo + Yi = 250...

Physics
d = 25m/s * 50s =

Physics
A. See previous post: Thu, 9-8-16, 8:11PM.

Physics
Speed = 80m/5s = 16 m/s. A. See previous post.

physics
105mi/h * 5,280Ft/mi * 1h/3600s = 154 Ft/s. d = r*t = 43, 154*t = 43, t = ?.

physics
D = 5 + 7[-45o] = (5+7Cos(-45)) + (7*sin(-45))I = 9.95 - 4.95i = 11.11mi[-26.4o] = 11.11mi[26.4 S. of E.].

PHYSICS
Fr = (5[30o] + 5[0o] = (5*Cos30+5) + (5*sin30)I = 9.33 + 2.5i = 9.66[15o].

Physics
V = 1[90o] + 4[225o]. V = (1*Cos90+4*Cos225)+(1*sin90+4*sin225)I = (0+2.83) + (1-2.83)I = 2.83 - 1.83i = 3.37n[-32.9o] = 3.37n[32.9o S. of E].

profit and loss
P/150 = 0.20, P = \$30.

math
a. 1. i345 = 345i. 2. 32/-5i = 32*5i/(5i*5i) = 160i/25i^2 = 160i/-25. 3. 6/(7-8i) = 6*(7+8i)/(7-8i)(7+8i) = 42+48i/(49+56i-56i-64i^2) = 42+48i/(49+64) = 42+48i/113. 4. 9/(-8+7i). Use same procedure as part 3 and remember that i^2 = -1.

math
a. F = 44N[54o] + 77[90] + 60[146] + 88[245]. X = 44*Cos54+77*Cos90+60*Cos146+88*Cos245 = Sum of hor. components. Y = 44*sin54+77*sin90+60*sin146+88*sin245 = Sum of ver. components. Tan A = Y/X, A = ? Resultant = X/Cos A or Sqrt(X^2+Y^2).

Math
d = 20mi/h * xh = 20x miles. d = (20-4)mi/h * xh + 6 = 20x 16x + 6 = 20x, X = 1.5 Hours. d = 20 * 1.5 = 30 Miles from nest. Dt = 2 * 30 = 60 Miles. = Total distance traveled. d = V*t = 30, 20*t1 = 30, t1 = 1.5 Hours. 16*t2 = 30, t2 = 1.875 Hours. t1+t2 = 1.50 + 1.875 = 3.375 ...

math
\$X invested in 1st acc. (10,000-x) invested in 2nd acc. I = I1 + I2 = X*r1*t + (10,000-x)*r2*t = 575. X*.05*1 + (10,000-x)*.06*1 = 575. X = ?.

math
One bro. owned \$X. The other bro. owned \$3x/7. X + 3x/7 = 1,260,000. Multiply both sides by 7 and solve for X.

Physics
I need to know the direction(angle) of each vector.

math

math
See previous post.

math
See previous post: Wed., 9-7-16, 3:18 AM.

math
a. Tan35 = h/(d+30), h = (d+30)Tan35). Tan55 = h/d, h = d*Tan55. (d+30)Tan35 = d*Tan55. (d+30)0.7 = 1.43d, d = ? b. h = d*Tan55.

Physics (College)
d = 2 * 12.8 = 25.6 km. t = (21+13)/60 = 0.567h. Speed = d/t = 25.6km/0.567h = 45.2 km/h.

Physics
d 26mi * 1.6km/mi = 41.6 km. t = 2h + (6/60)h + (32/3600)h. t = 2 + 0.1 + 0.00889 = 2.109h. Speed = d/t = 41.6km/2.109h = 19.73 km/h.

Physics
D1/D2 = (1/2)/(2/3) = 1/2 * 3/2 = 3/4.

Physical Science
h = 0.5g*t^2 = 4.9*0.8^2 =

math
X girls in the class. (53-x) boys in the class. 5x/7 + 3/5(53-x) = 35. 25x + 21(53-x) = 1225. 25x + 1113-21x = 1225. 4x = 112, X = 28. 53-28 = 25 Boys in the class.

math
35 fish in smaller tank. X fish in larger tank. 5/7(x-15) = 35+15 = 50. 5(x-15) = 350, 5x - 75 = 350, X = 85.

math
See previous post: Sat 9-3-16, 1:43 PM.

math
P = Po(1+r)^n. Po = \$25,000. r = 0.06/12mo. = 0.005/mo. n = 1Comp./mo. * 12mo. = 12 Compounding periods. t = 12 mo. P/t = Monthly payment.

Math
X Boys in the class. Y Girls in the class. 3x/4 + 2y/3 = 30, Multiply by 12: Eq1: 9x + 8y = 360. x/4 + y/3 = 42-30 = 12, Multiply by 12: Eq2: 3x + 4y = 144. Multiply Eq2 by -3 and add: 9x + 8y = 360 -9x - 12y = -432 Sum: -4y = -72, Y = 18. 3x + 4*18 = 144, X = 24.

Math
Remainder = 13/13 - 7/13 = 6/13. Next-to oldest share = 2/3 * 6/13 = 12/39. Youngest bro. share = 13/13-7/13-12/39 = 39/39-21/39-12/39 = 6/39 = 2/13. 2/13 * x = 6.00, X = \$39. = Sum of money shared.

profit and loss
Profit = 0.1 * 100 = \$10. 0.1x = 20, X = \$200 = New selling price.

PHYSICS CLASS 9
V^2 = Vo^2 + 2a*d. Vo = 40km/h = 40,000m/3600s = 11.11 m/s. V = 0, a = -0.6m/s^2, d = ?.

MATH
80in * 1cm/48in =

math
r = 0.05/52.

algebra
(2-x)/(2+x). A fraction is equal to zero only when the numerator equals zero: 2-x = 0, X = 2.

math
3.96*10^2/1.5*10^6 = 2.64*10^-4.

Math
A craft project requires 5/6 yards of ribbon to make 4 refrigerator magnets.How many inches of ribbon are needed for each magnet?

Physics
d = 300 + 400 m. = 700 m.

math
P1 = Po(1+r)^n. r = 0.04/365 = 0.0001096/day. n = 365Comp./yr. * 2yrs. = 730 Compounding periods. P1 = 1000(1.0001096)^730 = \$1083.28. P2 = Po(1+r)^n. Po = P1 = 1083.28. r = 0.045/365 = 0.0001233. n = 365Comp./yr. * 3yrs = 1095 Compounding periods. P2 = Value after 3 yrs. = ?.

math
P = Po(1+r)^n. P = \$10,000. Po = Initial deposit = ?. r = 0.06/12 = 0.005 = Monthly % rate. n = 12Comp./yr. * 5yrs. = 60 Compounding periods.

Science
PE = KE, Mgh = 0.5M*V^2, g*h = 0.5V^2, V^2 = 2*g*h = 19.6*10 = 196, V = 14m/s. Momentum = M*V = 50 * 14 = 700 kg-m/s.

Physics
d = Xo*t = 1.94, 4.8 * t = 1.94, t = 0.404 s. h = 0.5g*t^2 = 4.9 * (0.404)^2 = 0.80 m.

MATH
150/450 = 1/3.

physics
Vt = 72,000m/h = 72,000m/3600s = 20 m/s. 1. Fp = (Vs+Vp)/(Vs-Vt) * Ft. Fp = (343+0)/(343-20) * 600 = 637 Hz. 2. Fp = (343+0)/(343+20) * 600 = 567 Hz.

Science
a. V = 16m/2s = 8 m/s. b. V = 8m/s * 1km/1000m * 3600s/h = 28.8 km/h.

Physics
a. d1 = 3.65-1.55 = 2.10 m. = Distance the shield must travel. V^2 = Vo^2 + 2g*d2 = 0. 2g*d2 = -Vo^2, d2 = -Vo^2/2g = -(7.4)^2/-19.6 = 2.79 m. Yes. b. V^2 = 7.4^2 - 19.6*2.10 = 13.6, V = 3.69 m/s. 7.4 - 3.69 = 3.71 = Change in speed. c. V^2 = 7.4^2 + 19.6*2.1 = 95.92, V = 9.79...

Physics
A. V = Vo + g*t. V = 0, Vo = 50/Ft/s, g = -32.2 F/s^2, t = ?. B. h = Vo*t + 0.5g*t^2. t = Value calculated in part A. C. V^2 = Vo^2 + 2g*h. V = 25 Ft/s, Vo = 50 Ft/s, h = ?.

physics
If half life of iodine 131 is 8 days, how much from 32g remain after 40 days (5 half lives).

physics question
h = 29*sin17 = 8.48 m. = ht. of the incline. V1^2 = Vo + 2g*h = 0 + 19.6*8.48 = 166.2, V1 = 12.9 m/s[17o] = Velocity at bottom of the incline. X1 = 12.9*Cos17 = 12.3 m/s. Y1 = 12.9*sin17 = 3.77 m/s. Y2^2 = Y1^2 + 2g*h = 3.77^2 + 19.6*55 = 1092.2, Y2 = 33 m/s. = Final velocity...

physics question
All angles are measured CCW from +x-axis. D = 10[45o] - 12i + 8[150o]. D = 7.07 + 7.07i - 12i - 6.93 + 4i = 0.14 - 0.93i = 0.94mi[-81.4] = 0.94mi[278.6o].

physics math
Vo = 40m/s[30o]. Xo = 40*Cos30 = 34.64 m/s. Yo = 40*sin30 = 20 m/s. V = (34.64x + 20.00y)m/s.

physics math
Vo = 30m/s[60o]. Xo = 30*Cos60 = 15 m/s. Yo = 30*sin60 = 26 m/s. Y = Yo + g*t = 26 - 9.8*5 = -23 m/s. V^2 = 15^2 + (-23)^2 = 754, V = 27.5 m/s.

Biology

Math
Deposit = \$5.00. End of 1st month = 5*2^1 = \$10. End of 2nd Month = 5*2^2 = \$20. End of 3rd Month = 5*2^3 = \$40. End of 8th Month = 5*2^8 = \$1280.

math
A. Y = (x+200) + (x+200)*0.05*5. B. Y = x + x*0.045*6.

physics
D = -4 + 6i + 6 = 2 + 6i. D^2 = 2^2 + 6^2 = 40, d = 6.32 Blocks.

physics
The system is in Equilibrium. The sum of all hor. forces = 0: T1*Cos(180-35) + T2 = 0. -0.819T1 = -T2, T1 = 1.22T2. The sum of all vert. forces = 0: T1*sin(180-35) + (-5) = 0, 0.574T1 = 5, T1 = 8.72 kg. 1.22T2 = 8.72, T2 = 7.15 kg.

Math
9 - 2 X = -4. 9 - 2(4x+5) = 9 - 2(- 16+5) = 31.

Math

Math
(3.14/8)/(6.28) * 360 = 22.5o = Angle of elevation. Tan22.5 = (160-100)/d = 60/d, d = ?.

Math
8 Chocolate, 12 Banana, 16 Strawberry, and 20 Blueberry muffins. Note: Each number is increased by 4.

math
(3+x)*(5+x)*8 = 120+34. (3x+15 + x^2+5x)*8 = 154, (x^2+8x+15)*8 = 154, 8x^2 + 64x + 120 = 154, 8x^2 + 64x - 34 = 0, Use Quad. Formula: X = (-64 +- Sqrt(4096+1088))/16 X = (-64 +- 72)/16 = 0.50 cm, or X = - 8.50 cm.(Not valid). Solution: X = 0.50 cm. added. New Dimensions = 3....

science
Fg = 1/6 * 9.8 = 1.63 m/s^2.

Physics
Incomplete.

math
12,000 - (1/12)*12,000 = 12,000 - 1,000 = \$11,000. 11,000 - (1/2)*11,000 = 11,000 - 5,500 = \$5,500 = Remaining salary.