Saturday
December 3, 2016

Posts by henry

Total # Posts: 12,432

Physics acceleration
Vf = 91.4mi/h * 1600m/mi * 1h/3600s. = m/s. a = (Vf-Vo)/t = m/s^2. Vo = 0. a = ?
October 1, 2015

physics
Fa+Fb = M*a = 12.3 * 0.443 = 5.45 N. Fa-Fb = 12.3 * 0.280 = 3.44 N. a. Fa + Fb = 5.45. Fa - Fb = 3.44. Sum: 2Fa = 8.89. Fa = 4.45 N. b. Fa + Fb = 5.45 4.45 + Fb = 5.45. Fb = 1.00 N.
October 1, 2015

Physics help!!
a = (Vf-Vo)/t = (-25-49)/0.0022 = -33.64 m/s^2. F = M*a. Note: The force will be negative, because it opposes the initial motion.
October 1, 2015

Physics
See previous post: Fri, 9-11-15, 12:45 PM.
October 1, 2015

physics
See Related Questions: Tue, 4-29-14, 1:34 PM.
October 1, 2015

Physics
h = 0.5g*t^2 = 0.024 m. 4.9*t^2 = 0.024. t = ? Dx = Xo^t = 50 m. Xo*t = 50. Xo = ?. 6
October 1, 2015

Physics
d1 = V1*t = 14m/s * 3.5s. = 49 m. Head-start. a. d2 = 49 + V1*t. 0.5a*t^2 = 49 + V1*t. 0.5*4*t^2 = 49 + 14*t. 2t^2-14t-49 = 0. Use Quadratic Formula. t = 9.56 s. b. d = 0.5a*t^2.
October 1, 2015

Physics
See Related Questions: Thu, 1-31-13, 2:29 AM.
October 1, 2015

physics
X = 172*Cos23. Y = 172*sin23.
October 1, 2015

physics
X = 18 * Cos13.
October 1, 2015

physics
X = 5.2 m. Y = 37.8 m. Disp. = Sqrt(X^2 + Y^2). Tan A = Y/X = 37.8/5.2 = 7.26923. A = 82.2o N. of E. = 7.8o E. of N.
October 1, 2015

physics
Incomplete.
October 1, 2015

physics
Y = 37.8 m. X = 5.2 m. Disp. = Sqrt(X^2 + Y^2) =
October 1, 2015

Pre-Algebra
(1/5)^9 = 1/5^9 = 5^-9.
October 1, 2015

conversion
2kw = 2000 W. hp = 2000/746.
October 1, 2015

conversion
20 Watts = 20 J/s.
October 1, 2015

PHYSICS
M1*V1 + M2*V2 = M1*V + M2*V. 5000*15 + 1000*(-30) = 5000V + 1000V. V = ?.
October 1, 2015

PHYSICS
Density = 100g/600cm^3 = g/cm^3.
October 1, 2015

PHYSICS
F = 155N/m * 0.05m = 7.75 N.
October 1, 2015

physics
a = (Vf-Vo)/t = (-4.1-2.1)/0.36 = -17.2 m/s^2. a. F = M*a = 0.19 * (-17.2) = -3.27 N. b. Direction = West. c. a=(-4.1i-2.1)/0.36=(4.61[243o]/0.36 = 12.8 m/s^2[243o]. F = M*a = 0.19 * 12.8[243o] = 2.43N.[243o] d. Direction = 243o CCW.
October 1, 2015

physics
a = (Vf-Vo)/t = (36-5.5)/0.0316 = 965.2 m/s^2. d = Vo*t + 0.5a*t^2 = 5.5*0.0316 + 0.5*965.2*0.0316^2 = 0.656 m.
September 30, 2015

math
3(x-2) + 4 > 2(2x-3). 3x-6 + 4 > 4x-6. 3x-4x > -6 + 2. -x > -4. X < 4. 1. X => 45 min. 2. X =< 2 hrs. 3. $8500 =< X < $12,000.
September 30, 2015

math
d = 6mi * 5,280Ft/mi * 1yd/3Ft + 551yds = 11,111 yds. d = 11,111yds. * 3Ft./yd. * 1m/3.3Ft. = 10,100.9 m.
September 30, 2015

Physics
See previous post: Mon, 9-28-15, 9:46 PM
September 29, 2015

Physics
225o = 180 + 45o. So the vector is 45o below West. Therefore, it will point to the left and downward at an angle of 45o. The three vectors can also be drawn from the origin.
September 29, 2015

PHYS 101
Wb = M*g = 1.70 * 9.8 = 16.7 N. Fp = 16.7*sin27.4 = 7.67 N. = Force parallel to the incline. a. a = Fp/M = 7.67/1.70 = 4.51 m/s^2. b. PE = Mg*h = 16.7*0.485 = 8.08 J. KE = 0.5M*V^2 = 8.08. 0.85*V^2 = 8.08. V^2 = 9.51. V = 3.08 m/s. c.
September 29, 2015

math help
Y = 3x^2-6x-9 = 0. A*C = 3 * -9 = -27. sum = 3 + (-9) = -6 = B. 3x^2 + (3x-9x) - 9 = 0. Form two factorable binomials: (3x^2+3x) - (9x+9) = 0. 3x(x+1) - 9(x+1) = 0. (x+1)(3x-9) = 0. x+1 = 0, X = -1. 3x-9 = 0, 3x = 9, X = 3. Intercepts = -1, and 3.
September 29, 2015

welkin
Wb = M*g = 50 * 9.8 = 490 N. = Normal force, Fn. Fk = u*Fn = 0.2 * 490 = 98 N. Work = Fk*d = 98 * 1 = 98 J.
September 29, 2015

Physics
a. d1 + d2 = 30 m. 0.5a1*t^2 + 0.5a2*t^2 = 30. 0.5*0.49*t^2 + 0.5*0.43*t^2 = 30. t = ?. b. d1 = 0.5a1*t^2.
September 29, 2015

Physics
a = (Vf-Vo)/t = (6.20-0)/3.56. d = 0.5a*t^2.
September 29, 2015

physics
Vc + Vb = 6 + 10i = 11.7km/h[59o] CCW. = 31o E. of N. Boat should sail 31o W. of N.
September 29, 2015

Physics Projectile Motion
See previous post: Mon, 9-28-15, 10:47 PM.
September 29, 2015

Advanced functions
No. Going twice as far does not change the braking distance if the initial velocity(Vo) remains constant over that distance.
September 29, 2015

Physics Kinematics.
Xo = 21 m/s. Yo = 16 m/s. a. V = Vo = Sqrt(Xo^2 + Yo^2). b. Y = Yo + g*Tr = 0. 16 - 9.8*Tr = 0. 9.8Tr = 16. Tr = 1.63 s. = Rise time. Tf = Tr = 1.63 s. Tr+Tf = 1.63 + 1.63 = 3.26 s. = Time in air. c. h = 0.5g*Tf^2 = 4.9*1.63^2 = 13 m.
September 28, 2015

Physics 2D Kinematics
Incomplete.
September 28, 2015

Physics
Tb + Ts = 2.5 s. Ts = 2.5-Tb. d = Vs*(2.5-Tb) = 16.5 m. 340*(2.5-Tb) = 16.5. 850-340Tb = 16.5. 340Tb = 833.5. Tb = 2.45 s. = Time of the ball. d = Vb*Tb = 16.5. Vb*2.45 = 16.5. Vb = 6.73 m/s.
September 28, 2015

Physics
Vf = Vo + a*t. Vo = 8.1 m/s. a = 2.8 m/s^2. t = 5.3 s. Vf = ?
September 28, 2015

math
10^5cal./s * 10s. = 10*10^5 cal. = 1 Million calculations.
September 28, 2015

Physics
See previous post: Mon. 9-28-15, 3:51 PM.
September 28, 2015

Physics
X = -4 km. Y = -3.0 km. Q3. Tan A = Y/X = -3/-4 = 0.750 A = 36.9o S of W. = 216.9o CCW. = Direction. Disp. = X/Cos216.9 = -4/Cos216.9=5.0 km.
September 28, 2015

Physics
Disp. = 48.1*sin15.5 =
September 28, 2015

2nd Law Physics
A = (180-107)/2 = 36.5o Above the hor. F = 2.31/2 = 1.16 N., each half. sin36.5 = F/T = 1.16/T. T = 1.16/sin36.5 = 1.94 N., each half.
September 28, 2015

physics
a. distance = 12 + 19 + 12 = 43 km. b. Disp. = 12i + 19 - 12i = 19 km, East.
September 28, 2015

math
5. P = Po(1+r)^n. Sem1-annually: Po = $7,000. r = (5%/2)/100% = 0.025 = Semi-annual % rate expressed as a decimal. n = 2Comp./yr. * 5yrs. = 10 Compounding periods. P = 7000 * (1.025)^10 = $8960.59. Quarterly: r = (5%/4)/100% = 0.0125 = Quarterly % rate expressed as a decimal. ...
September 28, 2015

math
d = (70/55)^2 * 79 = 128 Ft.
September 28, 2015

Math
True or False. 4. -11^2 = -11 * -11 = 121. Simplify. 4.24d^18. 7. Not sure. 8. Not sure.
September 28, 2015

math
a contractor's crew can frame 3 houses in a week. how long will it take them to frame 54 houses if they frame the same number each week?
September 27, 2015

Physics
Vo = 12.5m/s[53.1o]. Xo = 12.5*Cos53.1 = 7.51 m/s. Yo = 12.5*sin53.1 = 10.0 m/s. A. h = ho + -(Yo^2)/2g=75 + 10^2/19.6 = 80.1 m. Above gnd. Y = Yo + g*Tr = 0. Tr = -Yo/g = -10/-9.8 = 1.02 s. = Rise time. 0.5q*Tf^2 = 80.1 m. 4.9Tf^2 = 80.1. Tf^2 = 16.34. Tf = 4.04 s. = Fall ...
September 27, 2015

physics
10 + 5[60o] + F = 0. 10 + 5*Cos60 + i5*sin60 + F = 0. 10 + 2.5 + 4.33i + F = 0. 12.5 + 4.33i + F = 0. F = -12.5-4.33i = 13.2N[W19.1oS]
September 27, 2015

physics
Disp. = 30i + 40 = 50m[36.9o]. dist. = 30 + 40 = 70 m.
September 27, 2015

physics
D = -9 + 17i + 46 = 37 + 17i. X = 37yds, Y = 17 yds. D = Sqrt(X^2 + Y^2)
September 27, 2015

Science
W = F*d = M*g * d.
September 27, 2015

math
An excellent explanation, Allyson!
September 27, 2015

physics
F = 10N.[0o] + 20[60o] = 10 + 20*Cos60 + i20*sin60 = 10 + 10 + 17.3i = 20 + 17.3i = 26.5N.[40.9o].
September 27, 2015

Physics
V = a*t = 15 * 6 = 90 Ft/s.
September 27, 2015

math
Jose's age = X yrs. Valerie's age = Y yrs. Eq1: X + Y = 78. 9 yrs. ago: Jose's age: x-9 yrs. Valerie's age: y-9 yrs. x-9 = 3(y-9). x-9 = 3y-27. Eq2: x - 3y = -18. Subtract Eq2 from Eq1: Difference: 4y = 96. Y = 24 = Valerie's current age. X + 24 = 78. X = ...
September 27, 2015

math
Esmeralda = X yrs. old. Gregory = x+2 yrs. old. In 5 years: Esmeralda = x+5 yrs. old. Gregory = x+2 + 5 = x+7 yrs. old. x+5 + x+7 = 42. 2x + 12 = 42. X = 15 = Esmeraldas' current age.
September 27, 2015

maths
X boys. 3x/7 girls. x + 3x/7 = 30. 7x + 3x = 210. 10x = 210. X = 21.
September 27, 2015

science
h = 0.5g*t1^2 = 500 m. 5t1^2 = 500. t1^2 = 100. t1 = 10 s. = Fall time. h = Vs*t2 = 500. 340*t2 = 500. t2 = 1.47 s. To travel 500 m. t1+t2 = 10 + 1.47 = 11.47 s. To hear the sound of the stone.
September 27, 2015

Phy
Wb = M*g = 3.09 * 9.8 = 30.3 N. Fn = 30.3 - 13.7*sin23 = 24.9 N. = Normal. a. a = 13.7*Cos23/3.09 = 4.08 m/s^2.
September 26, 2015

Physics
F = 10.3i + 19.5 - 15.2i = 19.5 - 4.9i. X = 19.5, Y = -4.9. F = Sqrt(X^2 + Y^2)=Sqrt(19.5^2+4.9^2) = 20.1 N. a = F/M = 20.1/4.06 = 4.95 m/s^2. Note: The direction(angle) is not required.
September 26, 2015

physics
All angles are CCW from the +x-axis. D = 3.6m[90o] + 2.8[45o] + 2.2[211o]. X = 3.6*Cos90 + 2.8*Cos45 + 2.2*cos211 = 0 + 1.98 - 1.89 = 0.09 m. Y = 3.6*sin90 + 2.8*sin45 - 2.2*sin211 = 3.6 + 1.98 - 1.13 = 4.45 m. D = Sqrt(X^2 + Y^2).
September 25, 2015

math
See previous post: Fri, 9-25-15, 11:35 AM.
September 25, 2015

math
20-year fixed: P = Po*r*t/(-(1+r)^-t). Po = 35000*0.95 = $33,250. r = (7.5%/12)/100% = 0.00625 = Monthly %rate expressed as a decimal. t = 20yrs. * 12mo./yr. = 240 Months. P1 = 33,250*0.00625/(1-1.00625^-240) = $64,286.34. I = P1-Po=64,286.34-33,250=$31,036.34. 30-year fixed...
September 25, 2015

physics
V = Vo + g*Tr = 0. Tr = -Vo/g = -7.5/-9.81 = 0.77 s. = Rise time. Tf = Tr = 0.77 s. = Fall time. V = Vo + g*Tf. Vo = 0. g = 9.81. V = ?.
September 25, 2015

physics
V^2 = Vo^2 + 2g*h. Vo = 0. g = 3.7. h = 323 m. V = ?.
September 25, 2015

physics
See previous post: Fri, 9-25-15, 7:13 AM
September 25, 2015

Kabe college
Fr = Sqrt(F^2 + F^2) = Sqrt(2F^2) = 1.414F.
September 25, 2015

physics
V = Vo + g*Tr = 0. Tr = -Vo/g = -150/-10 = 15 s. = Rise time. Tf = Tr = 15 s. Tr+Tf = 15 + 15 = 30s. = Time in flight. V = Vo + g*Tf = 0 + 10*15 = 150 m/s. = Final velocity. h = Vo*Tr + 0.5g*Tr^2. Vo = 150 m/s. Tr = 15 s. g = -10 m/s^2. h = ?.
September 25, 2015

physics
Vo = 80000m/3600s = 22.2 m/s. V = 92000m/3600s = 25.6 m/s. V^2 = Vo^2 + 2a*d. d = (V^2-Vo^2)/2a.
September 25, 2015

Physics
Vo = 27m/s[42o]. Xo = 27*Cos42 = 20.1 m/s. Yo = 27*sin42 = 18.1 m/s. a. Y = 0, V = Xo = 20.1 m/s. b. Y^2 = Yo^2 + 2g*h = 0. h = -Yo^2/2g = -(18.1^2)/-19.6 = 16.7 m, max. Y^2 = Yo^2 + 2g*h/2. = 0 + 19.6*8.35 = 163.66. Y = 12.8 m/s. V = Sqrt(Xo^2 + Y^2). c. (Xo+Y) - Xo = (20.1+...
September 25, 2015

Physics - URGENT
46N.[52o] + 29[0o] + 34.5[270o]+F4 = 0. 46*Cos52 + i46*sin52 + 29 -34.5i +F4=0 28.32 + 36.25i + 29 - 34.5i + F4 = 0. 57.32 + 1.75i + F4 = 0. F4 = -57.32 - 1.75i. X = -57.32 N., Y = -1.75 N. F4 = sqrt(X^2 + Y^2).
September 25, 2015

Physics
Incomplete.
September 25, 2015

Physics
d1 = 88 m. V^2 = Vo^2 + 2a*d1. a = (V^2-Vo^2)/2d1=(7^2-15^2)/176 = -1.0 m/s^2. d2 = (V^2-Vo^2)/2a=(0-15^2)/-1.0 = 225 m d = d2-d1 = 225 - 88 = 137 m.
September 25, 2015

physics
ge = 6*gm.
September 24, 2015

Physics
See previous post: Thu, 9-24-15, 10:35 PM.
September 24, 2015

Physics
Ws = M*g = 49 * 9.8 = 480 N. = Wt. of sofa. Fp = 480*sin30 = 240 N. = Force parallel to ramp. Fn = Normal = 480*Cos30 = 416 N. = Force perpendicular to incline. Fk = u*Fn = 0.320 * 416 = 133 N. = Force of kinetic friction. T-Fp-Fk = M*a. T-240-133 = 49*0.80, T-373 = 39. T = ...
September 24, 2015

physics1
See previous post: Thu, 9-24-15, 7:24 PM
September 24, 2015

physics
See previous post: Thu, 9-24-15, 7:24 PM
September 24, 2015

Physic
See previous post: Thu, 9-24-15, 7:24 PM
September 24, 2015

Physic
R = 9[30.4o] + 12[102.3o] + 18[180o] + 16[293.8o]. X = 9*Cos30.4+12*Cos102.3+18*Cos180+ 16*Cos293.8 = Y = 9*sin30.4+12*sin102.3+18*sin180+ 16*sin293.8 = R = sqrt(X^2 + Y^2).
September 24, 2015

Physics
2. a, and b. 3. b.
September 24, 2015

Physics
1. Area = pi*r^2. 2. You cannot add time and distance, but you can divide: V = d/T or distance per unit of time.
September 24, 2015

Physics
V^2 = Vo^2 + 2g*h. Vo = 0. g = 9.8 m/s^2. h = 12 m. V = ?.
September 24, 2015

math fraction
1/5 * 1/2 = 1/10. 3/4 * 1/2 = 3/8. Bal.=1/2 - (1/10+3/8)=1/2-(4/40+15/40) = 1/2 - 19/40 = 20/40 - 19/40 = 1/40.
September 23, 2015

physics
d = Vo*t = 21m/s * 0.245s = V^2 = Vo^2 + 2a*d. V = 0. Vo = 21 m/s. a = -5.29 m/s. d = ?.
September 23, 2015

physics
D = 2000[145o] + 500[270o]. X = 2000*Cos145 + 500*Cos270 = -1638+0 = -1638 km. Y = 2000*sin145 + 500*sin270 = 1147-500 = 647 km. Q2. Tan A = Y/X = 647/-1638 = -0.39499. A = -21.6o N. of W. = 158.4o CCW. = Direction. D = X/Cos A = -1638/Cos158.4 = 1762 km.
September 21, 2015

physics
0.5g*t^2 = 30.2-17.4 = 12.8 m. Above gnd 4.9*t^2 = 12.8. t^2 = 2.61 s.
September 21, 2015

physics
V = Vo + g*t = 0 @ max ht. t = -Vo/g = -9/-9.8 = 0.92 s.
September 21, 2015

Physics
F = 6.90[54o] + 5[90o] X = 6.9*Cos54 + 5*Cos90 = 4.1 Units. Y = 6.9*sin54 + 5*sin90 = 10.6 Units. Q1. F = sqrt(X^2 + Y^2) = 11.4 Units. Tan A = Y/X = 10.6/4.1 = 2.58537. A = 68.9o CCW = Direction. OR: Y = F*sin A = 10.6. sin A = 10.6/F = 10.6/11.4 = 0.92982. A = 68.4o CCW.
September 20, 2015

physics
X = 225*Cos12 = 220.1 N. Y = 225*sin12 = 46.8 N.
September 20, 2015

Physics
Wb = M*g = 17.8 * 9.8 = 174.4 N. Fn = Mg-Fap*sin31.3 = 174.4-72.8*sin31.3 = 136.6 N. = Normal force. Fk = u*Fn = 0.239*136.6 = 32.7 N. Work = (Fap*Cos31.3-Fk) * d = (72.8-32.7) * 64.4 =
September 20, 2015

Physics
M*g = 800 N. = Normal(Fn). Fap-Fk = M*a. 60-u*800 = M*0 = 0. u*800 = 60. u = 0.075.
September 20, 2015

Physics
V = Vo + a*t. V = 13.5 m/s. Vo = 17.3 m/s. a = -2.8 m/s^2. t = ?.
September 20, 2015

Physics-HELP
Dx = Xo*t = 7.5 m. 8.8 * t = 7.5. t = 0.852 s. h = 0.5g*t^2. g = 9.8 m/s^2. t = 0.852 s. h = ?.
September 20, 2015

math foe managers
1st number = X. 2nd number = Y. Eq1: 5x + 3y = 47. Eq2: 10x - 4y = 54. Solve the Eqs using the Elimination Method: Multiply Eq1 by -2 and add the Eqs.
September 20, 2015

physics
Dc = Dt + 150 0.5a2*t^2 = 0.5a1*t^2. + 150. a1 = 1.5 m/s^2. a2 = 2 m/s^2. t = ?. Dc = 0.5a2*t^2 =
September 20, 2015

Physics
a. h = 0.5g*t^2. b. Dx = Xo*t = 10m/s * 5s. = 50 m.
September 20, 2015

Finance
Incomplete.
September 20, 2015

Physics
V = Vo + a*t. V = 10 m/s. Vo = 98 m/s. a = (V^2-Vo^2)/2d. It will be negative. t = ?.
September 20, 2015

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