Saturday

September 24, 2016
Total # Posts: 12,041

**Math**

Thank you bobpursley

*September 22, 2016*

**Math**

Use the clue bellow to find the mystery number: - The mystery number has 3 digits - The sum of the digits in the mystery number equals 16 - The mystery number is greater than 800 and less than 825 - All digits in the mistery number are even.

*September 22, 2016*

**physics**

Vo =3.80 m/s[30o]. Xo = 3.8*Cos30 = 3.29 m/s. Yo = 3.8*sin30 = 1.9 m/s. Y = Yo + g*Tr. 0 = 1.9 - 9.8Tr, Tr = =.194 s. = Rise time. Tf = Tr = 0.194 s. = Fall time. d = V*(Tr+Tf) = 1.4 * 0.388 = 0.543 m.

*September 22, 2016*

**Physics**

Xo = 18 m/s. = Hor. velocity. h = o.5g*t^2. 123 = 4.9t^2, t = 5.01 s. to reach gnd. d = Xo*t = 18 * 5.01 = 90.2 m.

*September 22, 2016*

**Physics**

d = 4 * 50 = 200 m. Disp. = 0, The distance from starting point.

*September 22, 2016*

**physics**

V = -2.55 + 0.440 + x. -1.33 = -2.11 + x, X = 0.78 m/s Due East. d = V*T, 6440 = (-1.33)*T, T = -4842 s. = 4842 s., West. 0.78m/s * 4842s. = 3777 m., East.

*September 22, 2016*

**Measurement - Distance**

T1 = 10:30 - 8:00 = 2.5 b. d1 = V1*T1 = 75 * 2.5 = 187.5 km. d2 = V*T, (525-187.5) = 80*T, T = 4.22 h. For Chad to reach B. D1 = (525-187.5) - 75*4.22. D1 = 337.5 - 316.5 = 21 = Dist. Michael still need to travel.

*September 22, 2016*

**Physics**

1. V = Vo + a*t. 15 = 0 + a*5 a = 3 m/s^2. 2. V = Vo + a*t. 0 = 15 - 5*t, t = 3 s. 3. d1 = Vo*t + 0.5a*t^2. Vo = 0, t = 5, a = 3 m/s^2, d1 = ?. d2 = Vo*t. Vo = 15 m/s, t = 15 s, d2 = ?. V^2 = Vo^2 + 2a*d3. V = 0, Vo = 15 m/s, a = -5 m/s^2, d3 = ?. d1+d2+d3 = Total dist.

*September 21, 2016*

**physics**

Vo = 120Ft/s[37o]. Xo = 120*Cos37 = 95.85 Ft/s. Yo = 120*sin37 = 72.22 Ft/s. a. Y = Yo + g*Tr. 0 = 72.22 - 32Tr, Tr = 2.26 s. = Rise time. Tf = Tr = 2.26 = Fall time. Tr+Tf = 2.26 + 2.26 = 4.52 s. = Time in air. b. h = Yo*Tr + 0.5g*Tr^2. h = 72.22 - 16*2.26^2 = 81.5 Ft. c. d...

*September 21, 2016*

**Physics**

V^2 = Vo^2 + 2a*d. Vo = 0, a = 3.6 m/s^2, d = 61 m., V = ?.

*September 20, 2016*

**math**

Tan17 = 30/d, d = ?

*September 20, 2016*

**Math**

a. V = -1.5 + 10 = 8.5 m/s, East. b. V = 2.1 + 15 = 17.1 m/s, East.

*September 20, 2016*

**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.

*September 20, 2016*

**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.

*September 20, 2016*

**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.

*September 20, 2016*

**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.

*September 19, 2016*

**physics**

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

*September 18, 2016*

**Physics**

M*g = 20 * 9.8 = 196 Newtons.

*September 18, 2016*

**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.

*September 18, 2016*

**physics**

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

*September 18, 2016*

**physics**

F = 1.8C + 32.

*September 18, 2016*

**Physics**

See previous post.

*September 17, 2016*

**Physics**

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

*September 17, 2016*

**Physics**

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

*September 17, 2016*

**physics**

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

*September 17, 2016*

**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.

*September 17, 2016*

**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.

*September 17, 2016*

**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 =

*September 16, 2016*

**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.

*September 15, 2016*

**physics**

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

*September 15, 2016*

**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.

*September 15, 2016*

**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].

*September 14, 2016*

**Algebra II**

d = 44g.

*September 14, 2016*

**algerbra help plzzz**

I found NONE.

*September 14, 2016*

**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).

*September 13, 2016*

**pre algebra 8th grade(0, 0.3), (1, 0.5), (2, 0.7),**

Please ignore the 3 points preceding my name.

*September 13, 2016*

**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.

*September 13, 2016*

**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.

*September 13, 2016*

**science**

F = M*a.

*September 13, 2016*

**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.

*September 13, 2016*

**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.].

*September 12, 2016*

**science**

What is the previous question?

*September 10, 2016*

**Physical science**

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

*September 10, 2016*

**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.

*September 9, 2016*

**ENGLISH**

RIDDLE:My weakness and fame equals

*September 9, 2016*

**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...

*September 8, 2016*

**Physics**

d = 8.5m/s * 240s =

*September 8, 2016*

**physics**

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

*September 8, 2016*

**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...

*September 8, 2016*

**Physics**

d = 25m/s * 50s =

*September 8, 2016*

**Physics**

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

*September 8, 2016*

**Physics**

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

*September 8, 2016*

**physics**

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

*September 8, 2016*

**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.].

*September 8, 2016*

**PHYSICS**

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

*September 8, 2016*

**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].

*September 8, 2016*

**profit and loss**

P/150 = 0.20, P = $30.

*September 8, 2016*

**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.

*September 8, 2016*

**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).

*September 8, 2016*

**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 ...

*September 8, 2016*

**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 = ?.

*September 7, 2016*

**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.

*September 7, 2016*

**Physics**

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

*September 7, 2016*

**math**

See your previous post.

*September 7, 2016*

**math**

See previous post.

*September 7, 2016*

**math**

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

*September 7, 2016*

**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.

*September 7, 2016*

**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.

*September 7, 2016*

**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.

*September 6, 2016*

**Physics**

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

*September 6, 2016*

**Physical Science**

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

*September 5, 2016*

**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.

*September 4, 2016*

**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.

*September 4, 2016*

**math**

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

*September 4, 2016*

**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.

*September 4, 2016*

**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.

*September 3, 2016*

**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.

*September 3, 2016*

**profit and loss**

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

*September 2, 2016*

**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 = ?.

*August 31, 2016*

**MATH**

80in * 1cm/48in =

*August 31, 2016*

**math**

r = 0.05/52.

*August 31, 2016*

**algebra**

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

*August 31, 2016*

**math**

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

*August 30, 2016*

**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?

*August 30, 2016*

**Physics**

d = 300 + 400 m. = 700 m.

*August 30, 2016*

**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. = ?.

*August 29, 2016*

**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.

*August 29, 2016*

**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.

*August 28, 2016*

**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.

*August 26, 2016*

**MATH**

150/450 = 1/3.

*August 25, 2016*

**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.

*August 25, 2016*

**Science**

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

*August 24, 2016*

**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...

*August 24, 2016*

**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 = ?.

*August 21, 2016*

**physics**

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

*August 19, 2016*

**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...

*August 17, 2016*

**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].

*August 17, 2016*

**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.

*August 16, 2016*

**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.

*August 16, 2016*

**Biology**

How are cohesion and adhesion of water ar linked to photosynthesis

*August 16, 2016*