Tuesday
September 16, 2014

Posts by henry


Total # Posts: 9,072

physics
Wb = m*g = 7.6kg * 9.8N/kg = 74.48 N. = Wt. of block. Fs = 8 N ? Fs = us*Fv = 8 N. us*74.48 = 6 us = 0.081
November 17, 2013

geometry
See previous post: Sat, 11-16-13, 7:13 PM.
November 17, 2013

GEOMETRY
1. Triangle #1 a = 8 b = 15 c = 18 Triangle #2: d = 10 e = ? f = ?. a/d = b/e = c/f = 8/10 15/e = 8/10 e = 18.75 18/f = 8/10 f = 22.5 2. Scale Factor=5/4 = 15/12=25/20 = 1.25 3. x/r = y/p = z/n.
November 16, 2013

physics
Fn = m*a m = Fn/a = 50/25 = 2 kg
November 16, 2013

Trig
V1 + V2 = 1200[70o] + 900[205o] X = 1200*cos70 + 900*cos205 = -405.3 Y = 1200*sin70 + 900*sin205 = 747.3 tanAr = Y/X = 747,3/-405.3 = -1.84376 Ar = -61.53o = Reference angle. A = -61.53 + 180 = 118.5o Vr = Y/sinA = 747.3/sin118.5 = 850.3[118.5o] = Resultant vector.
November 15, 2013

nature of science
A. The speed and direction.
November 15, 2013

Math
V1 = 1.5 *1.5 * 0.25 = 0.5625 in^3. V2 = 3.25 * 3.50 * 0.25 = 2.844 in^3. V2/V1 = 2.844/0.5625 = 5.056 = 505.6%. % Increase = 505.6% - 100% = 405.6 %.
November 15, 2013

physics
h = 9.7*sin30 = 4.85 m. V^2 = Vo^2 + 2g*h V^2 = 0 + 19.6*4.85 = 95.06 V = 9.75 m/s.
November 14, 2013

Physics
F1=m*g = 0.151[26.2o]*9.8=1.480N[26.2o] F2 = 0.215[281o]*9.8 = 2.107N[281o] F3[Ao] F = F1 + F2 + F3 F=1.480N[26.2o] + 2.107N[281] + F3[Ao] X = 1.480*cos26.2+2.107*cos281+F3*cosA=0 X = 1.328 + 0.4020 + F3*cosA = 0 F3*cosA = -1.73 cosA = -1.73/F3. Y = 1.480*sin26.2+2.107*sin281+...
November 14, 2013

MATH
P = Po + Po*r*t P = 15,000 + 15,000*0.045*(8/12) Solve for P.
November 14, 2013

Math
6w + 20 = 60 6w = 40 W = 6 4/6 or 7 Weeks.
November 14, 2013

4th grade math
1. a/7 = 20 Multiply both sides by 7: a = 7 * 20 = 140. Check: 140/7 = 20 2. Same procedure as #1. 3. Same procedure as #1.
November 14, 2013

Physics
a. F*cos20-Fk = m*a = m*0 = 0. F*cos20-u(Fn+F*sin20) = 0 300*cos20 - u(1000+300*sin20) = 0 281.9 - 1102.6u = 0 1102.6u = 281.9 u = 0.256 = Coefficient of kinetic friction. b. m*g = 1000N. m = 1000/g = 1000/9.8 = 102 kg. 300*cos20 - 0.256(1000-300*sin20)=m*a 281.9 - 229.7 = m*a...
November 14, 2013

math
Scott ate X Fries Mike ate (2x+1) Fries. Holly ate (x-5) Fries. Total fries ordered = Fries ate + 6: ORDER = X + (2x+1) + (x-5) + 6 = 4x + 2.
November 14, 2013

physics
Tr + Tf = 4.8s. = Rise time + Fall time = Time in air. Tr = Tf = 4.8/2 = 2.4 s. Dx = 60yds * 3Ft/yd * 1m/3.3Ft=54.55 m. Dx = Xo * (Tr+Tf) = 54.55 m. Xo * 4.8 = 54.55 Xo = 11.36 m/s. = Hor. component of initial velocity. Y = Yo + g*Tr = 0 @ max ht. Yo - 9.8*2.4 = 0 Yo = 23.52 m...
November 14, 2013

physics
See your 6:11 PM post.
November 13, 2013

physics
Work = F*d = 1 * 2000 = 2000 Joules. Calories = 2000J * 1cal/4.184J = 478
November 13, 2013

Physics
V = 90km/h = 90000m/3600s = 25 m/s. a = (V-Vo)/t = (25-0)/6 = 4.167 m/s^2 d = 0.5a*t^2 = 0.5*4.167*6^2 = 75 m. P = F*d/t = mg * d/t P = 13720 * 75/6 = 171,500 J/s.
November 13, 2013

Math-Algebra
1. F = m*a = 25 * 3 = 75 N.
November 13, 2013

Fly Ball Lab - Projectile Motion Please HELP FAST!
Dx = Xo * T = 48.9 m. Xo * 3.60 = 48.9 Xo = 13.58 m/s = Hor. component of initial velocity. Tr = Tf = T/2 = 3.60/2 = 1.80 s. = Rise and fall times. Y = Yo + g*Tr = 0 @ hmax. Yo - 9.8*1.8 = 0 Yo = 17.64 m/s = Ver. component of initial velocity. tan A = Yo/Xo = 17.64/13.58 = 1....
November 12, 2013

math
0.25 - (-1.5) = 0.25 + 1.5 = 1.75
November 12, 2013

math
1 1/2 - 2 = 3/2 - 4/2 = -1/2.
November 12, 2013

Physics
1. F = 250*2 + 25 = 525 N. Work = F*d = 525 * 2 = 1050 Joules. 2. P = F*d/t = 525 * 2/3 = 350 J/s. = 350 Watts.
November 12, 2013

Physics
Wt = m*g = 24kg * 10N/kg = 240 N.
November 12, 2013

MATH
A. P1 = Po*r*t/(1-(1+r)^-t) Po = $225,000 r = (5%/12)/100% = 0.004167 = Monthly % rate expressed as a decimal. t = 12mo/yr * 30yrs = 360 Months. Plug the above values in the given Eq and get: P1 = $434,810.88 I = P1-Po B. P2 = (Po*r*t)/(1-(1+r)^-t) Use same procedure as A.
November 12, 2013

physics
a=(V^2-Vo^2)/2d=(0-90^2)/1.2m=-6750m/s^2 F = m*a = 0.04 * -6750 = -270 N.
November 12, 2013

math
a = (V-Vo)/t = (0-35)/0.02 = -1750 m/s^2 F = m*a = 0.15 * -1750 = -262.5 N.
November 11, 2013

Math
611/14 = 43.64 Estimate = 600/15 = 40. 76 + 8 = 84 Estimate = 75 + 10 = 85 Estimates can be done without the calculator when the proper numbers are chosen.
November 11, 2013

Math
x = 3y - 6 = 0 3y - 6 = 0 3y = 6 Y = 2 = y-int.
November 11, 2013

Math
2/1 < 2x/5 < 3/1 Multiply the inequality by 5: 10 < 2x < 15 Divide by 2: 5 < X < 7 1/2 Solution: X = 6, and X = 7.
November 11, 2013

Math
2y = x - 8 Replace x with 0 and solve for y: 2y = 0 - 8 Y = -4 = y-int. Eq: Y = -2x - 4
November 11, 2013

algebra
5.7*10^4.
November 11, 2013

algebra
db=10*Log(2.42*10^5)=10*Log(242000) = 54
November 11, 2013

physics
Fr = 283N.[41o] + 283N.[0o] X = 283*cos41 + 283 = 496.6 N. Y = 283*sin41 = 185.7 N. Fr^2 = X^2 + Y^2 Fr^2 = 496.6^2+185.7^2 = 281,096.05 Fr = 530.2 N. Ff = u*mg = 0.283 * 264.6 = 74.9 N. a = (Fr-Ff)/m=(530.2-74.9)/27=16.9 m/s^2
November 10, 2013

physics
Wb = m*g = 29kg * 9.8N/kg = 284.2 N. = Wt. of the block. 1. Fp = 284.2*sin A = Force parallel to the incline. Fn = 284.2*cos A = Normal or Force perpendicular to the incline. Fs = us*Fn = 0.7*284.2*cos A=199*cos A Fp-Fs = m*a = m*0 = 0 284.2*sinA - 199*c0sA = 0 284.2sinA = ...
November 10, 2013

Physics
h = 0.5g*t^2 = 2.4 m. 4.9t^2 = 2.4 t^2 = 0.490 Tf = 0.7 s. Dx = Xo * Tf = 4.8m/s * 0.7s = 3.36 m from the table.
November 10, 2013

Physics
d = 0.5g*t^2 = 24.6 m. 0.5g*3.4^2 = 24.6 Solve for g.
November 9, 2013

physics
Dr = 12km[30o] + 8km[90o] + 4km[165o] X = 12*cos30+8*cos90+4*cos165 = 6.53 km Y = 12*sin30+8*sin90+4*sin165 = 15.0 km tan A = Y/X = 15/6.53 = 2.29709 A = 66.5o Dr = Y/sin A = 15.0/sin66.5 = 16.4 km[66.5o].
November 9, 2013

Math
See your previous post, Tyrone.
November 9, 2013

MATH MATH MATH
See your previous post, Tyrone.
November 9, 2013

math
See your previous post.
November 9, 2013

Math
See your previous post.
November 9, 2013

MATH
See your previous post.
November 9, 2013

MATH
Correction: P = (Po*r*t)/(1-(1+r)^-t).
November 9, 2013

MATH
Loan amt. = 0.8 * 195,000 = $156,000 P = Po*r*t/(1-(1-(1+r)^-t) r = (6%/12)/100% = 0.005 = Monthly % rate expressed asva decimal. t = 30yrs * 12mo/yr = 360 Months. P1 = (156000*0.005*360)/(1-1.005^-360) = $336,707.57 I = P-Po = P2 = (195000*0.005*360)/(1-1.005^-360) = $420,884...
November 9, 2013

Physics 11
(1/6) * 9.8m/s^2
November 8, 2013

Physics
Xo = 6 m/s. Yo = 3.5 m/s. a. tanA = Yo/Xo = 3.5/6 = 0.58333 A = 30.3o Vo=Xo/cosA = 6/cos30.3 = 6.95m/s[30.3o] b. X = Xo = 6 m/s. It does not change. c. Y = Yo + g*t Y = 3.5 - 9.8*0.5 = -1.4 m/s. The negative sign means the ball is falling. d. h=(Y^2-Yo^2)/2g=(0-3.5^2)/-19.6 = ...
November 7, 2013

physics
F = 10*4^2 + 100 = 260 N. Wc = m*g = 25 * 9.8 = 245 N. = Wt. of crate. Fk = uk*mg = 0.25 * 245 = 61.25 N. = Force of kinetic friction. a = Fn/m = (F-Fk)/m = (260-61.25)/25 = 7.95 m/s^2. V = a * t = 7.95 * 4 = 31.8 m/s.
November 7, 2013

Physics
a. C = pi*2r = 3.14 * 3 = 9.42 m. V = (20/9.42) * 2pi = 4.25pi rad/s = 13.34 rad/s.
November 7, 2013

Physics
V = a*t = 1.7 * 0.7 = 1.19 m/s.
November 7, 2013

physics
Vo = 5.8m/s[17o] Xo = 5.8*cos17 = 5.55 m/s. Yo = 5.8*sin17 = 1.70 m/s. Y = Yo + g*t = 0 @ max. ht. Tr = (Y-Yo)/g = (0-1.70)/-9.8 = 0.173 s. = Rise time. h=(Y^2-Yo^2)/2g = (0-1.7^2)/-19.6=0.147 m. h = 1.4 + 0.147 = 1.55 m Above shorter bldg. h = 0.5g*t^2 = 1.55 m. 4.9*t^2 = 1....
November 7, 2013

Physics
Fap - 0.6*34 = m*a = m*0 = 0 Fap = 20.4N,mln. = Force applied. 27,2 N will move the block. m*g = 34 m*9.8 = 34 m = 3.47 kg a=Fn/m = (27.2-0.472*34)/3.47=3.21 m/s^2
November 7, 2013

science
11 - L = (150/100)*(9-L) 11-L = 13.5 - 1.5L 0.5x = 2.5 L = 5 cm
November 7, 2013

MATHS
Mass = 2*(200+(3/5)*200) = 640 Grams.
November 7, 2013

physics
d = V * t = 343m/s * 0.5s = 171.5 m.
November 6, 2013

maths
X = # short sticks. 2X = # Long sticks. x + 2x = 45 X = 15 Short sticks. 2X = 30 Long sticks. Therefore, you can make 15 triangles using 15 short sticks and 30 Long sticks. If the answer was 11 triangles: 11triangles * 3sticks/triangle = 33 sticks.
November 6, 2013

physics
Va=23rev/2.8min * 2pirad/rev * 1min/60s= 0.274 rad/s.
November 5, 2013

physics
C = pi * D = 3.14 * 100 = 314 m. = The Circumference. d = 14m/s * 240s = 3360 m Da = (3360/314) * 2pi Rad. = 21.4pi Rad.
November 5, 2013

Physics
V=60mi/h * 1600m/mi*1h/3600s.=26.67m/s d2 = d1 + 20 m Vo*t + 0.5a*t^2 = V1*t + 20 26.67*2 + 0.5a*2^2 = 26.67*2 + 20 53.33 + 2a = 73.33 2a = 20 a = 10 m/s^2.
November 5, 2013

physics
h = Vo*t + 0.5g*t^2 = 1000 m. 10t + 4.9t^2 - 1000 = 0 Use Quadratic Formula and get: t = 13.3 s.
November 5, 2013

Physics
Dx = Xo * Tf = 35 m. 22.2 * Tf = 35 Tf = 1.577 s. = Fall time. h = 0.5g*Tf^2
November 4, 2013

Math
d1 = 23.5mi/h * 2h = 47 Mi[180o-32.1o] = 47Mi[147.9o] d2 = 23.5mi/h * 1h = 23.5mi[180-53.6] = 23.5mi[126.4o] d1 + d2 = 47mi[147.9] + 23.5mi[126.4o] X = 47*cos147.9 + 23.5*cos126.4=-53.8 mi Y = 47*sin147.9 + 23.5*sin126.4=43.9 mi D^2=X^2 + Y^2=-53.8^2 + 43.9^2=4821.65 D = 69.4 ...
November 4, 2013

Math
Y = (-1/2)x + 2.
November 4, 2013

college Algebra
Ln y = -0.35 Exponential form: e^(-0.35) = Y Y = 0.7047
November 4, 2013

college Algebra
post
November 4, 2013

college Algebra
Ln y = Log 9 = 0.95424 Exponential form: e^(0.95424) = y Y = 2.5967
November 4, 2013

Math
X = # of children's tickets sold. Y = # of adult tickets sold. 30x + 40y = 930 Replace Y with 0: 30x + 40*0 = 930 X = 31 = X-Int. Replace X with 0: 30*0 + 40y = 930 Y = 23.25 = Y-Int.
November 4, 2013

physics
KE + PE = 480 Joules 220 + PE = 480 PE = PE = 260 J. mg*h = 260 34*9.8*h = 260 333.2h = 260 h = 0.780 m.
November 4, 2013

Physics
Correction: See your 10:57 PM post.
November 3, 2013

Physics
See your 11:57 PM post.
November 3, 2013

Physics
See your 11:57 PM post.
November 3, 2013

Physics
See your 10:57 PM post.
November 3, 2013

Physics
V = Vo + g*t = 0 at max. h. 4.6 - 9.8t = 0
November 3, 2013

Physics
X + Y = 365 X - Y = -123 Sum: 2x = 233 X = 116.5 N. X + Y = 365 116.5 + Y = 365 Y = 248.5 N.
November 3, 2013

5TH GRADE Math
1. 1 = 1*1. 4 = 1*2*2 8 = 1*2*2*2. 32 = 1*2*2*2*2*2. The common factor is 1. 2. 1 = 1*1 3 = 1*3. 6 = 1*2*3. 12 = 1*2*2*3 24 = 1*2*2*2*3. The common factor is 1. the commonfactors are 1,and 3.
November 3, 2013

Physics
V^2 = Vo^2 + 2g*h V^2 = 0 + 19.6*(53-14) = 764.4 V = 27.65 m/s at 14 m above gnd. h = Vo*t + 0.5g*t^2 = 14-2 = 12 27.65t + 0.5g*t^2 = 12 4.9t^2 + 27.65t - 12 = 0 Use Quadratic Formula and get: t = 0.405 s. To get out of the way.
November 3, 2013

science
V1=60mi/h * 1600m/ml * 1h/3600s=26.7m/s Vo = (50/60) * 26.7m/s = 22.22 m/s. a = (V1-0)/t = (26.7-0)/8 = 3.33 m/s^2 V = Vo + a*t = 22.22 + 3.33*5=38.87 m/s = Final speed.
November 3, 2013

Finance
B. Tuition and dorm fees.
November 3, 2013

science
Wt. = V * Dw Wt. = 450cm^3 * 1g/cm^3 = 450 g = Max. wt. without sinking. 14.5 + X = 450 Grams. X = 435.5 grams can be added. 435.5/2.5 = 174.2 or 174 Pennies.
November 3, 2013

Physics
Vr = (11m/s)/cos(90-55) = 13.4 m/s.
November 3, 2013

electronics
True.
November 3, 2013

pen state university
d = 0.5a*t^2 = 42 rad. 0.5*0.025*t^2 = 42
November 3, 2013

Physics
See previous post.
November 3, 2013

Physics
W = F * d = 9.55*10^-3 * 8.6*10^-2= 82.13*10^-5 = 8.21*10^-4 Joules.
November 3, 2013

Physics
Fg = m*g = 20kg * 9.8N/kg = 196 N. Fp = 196*sin40 = 126 N. = Force parallel to incline. Fn = 196*cos40 = 150 N. = Normal. h = L*sin40 = 6.5*sin40 = 4.18 m. Wg = Fg * h = 196 * 4.18 = 819.3 Joules. Wn = = Fn * h = 150 * 4.18 = 628 N. Fp-Ff = m*a = m*0 = 0 126-Ff = 0 Ff = 126 N...
November 2, 2013

Physics
a. Fr^2 = 119.7^2 + 49.9^2 = 16,818.1 Fr = 129.7 N. b. tanA = Y/X = 49.9/119.7 = 0.41688 A = 22.63o = Direction.
November 2, 2013

Physics
a. V = a*t = 8 m/s a*5 = 8 a = 1.6 m/s^2. b. d = 0.5a*t^2
November 2, 2013

Physics
V = a * t = 1.5[60] * 15 = 22.5m/s[60o. X = 22.5*cos60 = 11.25 m/s = Easterly component. Y = 22.5*sin60 = 19.49 m/s = Northerly component.
November 2, 2013

Physics
a. h = 0,5g*t^2 = 4.9*2.5^2 = 30.6 m. b. d = V * t = 50 m. V*2.5 = 50 V = 20 m/s.
November 2, 2013

physics
Increase in L = a*(T-To)L = 10cm = 0.1m 11.8*10^-6/oC(T-0)1000 = 0.1 0.0118T = 0.1 T = 8.47o C
November 1, 2013

Physics
See previous post.
November 1, 2013

Physics
See previous post: Fri,11-1-13,9:21 AM.
November 1, 2013

Physics
Vo = 22m/s[55o] Xo = 22*cos55 = 12.62 m/s. Yo = 22*sin55 = 18.02 m/s. h = Yo*t + 0.5g*t^2 h = 18.02*2 - 4.9*2^2 Y = = Yo + g*t 18.02 - 9.8*2 = -1.58 m/s. = Vertical component of velocity. The negative sign means the rock is falling.
November 1, 2013

Physics problem
See previous post: Fri,11-1-13,1:00 AM.
November 1, 2013

Physics problem
A.h = Vo*t + 0.5g*t^2 = 80 0 + 4.9t^2 = 80 B. V^2 = Vo^2 + 2g*h V^2 = 0 + 19.6*80 = 1568 V = 39.6 m/s. C.
November 1, 2013

science
V = Vo + a*t. a = Fn/m = 4.8*10^5/4.8 = 1*10^5 m/s^2. t=(V-Vo)/a = (3900-0)/1*10^5 = 0.039 s.
November 1, 2013

algebra solving log equations
Ln sqrt(x-8) = 5 Exponential form: e^5 = sqrt(x-8) Square both sides: e^10 = x-8 X = 8 + e^10 exponential form:
October 30, 2013

geometry
C(-3,-1), P(-3,2). r = 2 - (-1) = 3.
October 30, 2013

alGEBRA 2 help please would appreciate
CORRECTION: F(X1,0), V(0,0), D(X2,0).
October 30, 2013

alGEBRA 2 help please would appreciate
-4x-8y^2 = 0 -4x = 8y^2 X = -2y^2 This is an X-parabola; it opens to the left because "a" is negative. K = -b/2a = 0/-4 = 0 h = 0^2 = 0 V(h,K) = V(0,0). D(X1,0), V(0,0), F(X2,0). X1 = h - |1/4a| = 0 - 1/8 = -1/8. X2 = h + |1/4a| = 0 + 1/8 = 1/8. Use the following ...
October 30, 2013

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