Thursday
September 3, 2015

Posts by henry


Total # Posts: 10,942

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

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

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

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

Algebra
2x(x-5)^-3(1-2x(x-5)^-1) = 2x/(x-5)^3 * (1-2x/(x-5)) = 2x/(x-5)^3 * ((x-5)/(x-5)-2x/(x-5) = 2x/(x-5)^3 * (-x-5)/(x-5) = 2x(-x-5))/(x-5)^4).
August 21, 2015

Trigonometry and Analysis
To avoid the decimals: $1.00 = 100 Cents. $0.84 = 84 Cents. 0.01 = 1 Cent.
August 21, 2015

Trigonometry and Analysis
X Dimes. 2x Pennies. 10*x + 1*2x = 84 Cents. 12x = 84. X = 7 Dimes. 2x = 2*7 = 14 Pennies.
August 21, 2015

Physics
Vsw = Vs + Vw = 3 + 2i, Q1. Tan A = 2/3 = 0.66667. A = 33.7o E. of N. Body angle = 33.7o W. of N.
August 21, 2015

ALGEBRA
1b. 3. Divide each price by the wt of the cereal and choose the lowest price: 4.29/28oz = $0.15/oz.
August 21, 2015

Physics
Range = Vo^2*sin(2A)/g=200^2*sin(60)/9.8 = 3535 m.
August 21, 2015

physics
V = Vo + a*t = 6 + 1.5*4 = 12 m/s. d1 = Vo*t + 0.5*a*t^2=6*4 + 0.5*1.5*4^2 = 24 + 12 = 36 m. d2 = (V^2-Vo^2)/2a = (0-144)/-2.4=60 m. d = d1+d2 = 36 + 60 96 m.
August 21, 2015

Physics
See previous post: Thu, 8-20-15, 4:47 PM.
August 20, 2015

Physics
V=34mi/h * 1609m/mi * 1h/3600s.=15.2 m/s. d = V*t = 80 m. 15.2t = 80. t = 5.3 s.
August 20, 2015

Physics-PLEASE HELP
d1 = V1*t1 = 1 km. t1 = 1/V1 = 1/5 = 0.20 h. t2 = 1/V2 = 1/7 = 0.143 s. V=d/(t1+t2)=2km/(0.20+0.143)h=5.8 km/h.
August 20, 2015

Pre-Calculus
1. D(0.5,1), V(h,1), F(1.5,1). F - D = 1/2a. 1.5-0.5 = 1/2a. 1/2a = 1. 2a = 1. a = 0.5. h-0.5 = 1/4a = 1/2 = 0.5. h = 1.0. X = a(y-k)^2 + h. X = 0.5(y-1)^2 + 1. Vertex form. X = 0.5(y^2-2y+1). X = 0.5y^2 -y + 1.5. Standard form.
August 19, 2015

math
Y = x^4 - x^3 - 12x^2 = 0. Roots are: -3, 0, and 4.
August 19, 2015

math
Y = x^3 - 13x - 12 = 0. X = -1, x+1 = 0. (x^3 - 13x - 12)/(x+1) = x*2 - x - 12. x^3-13x-12 = (x+1)(x^2-x-12). Factor the Quadratic: (x+1)(x+3)(x-4) = 0. x+3 = 0, X = -3. x-4 = 0, X = 4. The roots are: X = -1, -3, and 4.
August 19, 2015

math
Y = x^3 -2x^2 - 7x - 4 = 0. By trial and error, I found that (-1) satisfies the Eq, and it is our 1st root. x = -1, x + 1 = 0. Using synthetic(Long-hand) division, divide the cubic Eq by x+1: (X^3 - 2x^2 - 7x - 4)/(x+1)=x^2 - 3x - 4 x^3 - 2x^2 -7x - 4 = (x+1)(x^2-3x-4). Factor...
August 19, 2015

physics
post it.
August 19, 2015

physics
D = 10.3[90o] + 6.1[45] + 5[180]. X = 10.3*Cos90 + 6.1*Cos45 + 5*Cos180 = 0 + 4.31 - 5 = -0.69 Blocks. Y = 10.3*sin90 + 6.1*sin45 + 5*sin180 = 10.3 + 4.31 + 0 = 14.61 Blocks. D = sqrt(X^2+Y^2) = sqrt((-0.69)^2 + 14.61^2) = 14.6 Blocks. Tan A = Y/X = 14.61/-0.69 = -87.3o = 87....
August 18, 2015

usiness math
P = Po + Po*r*t = 30,000 + 30,000*(0.04/360)*45 - 10,000 = 30,000 + 150 -10,000 = $20,150.
August 18, 2015

physics
Xo = 15 m/s = Hor. component of initial velocity. Tr = 1.2 + 1.2 = 2.4 s. = Rise time. Y = Yo + g*Tr = 0. Yo = -g*Tr = -(-9.8)*2.4 = 23.5 m/s. = Ver. component 0f initial velocity. Y = Yo + g*t = 23.5-9.8*1.2 = 11.74 m/s. a. V = sqrt(Xo^2+Y^2)=sqrt(15^2+11.74^2) = 19 m/s. b. Y...
August 18, 2015

Physics PLEASE HELP!
KE = 0.5M*V^2. M = 1.*10^-3 kg. V = 1.*10^3 m/s. Solve for KE.
August 17, 2015

physics
d = V*t = 8.69*10^-2. 4.61*10^-6m/s * t = 8.69*10^-2. t = 8.69*10^-2/4.61*10^-6 = 1.89*10^4 = 18900 s. = 5.25 h.
August 17, 2015

physics
Xo = 25 m/s. Remains constant. Yo = 45 m/s. Decreases to zero at max ht. Therefore, V = 25 m/s at max ht.
August 17, 2015

physical science
V = a*t = 3.125 * 4 = 12.5 m/s.
August 17, 2015

physics
Vo = 20m/s.[50o]. Xo = 20*Cos50 = 12.9 m/s. Yo = 20*sin50 = 15.3 m/s. Y = 0 m/s at max ht. KE = 0.5M*Xo^2 = 0.5*0.8*12.9^2 = 66.6 J.
August 17, 2015

Physics
Impulse = F*t.
August 16, 2015

Physics
D = 1200m[90o] + 2000[0] + 500[225]. X = 1200*Cos90 + 2000*Cos0 + 500*Cos225 = 0 + 2000 - 354 = 1646 m. Y = 1200*sin90 + 2000*sin0 + 500*sin225 = 1200 + 0 - 354 = 846 m. Tan A = Y/X = 846/1646 = 0.51397. A = D = X/Cos A.
August 16, 2015

physics
a. F = 160N/m * 0.15m = 22.5 N. b. a = F/m = 22.5/0.40 = 56.25 m/s^2.
August 16, 2015

physics
Vo = 180000,/3600s. = 50 m/s. a. V = Vo + a*t = 0. t =-Vo/a = -50/-0.4 = 125 s. b. D = Vo*t + 0.5a*t^2. D = 50*125 - 0.2*2500 = 3125 m.
August 16, 2015

science
M1*V1 + M2*V2 = M1*V + M2*V. 6.4*9.9 + 2.1*0 = 6.4V + 2.1V. Solve for V.
August 16, 2015

science
p1 = M*V = 3.4 * 9.9 = 33.7. = Momentum. p2 = 3.4 * (-4.5) = -15.3. p2-p1 = -15.3 - 33.7 = -49. Magnitude = 49. The negative sign means the momentum decreased.
August 16, 2015

math
A. d = 6t + 5t = 11 km. 11t = 11. t = 1 hr. = Time they meet. d1 = 6km/h * 1h = 6km. = Distance Rodney traveled when they met. d2 = 5km/h * 1h = 5km = Distance Ca0uls traveled. B. 6(t-1/12) + 5t = 11 km. 6t-0.5 + 5t = 11. 11t = 11.5. t = 1.045 h.
August 15, 2015

AP Physics
a. Dp + Df = 345 m. 27*(T-0.36) + 5.9T = 345. 27T-9.72 + 5.9T = 345. 32.9T = 354.72. T = 10.78 s. = Time they meet. V = Vo + a*T = 0. a = -Vo/T = -27/10.78 = -2.50 m/s^2. = Min. rate.
August 15, 2015

physics
a. V1 = Vo + a*t=12.5 + 0.450*7=15.7m/s. d1 = 12.5*7 + 0.225*7^2 = 98.5 m. b. d2 = V1*T2 = 300-98.5 = 201.5 15.7*T2 = 201.5 T2 = 12.8 s. T1+T2 = 7 + 12.8 = 19.8 s. To travel 300 m with acceleration. d = Vo*T3 = 300 m. 12.5*T3 = 300. T3 = 24 s. To travel 300 m without ...
August 15, 2015

Physics
M*g = 96.3 * 9.8=943.7 N.=Wt. of player. = Normal force(Fn). a. Fk = u*Fn = 0.619 * 943.7 = 584.2 N. b. a = u*g = 0.619 * (-9.8)=-6.07 m/s^2. V = Vo + a*t = 0. Vo = -a*t = -(-6.07)*1.0 = 6.07 m/s.
August 15, 2015

Algebra 1
The ans. is B.
August 14, 2015

Algebra 1
Y = (x+3)(x-2) = 0. x+3 = 0. x = -3. x-2 = 0. x = 2. So the ans. is a.
August 14, 2015

Algebra 1
Y = a(x-h)^2 + k = -1. a(0-4)^2 - 5 = -1 16a - 5 = -1. 16a = 4. a = 0.25. Y = 0.25(x-4)^2 - 5.
August 14, 2015

physics
R = 4m[90o] + 15m[0o] + 18m[-37o]. X = 4*Cos90 + 15*Cos0 + 18*Cos(-37o) = 0 + 15 + 14.4 = 29.4 m. Y = 4*sin90 + 15*sin0 + 18*sin(-37) = 4 + 0 -10.8 = -6.8 m. a. sqrt(X^2+Y^2)=sqrt(29.4^2+(-6.8)^2) = 30.2 m. = Magnitude. b. Tan A = Y/X = -6.8/29.4 = -0.23129. A = -13.3o = 13.3o...
August 14, 2015

physics
M*g = 14.4 * 9.8 = 141.1 N.=Wt. of sled. Fn = 141.1 - 66.9*sin32 = 105.7 N. = Normal force. Fap*Cos A-Fk = M*a. 66.9*Cos32-Fk = M*0 = 0. Fk = 56.7 N. = Force of kinetic friction. u = Fk/Fn.
August 14, 2015

physics
a. D=0.744[0o] + 0.925[270o] + 3.97[161.7o] CCW. X = 0.744+0.925*Cos270+3.97*Cos161.7 = 0.744 + 0 - 0.949 = - 0.205 km. Y = 0 + 0.925*sin270 + 3.97*sin161.7 = 0 - 0.925 + 1.25 = 0.325 km. Tan A = Y/X = 0.325/-0.205 = -1.58537. A = -57.8o = 57.8o N. of W. = 122.2o CCW D=Y/sinA=...
August 14, 2015

physics
V1 = 36,000m/3600s. = 10 m/s. V1 = a*T1 = 10 m/s. 0.5*T1 = 10. T1 = 20 s. d1 = 0.5a*T1^2 = 0.5*0.5*20^2 = 100 m. d2 = V1*T2 = 1000 m. 10 * T2 = 1000. T2 = 100 s. V = V1 + a*T3 = 0. a = -V1/T3 = -10/20 = -0.5 m/s^2. V^2 = V1^2 + 2a*d3 = 0 d3 = -V1^2/2a = -(10^2)/-1 = 100 m. d...
August 14, 2015

Math
Glad I could help.
August 13, 2015

Math
Width = W. L = 2W - 5. 2W + 2L = 62 cm. 2W + 2(2W-5) = 62. 2W + 4W - 10 = 62. 6W = 72. W = 12 cm.
August 13, 2015

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