Wednesday
May 4, 2016

Posts by Henry

Total # Posts: 11,797

Physics
See Related Questions: Wed, 9-2 09, 11:44 PM.
September 8, 2015

science
a. h = ho - (Vo*t + 0.5g*t^2) h = 40 - (-5*0.25 + 4.9*0.25^3) = 40.9 m V = Vo + g*t = -5 + 9.8*0.25=-2.55 m/s. b. h = 40 - (-5*1 + 4.9*1^2) = 40.1 m. V = -5 + 9.8*1 = 4.8 m/s.
September 8, 2015

physics
Vb = 4mi/h * 1609m/mi * 1h/3600s = 1.79 m/s. Vw = a*t = 0.30 * 2.7 = 0.81 m/s. Vr. = sqrt(Vb^2+Vw^2) = 1.96 m/s. = Resultant velocity. D = Vr*t = 1.96*2.7 = 5.29 m. Tan A = Y/X = Vw/Vb = 0.81/1.79=0.45251 A = 24.3o = Direction.
September 8, 2015

math
17 + 15/3 - 2^4 = 17 + 5 - 16 = 6.
September 7, 2015

algebra
100% - 60% = 40% Did not shop for clothes. 0.40P = 2500. P = 6,250 People at the mall. 6250-2500 = 3,750 People shopped for clothes. Yes!!
September 7, 2015

physics 201
d = 0.5a*t^2 = 10 m. 0.5a*3.9^2 = 10. 0.5a = 0.657. a = 1.31 m/s^2. L = 0.5*a*t^2. a = 1.31 m/s^2. t = 3.9 + 1 = 4.9 s. L = ?
September 7, 2015

physics
Range = Vo^2*sin(2A)/g = 4 m. Vo^2*sin(90)/9.8 = 4. 0.102Vo^2 = 4. Vo^2 = 39.2. Vo = 6.3 m/s. * 1mi/1600m * 3600s/h = 14.1 mi/h.
September 6, 2015

Physics
Incomplete.
September 6, 2015

physcial science
V = Vo + g*t. Vo = 0. g = 9.8 m/s^2. t = 3.4 s. V = ?
September 6, 2015

science
Incomplete.
September 6, 2015

Physics
X = 55.9 m/s. Y = 26.6 m/s. a. Speed = sqrt(X^2+Y^2). b. Tan A = Y/X = 26.6/55.9 = 0.47585. A = 25.4o S. of E. = 64.6o With vertical
September 6, 2015

Physics
D = 736.4[130o] + 134[199o] + 157[195o]. X=736.4*Cos130 + 134*Cos199 + 157*Cos195 = -473.3 - 126.7 - 151.7 = -751.7 Paces. Y=736.4*sin130 + 134*sin199 + 157*sin195 =564.1 - 43.63 - 40.63=479.8 Paces. Q2. a. Magnitude=sqrt(X^2+Y^2) = 892 Paces. b. Tan A = Y/X = 479.8/-751.7=-0....
September 6, 2015

physics
Vo = 95000m/3600s = 26.4 m/s. V = 85000m/3600s = 23.6 m/s. Vo*t + 0.5a*t^2 = V*t + 55. 26.4*18 + 0.5a*18^2 = 23.6*18 + 55 a = ?
September 5, 2015

Physics
Vp = 85,000m/3600s = 23.61 m/s. Vs = 130,000/3600 = 36.11 m/s. Ds = 36.11m/s * 3s = 108.3 m. Head start Vo*t + 0.5a*t^2 = Vs*t + 108.3 23.61t + 0.5*2.30*t^2 = 36.11t + 108.3. -12.5t + 1.15t^2 = 108.3. 1.15t^2 - 12.5t - 108.3 = 0. Use Quadratic Formula. t = 16.6 s.
September 5, 2015

Physics
20t + 20t = 18 m. t = 18/40 = 0.45h = 1620 s.
September 5, 2015

PHYSICS
h = 0.5g*t^2 h = 6 Ft. g = 32Ft/s^2. t = ?.
September 5, 2015

physics
Note: Since the current is 10 times the previous current, the resistance is 1/10 of the previous resistance: 990/10.
September 5, 2015

physics
990*R/(990+R) = 990/10. 990*R/(990+R) = 99. 990*R = (990+R)99. 10R = 990+R. 9R = 990. R = 110 Ohms.
September 5, 2015

Physics
See previous post: Sat, 9-5-15, 12:29 AM
September 5, 2015

Physics
D=65m[90o] + 200[0o] + 110[30o] + 150[270]. X = 200 + 110*Cos30 = 295.3 m. Y = 65 + 110*sin30 - 150 = -30 m., Q4. Tan A = Y/X = -30/295.3 = -0.10159. A = -5.80o = 5.8o S. of E. = Direction. D = X/Cos A = 295.3/Cos5.8 = 297 m.
September 5, 2015

physics
3600s/h * 24h/d * 365d/y = 31,536000 s/yr Accuracy = (8/31,536,000) * 100% = 2.54*10^-5.
September 4, 2015

Physics
a. V^2=Vo^2 + 2a*h=(46.4)^2 - 4.36*138 = 1551.28. V = 39.4 m/s. at shut-off. h max = 138m + -(Vo^2)/2g = 138 + (39.4^2)/19.6 = 217 m. Above gnd. b. V = Vo + a*T1 = 39.4 m/s. 46.4 - 2.18T1 = 39.4. -2.18T1 = - 7. T1 = 3.21 s. h = Vo*T2 + 0.5g*T2^2 = 217-138. 39.4T2 - 4.9T2^2 = ...
September 4, 2015

Physics
a. Range = Vo^2*sin(2A)/g = 400 Ft. Vo^2*sin(60)/32 = 400. 0.02706Vo^2 = 400. Vo^2 = 14,782. Vo = 122 Ft./s. b. Yo = Vo*sin A = 122*sin30 = 61 Ft/s. = Ver. component of initial velocity. Y^2 = Yo^2 + 2g*h = 0. h = -(Yo^2)/2g = -(61^2)/-64 = 58.1 Ft. c. Xo = Vo*Cos A=122*Cos30...
September 4, 2015

Physics
See Related Questions: Mon, 9-29-14, 12:56 AM.
September 4, 2015

Phsyics
See previous post: Thu, 9-3-15, 7:22 PM.
September 4, 2015

science (physics)
Fap-Fs = 50-2 = 48 N. = Net force.
September 4, 2015

Physics
V^2 = Vo^2 + 2g*h = 0. h = -Vo^2/2g = -(14.5^2)/-19.6 = 10.73 m. Above the roof. V = Vo + g*Tr = 0. Tr = -Vo/g = -14.5/-9.8 = 1.48 s. = Rise time. 0.5g*Tf^2 = 62+10.73. 4.9*Tf^2 = 72.73. Tf^2 = 14.8. Tf = 3.85 s. = Fall time. Tr+Tf = 1.48 + 3.85 = 5.33 s. = Time in flight.
September 4, 2015

math
X = 500km. Y = 200km. Tan A = Y/X = 200/500 = 0.400. A = 21.8o N. of W.= 68.2o W. of N. = The Bearing. D = 500/Cos21.8 = 539 km.
September 4, 2015

calculus
Vo = 20mi/h * 5280Ft/mi * 1h/3600s. = 29.3 Ft/s. = Initial velocity. V = (50/20) * 29.3 = 73.3 Ft/s. V^2 = Vo^2 + 2a*d. Solve for a, Ft/s^2.
September 4, 2015

Physics
See previous post: Thu, 9-3-15, 9:53 PM.
September 3, 2015

Physics
V = Vo + a*t. V = 15.9 m/s. a = 3.21 m/s^2. t = 2.41 s. Solve for Vo.
September 3, 2015

physics
The heading of wind from southwest is northeast which is 45o N. of E. Vaw = Va + Vw = -734i. Va + 110[45o] = -734i. Va + 110*Cos45 + i110*sin45 = -734i. Va + 77.8 + 77.8i = -734i. Va = -77.8 - 811.8i, Q3. Tan A = -811.8/-77.8. = 10.43445. A = 84.5o S. of W. = 5.5o W. of S. = ...
September 3, 2015

Physics
10.5 km = 10,500 m. V1*t + V2*t = 10,500. 9.5t + 10.4t = 10,500. 19.9t = 10,500. t = 528 s.
September 3, 2015

physics
Dc = 100km + Dt. Vc*t = 100 + Vt*t. 120*t = 100 + 80*t. 40t = 100. t = 2.5 h. To catchup. Dc = V*t = 120 * 2.5 = 300 km To catchup.
September 3, 2015

physics
KE = 0.5*M*V^2 = 12,000 J. 0.5*60*V^2 = 12000. V = 20 m/s. Speed = 0.020km/s * 3600s/h = 72 km/h.
September 3, 2015

physics
540/600 * 110 = 99 Hz. Fb = 110 - 99 = 11 Hz. = Beat Freq.
September 3, 2015

physics
B = 10*Log(1) = 10 * 0 = 0.
September 3, 2015

physics
5 = 10*Log(y/100) Log(y/100) = 0.5 y/100 = 10^0.5 = 3.16. Multiply both sides by 100: Y = 316.
September 2, 2015

Physics
d1 = 0.5a*t^2 = 0.5*2.4*3^2 = 10.8 m. Head start for Jill. 0.5*4*t^2 = 0.5*2.4*t^2 + 10.8. 2t^2 = 1.2t^2 + 10.8. 0.8t^2 = 10.8 t^2 = 13.5. t = 3.7 s. to catchup.
September 2, 2015

Physics
A. 9.8/1.67 * 270 = 1584 N. B. M*g = 270 N. M*1.67 = 270. M = 161.7 kg. C. Same as on the moon: 161.7 kg.
September 2, 2015

Algebra
Equation: 5x + 10y = 245 Cents. Note: They only asked for an Equation. We don't have enough information to solve the problem.
September 2, 2015

Physics
A. V = d/t = 50m/10s. = 5 m/s. B. = V = 50m/10s = 5 m/s. C. V = 100m/20s = 5 m/s.
September 2, 2015

Physics
A. h = 10*sin25o. B. d = 10*Cos25.
August 31, 2015

Precalc
10. Any point on the x-axis has a Y of 0; 12 units to the left of the Y-axis is an X value (-)12: P(-12,0). 12. Q3, or Q4 depending on whether X is positive or negative. 16. X,Y < 0. Q3. 26. (-3,-1), (2,-1). D^2 = X^2 + Y^2 = (2+3)^2 + (-1+1)^2 = 25 + 0 = 25. D = 5. 30. (1,...
August 31, 2015

pre algebra
Zero is an integer which is a whole number.
August 31, 2015

physic
M1*V1 + M2*V2 = M1*V3 + M2*V4. 1.2*7.5 + 12*0 = 1.2*(-3.8) + 12*V4. 9 + 0 = -4.56 + 12V4. 12V4 = 13.56. V4 = 1.13 m/s. = Velocity of the wagon.
August 31, 2015

Physics
V^2 = Vo^2 + 2g*h. V = 30 m/s. g = +9.8 m/s^2. Vo = 0. Solve for h.
August 31, 2015

Physics
V^2 = Vo^2 + 2g*h. Vo = 0. g = 9.8 m/s^2. h = 1.4 m. Solve for V. Momentum = M*V.
August 31, 2015

physics
a = (V-Vo)/t. V = 2o m/s. Vo = 0. t = 5 s. F = M*a.
August 31, 2015

Physics
V = Vo + g*t = 0 + 9.8*6 = 58.8 m/s after the first 6 s. d = Vo*t + 0.5g*t^2 = 58.8*6 + 4.9*6^2 = 529.2 m. in the last 6 s.
August 31, 2015

Physics
See previous post: Sat, 8-29-15, 3:51 AM.
August 31, 2015

Physics
a. h = Vo*t + 0.5g*t^2 = 0.644 m. Vo*0.17 - 4.9*0.17^2 = 0.644. 0.17Vo = 0.644 + 0.142 = 0.786. Vo = 4.62 m/s. b. V=Vo + g*t=4.62 - 9.8*0.17 = 2.95 m/s. c. Vo^2 = Vo^2 + 2g*h = 0. h = -Vo^2/2g = -(4.62^2)/-19.6 = 1.09 m. 1.09-0.644 = 0.446 m higher.
August 30, 2015

Trigonometry/ please help!
Assume that simple harmonic motion of a spring is described by the equation S=4 cos πt/ 2 where s is in centimetres and t is in seconds. When during the time 0<=t<=8 is the spring passing through the origin? I attempted this question but the graph doesn't pass ...
August 29, 2015

Physics
a. V = a*t = 8.9 m/s. 20*t = 8.9. t = 0.445 s. b. d = 0.5a*t^2. c. d = 0.5a*t^2. d = 4.3 m. a = 20 m/s^2. Solve for t.
August 29, 2015

Physics
13.9h - 0.81h = 13.09 h. = Travel time. EB trip = T Hours. WB trip = (T+51/60) Hours. T + (T+0.85) = 13.09 h T + T+0.85 = 13.09. 2T = 12.24. T = 6.12 h. = EB trip. T+0.85 = 6.97 h. = WB trip. a. Vavg=Dt/Tt=(2*4100)/13.9 = 590 km/h. b. Vavg = (2*4100)/13.09 =
August 29, 2015

Physics
F = M*a. M = 0.4 kg.
August 29, 2015

Physics
a = (V-Vo)/t = m/s^2. V = 14 m/s. Vo = 0. t = 0.08 s. Solve for a. F = M*a.
August 29, 2015

Physics
a = (V-Vo)/t = m/s^2. V = 20 m/s. t = 5 s. Vo = 0. Solve for a. F = M*a.
August 29, 2015

Math
(x^2-y^2)/(x-y)^2 = (x+y)(x-y)/(x-y)(x-y)= (x+y)/(x-y). Recall: a^2-b^2 = (a+b)(a-b).
August 28, 2015

Physics
1.02V = 3.50 Volts. V = 3.431 Volts.
August 27, 2015

Physics
a = u*g = 0.0343 * (-9.8) = -0.336 m/s^2. V^2 = Vo^2 + 2a*d = 0. Vo^2 = -2a*d = -2*(-0.336)*12.1 = 8.13. Vo = 2.85 m/s.
August 27, 2015

physics
V = a*t = 7.5 m/s. 1.5*t = 7.5. t = 5 s. d = 0.5a*t^2 = 0.5*1.5*5^2 = 18.75 m.
August 27, 2015

Physics
a. Work = = M*g*h = 58 * 9.8 *3.7 = 2103 J. b. Work = M*g*h.
August 27, 2015

physics
a. = h = 0.5g*t^2 = 35 m. 4.9t^2 = 35. t^2 = 7.14 t = 2.67 s. Time in flight. b. Range = Xo*t = 80 m. Xo*2.67 = 80. Xo = 30.0 m/s. c. Y^2 = Yo^2 + 2g*h = 0 + 19.6*35 = 686. Y = 26.2 m/s. X = Xo = 30.0 m/s.
August 27, 2015

physics
V^2 = Vo^2 + 2a*d. V = 5.8 m/s. Vo = 9.0 m/s. d = 5.3 m. Solve for a. It will be negative.
August 26, 2015

math
1. (10+n) + 5 = 15 + n. 2. 8*7 - n 3. n/3 + 1. 4. 6*8 - 10 - n = 38 - n. 5. (n-1) - 2 = n - 3. 6. n*(-n) + 7 = -n^2 + 7.
August 26, 2015

math
The phase angle is expressed in terms of the apparent power and cosine function: Pa = V*I = Apparent power. P = V*I*Cos A = Real power = Power dissipated in the resistance. Cos A = P/VI.
August 26, 2015

Physics
9,158,960km^2 = 9,158,960*10^6 m^2 = 9.159*10^12 m^2. m^2 * (kJ/m^2)/h = Total kJ/h.
August 26, 2015

sound
B.
August 26, 2015

maths
1. Do the multiplication. 2. Combine like-terms. 4. Factor if possible.
August 26, 2015

maths
2(x+2)^2 - (2x-1)(x+2). 2(x^2+4x+4) - (2x^2+4x-x-2). 2x^2 + 8x + 8 - 2x^2 - 3x + 2. 5x + 10 = 5(x+2).
August 26, 2015

maths
2ax - 4bx - ay - 2by. 2x(a-2b) - y(a-2b). (a-2b)(2x-y).
August 26, 2015

maths
x^2 - 4x - 5. -5 = 1*(-5). -5+1 = -4 = B. x+1 = 0. X = -1. x + (-5) = 0. or x-5 = 0. X = 5. x^2 - 4x - 5 = (x+1)(x-5).
August 26, 2015

maths
Factor out (a-3).
August 26, 2015

maths
ax^2 - 2ax - apx. ax(x - 2 - p).
August 26, 2015

Math
A.
August 25, 2015

Math
See previous post: Tue, 8-25-15, 2:55 PM.
August 25, 2015

Algebra
8/(15x+24y) * (5x+8y)/10 = 8/3(5x+8y) * (5x+8y)/10 = 8/3 * 1/10 = 8/30 = 4/15.
August 25, 2015

math
My answers: 1. No 2. No 3. Yes. 2/5 * 8/9 = The amount drunk. 4. Yes. 2/5 * 8/9 = 16/45 = The amount drunk.
August 25, 2015

Math
4X^0.5/(6-X^0.5) = 4X^0.5(6+X^0.5)/(6-X^0.5)(6+X^0.5) = (24x^0.5 + 4x)/(36-X) = (24sqrt(X)+4x)/(36-X). Recall: (a+b)(a-b) = a^2-b^2. sqrt X = X^0.5.
August 25, 2015

Physics
V1 = a*t = 1.5 * 5 = 7.5 m/s. V2 = V1 + a*t = 7.5 - 2*3 = 1.5 m/s.
August 25, 2015

Science
B.
August 25, 2015

Physics
V1 = 15mi/h * 5280Ft/mi * 1h/3600s = 22Ft/s. V2 = 50/15 * 22 = 73.3 Ft/s. a. a = (V2-V1)/t=(73.3-22)/13 = 3.95 Ft/s. b. d = V1*t + 0.5*a*t^2. t = 13 s. Solve for d.
August 25, 2015

Physics
Vo = 200 cm/s = 2 m/s. V = 10,000 cm/s = 100 m/s. V^2 = Vo^2 + 2g*d = !00^2. 2^2 + 19.6*d = 100^2. Solve for d.
August 25, 2015

physics
The initial velocity is negative,because the stone was moving upward before it began to free fall. In other words, the balloon containing the stone was moving upward as the stone began to move downward. If the stone had been THROWN downward from a stationary object, the ...
August 25, 2015

physics
See previous post: Sat, 8-22-15, 11:06 AM
August 25, 2015

Physics
A. V^2 = Vo^2 + 2g*h = 9.5^2 - 19.6*3.6 = 19.69. V = 4.44 m/s. B. V = Vo + g*t = 4.44. 9.5 - 9.8t = 4.44. -9.8t = -5.06. t = 0.533 s.
August 24, 2015

Physics
M*g = 1.5 * 9.8 = 14.7 N.=Wt. of blk A. a. PE = M*g*h = 14.7*0.5 = 7.35 J. b. V^2 = Vo^2 + 2g*h = 0 + 19.6*0.5 = 9.8. 3.13 m/s. KE = 0.5M*V^2 = 0.5*1.5*3.13^2 = 7.35 J. c. M1*V1 + M2*V2 = M1*V + M2*V. 1.5*3.13 + 1.5*0 = 1.5V + 1.5V. 4.7 + 0 = 3V. V = 1.57 m/s. d. KEa = KEb = ...
August 24, 2015

Physics
Vo = 20mi/h * 5280Ft/mi * 1h/3600s. = 29.3 m/s. V = 30/20 * 29.3 = 44 m/s. a = (V-Vo)/t = (30-20)/t = 10/t. d = 0.5*a*t^2 = 500 Ft. 0.5*(10/t)*t^2 = 500. 5t = 500. t = 100 s. a = 10/t = 10/100 = 0.10 Ft/s^2
August 24, 2015

Physics
d1 = d2. V1*t1 = 0.5a*t^2. V1*12 = 0.5*4.4*12^2. Solve for V1(m/s).
August 23, 2015

physics
See Related Questions: Thu, 9-15-11, 4:06 PM.
August 23, 2015

physics
d1 = V1*t1 t1 = d1/V1 = 20/30 = 0.667 h. V2=40Ft/s * 1m1/5280Ft * 3600s/h = 27.3 mi/h. t2 = d2/V2 = 20/27.3 = 0.733 h. V3 = 90km/h * 1m1/1.6km = 56.3 mi/h. t3 = d3/V3 = 20/56.3 = 0.355 h. d = d1+d2+d3 = 20 + 20 + 20 = 60 mi. T = t1+t2+t3 = 0.667 + 0.733 + 0.355 = 1.76 h. V = d...
August 23, 2015

Physics
See previous post: Sat, 8-22-15, 10:49 AM
August 23, 2015

calc
V = t^2 - 2t = 3^2 - 2*3 = 3 Ft/min. d = V*t = 3Ft./min. * 3min. = 9 Ft.
August 22, 2015

Physics
h = Vo*t + 0.5g*t^2 = -8*6 + 4.9*6^2 = 128.4 m.
August 22, 2015

Physics
M*g = 1500 * 9.8 = 14,700 N. = Wt. of block. = Normal(Fn). Fap-Fs = M*a. 200-Fs = M*0 = 0. Fs = 200 N. Fs = u*Fn. u = Fs/Fn = 200/14,700 = 0.0136.
August 22, 2015

physics
W1*d1 = W2*d2. 10 * 2.5 = 15*d2. d2 = 25/15 = 1.67 m. from the center. d2 = 2.5-1.67 = 0.83 m. from the end.
August 22, 2015

Maths proportions
1. 9/4.5 = 5/L. Solve for L. 2. 36/20.52 = 120/C. 3. Same procedure as #1and #2. 4. 20 Grams = 0.02 kg. C = 0.020kg * 60/kg = 5. ht. = 623Ft. * 1m/3.281Ft
August 22, 2015

Physics.
d = V*t.
August 21, 2015

math
B is my answer also.
August 21, 2015

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