Tuesday
November 25, 2014

Posts by henry


Total # Posts: 9,597

physics
V = Vo + a*t = 30 m/s 0 + a*4 = 30 a = 30/4 = 7.5 m/s^2.
April 1, 2014

Math
Can you clarify your problem?
April 1, 2014

Math
(150-73)/150 = 0.51 = 51%
April 1, 2014

science
750W * 1hp/746W = 1.0 hp.
March 31, 2014

math
post it.
March 31, 2014

phisecs
Power = 19kW = 19000W = 19,000 Joules/s. Power = F*V = F * 29 = 19,000 J./s F = 19,000/29 = 655.2 N.
March 31, 2014

phisecs
a = (V^2-V0^2)/2d a = (0-17^2)/40 = - 7.23 m/s^2.
March 31, 2014

algebra
x-1 = x+5 x-x = 5+1 0 = 6. No Solution.
March 30, 2014

Physics
What is the mass of the crate?
March 30, 2014

Physics
V=90mi/h * 1600m/mi * 1h/3600s.= 40 m/s. a = (V-Vo)/t = (40-0)/0.5 = 80 m/s^2.
March 29, 2014

Physics
Work = F*h = mg * h = 6*9.8 * 4=235.2 J. Work = F*h = 12 * 5 = 60 J. Work = 5*8 = 40 J. PE = mg*h = 5 * 8 = 40 J.
March 28, 2014

Physics
L = V/F = 199 m. F = V/199 = 300*10^6/199=1.51*10^6 cy/s= 1.51*10^6 Hz. WL = 1/WC C = 1/W^2*L C=1/(6.28*1.51*10^6)^2*785*10^-6=0.0142 nanofarads.
March 28, 2014

World History
What role did the Jacobins play in the French Revolution? The Jacobins reached an agreement with moderate French leaders to end the revolution. The Jacobins opened French gov't to full participation by women. The Jacobins returned France to a monarchy by supporting ...
March 27, 2014

History
How was James I's rule of England similar to peter the great's rule of Russia? Both reduces the size of their empire. Both increased their own power without approval by other government entitles. Both relied heavily on the opinions of their subjects when making ...
March 27, 2014

Electricity
Q = C*V = 10*10^-9F * 5V = 50*10^-9 Coulombs.
March 27, 2014

math
Got it! thanks
March 26, 2014

math
for the line segment whose endpoints are r(1,2) and s(6,7), find the point located 3/4 the distance from r to s.
March 26, 2014

math 2
Thank you so much reiny : )
March 26, 2014

math 2
A segment with endpoints C (3,4) and D (11,3) is divided by a point E such that CE and DE form a 3:5 ratio. Find E.
March 26, 2014

math
So I continued working where you left off and got y=0.5x+2.5 is that correct? or is it y=0.5x-2.5? I am pretty sure that it is the first one but I just wanna make sure.
March 26, 2014

math
Write an equation of a line perpendicular to line AB below in slope-intercept form that passes through the point (7, 6). A (0,1) B (-2,5)
March 26, 2014

Math
Wow thanks! It is correct! :D
March 26, 2014

Math
Write an equation of a line perpendicular to y=1/2x-5 in slope-intercept form that passes through the point (2, -7).
March 26, 2014

6th Grade Math
Blue = 3/10 Red = 4/10 = 2/5 Green = 3/10
March 26, 2014

Physics
h = Vo*t + 0.5g*t^2 = 2 m. 0 + 4.9*t^2 = 2 t^2 = 0.4082 t = 0.639 s. = Fall time. V = Vo + g*t = g*t. g = 10 m/s^2 Use the following points for graphing. (t,v) = (0,0), (0.2,2), (0.3,3),(0.5,5), (0.6,6).
March 26, 2014

math
P = (Po*r*t)/(1-(1+r)^-t) Po = Initial principal = $199,000 r = (7.01%/12)/100% = 0.00584 = Monthly % rate expressed as a decimal. t = 25yrs * 12mo/yr. = 300 Months. Plug the above values into the given Eq. and get: P = $422,328.10 Int.(Tot.) = P-Po = $223,328.10 Monthly ...
March 26, 2014

Physical science
See Related Questions: Wed,9-25-13,3:20 PM.
March 26, 2014

physics
Ingrid: 2h, 21min, 06s = Blake-: 2h, 06min, 50s = 2h, 20min, 66s 2h, 06min, 50s Diff. = 14min, 16s. = = 14.267min = Blake's winning margin. Tb = 120 + 6 + 50/60 = 126.833min = Blake's time. Vb = d/Tb = 42,195m/126.833min = 332.681 m/min = Blake's speed. d = 332....
March 25, 2014

physics
See Related Questions: Fri,3-21-14,8:55 PM.
March 24, 2014

Physics
m*g = 115 * 9.8 = 1127 N. = Wt. of box. Fn = 1127*cos46 = 782.9 N. = Normal force.
March 24, 2014

physics
Circumference = pi*D = 3.14 * 0.7m = 2.20 m. b. Va = 2m/s * 6.28rad/2.20m=5.71 rad/s = Angular velocity.
March 24, 2014

physics
h = (V^2-Vo^2)/2g = (0-(8^2))/-19.6 = 3.27 m.
March 24, 2014

physics
d = 0.5g*t^2 = 20-12 = 8 m. 4.9t^2 = 8 t^2 = 1.63 t = 1.28 s. = Fall time. Range = V*t = 4m/s * 1.28s = 5.12 m. 5.12m > 5 m. Therefore, he will make it.
March 23, 2014

math
Eq1: 5x - y = 20 Eq2: 4x + 3y = 16 Multiply Eq1 by 3 and add the Eqs: 15x - 3y = 60 +4x + 3y = 16 Sum: 19x = 76 X = 4 In Eq1, replace x with 4 and solve for y: 5*4 - y = 20 20-y = 20 Y = 0. Solution: (x,y) = (4,0).
March 23, 2014

physics
See Related Questions:Fri,3-21-14,8:55PM
March 23, 2014

Physics
Vo = 50m/s[37o] Xo = 50*cos37 = 39.93 m/s. Yo = 50*sin37 = 30.09 m/s. Tr = (Y-Yo)/g = (0-30.09)/-9.8 = 3.07 s = Rise time. Tf = Tr = 3.07 s. = Fall time. T = Tr+Tf = 3.07 + 3.07 = 6.14 s. = Time in air. d = Xo*T = 39.93m/s * 6.14s = 245.2 m. = Total dist. traveled.
March 23, 2014

trigonometry
The ladder is the hyp. of a rt. triangle X = ? Y1 = 8 Ft. Y2 = 84-8 = 76 Ft. A = 60o Tan 60 = Y2/X = 76/X X = 76/Tan60 = 43.88 Ft. = Dist. from bldg.
March 23, 2014

Physics
h=(V^2-Vo^2)/2g = (0-(8^2))/-19.6=3.27 m
March 23, 2014

physics
V = d/t = (t^3-3t^2+2)/4=(4^3-3*4^2+2)/4 = 4.5 m/s.
March 23, 2014

physics
a. 1.5km * 1000m/km * 1*10^6um/m = 1.5*10^9 Microns. b. 1.5um * 1m/10^6um * 100cm/m = 1.5*10^-4 cm c. 1.5yds * 3Ft/yd * 1m/3.3Ft * 10^6um/m = 1.364*10^6 Microns.
March 23, 2014

physics
h=(V^2-Vo^2)/2g = (0-(-8^2)/-19.6 = 3.27 m.
March 23, 2014

physics
T = 3 25/60 + (7 35/60-3 25/60) T = 3.417 + (7.583-3.417) = 7.583 Min. = 455 s. t = (7.583-3.417)min * 60s/min = 250 s. d = V*t = 1.65m/s * 250s = 412.4 m. V = d/T = 412.4m/455s = 0.906 m/s.
March 23, 2014

math
Given: F(x) = 1 - 3x. g(x) = x^2 - 1. F(g(x)) = F(x^2-1) F(x^2-1) = 1 - 3(x^2-1) = 1 - 3x^2 + 3 = -3x^2 + 4 F(g(x)) = -3x^2 + 4
March 22, 2014

physics
m*g = 50 * 9.8 = 490 N. = Wt. of crate = Normal force (Fn). a. Fs = u*Fn + u*F*sin30 Fs = 0.75*490 + 0.375F = 367.5 + 0.375F F*cosA-Fs = m*a F*cos30-(367.5+0.375F) = m*0 = 0 0.866F-367.5-0.375F = 0 0.866F-0.375F = 367.5 0.491F = 367.5 F = 748.5 N b. Fs = 0.75*490 - 0.75*F*...
March 21, 2014

Physics
V^2 = Vo^2 + 2g*h V^2 = 20^2 - 19.6*15 = 106 V = 10.30 m/s.
March 21, 2014

physics
a = (V^2-Vo^2)/2d a = (0-(56)^2)/0.036 = -87,111 m/s^2 F = m*a = 850 * (-87,111)=-74,044,444 N.
March 21, 2014

Physics
V = 25 + 4 = 29 km/h.
March 21, 2014

Math
Vo = 200 Ft/s = Initial velocity. g = 2*(-16) = -32 Ft/s^2. hmax = (V^2-Vo^2)/2g = (0-(200)^2)/-64 = 625 Ft. Yes, because his max. ht. is greater than the ht. of the building.
March 20, 2014

math
C = pi*2r = (22/7) * 2(7n-21) C = (44/7) * (7n-21) = (308n - 924)/7 = 44n - 132
March 20, 2014

physics
m*g = 30 * 9.8 = 294 N. = Wt of cabinet. Fs = u*mg = 0.8 * 294 = 235.2 N.
March 20, 2014

Math Help
1. x^2 - 10x + 25 = 0 25 = -5 * -5 (x-5)(x-5) = 0 x-5 = 0 X = 5 x-5 = 0 X = 5 Solution set: X = 5, and 5. 2. 2x^2 + 9x -5 = 0 A*C = 2 * -5 = -10 = -1*10 2x^2 + (-x+10x) - 5 = 0 (2x^2-x) + (10x-5) = 0 x(2x-1) + 5(2x-1) = 0 (2x-1)(x+5) = 0 2x-1 = 0 2x = 1 X = 1/2 x+5 = 0 X = -5 ...
March 20, 2014

Quick math help
1. (3p^5*5p^2) + (7p^3*2p^4) = 15p^7 + 14p^7 = 29p^7 2. (6x^2-2xy+3y^2)-(4x^2-xy-y^2) = 6x^2-2xy+3y^2 -4x^2+xy+y^2 = 2x^2 - xy + 4y^2
March 20, 2014

physics
See previous post.
March 20, 2014

physics
When resistors are connected across a voltage source, the voltage will remain constant if the internal resistance of the source is much smaller than the total resistance connected across the source.
March 20, 2014

Physics
Correction: F*cosA-Fp = m*a F*cos46-810.7 = m*0 = 0 F*cos46 = 810.7 F = 1167 N.
March 20, 2014

Physics
m*g = 115 * 9.8 = 1127 N. = Wt of box. Fp = 1127*sin46 = 810.7 N. = Force parallel to the ramp. F-Fp = m*a F - 810.7 = m*0 = 0 F = 810.7 N. Fn = 1127*cos46 = 782.9 N. = Normal force.
March 20, 2014

Physics
30days * 24h/day = 720 Hours kW * h = (60/1000)kW * 720h = 43.2 kWh Cost = 43.2kWh * 0.10/kWh = $4.32
March 20, 2014

physics
A + B = 220[0o] + 220[120o] R = 220 + 220*cos120 + (220*sin120)I = 220-110 + 190.5i = 110 + 190.5i = 220[60o].
March 20, 2014

Physics
Fo = ((Vs+Vo)/(Vs-Vt))*Ft = 122 Hz ((340+0)/(340-Vt))*118 = 122 (340/(340-Vt))*118 = 122 40,120/(340-Vt) = 122 41,480-122Vt = 40,120 -122Vt = 40,120 - 41,480 = -1360 Vt = 11.15 m/s. = Velocity of the train.
March 20, 2014

physics
Speed = 1/0.005 = 200 On-States/s.
March 20, 2014

Science
d = V*T = 7.83*10^10 m. 3*10^8m/s * T = 7.83*10^10 T = 2.61*10^2 = 261 s. = 4.35 min.
March 20, 2014

Algebra
See previous post.
March 19, 2014

Algebra
F(-5,1), V(-2,1) VF = -5-(-2) = -3 = 1/4a 1/4a = -3 4a = -1/3 a = -1/12 = p. X = a(y-k)^2 + h X = (-1/12)(y-1)^2 - 2. Vertex Form.
March 19, 2014

Physics
X = -69 km/h Y = 215 km/h Tan Ar = Y/X = 215/-69 = -3.11594 Ar = -72.21o = Reference angle. A = -72.21 + 180 = 107.8o V=Y/sinA = 215/sin107.8=225.8km/h[107.8]
March 19, 2014

phsyics
Coefficient of Linear Exp.=(3.6*10^-5)/3 = 1.2*10^-5/C. L = Lo + a*(T-To)Lo L = 17 + 1.2*10^-5*(5-100)17 = 17 - 0.0194 = 16.981 m.
March 19, 2014

Dont I need more info for this Math problem??
Since the compounding frequency was not given, you'll have to use simple interest. P = Po + Po*r*t P=2,000 + 2000*0.03*4=2000 + 240 = 2240. Always show the Eq before plugging-in the values.
March 19, 2014

phsyics
a. Circumference = pi*2r = 3.14*2r = 6.28r V = C/t = 2pi*r/t b. V = 6.28*100m/14s = 45 m/s.
March 19, 2014

phsyics
a. V = Vp+Vw = 60 + (-40) = 20 km/h. b. V = 60 + 40 = 100 km/h.
March 19, 2014

physics
Vb = (Dc/Dw)*Vc = (100/1000)*Vc = 3 m^3 0.1Vc = 3 Vc = 30 m^3. = Vol. of cylinder.
March 19, 2014

Physical Science
P = V*I = 110 * 15
March 19, 2014

physics
Vo = 6.93 m/s[45.6o] Xo = 6.93*cos45.6 = 4.85 m/s Yo = 6,93*sin45.6 = 4.95 m/s. h = (Y^2-Yo^2)/2g = (0-4.95^2)/-19.6 = 1.25 m.
March 19, 2014

physic
a. KE = 0.5m*V^2 = 0.5m*0 = 0 J. The velocity is zero at the max. ht. b. V^2 = Vo^2 + 2g*h V^2 = 41.8^2 - 19.6*(34.5-8.88) V^2 = 1245.09 V = 35.29 m/s.
March 19, 2014

Physics
V^2 = Vo^2 + 2g*h = 0 at peak. Vo^2 - 19.6*16.6 = 0 Vo^2 = 325.4 Vo = 18.04 m/s = Speed at which ball was kicked.
March 18, 2014

PHysiscs
Fn = m*g = (83.5+68+62+55) * 9.8
March 18, 2014

Maths
10km[0o].
March 18, 2014

Physics
Circumference = pi * 2r = 3.14 * 0.20 = 0.6283 m/rev. Va = 24m/s * 6.28rad/0.6283m = 240 rad/s = Angular velocity. V = 24m/s * 1rev/0.6283m * 60s/min = 2292 RPM.
March 17, 2014

Physics
Circumference = pi * 2r = 3.14 * 0.620 = 1.95 m/rev. 8.5*10^7m * 1rev/1.95m = 4.36*10^7 Revs = 43.6 Million Revs.
March 17, 2014

Physics
a. Y^2 = Yo^2 + 2g*h = 0 m/s @ max. ht. Yo^2 - 19.6*0.750 = 0 Yo^2 = 14.7 Yo = 3.83 m/s. = Initial ver. velocity. b. Y = Yo + g*Tr = 0 m/s @ max. ht. Y = 3.83 - 9.8Tr = 0 9.8Tr = 3.83 Tr = 0.3908 s. = Rise time. Dx=Xo * Tr = 5m/s * 0.3908s. = 1.95 m. From basket.
March 17, 2014

Physics
Range = Vo^2*sin(2A)/g = 78 m. 34^2*sin(2A)/9.8 = 78 Solve for A.
March 17, 2014

PHYSICS
See previous post: Mon,3-17-14,8:03 PM.
March 17, 2014

Physics
m*g = 20 N. m = 20/g = 20/9.8 = 2.041 kg A. Work = 0.5m*Vo^2 - 0.5m*V^2 = mg*h 1.02*Vo^2 - 1.02*25^2 = 20*14.8 1.02Vo^2 - 637.5 = 290 1.02Vo^2 = 290 + 637.5 = 927.5 Vo^2 = 909.31 Vo = 30.15 m/s. B. h = (V^2-Vo^2)/2g = (0-30.15^2)/-19.6 = 46.38 m.
March 17, 2014

physics
Ratio = (331+0.6T1)/(331+0.6T2) = (331+0)/(331+60) = 0.847
March 17, 2014

math
-16t^2 + 120t = 0 Use Quadratic Formula and get: Tr = 3.75 s. = Rise time or time to reach max ht. Tf = Tr = 3.75 s. = Fall time. T = Tr + Tf = 3.75 + 3.75 = 7.50 s. To strike gnd.
March 17, 2014

physics
1. 15 - 6 = 9 N. = Net force. 2. a = Fn/m = 9/3 = 3 m/s^2.
March 16, 2014

physics
F = m*a = 60 * 2.5 = 150 N. V = Vo + a*t = 0 + 2.5*4 = 10 m/s.
March 14, 2014

physics
a=(V^2-Vo)/2d = (0-20^2)/1000=-0.4 m/s^2 F = m*a = 10000 * -0.4 = -4,000 N.
March 14, 2014

Physics
V = Vo + a*t = 0 + 0.3*30 = 9 m/s. d = (V^2-Vo^2)/2a = (9^2-0)/0.6 = 135 m.
March 14, 2014

math
F(x) = 5x^2 + 8x + 5 = 0 Quadratic Formula: X = (-B +- sqrt(B^2-4AC))/2a X = (-8 +- sqrt(64-100))/10 = (-8 +- sqrt(36*(-1))/10 = (-8 +- 6i)/10 = -0.8 +- 0.6i = -0.8 + 0.6i, and -0.8 - 0.6i. So we have 2 imaginary solutions.
March 14, 2014

math
x^2 + 5x - 2 < 0 Solve and graph: x^2 + 5x - 2 = 0 Use Quadratic Formula an get: X = -5.37, and 0.372 Solution to inequality:-5.37 < X < 0.372
March 14, 2014

physics
m*g = 15.7 * 9.8 = 153.9 N. = Wt. of block. Fn = 153.9*cos12.1 = 150.4 N.
March 14, 2014

Physics
PEmax=mg*hmax = 28*9.8 * 159=43,630 J. = KEmax @ bottom of hill with no friction. KE = 14*31.3^2 = 13,716 J. Energy lost = 43,630 - 13,716=29,914 J.
March 14, 2014

physics-impulse
Impulse = 2*m*V*cos45
March 14, 2014

Physics
Energy = m*g*h.
March 14, 2014

math
0.002N = 76 N = 38,000
March 14, 2014

math
GP = 22/day*6days + 0.18*2766.50 =
March 14, 2014

Physics
m*g = 295 * 9.8 = 2891 N. = Wt. of box. = Fn = Normal force. Fs = u*Fn = 0.2 * 2891 = 578.2 N. = Force of static friction. Fe-Fs = m*a Fe - 578.2 = m*0 = 0 Fe = 578.2 N. = Force of engine. Energy=Work = Fe*d = 578.2 * 2.8=1619 J.
March 14, 2014

Algebra
1. 18 = 1*18 = 1*2*9 = 1*2*3*3. Factors: N = {1,2,3,9,18}. 3a. 5.25x => 252 4a. Inequality: 88 < (78+93+x)/3 < 90 264 < 171 + x < 270 93 < X < 99 The inequality says: (78+93+x)/3 is greater than 88 but less than 90.
March 13, 2014

physics
V = Vo + g*t = 0 + 9.8*3 = 29.4 m/s
March 13, 2014

phys
m*g = 12kg * 9.8N/kg = 117.6 N. = Wt. of the crate. Fs = u*mg = 0.4 * 117.6 = 47.04 N. = Force of static friction. F*cos(-30) - Fs = m*a 0.8669F - 47.04 = m*0 = 0 0.866F = 47.04 F = 54.32 N.
March 12, 2014

Science... plz help~!
F = m*a = 40 * 10 = 400 N.
March 12, 2014

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