Monday
May 25, 2015

Posts by Henry


Total # Posts: 10,621

science
B.
February 18, 2015

physical science
T = 50km * 1h/5km * 60min/h = 600 min.
February 18, 2015

physics
Incomplete.
February 18, 2015

Physical Science
a. h = 0.5g*t^2 h = 20 m g = +9,8 m/s^2 Solve for t. b. V^2 = Vo^2 + 2g*h Vo = 0 g = +9.8 m/s^2 h = 20 m. Solve for V.
February 17, 2015

Physics
Please clarify your problem: Does V mean Voltage or velocity? Did you give all of the INFO? If: V = Supply voltage. V1 = Voltage across R1. V2 = Voltage across R2. R1 and R2 connected in series. Then, V = V1 + V2
February 17, 2015

Physics
I = 7.0 mA V = 14.7 Volts. v1 = 3.5 Volts. V2 = 1.4 Volts. a. V3 = V-V1-V2 b. R3 = V3/I I = 0.007 Amps
February 17, 2015

Physics
See previous post.
February 17, 2015

physical
Vo = 18.7m/s[51o] Xo = 18.7*Cos51 = 11.8 m/s. Yo = 18.7*sin51 = 14.5 m/s. Y^2 = Yo^2 + 2g*h = 0 h = -Yo^2/2g = -14.5^2/-19.6 = 10.8 m. Y^2 = Yo^2 + 2g*d = 0 + 19.6*(10.8-2.5)= 162.68 Y = 12.8 m/s = Ver. component. V^2 = Xo^2 + Y^2 = 11.8^2 + 12.8^2 = 303.08 V = 17.4 m/s. = ...
February 17, 2015

science
a = (V-Vo)/t = Acceleration in Ft./s^2 V = 20 Ft/s. Vo = 5 Ft/s.
February 17, 2015

physics
V = sgrt(X^2+Y^2)
February 17, 2015

physics
V = 5m/s[30o] Vy = 5*sin30 = 2.5 m/s
February 17, 2015

Algebra
Eq1: x + y = -8 Eq2: x - y = 4 Sum: 2x = -4 X = -2 In Eq1, replace x with -2: -2 + y = -8 Y = -6.
February 16, 2015

physics
M*g = 27 * 9.8 = 264.6 N. = Wt. of the lawnmower. Fn = 264.6 + Fap*sin36=264.6 + 0.588Fap Fk = u*Fn = 0.66*(264.6+0.588Fap) = 174.64 + 0.388Fap (Fx-Fk) = M*a (Fap*Cos36-(174.64+0.388Fap) = M*a (0.81Fap-174.64-0.388Fap = M*0 0.42Fap - 174.64 = 0 0.42Fap = 174.64 Fap = 416 N. = ...
February 16, 2015

Physics
W = Mg * d = 2.80*9.8 * (35-10) = 686 J.
February 16, 2015

Physics
a = (V-Vo)/t =(250-0)/12 =
February 16, 2015

Physics
a. T^2 = 4pi^2(L/g)=4*3.14^2(0.76/9.8) = 3.06 T = 1.75 s.
February 15, 2015

physical science
a. h = 0.5g*t^2 = 4.9*4^2 = 78.4 m b. h = 0.5g*t^2 h = 103 m. g = 9.8 m/s^2 Solve for t.
February 15, 2015

Physics
Incomplete.
February 15, 2015

Business math
Ordinary interest assumes a business year of 360 days. Exact interest uses 365 days per year. a. I = Po*r*T = 4400*(0.1025/360)*135 = $169.125 b. 4400 + 169.125 = $4569.13
February 15, 2015

math
d = 120km/h * 2.6667h=Distance traveled. L = d/4 = Liters of fuel used. Cost = $59 * L =
February 15, 2015

science
V^2 = Vo^2 + 2g*h Vo = 0 g = +9.8 m/s^2 h = 50 m. Solve for V.
February 15, 2015

Physics
M*g = 150 N. Fp = 150*sin20 = Force parallel. Fn=150*Cos20 = Normal or perpendicular.
February 15, 2015

Physics
Fx = 280*Cos33o Fy = 280*sin33o
February 15, 2015

Physics
Xo = 8.57 m/s Yo = -2.61 m/s a. X = Xo + a*t = 8.57 + (-0.105)*6.67 = 7.87 m/s Y = Yo + a*t = -2.61 + 0.101*6.67 = -1.94 m/s b. V^2 = X^2 + Y^2 = 7.87^2 + 1.94^2 = 65.7 V = 8.11 m/s.
February 13, 2015

Physics Honors
Y^2 = Yo^2 + 2g*h = 0 Yo^2 - 19.6*23.2 = 0 Yo^2 = 454.72 Yo = 21.3 m/s = Ver. component of initial velocity. Yo = Vo*sin A = 21.3 m/s 48*sin A = 21.3 sin A = 0.44,425 A = 26.4o = Angle at which golf was hit. Vo = 48m/s[26.4o] Xo = 48*Cos26.4 = 43.0 m/s. V = Xo + Yi = 43 + 0i...
February 13, 2015

science
B. 0.29/5 = W/115
February 12, 2015

science
Wt. = (170/10) * 25 =
February 12, 2015

Physics
a. Energy = 0.5*C*V^2 V doubled: Energy = 0.5*C*(2V)^2 = 0.5*C*4V^2 So the energy is increased by a factor of 4. b. Yes.
February 12, 2015

Physics Dynamics
M*g = 70 * 9.8 = 686 N. = Wt. of sled. Fn = Mg-F*sin20 =
February 12, 2015

Physics Dynamics
Range = Vo^2*sin(2A)/g = 38 32^2*sin(2A)/9.8 = 38 104.5*sin(2A) = 38 sin(2A) = 0.36364 2A = 21.3o A = 10.7o
February 12, 2015

Physics Dynamics
Tan A = 35/80 = 0.4375 A = 23.6o a. Tan23.6 = Vc/2 Vc = 2*Tan23.6 = 0.874 m/s = Velocity of the current. b. Direction = 23.6o to the left.
February 12, 2015

Physics
Vo = 21m/s[40o] Xo = 31*Cos40 = 16.1 m/s. Range=Vo^2*sin(2A)/g = 21^2*sin(80)/9.8 = 44.3 m. Range = Xo*T = 44.3 m. 16.1T = 44.3 T = 2.75 s. = Time in air.
February 12, 2015

Physics
V^2 = Vo^2 + 2g*h Vo = 2.18 m/s. g = +9.8 m/s^2 h = 70.8 m. Solve for V.
February 9, 2015

College physics
d = 239mi * 1600m/mi = 382,400 m. = 382.4 km. Work = F*d = 369 * 382.4 = 141,106 kJ.
February 9, 2015

Physics
Wt. = M*g Work = Mg * h Therefore, the person with the most wt. will do the most work if both covered the same distance up. If they did not cover the same distance, you will have to calculate the work done by each to make a comparison. Power is the rate of doing wt. P = Mg * h...
February 9, 2015

math
h = -16x^2 + 64x + 80 = 0 Use Quadratic Formula. X = -1, and 6. Select the positive value: X = 6 s. = Time to reach gnd.
February 9, 2015

maths
a. KE = 0.5*M*V^2 = 130 J. 0.5*11*V^2 = 130 V^2 = 23.64 V = 4.86 m/s. b. V^2 = Vo^2 + 2g*h = 4.86^2 + 19.6*3 = 82.4 V = 9.1 m/s c. V^2 = Vo^2 + 2g*h = 0 + 19.6*15 = 294 V = 17.15 m/s.
February 9, 2015

engineering science n2
V = Vo + g*t V = 0 Vo = 20 m/s. g = -9.8 m/s^2 Solve for t.
February 9, 2015

physics
See previous post: Sun, 2-8-15, 8:14 PM.
February 8, 2015

Physics Dynamics
M*g = 5 * 9.8 = 49 N. = Wt. of box. Fn = 49 - 45*sin40 = 20.1 N. = Normal force. Fk = u*Fn = 0.2 * 20.1 = 4.01 N. = Force of kinetic friction. a = (Fx-Fk)/m = (45*Cos40-4.01)/5 = 6.1 m/s^2
February 8, 2015

physics
d = V*t d = 18.4 m V = 44.8 m/s Solve for t.
February 8, 2015

Physics
Series Connection: When one lamp burns out, all of the lamps go out. So you are in the dark until the lamp is replaced.
February 8, 2015

physics
7grams * 5.66*10^21atoms/gram * 46e/atom = 1.82252*10^24 Electrons. b. 1.82252*10^24e * 1.6*10^-19C/e = 2.916*10^5 C. = Your answer.
February 8, 2015

physics
1/f = 1/di + 1/do LCD = di*do 1/f = do/di*do + di/di*do 1/f = (do+di)/di*do Invert both sides: f = di*do/(do+di)
February 8, 2015

physics
KE = KE1 + KE2 = 0.5*M*V^2 + KE2 = 0.5*0.6*3^2 + 2.5 = 5.2 J. KE = 0.5*0.6*V^2 = 5.2 V^2 = 17.33 V = 4.16 m/s.
February 8, 2015

physics
a = (V-Vo)/t = (9.3-0)/1.39 = 6.69 rad/s^2
February 8, 2015

science
P = F * d/s = Mg * d/t = 5000 * 25/50 = 2500 J./s = 2500 W.
February 8, 2015

physics
a. KE = 0.5*M*V^2 = 0.5*66*4.3^2 = 610.2 J. = Energy lost due to friction. b. M*g = 66 * 9.8 = 646.8 N. = Wt. of runner = Normal(Fn). Fk = u*Fn = 0.6 * 646.8 = 388.1 N. = Force of kinetic friction. KE = Fk*d = 610.2 388.1*d = 610.2 d = 1.57 m.
February 8, 2015

physics
Vo = 111km/h = 111000m/3600s. = 30.8m/s W = KE = 0.5M*Vo^2 =
February 7, 2015

Physics
2.76km[0o] + 0.85km[270o] X = 2.76*Coso + 0.85*cos270 = 2.76 N. Y = 2.76*sin0 + 0.85*sin270 = Fr = sqrt(X^2+Y^2)
February 7, 2015

Physics
24N[60o] + 9N[0o] X = 24*Cos60 + 9*Cos0 = 21 N. Y = 24*sin60 + 9*sin0 = 20.8 N. Fr^2 = 21^2 + 20.9^2 = 873.64 Fr = 29.6 N.
February 7, 2015

Physics
Pellet A: V = Vo + g*Tr Tr = -Vo/g = -27.3/-9.8 = 2.79 s. = Rise time. Tf1 = Tr = 2.79 s. = Time to Fall back to the edge of the cliff. Tf2 = Fall time from edge of cliff to gnd. Ta = Tr + Tf1 + Tf2 = 2.79 + 2.79 + Tf2 = 5.57 + Tf2. = Time in air, pellet A Pellet B: Tb = Tf = ...
February 7, 2015

Physics
Vo = 17.6m/s[29o] Xo = 17.6*Cos29 = 15.4 m/s Yo = 17.6*sin29 = 8.53 m/s Y = Yo + g*Tr = 0 Tr = -Yo/g = -8.53/-9.8 = 0.870 s. = Rise time. Range = Dx = Vo^2*sin(2A)/g = 17.6^2*sin(58)/9.8 = 26.8 m. h = Yo*Tr + 0.5g*Tr^2 = 8.53*0.870 - 4.9*0.870^2 = 3.71 m. = Max. ht. Xo*(Tr+Tf...
February 6, 2015

Physics
Vo = 16.0m/s[51o] Yo = 16*sin51 = 12.43 m/s. = Vertical component of initial velocity. Y = Yo + g*Tr = 0 Tr = -Yo/g = -12.43/-9.81 = 1.27 s. = Rise time. h = Yo*Tr + 0.5g*Tr^2 = 12.43*1.27 - 4.9*1.27^2 = 7.89 m. = Max. ht. h = ho - 0.5g*Tf^2 = 2 m 7.89 - 4.9*Tf^2 = 2 4.9Tf^2...
February 6, 2015

physics
R = E/I = 2.60/0.665 = 3.91 Ohms = Total resistance. Rl = 3.91 - 0.182-0.139 = 3.589 Ohms = Lamp resistance.
February 6, 2015

physics
See Related Questions: Thu, 9-12-13, 6:35 PM.
February 6, 2015

physic
See previous post: Sun, 2-8-15, 7:40 PM.
February 5, 2015

Physics
P = 0.5M*V^2/t = 0.5*65*12^2/3 = 1560 J/s = 1560 Watts
February 5, 2015

PHYSICS
a. d = Vo*t = 60 m 26 * t = 60 t = 2.31 s. = Fall time. h = 0.5g*t^2 = 4.9*2.31^2 = 26.1 m. b. h = Same as part a.
February 5, 2015

physic
A. M1*V1 + M2*V2 = M1*V3 + M2*V4 0.25*0+0.20*2.20=0.25*V3 + 0.20*1.5[37] 0.44 = 0.25V3 + 0.3[37o] 0.44 = 0.25V3 + 0.3*Cos37 + i0.3*sin37 0.44 = 0.25V3 + 0.240 + 0.181i -0.25V3 = 0.240 - 0.44 + 0.181i = -0.25V3 = -0.20 + 0.181i V3 = 0.8 - 0.734i V3 = sqrt(0.8^2+0.734^2) = 1.18 ...
February 5, 2015

physics
h = 0.5g*t^2 = 100-25 4.9*t^2 = 75 t^2 = 15.31 t = 3.91 s. = Fall time. Dx = Xo*t = 20 m. Xo*3.91 = 20 Xo = 5.11 m/s. = Hor. velocity.
February 5, 2015

physical
Fr^2 = F1^2+F2^2
February 5, 2015

physics
See Related Questions: Sun, 10-21-13, 9:10 PM.
February 4, 2015

physics
V-Vo = 6.24/m/s[-54.3o]-5.45m/s[38.5o] X = 6.24*Cos(-54.3) - 5.45*Cos38.5 = -0.624 m/s Y = 6.24*sin(-54.3) - 5.45*sin38.5 = -8.46 m/s ax = -0.624/4.0 = -0.156 m/s^2 ay = -8.46/4.0 = -2.115 m/s^2
February 4, 2015

physics
F = m*a = 7000kg * 9.8N/kg = 68,600 N. W = F*d
February 4, 2015

trig
067degree
February 4, 2015

Math
Ax + By + C = 0
February 4, 2015

physics
R = 650 + 350 + 1000 =
February 4, 2015

math
a. P = 9/(10+9+6) = 9/25. green P = 6/(10+8+6) = 6/24 = 1/4. blue.
February 4, 2015

physics
a. V^2 = Vo^2 + 2a*d V = 0 Vo = 16 m/s d = 10 m. Solve for a. b. V = Vo + a*t V = 0 Vo = 16 m/s. a = Value calculated in part a. Solve for t.
February 3, 2015

physics
X = -3.5 + 0 + 5.5 = 2.0 Y = 4.5 -6.5 -2.5 = -4.5 Tan A = Y/X = -4.5/2 = -2.250 A = -66.0 CW = 294o CCW.
February 3, 2015

algebra
x = -6 x+6 = 0 x = -4 x+4 = 0 Y = (x+6)(x+4) = 0 Y = x^2 + 4x + 6x + 24 = 0 Y = x^2 + 10x + 24 = 0
February 3, 2015

math
See previous post: Tue, 2-3-15, 7:55 PM.
February 3, 2015

business calc
30yrs * 12mo/yr. = 360 Mo. P = 450.23/mo. * 360mo. = 162,082.80 Cost = P-Po = 162,082.80 - 52,000 = 110,082.80
February 3, 2015

Math
Vo = 5*0^2 - 12*0 + 7 = 7 m/s. t = 0. V = 5*2^2 - 12*2 * 7 = 3 m/s. t = 2 s. a = (V-Vo)/t = (3-7)/2 = -2 m/s^2.
February 3, 2015

math
Circumference = pi*Dia. = 3.14 * 27 = 84.823 in = 7.07 Ft. 1 Mile = 5,280 Ft. 5,280Ft. * 6.28rad/7.07Ft. = 4,690 Rad.
February 3, 2015

math
h = ho + ho*0.15*10 = 27 in. ho + 1.5ho = 27 2.5ho = 27 ho = 10.8 In. = Initial ht. h = 10.8 + 10.8*0.15*9 = 25.4 Inches yesterday.
February 3, 2015

Math
Multiply Eq1 by 3 and add: 12x-6y = 21 3x+6y = 9 Sum:15x = 30 X = 2 In Eq2, replace x with 2: 3*2 + 6y = 9 6 + 6y = 9 6y = 9 - 6 = 3 Y = 1/2.
February 3, 2015

Math
P = X + 1.3X P = 2.3X
February 3, 2015

algebra
Correct!
February 3, 2015

Math
The slopes of perpendicular lines are negative reciprocal of each other. a. m1 = (1-4)/(-1-1) = -3/-2 = 3/2 b. m2 = (-1-3)/(-1-3) = -4/-2 = 2 The 2 lines are not perpendicular. Note: If the slope of the 2nd line was -(2/3), the lines would be perpendicular.
February 3, 2015

math
What are the critical values on the graph of y = x^3 - 6x^2 + 9x + 3?
February 3, 2015

physics
0.200 kg block: d = 0.5a*t^2 = 0.44 m. 0.5a*2^2 = 0.44 2a = 0.44 a = 0.22 m/s^2. 0.400 kg block: d = 0.5a*t^2 = 0.5 * 0.22*2^2 = 0.44 m
February 2, 2015

Physics
Jack: V = d/t = 9*25m/160.1s. = Ans. in m/s. Jill: V = d/t = 10*25m/160.1s = Ans. in m/s.
February 2, 2015

physics
W = F*d = 34.5*10^6 * 393*10^3 = Answer in Joules.
February 2, 2015

Physics
V = Vo + g*Tr = 0 7.65 - 9.81*Tr = 0 9.81Tr = 7.65 Tr = 0.780 s. = Rise time. h = ho + Vo*Tr + 0.5g*Tr^2 h = 12.7 + 7.65*0.78 - 4.9*0.78^2 = 15.69 m. Above gnd. a. V^2 = Vo^2 + 2g*h = 0 + 19.6*15.69 = 307.4 V = 17.53 m/s b. h = 0.5g*t^2 = 15.69 4.9t^2 = 15.69 t^2 = 3.20 t = 1....
February 2, 2015

Physics
Vo = 8.50m/s[-23o] Xo = 8.50*Cos(-23) = 7.82 m/s. Yo = 8.50*sin(-23) = -3.32 m/s. = Ver. component of initial velocity.
February 2, 2015

Physics
P = Es*Is = 150,000 Watts 120*Is = 150,000 Is = 1250 Amps. = Current flowing through secondary coils. Ip = 140/25000 * 1250 = 7 Amps = current through primary coils and transmission lines.
February 2, 2015

Physics
M1*V1 + M2*V2 = M1*V3 + M2*V4 0.045*134 + 1.5*0 = 0.045*78 + 1.5*V4 Solve for V4.
February 2, 2015

Physics
Conservation of momentum: Total momentum before the collision = Total momentum after the collision. M1*V1+M2*V2 = M1*V+M2*V = (M1+M2)*V 46*529 + 1000*0 = 1046*V Solve for V.
February 2, 2015

Physics
a = (V-Vo)/t V = 16.7 m/s Vo = 10.3 m/s. M = F/a
February 2, 2015

physics
1. Fx = 20*cos30 = 17.32 N. 2. Work = Fx*d = 0 * 10 = 0 3. a. 4. W = Fx*d = 255*Cos60 * 15 = 5.
February 2, 2015

Physical Science
Scale1 = x Newton. Scale2 = 2x Newton x + 2x = 1200 N. Solve for x.
February 2, 2015

Physics
See Related Questions: Fri, 1-31-14, 10:23 PM.
February 2, 2015

Physics
Vo = 31.1m/s[37o] Xo = 31.1*Cos37 = 24.84 m/s. Yo = 31.1*sin37 = 18.72 m/s. Y = Yo + g*Tr = 0 18.72 - 9.8*Tr = 0 9.8Tr = 18.72 Tr = 1.91 s. = Rise time. Y^2 = Yo^2 + 2g*h = 0 h=-Yo^2/2g = -(18.72)^2/-19.6 = 17.88 m = Max. ht. 0.5g*t^2 = 17.88 - 5.50 4.9t^2 = 12.38 t^2 = 2.53 t...
February 2, 2015

Science
Fs = u*Fn = 0.4 * 20 = 8 N.
February 2, 2015

Physics
M*g = 150 N. g = 1.63 m/s^2 Solve for M(kg).
February 2, 2015

science
h = o.5g*t^2 h = 10 m. g = +9.8 m/s^2 Solve for t.
February 2, 2015

physics
Please disregard my 5:24 PM post.
February 2, 2015

physics
Tr = 1.5 + 1 = 2.5 s. = Rise time or time to reach max ht. V = Vo + g*Tr = 0 Vo -9.8*2.5 = 0 Vo = 24.5 m/s. = Initial velocity. h = Vo*t + 0.5g*t^2 = 24.5*1.5 - 4.9*1.5^2 = 25.7 m. = Ht. of the tower.
February 2, 2015

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