Friday
September 19, 2014

Posts by Henry


Total # Posts: 9,094

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

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.
January 24, 2014

Math Interest Question
AMT = 1.095 * $8,532 =
January 24, 2014

Physics
m*g = 8.35 N. 1.25 * g = 8.35 g = 6.68 m/s^2.
January 23, 2014

physics
V^2 = Vo^2 + 2g*d. Solve for V.
January 23, 2014

Physics
A. a=(V-Vo)/t = (0-30)/0.005=-6000 m/s^2 B. F = m*a = 0.145 * (-6000) = -870 N.
January 23, 2014

Physics
See previous post.
January 23, 2014

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...
January 23, 2014

physics
a. V = Vo + a*t = 0 24.5 - 2*t = 0 2t = 24.5 t = 12.25 s. b. d = Vo*t + 0.5a*t^2 d = 24.5*12.25 -0.5*2*12.25^2 = 150 m. c. d = 41.6 + 150 = 191.6 m. = Required stopping distance. V^2 = Vo^2 + 2a*d a=(V^2-Vo^2)/2d=(0-29.6^2)/383.2 = -2.29 m/s^2. d. V = Vo + a*t = 0 @ stopping ...
January 23, 2014

Physics
d = Vo*t + (V^2-Vo^2)/2a d = 20*0.8 + (0-20^2)/-14 = 44.6 m.
January 22, 2014

Physics
a = (V-Vo)/t = 5-0)/4.5 = 1.11 m/s^2. d1 = 0.5a*t^2 = 0.5*1.11*4.5^2=11.25 m. d2 = 5m/s * 4.5s = 22.5 m. D = d1 + d2 = 11.25 + 22.5 = 33.75 m.
January 22, 2014

Algebra 1
X = Total students. Eq: x/8 = 2 X = 16 Students.
January 22, 2014

geometry
A(0.0),B(0,2k),C(2h,0),P(h,k). (AP)^2 = (h-0)^2 + (k-0)^2 = h^2 + k^2 Ap = sqrt(h^2+k^2). (BP)^2=(h-0)^2 + (k-2k)^2=h^2 + (-k^2) BP = sqrt(h^2+(-k)^2). (CP)^2=(h-2h)^2 + (k-0)^2=(-h)^2 + k^2 CP = sqrt((-h)^2+k^2).
January 22, 2014

Math
P1-P2 = 5x+3 (-3x^2+4x+1) - P2 = 5x+3 P2 = (-3x^2+4x+1)-(5x+3) = -3x^2-x-2 = Polynomial # 2.
January 22, 2014

physics
Distance = 54m/lap * 77laps = 4158 m. Displacement = Df-Do = 0-0 = 0. Do = Starting point. Df = Final distance from starting point. V = D/t = 0/1.5 = 0 r = d/t = 4158/1.5 = 2772 m/h.=1.73 mi/h
January 21, 2014

Physics
F. V3 = 4 + 3 = 7. To add them directly, both must be on the X-axis.
January 21, 2014

math
Similar figures have the same shape but the size is usually different.
January 21, 2014

Math
An Eq is a mathematical statement that says two quantities are equal. The inequality says they are unequal(> or<).
January 21, 2014

math
Given: AC = 2x-5.3 Ft.
January 21, 2014

math
Given: AC = 2x-5.3 Ft.
January 21, 2014

algebra 1
7X-2y=-39 X+5y=5
January 21, 2014

Algebra
The Present: Son: X yrs old. Father: 7X yrs old. A year ago: Son: (x-1) yrs old. Father: 9(X-1) yrs old. The difference between their ages is the same as last year: 7x-x = 9(x-1)-(x-1) 6x = 9x-9-x+1 -2x = -8 X = 4 yrs = The son's age.
January 21, 2014

physics
d = 350 100 = 250 m. = Braking distance. a=(V^2-Vo^3)/2d=(0-60^2)/500=-7.2 m/s^2
January 21, 2014

physics
Vw=(10kg-4kg) * 1m^3/1000kg = 0.006 m^3 = Vol. of water displaced = Vol. of the object submerged. Do = 6kg/0.006m^3 = 1000kg/m^3 = Density of the object. = Density of water(Dw). Do/Dw * Vo = 0.006 m^3 (1000/1000) * Vo = 0.006m^3 Vo = 0.006 m^3 = Vol. of the object. So the ...
January 21, 2014

physics
What is the mass of the object?
January 21, 2014

physics
Vo = 85m/s[15o] Xo = 85*cos15 = 82.1 m/s. Yo = 85*sin15 = 22 m/s. Y = Yo + g8*Tr = 0 @ max ht. 22 - 9.8Tr = 0 9.8Tr = 22 Tr = 2.24 s. = Rise time. 0.5g*Tf^2 = h max = 37.7 m. 4.9Tf^2 = 37.7 Tf^2 = 7.69 Tf = 2.77 s. = Fall time. T = Tr + Tf = 2.24 + 2.77 = 5 s. = Flight time. h...
January 20, 2014

physic
T = 330/100 = 3.30 s. = The Period. T^2 = 4*pi^2(L/g) = 3.3^2 = 10.89 39.5(1.2/g) = 10.89 47.4/g = 10.89 10.89g = 47.4 g = 4.35 m/s^2
January 20, 2014

physic
Freq. = 1000rev/0.0876s = 11,416rev/s = 11,416 cycles/s = 11,416 Hz.
January 20, 2014

math
15x^2 - 102x = 3 Divide both sides by 3: 5x^2 - 34x = 1 5x^2 - 34x - 1 = 0 X = 6.83, and -0.03(Used Quad. Formula)
January 20, 2014

college math HELP!!!!!
P = -x/25 + 190 = -2250/25 + 190 = $100. = Equilibrium price. Check: P = x/75 + 70 = 100 x/75 = 30 X = 2250 Units.
January 20, 2014

Physics
When an object is placed on a ramp; the friction is ,usually, a fraction of the component of weight perpendicular to the ramp. This fraction is call the coefficient of friction(u). Mathematically, Fk = u*Fn where Fn is the Normal and is perpendicular to the ramp. Fk is the ...
January 19, 2014

physics
mass = 155/1000 = 0.155 kg. V = 95mi/3600s * 1600m/mi = 42.2 m/s. Momentum=m*V = 0.155 * 42.2=6.54 kg.m/s
January 19, 2014

Physics
16.9m[225o] 33.8m[0o] 50.7m[50.9o] X=16.9*cos225+33.8+50.7*cos50.9=53.8 m. Y=16.9*sin225+0+50.7*sin50.9 = 27.4 m. tan A = Y/X = 27.4/53.8 = 0.50921 A = 27o D = X/cos A = 53.8/cos27 = 60.38 m.
January 19, 2014

physics
r = (0.5*150)/1000 = 0.075 m Vc=pi*r^2*h=3.14*0.075^2*1=0.01767 m^3 = Vol. of the cylinder. Vs = 2/3 * 0.01767 = 0.01178 m^3 = Vol. submerged = Vol. of water displaced. 0.01178m^3 * 1000kg/m^3 = 11.78 kg = mass of water displaced. m*g = 11.78kg * 9.8N/kg = 115.4 N = Wt. of ...
January 19, 2014

Physics
See previous post: Sun,1-19-14,2:30PM.
January 19, 2014

Physics
L = V*T = V/F = 340/170 = 2 m.
January 19, 2014

physics- multiple choice
1a. 2e. 3c.
January 19, 2014

physics
X = 10 N. Y = 20 N. tan A = Y/X = 20/10 = 2.0 A = 63.43o R=Y/sin A = 20/sin63.43 = 22.4N[63.43o] a
January 19, 2014

physics
d = r*t = 14 r = 14/t = 14/(0.0056/2) = 5000 m/s.
January 19, 2014

Science
a. When they are acting in the same direction. F = 5+7 = 12 N. b. When they are acting in opposite directions. F = 7-5 = 2 N.
January 19, 2014

Maths
Correction: x = -5. Eq: Y = -5UD
January 19, 2014

Maths
m = UD X = -5 Y = mx + b Y = UD5 + 0 Y = UD5 Y = 8 is a hor. line. b = 8 = Y-intercept m = 0 = The slope of a hor. line. Use the following points for graphing: (-4,8) (-2,8) (0,8) (2,8) (4,8) Note: Y is constant and does not vary; it remains at 8 for all values of X. y =
January 19, 2014

Physics Please check my answers
Are all the other correct?
January 17, 2014

Physics Please check my answers
1. Circumference=Pi*D=3.14 * 16=50.27 m. V = 15rev/60s * 50.27m/rev = 12.56 m/s. 2. 0.5*5*t^2 = 20*t 2.5t^2 - 20t = 0 t = 8 s. (Use Quad. Formula). d = 20 * 8 = 160 m. 3. d = Yo*t + 4.9*t^2 d = -10*2.5 + 4.9*2.5^2 = 4. 1. 5. Work = !0*F*d = 10*(mg)*d Work = 10*(1960)*1 = 19,...
January 17, 2014

algebra
Y = (1/4)x + 2 Y = (1/4)x m1 = m2 = 1/4 The lines are parallel, because their slopes are equal.
January 17, 2014

Earth Science
Mass of silver=5cm^3 * 10.5g/cm^3=52.5g. Mass of gold=5cm^3 * 19.3g/cm^3 = 96.5g.
January 17, 2014

physics
Work = F*d = 335 * 2.07 = 693.5 J.
January 17, 2014

Physics
Vs = 0.3kg * 1m^3/100kg = 0.003 m^3 = Vol. of Styrofoam = Vol. of water Dis- placed. Mass = 0.003m^3 * 100kg/m^3 = 0.3 kg. T = 0.3kg * 9.8N/kg = 2.94 N. Note: Density of water = 1000kg/m^3.
January 17, 2014

Finance
Rate = $X per hour. Pay = 28X + 253 = 400 28x = 400 - 253 = 147 X = $5.25 per hour.
January 17, 2014

QUANTITATIVE REASONING FOR BUSINESS
D = P-T
January 17, 2014

math
Equivalent fraction = 6/8. (6/8)/(1/8) = 6/8 * 8/1 = 6 Strips.
January 16, 2014

Physics
h = ho + (V^2-Vo^2)/2g h = 1.75 + (0-19^2)/19.6 = 20.17 m. Xo = 8 m/s = Hor. component of initial velocity. Yo = Ver. component of initial velocity. Vo = 19 m/s = Total initial velocity. cos A = Xo/Vo = 8/19 = 0.42105 A = 65.1o = Angle at which rock is thrown. Yo = Vo*sin A = ...
January 16, 2014

Geometry - 8th grade
Total Degrees = (N-2)*180 = (5-2)180=540 Missing Angle = 540-(85+110+135+95)=115o
January 16, 2014

Math
X Heads to start with. (X-24) = Bal. (X-24) - 2/7(X-24) = 5/7(x-24). 5/7(X-24) = X/2 Multiply both sides by 14: 10x-240 = 7x 3x = 240 X = 80 Heads of lettuce.
January 16, 2014

PHYSICS
Assuming no friction: KE = PE = mg*h = (5*9.8)*10=490 Joules.
January 16, 2014

Algebra
d1 = (Vb-4)t = 20 Eq1: Vb*t - 4t = 20 d2 = (Vb+4)t = 60 Eq2: Vb*t + 4t = 60 Multiply Eq1 by -1: -Vb*t + 4t = -20 +Vb*t + 4t = 60 Sum:0 + 8t = 40 t = 5 h. In Eq1, replace t with 5: Vb*5 - 4*5 = 20 5Vb = 40 Vb = 8 mi/h = Velocity of the boat.
January 15, 2014

Physics
d = Xo*T = 68 m. Xo * 2.276 = 68 Xo = 29.9 m/s. = Hor. component of initial velocity. Vo = Xo/cosA = 29.9/cos20.5 = 31.9 m/s = Initial velocity. Impulse = m*Vo = 0.27 * 31.9 = 8.61 kg.m/s.
January 15, 2014

physics
PE = mg*h = 17*9.8*3.5 = 583.1 Joules. KEo = 583.1 J. , No friction. KE = 0.5m*V^2 = 8.5*4.5^2 = 172.1 J., With friction. KE Lost = KEo-KE = 583.1-172.1 = 411 J. = Work done by friction.
January 15, 2014

pre cal
a. C = 8.48x + 5.69 b. (X,C),(0,5.69),(50,429.69),Add more points for graphing. c. C = 8.48*200 + 5.69 = $1701.69 d. Same procedure as c. e. Slope = 8.48
January 15, 2014

math
Tia collected $10 for a walkathon and $ 5 from each friend. What is the total amount of donations she collected from 4 friends? Is my answer below correct? Friend - 1,2,3,4 Donations - $5, $5, $5, $5 = $20 Answer is $20 from 4 friends.
January 14, 2014

physics
V^2 = Vo^2 + 2a*d a = (V^2-Vo^2)/2d a = (46.5^2-0)/89.6 = 24.13 m/s^2 F = m*a = 57 * 24.13 = 1376 N.
January 14, 2014

physics
What do you want to know?
January 14, 2014

Pre-Calc
b. d = 80t - 16t^2 = 96 -16t^2 + 80t - 96 = 0 Divide both sides by 16: -t^2 + 5t - 6 = 0 Use Quadratic Formula and get: t = 2s, and 3 s. Interval: 2< T <3. c. h = (V^2-Vo^2)/2g h = (0-80^2)/64 = 100 Ft. d. V = Vo + g*t = 0 at max ht. t = -Vo/g = -80/-32 = 2.50 s.
January 14, 2014

math
Tia collected $10 for a walkathon and $ 5 from each friend. What is the total amount of donations she collected from 4 friends? Is my answer below correct? Friend - 1,2,3,4 Donations - $5, $5, $5, $5 = $20 Answer is $20 from 4 friends.
January 14, 2014

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