Friday
July 25, 2014

Posts by Henry


Total # Posts: 8,898

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.

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.

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.

physics
Incomplete.

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.

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

science
d = 0.5g*t^2 = 4.9*2^2 = 19.6 m.

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]

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

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.

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

physics
d = 5050m/s * 0.0944s = 476.7 m. 476.7/91.4 = 5.22 Football fields.

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

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

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

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

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

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

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

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

math
See previous post.

mah
P = Po + Po*r*t P = 8000 + 8000*0.09*18. Solve for P.

physics
See previous post.

physics
I need to know the angles.

physics
See previous post.

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

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 = 6.1...

physics
PE = F*h = mg*h = 98*10 = 980 Joules.

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.

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.

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...

physics
50N[50o] X = 50*cos50 Y = 50*sin50

Physical sciences
F = 10 + 30 = 40 N.

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.

PHYSICS
Please check your problem for errors.

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

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

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].

physics
31m/s[44o] X = 31*cos44 = Y = 31*sin44 =

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

Physıcs
F = m*a a = acceleration. m=mass of the object being accelerated.

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

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

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...

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

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 = -40.64/2...

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

Math
Correct.

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

science
a. F = m * a. Newtons .

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).

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.

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.

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.

Math
See previous post.

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

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

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

science
Work = F*d = mg*d = 210 * 7 = 1470 J.

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.

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.

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

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

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...

physic
Avg. speed = d/t = 6.8/2.4 = 2.83 m/s.

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

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...

physics
Fn = m*g*cos27.5

Physics
See previous post.

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

physics
Fn = 2*450*cos 15 = 869.3 N.

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

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.

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.

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

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 A...

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.

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

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

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 yo...

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...

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...

physical acience
D = 360g/74cm^3 = 4.86 g/cm^3.

Science
See 9:59 AM post.

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

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.

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]

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] = 8...

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.

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.

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

physics
c^2 = a^2 + b^2 = 3.8^2 + 8.1^2 =

science
B.

science
a=(V-Vo)/t = (12.4-0)/3.77 = 3.29 m/s^2 d = 0.5*3.29*3.77^2 = 23.37 m. Work = F*d = (m*g) * d=(1920*9.8)23.37 = 439,805 Joules.

Math Interest Question
AMT = 1.095 * $8,532 =

Physics
m*g = 8.35 N. 1.25 * g = 8.35 g = 6.68 m/s^2.

physics
V^2 = Vo^2 + 2g*d. Solve for V.

Physics
A. a=(V-Vo)/t = (0-30)/0.005=-6000 m/s^2 B. F = m*a = 0.145 * (-6000) = -870 N.

Physics
See previous post.

Physics
a. h = Vo*t + 0.5g*t^2 = 9 18t - 4.9t^2 = 9 -4.9t^2 + 18t - 9 = 0 t=0.597 s. and 3.08 s(Use quad. formula) Choose t = 0.597 s since the apple reaches its max ht. of 16.5 m, in 1.84 s. V = Vo + g*t = 0 @ max ht. 18 - 9.8*t = 0 9.8t = 18 Tr = 1.84 s. = Rise time. b. If student A...

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Search
Members