Tuesday
January 27, 2015

Posts by henry


Total # Posts: 9,959

physics
M1*V1 + M2*V2 = M1*V + M2*0.76 24*60.8 + 12*15.2 = 24*V + 12*0.76. Solve for V(cm/s).
January 25, 2015

physics
M1*V1 + M2*V2 = M1*V + M2*V 2100*12 + 2780*0 = 2100V + 2780V 25,200 = 4880V V = 5.16 m/s. See Related Questions: 10-30-14, 9:40 PM.
January 25, 2015

Physics
When they are acting in the same direction: 5 + 7 = 12 N.
January 25, 2015

Physics
V = 22.6km/18min * 1min/60s = 0.0209 km/s = 20.9 m/s.
January 25, 2015

College Physics
d = V*t = 0.12 m t = 0.12/V = 0.12/7*10^7=1.71*10^-5 s.
January 24, 2015

Physics
Dc = 19t = Distance of the car after t1. Dm = Vo*t + 0.5a*t^2 = Distance of motorcycle after t1. Dm = Dc + 52 Vo*t + 0.5a*t^2 = 19t + 52 19*t + 2.5*t^2 = 19t + 52 19t - 19t + 2.5*t^2 = 52 t^2 = 20.8 t = 4.56 s. So the motorcycle caught-up 4.56 s after it started to accelerate.
January 24, 2015

Physics
V1/V2 = M2/M1 = 56kg/96kg = 0.583
January 24, 2015

science
a. Fx = 3000*Cos30 = 2598 N. b. Fy = 3000*sin30 = 1500 N. = Lifting force.
January 24, 2015

Physics
See previous post: Fri, 1-23-15, 5:42 PM.
January 24, 2015

Physics
V^2 = Vo^2 + 2a*d = 0 Vo^2 = -2a*d = -2*(-7.2)*72 = 1036.8 Vo = 32.2 m/s. = Speed before braking.
January 23, 2015

math
Let g = 10 m/s^2. d = 0.5g*t^2 = 5*9^2 = 405 m.
January 23, 2015

physics
Vo = 50m/s @ A Degrees Xo = 50*Cos A Yo = 50*sin A Y^2 = Yo^2 + 2g*h = 0 @ max ht. Yo^2 = -2g*h = -2*(-9.8)*100 = 1960 Yo = 44.27 m/s = Ver. component of initial velocity. Yo = 50*sin A = 44.27 sin A = 44.27/50 = 0.88544 A = 62.3o. = Angle of projection. Y = Yo + g*Tr = 0 Tr...
January 23, 2015

science
d1 + d2 = 12 m. d1 = Vo*t + 0.5g*t^2 d2 = 0.5g*t^2 16*t - 4.9*t^2 + 4.9*t^2 = 12 16*t = 12 t = 0.75 s.
January 22, 2015

science
a = (V-Vo)/t = 30-0)/10 = 3 m/s^2
January 22, 2015

Physics
P = F * d/t = M*g * d/t = 5*9.8 * 12/15 = 39.2 J/s = 39.2 Watts.
January 22, 2015

physics
Vo[51o] Xo = 7 m/s Vo = ? Xo = Vo*Cos51 = 7 m/s Vo = 7/Cos51 = 11.12 m/s = Initial velocity. Yo = Vo*sin51 = 11.12*sin51 = 8.64 m/s.
January 22, 2015

physics
Increase = (26-(-16))C*1.7*10^-5/C*30cm = 42*1.7*10^-5 * 30cm =0.02142 cm.
January 22, 2015

math
1. (7a^5-a^3) - (a^5-5a^3-1) Remove the parenthesis: 7a^5-a^3 - a^5+5a^3+1 Combine like-terms: 6a^5 + 4a^3 + 1
January 22, 2015

Math
(3x+4)*Log2 4 = (3x+4)*2 = 6x + 8.
January 22, 2015

math
h(t) = -4t^2 + 30t + 1.4 Tr = -B/2A = -30/-8 = 3.75 s. = Rise time. Tf = Tr = 3.75 s. = Fall time. Tr+Tf = 3.75 + 3.75 = 7.5 s. To get under the ball.
January 22, 2015

Math
X Girls. (x+45) Boys. 2x/3 girls passed the test. (4/5)(x+5) = (4x/5 + 4) boys passed test 49 Children failed the test. (x - 2x/3) = x/3 = Girls that failed the test. (X+45) - (4x/5+4) = x/5+41 Boys that failed the test. X/3 + (x/5+41) = 49 x/3 + x/5 = 49-41 = 8 Multiply both ...
January 22, 2015

physics
Incomplete.
January 22, 2015

phyisics
h = 1*sin30 = = 0.5 m. V1^2 = Vo^2 + 2g*h = 0 + 19.6*0.5 = 9.8 V1 = 3.13 m/s. M1*g = 25N. M1*9.8 = 25 M1 = 2.55 kg M2*9.8 = 40N. M2 = 4.08 kg M1*V1 + M2*V2 = M1*V + M2*V 2.55*3.13 + 4.08*0 = 2.55*V + 4.08*V 7.982 = 6.63V V = 1.20 m/s.
January 22, 2015

Math
1b.
January 21, 2015

Physics
X = 64.9 Y = ? Z = 87.6 = magnitude or hypotenuse. X^2 + Y^2 = Z^2 Solve for Y.
January 21, 2015

Physics
2.75*10^19electrons/30s = 9.167*10^17 electrons/s I = (9.167*10^17/62.42*10^17) * 1Amp = 0.147 Amps.
January 21, 2015

physics
Vo = 15.4m/s[34.7o] Xo = 15.4*Cos34.7 = 12.7 m/s. Yo = 15.4*sin34.7 = 8.77 m/s. Y = Yo + g*Tr = 0 @ max.ht. 8.77 - 9.8*Tr = 0 -9.8Tr = -8.77 Tr = 0.895 s. = Rise time. Tf = Tr = 0.895 s. = Fall time. Tr+Tf = 0.895 + 0.895 = 1.79 s. to hit gnd.
January 21, 2015

physics
h = Vo*t + 0.5g*t^2 Vo = 0 t = 2.88 s. g = 9.8 m/s^2 Solve for h.
January 21, 2015

physics
M2V2 = M1V1 0.00255*V2 = 10.7*4.26 Solve for V2.
January 21, 2015

Math proportions
(20min/150people) * 240people = 32 Min.
January 21, 2015

Algebra 2
g(x) = x^2 - 7x - 9 g(-1) = (-1)^2 - 7*(-1) - 9 = -1 F(g(-1)) = F(-1) F(x) = x - 2 F(-1) = -1 - 2 = -3.
January 21, 2015

algebra
m2 = m1 = -A/B = -1/1 = -1 P(0,0), m2 = -1 Y = mx + b = 0 -1*0 + b = 0 b = 0 Y = -1x + 0 Eq2: Y = -x
January 21, 2015

7th grade math
Both answers are correct!
January 21, 2015

Algebra
2(x+3) = 2x+3 2x+6 = 2x+3 2x-2x = 3-6 0 = -3? No
January 21, 2015

algebra
10in./30in. =
January 21, 2015

Math (Greatest common factor)
12 = (1*12), (2*6), (3*4). 18 = (1*18), (2*9), (3*6). 24 = (1*24), (2*12), (3*8), (4*6). CF = 1,2,3,6. GCF = 6. So we factor out 6 and the variables with the lowest exponents: 6m^2n^3(2m^3 + 3m - 4) I, normally, find the GCF by knowing that the GCF =< 12 (the smallest ...
January 21, 2015

Math
1. 6.4in * 2.54cm/in = 2. 4qts * 32oz./qt * 0.03L/oz. = 3. 10kg * 1Lb/0.454kg =
January 21, 2015

Science
B.
January 21, 2015

Science
B.
January 21, 2015

physics
A train whistle is heard at 280Hz as the train approaches town. The train cuts its speed in half as it nears the station, and the sound of the whistle is then 270 Hz. What is the speed of the train before slowing down? What is the speed of the train after slowing down?
January 21, 2015

physics
M1*V1 + M2*V2 = M1*V3 + M2*V3 V3 = V4. 60*0 + 15*12 = 60*V3 + 15*V3 180 = 75V3 V3 = 2.4 m/s = Velocity after impact.
January 21, 2015

physics
a. Y = Yo + g*t = 0 + 9.8*1 = 9.8 m/s = Ver Component. X-component = 0 b. D = 0.5*g*t^2. Solve for D. Y = D, X = 0.
January 21, 2015

physic
a. V = a*t = 0.5m/s^2 * 4s. = 2 m/s. b. d = 0.5a*t^2 = 0.5*0.5*4^2 = 4 m.
January 21, 2015

Physics
T = 12s./10rev = 1.2 s/rev.=1.2 s/cycle
January 20, 2015

Math
sqrt(450) = sqrt(2*225) = 15*sqrt(2).
January 20, 2015

ascience
X = 20 mi/h Y = 10 mi/h Tan A = Y/X = 10/20 = 0.50 A = 26.56o V = X/Cos A = 20/Cos26.56 = 22.4mi/h[26.56o]
January 20, 2015

Physics
Do you mean (5,7)? If so, (x,y) = 5,7).
January 20, 2015

physics
V = Vo + g*t V = 0 Vo = Initial velocity. g = -9.8 m/s^2 t = 2.2 s. Solve for Vo.
January 20, 2015

Math
Yes.
January 20, 2015

math
Bearing of Q = 90-50 = 40o East of North
January 20, 2015

Math
8/25 + 1/5 + x = 4/5 X = 4/5 - 8/25 - 1/5=20/25 - 8/25 - 5/25 = 20/25 - 13/25 = 7/25 of the grid for Nate.
January 19, 2015

physics
Dx = 1710*Cos5.08 =
January 19, 2015

physics
196m[-18o] X = 196*Cos(-18) = Y = 196*sin(-18) =
January 19, 2015

grade 7 math
1. -450 km/h(South). 2. 675 km/h(North). 675T - (-450T) = 3600 km. Solve for T.
January 19, 2015

grade 7 math
A = -80 km/h(West). B = 110 km/h(East). 110T - (-80T) = 760 km 110T + 80T = 760 190T = 760 T = 4 h.
January 19, 2015

grade 7 math
d1 + d2 = 210 km 60*2 + r2*2 = 210 Solve for r2.
January 19, 2015

grade 7 math
9:15 - 8:00 = 1h and 15 min. = 1.25h head-start. d = r1*t = 45km/h * 1.25h = 56.25 km Head-start. r2*t = r1*t + 56.25 t = 9:15AM to 1PM = 3h and 45min = 3.75h r2 * 3.75 = 45*3.75 + 56.25 r2*3.75 = 225 r2 = 60km/h = Michael's speed. r1*t + 56.25 = 45*3.75 + 56.25 = 225 km...
January 19, 2015

grade 7 math
d1 = r1*t1 = 60km/h * 0.5h = 30 km after 0.5 h. r2*t = r1*t + 30 65 * t = 60*t + 30 65t - 60t = 30 5t = 30 t = 6 hours.
January 19, 2015

Physics/Math
a. Eo/Ei = 1.0 100/Ei = 1 Solve for Ei. b. Eo/Ei = 0.30 Eo/100 = 0.30 Solve for Eo. c. Same procedure as a and b.
January 19, 2015

physics
A = 13.2[0o] B = 6.1[110o] R = 13.2+6.1*Cos110 + i6.1*sin110 = 11.11 + 5.73i R^2 = 11.11^2 + 5.73^2 = 156.3 R = 12.50
January 19, 2015

physics
1. D = Vo*t + 0.5a*t^2 = 6.1*6.8 * 0.5*0.49[35o]*6.8^2 = 41.48 + 11.33[35o] = 41.48 + 9.28+6.5.0i = 50.76 + 6.5i D^2 = 50.76^2 + 6.5^2 = 2618.3 D = 51 m. 2. Tan A = Y/X = 6.5/50.76 = 0.12805 A = 7.3o = Direction.
January 18, 2015

physics
M*g = 10kg * 9.8N/kg = 98 N. = Wt. of block. Fn = M*g - Fap*sinA = 98 - 75*sin37 = 52.9 N. Fk = u*Fn = 0.4 * 52.9 = 21.15 N. = Force of kinetic friction. a = (Fap*Cos37-Fk)/M = (75*Cos37-21.15)/10 =
January 18, 2015

Math
Rono: Cost = 4000 + 6*3000 = $22,000 Sam: Cost = 22000 - 5000 =
January 17, 2015

Math
Dan: Cost = 0.90 * 6245 = $5620.50 Dave: Cost = 3000 + 12*500 = $9,000 9000 - 5620.50 =
January 17, 2015

Math
Hali: Cost = 0.95 * 15000 = $14,250 John: Cost = 6000 + 3*3200 = $15,600 15,600 - 14,250 = $1,350 More than Hali.
January 17, 2015

Physics
V = 3km/h[90o] + 40km/h[20o] Y = 3 + 40*sin20 = 16.7km/h = Vertical or Northerly component. d = r*t = 16.7km/h * 6h = 100.1 km.
January 17, 2015

physics
See previous post: Sat,1-17-15, 6:18 PM.
January 17, 2015

physics
Power=Fx * d/t = 70.9*Cos48 * 19.9/4.3 = Note: J/s = Watts.
January 17, 2015

physical science
When they are acting in the same direction. Fmax = 5 + 7 = 12 N.
January 17, 2015

Physics Class
0.450 ms = 0.000450 s. V = Vo + a*t = -36.7 36.7 + a*0.000450 = -36.7 0.00045a = -36.7-36.7 = -73.4 a = -163,111 m/s^2 F = M*a = 0.140 * (-163111) = 22,836 N.
January 16, 2015

Physics
X = 1.84 m/s = Velocity of the current. Y = 1.1 m/s = Velocity of the boat. A. Vb^2 = X^2 + Y^2 = 1.84^2 + 1.1^2 = 4.60 Vb = 2.14 m/s. B. Tan A = Y/X = 1.1/1.84 = 0.59783 A = 30.9o, CCW = 59.1o E. of N. Tan59.1 = d/115 d = 115*Tan59.1 = 192 m. Downstream.
January 16, 2015

Algebra
a. Month 1: Profit = (4.31-1.50)/cup * 1283cups = $3605.23 Profit = (0.83-0.76)/donut * 216Donuts = $15.12 Month 2: Profit = (4.31-1.50)/cup * 4210cups = $11,830.10 Profit = (0.83-0.76)/donut * 317Donuts = $22.19
January 15, 2015

physics
V^2 = Vo^2 + 2g*h V = 0 g = -9.8 m/s^2 h = 6.57 m. Solve for Vo.
January 15, 2015

Math
(32 + 56) 32 = (1,32), (2,16), (4,8). 56 = (1,56), (2,28), (4,14), (7,8). CF = 1,2,4,and 8. GCF = 8. 8(4 + 7)
January 15, 2015

physical science
F(net) = F1 + F2 = 3.5 + (-4.5) = -1 N. = 1 N. Towards the Left.
January 15, 2015

PHYSICS
V^2 = Vo^2 + 2a*d = 0 d = -Vo^2/2a = -(25^2)/-5 = 125 m. Circumference = pi * 2r = 3.14 * 0.54 = 1.70 m. 125m * 1rev/1.70m = 73.5 Revolutions.
January 15, 2015

physics
See Related Questions: Tue, 9-10-13, 1:08 PM.
January 15, 2015

math(5th grade)
2.8pages/3.5min * 31.5min = 25.2 Pages.
January 15, 2015

General/Academics
Glad I could help.
January 14, 2015

General/Academics
0.75*85 + 0.25*F = 89 63.75 + 0.25F = 89 0.25F = 89-63.75 = 25.25 F = 101 = Finals score. Cannot be done! 0.75*85 + 0.25*100 = 88.75% = Max. possible score.
January 14, 2015

physics
Eq1:0.5M*V^2 = 198 J. Eq2: M*V = 13 M = 13/V In Eq1, replace M with 13/V: 0.5*(13/V)*V^2 = 198 6.5*V = 198 V = 30.5 m/s.
January 13, 2015

Physics
Vo = 1860m/s[67.4o] Xo = 1860*Cos67.4 = 714.8 m/s. Yo = 1860*sin67.4 = 1717.2 m/s. Y = Yo-g*Tr = 0 1717.2 - 9.8Tr = 0 9.8Tr = 1717.2 Tr = 175 s. = Rise time. Tf = Tr = 175 s. = Fall time Tr+Tf = 175 + 175 = 350 s. = 5.83 Min. in flight.
January 13, 2015

Math
Social studies: X Hours. 2 3/4 + 1 1/2 + x = 5 3/4 Hours. Solve for X.
January 13, 2015

algebra
-2(2+3)-2k = -2-4(2+2) -2(5)-2k = -2-4(4) -10-2k = -2-16 -10-2k = -18 -2k = -18+10 -2k = -8 Divide both sides by (-2): K = 4. 9(
January 13, 2015

algebra
Y = 16/20 * 38 = 30.4 in. = Length of short side. Cost = 6*Area = 6 * (38*30.4) = 20/16 = 38/30.4 = 1.25
January 13, 2015

math
Your Eq is correct. Length = X Ft. (2/5)x + 600 = 2000. Multiply both sides by 5/2: x + 1500 = 5000 X = 3500 Ft.
January 12, 2015

physics
F = 1500beats/30s = 50 Beats/s = 50cycles/s = 50 Hz. P = 1/F = 1/50 = 0.02 s.
January 12, 2015

Physics
Incomplete.
January 12, 2015

physics
Conservation of Linear Momentum: M1V1 + M2V2 = M1*V3 + M2*V3 M1 = 160,000 kg V1 = 0.30 m/s M2 = 115,000 kg V2 = -0.120 m/s Solve for V3, the final velocity.
January 12, 2015

physics
h = Vy*t + 0.5g*t^2 = 840 m. 0*t + 4.9t^2 = 840 Solve for t.
January 12, 2015

physics
Conservation of Linear Momentum: M1V1 + M2*V2 = M1V3 + M2*V4 77.5V1 + 21*0 = 77.5*2.18 + 21*2.18 77.5V1 + 0 = 214.73 V1 = 2.77 m/s.
January 12, 2015

physics
M1V1+M2V2 = 85*2 + 55*2.7[22o] = 170 + 148.5[22o] = 170 + 148.5*Cos22 + 148.5*sin22 = 170+137.7 + 55.63i = 307.7 + 55.63i = 313[10.25o] kg-m/s.
January 12, 2015

Physics
F = M*g = 0.55kg * 9.8N/kg = 5.39 N. K = 5.39N./0.36m = 14.97 N/m
January 12, 2015

algebra--1 question
Slope = (Y2-Y1)/(X2-X1)=(1+3)/(1+2)=4/3.
January 12, 2015

Physic- help on direction (Not that good at Englis
Use the slope that was calculated from your lab data to calculate g using the given equation.
January 12, 2015

physics
M*g = 89.7kg * 9.8N/kg = 879.1 N. = Wt. of box = Normal force(Fn). Fs = u*Fn = 0.5 * 879.1 = 439.5 N. = Force of static friction. Fap-Fs = M*a Fap-439.5 = M*0 = 0 Fap = 439.5 N. = Force applied.
January 12, 2015

physics
1. Draw a hor. line. 2. Draw a ver. line to the right-end of the hor. line and label it h for height. 3. From the left-end of the hor. line, draw a hypotenuse to the top of the ver. line. The angle it makes with the hor. is 12o. 4. Draw a 2nd hyp. to the right of the first and...
January 12, 2015

physics
E = 43 Volts. R1 = 13 Ohms R2 = 24 Ohms R3 = 41 Ohms I = I1 + I2 + I3 = E/R1 + E/R2 + E/R3 = 43/13 + 43/24 + 43/41 = 3.31 + 1.79 + 1.05 = 6.15 Amps. = Total current drawn from the 43-volt source. P = E*I = 43 * 6.15 = 264.5 Watts = Total power taken from the 43-volt source. P1...
January 12, 2015

Physics-Check
d1 = V1*T = 5m/s * 10min*60s/min=3000 m. d2 = V2*T = 4.5 * 10min*60s/min = 2700 m d1-d2 = 3000 - 2700=300 m. Between them. Or d=(5-4.5)m/s * 10min*60s./min=300 m. Between them.
January 12, 2015

Mechanics
Open circuit.
January 11, 2015

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

Members