Friday
November 21, 2014

Posts by henry


Total # Posts: 9,562

Physics
a. d = Vo*t + 0.5a*t^2 = 11.5 m. 0 + 0.5a*5.4^2 = 11.5 14.58a = 11.5 a = 0.789 m/s^2 m = F/a = 73/0.789 = 92.55 kg. b. V=Vo + a*t = 0 + 0.789*5.4=4.26 m/s. d = Vo*t = 4.26 m/s * 4.20s = 17.89 m.
February 7, 2014

Physics
m = 2.5 kg h = 1.7 m. Work=F*h = mg*h = 2.5*9.8*1.7=41.65 J. No work is done when can is stationary.
February 7, 2014

physics
X = 4.3 m/s. A = 44o V = X/cosA = 4.3/cos44 = 5.98 m/s = Total velocity.
February 7, 2014

math
9pages/15min = 0.6 Pages/min. 198pages * 1min./0.6pages = 330 min. reading. (330min/30min) * 5min = 55 min. on break. 330 + 55 = 385 min = 6 hours-25 min consumed. 8:00 AM + 6:25 = 14:25=2:25 PM.= Finish time.
February 6, 2014

Science
Ratio = 200/20 = 10/1. 10 Loops on Primary and 1 loop on Secondary. p
February 6, 2014

physics
Series: Ct = 4.98*8.98/(4.98+8.98) = 3.20 uF. Parallel: Ct = 4.98 + 8.98 = 13.96 uF.
February 6, 2014

math
2/9/(3/5) = X/1 X = 2/9 * 5/3 = 10/27 gal.
February 6, 2014

Physics
x^2 + 2x - 35 = 0 -35 = -1*35 = -5*7. Choose the pair of factors whose sum = 2, the coefficient of X. (x-5)(x+7) = 0 x-5 = 0 X = 5. x+7 = 0 X = -7. Solution Set: X = -7, and 5.
February 6, 2014

Physics
See Related Questions: Mon,9-5-11,11:19 PM.
February 6, 2014

trig
h = 80*sin40
February 5, 2014

Physics
See Related Questions: Fri, 9-9-11,11:20 AM.
February 5, 2014

Physics
What is the question?
February 5, 2014

Physics
a. a = (V^2-Vo^2)/2d a = (30.9^2-21^2)/382 = 1.35 m/s^2. b. 21 + 1.35t = 30.9 1.35t = 9.9 t = 7.33 s.
February 5, 2014

physics
a. h1 = 0.5a*t^2 = 7.5*21^2 = 3308 m V = a*t = 15 * 21 = 315 m/s. hmax = h1 + (V^2-Vo^2)/2g = 3308 + (0-315^2)/-19.6 = 8371 m.
February 5, 2014

Physics
Vo = 17.9m/s[39o] Xo = 17.9*cos39 = 13.91 m/s. Yo = 17.9*sin39 = 11.26 m/s. Y = Yo + g*Tr = 0 @ max ht. 11.26 - 9.8Tr = 0 9.8Tr = 11.26 Tr = 1.15 s. = Rise time. Tf = Tr = 1.15 s. = Fall time. Tr+Tf = 1.15 + 1.15 = 2.30 s. = Time to hit gnd.
February 5, 2014

physics
Incomplete.
February 5, 2014

physics
Fn = mg*cos45 = 15 * 9.8 * cos45=104 N. = Normal force = Force perpendicular to the incline. Fk = u*Fn = 0.2 * 104 = 20.8 N.
February 5, 2014

physics
See Related Questions: Mon,2-3-13,12:14 PM.
February 5, 2014

science
d = 0.5g*t^2 = 4.9*2^2 = 19.6 m.
February 5, 2014

physics
X = -3.0km Y = 2km Tan Ar = Y/X = 2/-3 = -0.66667 Ar = -33.69o = Reference angle. A = -33.69 + 180 = 146.3o, CCW. D=X/cos A = -3/cos146.3=3.61km[146.3o]
February 3, 2014

physics
X = -200 N. Y = -150 N. Fn = sqrt((-200)^2 + (-150)^2) = 250 N.
February 3, 2014

Math
X nickels. (18-X) dimes. 5x + 10(18-X) = 125 Cents. 5x + 180 - 10x = 125 5x = 180-125 = 55 X = 11 (18-X) = 18-11 = 7.
February 3, 2014

Physics
Vo = 15m/s[35o] Yo = 15*sin35 = 8.60 m/s.
February 3, 2014

physics
d = 5050m/s * 0.0944s = 476.7 m. 476.7/91.4 = 5.22 Football fields.
February 3, 2014

phsyics
a. a = (V-Vo)/t = (3.65-0)/3.46 = 1.055 m/s^2 = Acceleration of the jogger. d1 = 0.5a*t^2 = 0.5*1.055*3.46^2=6.31 m b. a = (40.1-24)/3.46 = 4.65 m/s^2 d2 = Vo*t + 0.5a*t^2 d2=24*3.46 + 0.5*4.65*3.46^2 = 110.9 m. c. d2-d1 = 110.9-6.31 = 104.6 m. farther
February 3, 2014

Physics
a=(V-Vo)/t = (6.20-12.2)/6.70=-0.896 m/s^2.
February 3, 2014

math
See previous post.
February 3, 2014

mah
P = Po + Po*r*t P = 8000 + 8000*0.09*18. Solve for P.
February 3, 2014

physics
See previous post.
February 3, 2014

physics
I need to know the angles.
February 3, 2014

physics
See previous post.
February 3, 2014

Physics
See previous post: Mon,2-3-14,5:42 PM.
February 3, 2014

Physics 1
Vox = 5710 m/s Voy = 7490 m/s a. Hor. acceleration: Vo*t + 0.5a*t^2 = 5.78*10^6 m. 5710*910 + 0.5a*910^2 = 5.78*10^6 5.196*10^6 + 4.14*10^5a = 5.78*10^6 4.14*10^5a = 5.84*10^5 a = 1.41 m/s^2. b. Ver. acceleration: 7490*910 + 0.5a*910^2 = 6.17*10^6 6.816*10^6 + 4.14*10^5a = 6....
February 3, 2014

physics
PE = F*h = mg*h = 98*10 = 980 Joules.
February 3, 2014

Physics 1
d = Vo*t + 0.5g*t^2 = 2 m. 0 + 4.9t^2 = 2 t^2 = 0.408 Tf = 0.639 s. = Fall time. D = 5.0m/s * 0.639s = 3.19 m.
February 3, 2014

Physics
Correction: 4 Ft = 1.21 m. Not 13.2 m. hmax=1.21+8.22*0.84 - 4.9*0.84^2=4.66 m Above gnd. 0.5g*t^2 = 4.66 m. 4.9t^2 = 4.66 t^2 = 0.95 Tf = 0.97 s. = Fall time. d = 3.36m/s * (0.84+0.97) = 6.1 m.
February 3, 2014

Physics
V = Vo + g*Tr = 0 at max ht. 8.22 - 9.8Tr = 0 9.8Tr = 8.22 Tr = 0.84 s. = Rise time or time to reach max ht. hmax = ho + Vo*t + 0.5g*t^2 hmax=13.2 + 8.22*0.84 - 4.9*0.84^2=16.7 m. Above gnd. 0.5g*t^2 = 16.7 m. 4.9t^2 = 16.7 t^2 = 3.40 Tf = 1.84 s. = Fall time. d = 3.36m/s * (0...
February 3, 2014

physics
50N[50o] X = 50*cos50 Y = 50*sin50
February 3, 2014

Physical sciences
F = 10 + 30 = 40 N.
February 3, 2014

physics
V^2 = Vo^2 + 2a*d V^2 = Vo^2 - 6*24 = 0 Vo^2 = 144 Vo = 7 m/s = Initial velocity of the block = Speed of the truck.
February 3, 2014

PHYSICS
Please check your problem for errors.
February 3, 2014

science
L min. = 10.26 cm W min. = 4.91 cm H min. = 1.52 cm V nom. = 10.27 * 4.92 * 1.53=77.308 cm^3 V min. = 10.26 * 4.91 * 1.52=76.728cm^3 Error = 77.308 - 76.728 = 0.5796 cm^3 NOTE: The fractional error has no units; they cancel. Fractional Error = 0.58cm^3/77.308cm^3 = 0.0075
February 3, 2014

Physics
V^2 = Vo^2 + 2g*d = 0 + 19.6*10.1 = 198 V = 14.1 m/s.
February 2, 2014

Physics
X = -7 m/s Y = -8 m/s tan Ar = -8/-7 = 1.14286 Ar = 48.8o = Reference angle. A = 48.8 + 180 = 228.8o, CCW V = -8/sin228.8 = 10.63 m/s[228.8o].
February 2, 2014

physics
31m/s[44o] X = 31*cos44 = Y = 31*sin44 =
February 2, 2014

Physıcs
V = Vo + a*t = 17 m/s. 3 + a*5 = 17 5a = 17-3 = 14 a = 2.8 m/s^2.
February 2, 2014

Physıcs
F = m*a a = acceleration. m=mass of the object being accelerated.
February 2, 2014

physics..
V^2 = Vo^2 + 2g*h = 0 at max. ht. 40^2 - 19.6*h = 0 19.6h = 1600 h = 81.6 m.
February 1, 2014

physics
45m[90o] + 60m[180o] + 75m[270o] + 50m[0o]. X = -60 + 50 = -10 m. Y = 45 -75 = -30 m. d^2 = (-10)^2 + (-30)^2 = 1000 d = 31.62 m. Speed=d/t = 31.62m/7.433min.=4.25 m/min
February 1, 2014

physics
Vo = 37m/s[30.6o] Xo = 37*cos30.6 = 31.8 m/s. Yo = 37*sin30.6 = 18.8 m/s. a. Yo*t + 0.5g*t^2 = 8.9 m. 18.8t - 4.9t^2 = 8.9 -4.9t^2 + 18.8t - 8.9 = 0 t = 3.28 s. and heading downward. (Used Quad. formula). b. Y = Yo - g*Tr = 0 at max ht. 18.8 - 9.8*Tr = 0 9.8Tr = 18.8 Tr = 1.92...
February 1, 2014

physics
Y^2 = Yo^2 + 2g*h Y^2 = 0 + 19.6*24.93 = 488.6 Y = 22.1 m/s. Xo = 22.1/3 = 7.37 m/s.=Initial velocity
February 1, 2014

physics
V = 26m/s[-37o] A. Xo = 26*cos(-37) = 20.76 m/s. B. Xo * T = 53 m. 20.76 * T = 53 T = 2.55 s. = Fall time. Y = 26*sin(-37) = -15.65 m/s. Y = Yo + g*T = -15.65 Yo + 9.8*2.55 = -15.65 Yo = -15.65 - 24.99 = -40.64 m/s.=Vert. component of initial velocity. tan A = Yo/Xo = -40.64/...
January 31, 2014

physics
Fn = -4100 + 8000 + 1200 = 5100 N., Due East. = Net force. a = Fn/m = 5100/6800 = 0.75 m/s^2, Due East.
January 31, 2014

Math
Correct.
January 31, 2014

Physics
V = Vo + a*t = 0 43 + a*0.28 = 0 0.28a = -43 a = -153.6 m/s^2
January 31, 2014

science
a. F = m * a. Newtons .
January 31, 2014

physics
Vo*t + 0.5g*t^2 = 100-50 = 50 0 + 4.9t^2 = 50 t^2 = 10.20 t = 3.19 s. V = Vo + g*t = 0 + 9.8*3.19 = 31.3 m/s = The velocity after the 1st 50 m drop = The initial velocity (Vo) for the 2nd 50 m drop. 31.3*t + 4.9t^2 = 50 4.9t^2 + 31.3t - 50 = 0 t = 1.32 s.(Use Quad. Formula).
January 31, 2014

physics
a=(V^2-Vo^2)/2d = (640^2-0)/2.4=170,667 m/s^2. V = Vo + a*t t=(V-Vo)/a = (640-0)/170,667=0.00375 s. = 3.75 ms.
January 31, 2014

physics
Dc = Dt 0.5a*t^2 = 9.5*t 1.1t^2 = 9.5t 1.1t^2 - 9.5t = 0 t = 8.64 s. (Use Quad. formula). D = 9.5 * 8.64 = 82.1 m. V = Vo + a*t = 0 + 2.2*8.64 = 19.0 m/s.
January 31, 2014

science
Ws = 0.08m^3 * 7840kg/m^3 * 9.8=6147 N. = Wt. of the steel in air. Ww=0.08m^3 * 1000kg/m^3 * 9.8 = 784 N. = Wt. of the water displaced. Ws in water = 6147 - 784 = 5363 N.
January 30, 2014

Math
See previous post.
January 30, 2014

Math
P(1,8), m = -8. Y = mx + b = 8 -8*1 + b = 8 b = 16. Eq: Y = -8x + 16.
January 30, 2014

Physics
See previous post: Thu.,1-30-14,10:32PM.
January 30, 2014

Physics
V=25mi/h * 1609m/mi * 1h/3600s=11.17 m/s Momentum = m*V = 0.01 * 11.17 = 0.1117 m-m/s.
January 30, 2014

science
Work = F*d = mg*d = 210 * 7 = 1470 J.
January 30, 2014

physics
Vo = 8.15m/s[-19o] Xo = 8.15*cos(-19) = 7.71 m/s. Yo = 8.15*sin(-19) = -2.65 m/s. A.Dx=Xo * Tf = 7.71m/s * 2.50s=19.26 m/s B. h = Yo*T + 0.5g*T^2 h = -2.65*2.5 + 4.9*2.5^2 = 24 m. C. -2.65*T + 4.9T^2 = 24-12 = 12 4.9T^2 - 2.65T - 12 = 0 T = 1.86 s.
January 30, 2014

physical science
V = Vo + g*t = 0 @ max ht. Vo - 9.8*4.24 = 0 Vo = 41.55 m/s. = Initial velocity, up. = Final velocity, down.
January 30, 2014

science
L = Lo + a/oC(T-To)*Lo L = 0.125 + 1.9*10^-6(100-200)0.125 = 0.124976
January 30, 2014

Engineering science N4
Distance = Vo^2*sin(2A)/g = 12000 m 700^2*sin(2A)/9.8 = 12000 50000*sin(2A) = 12000 sin(2A) = 12000/50000 = 0.240 2A = 13.9o A = 6.94o
January 30, 2014

physics
V = 60km/h = 60000m/3600s = 16.7 m/s. a = (V-Vo)/t = 4.5 m/s^2 (16.7-0)/t = 4.5 t = 16.7/4.5 = 3.70 s. d1 = 0.5a*t^2 = 2.25*3.7^2 = 31 m. d2 = V*t = 16.7m/s * 180s = 3,000 m. d3 = 60 m. d1+d2+d3 = 30.8 + 3000 + 60 = 3091 m. = Total distance traveled. V^2 = Vo^2 + 2a*d a = (V^2...
January 30, 2014

physic
Avg. speed = d/t = 6.8/2.4 = 2.83 m/s.
January 29, 2014

physics
h = Vo*t + 0.5g*t^2 h = 0 + 4.9*0.75^2 = 2.76 m.
January 29, 2014

geometry
Changing a number to scientific notation gives you a number less than 10 multiplied by a power of 10: 3500 = 3.5*10^3 3.5 is less than 10; the exponent(3) means that moving the decimal 3 places to the right restores the number to standard form. 0.0035 = 3.5*10^-3. The negative...
January 29, 2014

physics
Fn = m*g*cos27.5
January 29, 2014

Physics
See previous post.
January 28, 2014

Physics
V^2 = Vo^2 + 2g*h V^2 = 0 + 19.6*50. Solve for V.
January 28, 2014

physics
Fn = 2*450*cos 15 = 869.3 N.
January 28, 2014

Physics
Vo^2*sin(2A)/g = 14 m. Vo^2*sin(92)/9.8 = 14 0.10198*Vo^2 = 14 Vo^2 = 137.3 Vo = 11.72 m/s. v
January 28, 2014

math
8/6 = 1 1/3 Slice per person. So you give each person 1 slice. Then, cut each of the remaining 2 slices into 3 pieces. Then give each person 1 piece.
January 28, 2014

Physics
V^2 = Vo^2 + 2g*d = 0 + 19.6*(10-5)=98 V = 9.90 m/s. V^2 = 0 + 19.6*10 = 196 V = 14 m/s.
January 28, 2014

physics
V = 5 * 8 * 10 = 400 m^3. Mass = 400m^3 * 1.3kg/m^3 = 520 kg.
January 28, 2014

Physics
d1 = 61km/h[0o] * (35/60)h = 35.6km[0o]. d2=61km/h[40o] * (10/60)h=10.2km[40o]. d3=61km/h[180o] * (49/60)h=49.8km[180o]. T = (35+10+49)min * 1h/60min = 1.57 h. X=35.6+10.2*cos40+49.8*cos180=-6.39km. Y = 10.2*sin40 + 49.8*sin180 = 6.56 km. tan Ar = Y/X = 6.56/-6.39 = -1.02605 ...
January 27, 2014

physics
Y = -2.15 km. R = 3.95 km. a. sin A = Y/R = -2.15/3.95 = -0.54430 A = -33o = 57o East of South. R = 3.95km[57o] East of South.
January 27, 2014

Physics
L = V/F = 489*10^-9 m. 3*10^8/4.89*10^-7 = 6.13*10^14 Hz.
January 26, 2014

physics
Fr = (Vs-Vc)/(Vs+Va)*Fa Fc = (343-32.3)/(343+60.7)*521 = 401 Hz= Freq. heard by car driver.
January 26, 2014

MATH
In a school library, there are 3 Chinese Language books for every 5 English Language books. The number of Malay Language book is 5/9 as many as the Chinese Language books. Find the ratio of the number of Malay Language books to the number of English Language books. (Express ...
January 26, 2014

physics
You are a Middle Ages cannonball scientist attacking a castle a distance D away. Your job is to get a cannonball of mass m over the walls, which are a height H above the top of the cannonball launcher. At the instant when the cannonball leaves the launcher it will be traveling...
January 26, 2014

physics
While working on your physics homework in your dorm room you notice a flowerpot fall past your window because someone has carelessly knocked it off the roof. Fortunately, you computer¡¯s video camera captured the whole thing so you can measure the total time the pot...
January 26, 2014

physical acience
D = 360g/74cm^3 = 4.86 g/cm^3.
January 26, 2014

Science
See 9:59 AM post.
January 26, 2014

Physics
Xo = 50 m/s. = Hor. component. Y = 42 m/s = Ver. component. Tot. velocity = sqrt(50^2+42^2)=65.3 m/s
January 26, 2014

Physics
0.5g*t^2 = 90 m. 4.9t^2 = 90 t^2 = 18.37 t = 4.29 s. Distance = Xo*t = 50m/s * 4.29s=214.3 m. V = Vo+g*t = 0 + 9.8*4.29 = 42 m/s.
January 26, 2014

physics
Correction: F1 = -100i F5 = -100i-54.5i-88.3 = -88.3-154.5i Tan Ar = -154.5/-88.3 = 1.74972 Ar = 60.3o = Reference angle. A = 60.3 + 180 = 240.3o F5 = X/cos A = -88.3/cos240.3 = 178.2 N. [240.3o]
January 26, 2014

physics
Resultant = F1 = 100N[270o]. F2 = 250N[320o]. F3 = 100N[60o]. F4 = 200N[140o]. F5 = ? Add to get F1. X=250*cos320+100*cos60+200*cos140=88.3N Y=250*sin320+100*sin60+200*sin140=54.5N tan A = Y/X = 54.5/88.3 = 0.61680 A = 31.7o F2+F3+F4=X/cos A = 88.3/cos 31.7 = 103.8N[31.7o] = ...
January 26, 2014

physics
Tan29.3 = (47-15.1)/(17.4+d2) (17.4+d2)*Tan29.3 = 47-15.1 = 31.9 (17.4+d2) = (47-15.1)/Tan29.3 = 56.9 d2 = 56.9-17.4 = 39.5 Ft.
January 25, 2014

college physics
V = 80km/h = 80000m/3600s = 22.22 m/s. a. V = Vo + a*t = 22.22 m/s. 0 + 1.25t = 22.22. Solve for t. b. V = Vo + a*t = 0 22.22 - 1.75*t = 0. Solve for t. c. V = Vo + a*t = 0 22.22 + a*8.30 = 0. Solve for a; it should be negative.
January 25, 2014

college physics
a. V = Vo * a*t = 10 + 0.6*7 = 14.2 m/s. b. T = d/r1 - d/r2 = 300/10-300/14.2 = 8.87 s. Saved.
January 25, 2014

physics
L = Lo + a*(T-To)Lo L = 1.4 + 1.95*10^-5(32-(-15))1.4 = 1.401283 m.
January 24, 2014

physics
c^2 = a^2 + b^2 = 3.8^2 + 8.1^2 =
January 24, 2014

science
B.
January 24, 2014

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