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March 27, 2017

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Posts by Scott

Total # Posts: 1,998

physics
1/2 m v^2 = m g h v = √(2 * 9.8 * 1.2)
October 24, 2016

Math
looking at a polar cross section Monica's radius of rotation (r) is ... 3960 mi * sin(90 - 13) her speed is ... 2 * π * r / 24 hr
October 24, 2016

Math
one half of TWO fifths is ONE fifth 1/5 * 60 =
October 24, 2016

algbebra
cd = 1 / (5 - 2) = 1/3 t = f + 6 cd t = 2f + 3 = f + 2 ... 4th = -1 ... 1st = -1 - (3 * 1/3) = -2 ... 25th = -2 + (24 / 3) = 6 s = (-2 + 6) * (25/2)
October 24, 2016

algebra
f(x) = -1 (3x + 8)^2 the graph is tangent to the x-axis ... at (-8/3,0)
October 24, 2016

physics
v^2 = .20 m * 9.8 m/s^2 this is the tangential velocity (v) divide by the radius to find angular
October 23, 2016

Physics
two forces on the ball ... tension and gravity gravity equals the vertical component of tension centripetal force is the horizontal component m v^2 / [1.75 sin(78.0º)] = ... m g tan(78.0º)
October 23, 2016

Pure Math
(x + yi)^2 = x^2 + 2xyi - y^2 x^2 - y^2 = -5 x y = 6 i would suggest a graphical solution ... try fooplot u = 2 + 3i
October 23, 2016

physics
d = 1/2 * a * t^2
October 23, 2016

Maths GRE
TOTAL price ... 3200 + 1800 % options ... 1800 / (3200 + 1800) * 100%
October 23, 2016

Algebra
because of the absolute value ... 2x-8 = 18 ... AND ... 2x-8 = -18
October 23, 2016

Phyics
the centripetal force is ... 42/56 g v^2 / 250 m = 42/56 * 9.8 m/s^2 this is the tangential velocity if you want rpm, multiply by 60 (sec to min); and divide by the station circumference
October 23, 2016

math
d = 1/2 a t^2 = 1/2 * 2.14 * 1.79^2
October 23, 2016

physics
the mass is not a factor (8.5 * r)^2 / r = .89 g r = .89 g / (8.5^2)
October 23, 2016

Physics
momentum is conserved in both the x and y directions the initial momentum is all in the x direction -- the moving ball PMy = 3.0 m/s * sin(60º) * 1.2 kg BVy = PMy / 7.2 PMx = 3.0 m/s * cos(60º) * 1.2 kg BVx = 3.5 - (PMx / 7.2) use Pythagoras to find BV
October 22, 2016

Physics
M1V1 = M2V2 ... M1^2 V1^2 = M2^2 V2^2 5 M1 V1^2 = 4 M2 V2^2 5 M1^2 V1^2 / M1 = 4 M2^2 V2^2 / M2 5 / M1 = 4 / M2 M2 / M1 = 4 / 5
October 21, 2016

Precalc
Ac = c^2 / 4 π triangle perimeter = Pt = 100 - c At = [Pt / (2 + √2)]^2 / 2 ... = (Pt)^2 / (12 + 8√2) ... = (1E4 - 200 c + c^2) / (12 + 8√2) A = (c^2 / 4π) + ... [(1E4 - 200 c + c^2) / (12 + 8√2)] the minimum A lies on the axis of symmetry...
October 21, 2016

algebra
x y = 6 * 3 = 18 2 y = 18
October 21, 2016

math
divide 2nd by -2 ... x = 103 + 5y subtract 5y ... x - 5y = 103 they are the same line
October 21, 2016

science
the speed of sound in air is ... 375 yd/s (approx) the speed of light is relatively instantaneous 3 * 375 = ?
October 21, 2016

physics
a) 15.9 / g = 15.9 m/s / 9.8 m/s^2 c) time up equals time down ... twice a) e) time from c) times 18.0 m/s
October 21, 2016

Math
the one with the exponent between the two
October 21, 2016

Math
let a = 22 / kg, and b = 12 / kg a + b = 20 kg 22a + 12b = 15 * 20 12a + 12b = 240 10a = 60
October 21, 2016

math
b / 12 = 75 / b b^2 = 900
October 20, 2016

chemistry
the two reactants react in equal amounts to give two products in equal amounts let x = concentration of each product Kc = 0.85 = [x]^2 / [1.00 - x]^2 .85 - 1.7 x + .85 x^2 = x^2 .15 x^2 + 1.7 x - .85 = 0 use quadratic formula to find x moles = concentration * vessel size
October 20, 2016

Precal
10^-2 = 3x + 5 -4.99 = 3x
October 20, 2016

algebra
200 (1 + .20)^3
October 20, 2016

physics
the weight is not a factor 1/2 m v^2 = m g h v = √(7 g)
October 20, 2016

Algebra
3.3E10 = 4.069E6 (1 +.026)^y log(3.3E4 / 4.069) = y log(1.026)
October 20, 2016

Science
the volume of water is ... π * 12^2 * 3 m^3 a cubic meter (m^3) of water has a mass of 1000 kg (a metric ton) the weight is the mass multiplied by the gravitational acceleration ... g = 9.8 m/s^2 the weight is in Newtons -- a unit of force
October 19, 2016

physics
s.h. = 4186 4186 * 2 * 75 = 627900 rounding or sig fig?
October 19, 2016

algebra
3^3 * (a^2)^3 = 27 a^6
October 19, 2016

physics
momentum is conserved the speed is zero
October 19, 2016

physics
the mass is not a factor horizontal speed = Sh = S cos(54.5) the flight time to the basket is ... 10.4 m / Sh = 10.4 * cos(54.5) / S vertical speed = Sv = S sin(54.5) gravity slows the vertical speed to zero at the peak, halfway through the flight Sv / g = 1/2 * 10.4 / Sh S...
October 19, 2016

math
(1.05^7 - 1) * 100%
October 19, 2016

math
a. 4000 = A [1+(.104 / 365)^(11 * 365) b. 4000 = A e^(.104 * 11)
October 19, 2016

physics
a) after 1 s the vertical velocity is 2 m/s ... so the average velocity is 7 m/s for the 1st sec b) similar to a) ... the object reaches its peak after 1.2 s ... the average velocity is 6 m/s c) time up equals time down ... 1.2 + 1.2
October 19, 2016

physics
time up equals time down h = 1/2 g t^2 = 4.9 m/s^2 * (2 s)^2
October 19, 2016

physics
60 = 1/2 k x^2 x = √(120 / 460)
October 18, 2016

physics
1/2 k x^2 = 1/2 m v^2 k = m v^2 / 4.5^2 convert 60 km/hr to m/s and calculate
October 18, 2016

Arithmetic progression
10 is not correct ... the 10th term is 23 the difference between terms is 2 27 is (5 + 22) ... the 1st term plus 11 differences ... 27 is the 12th term
October 18, 2016

math
57 (60 - 3) are M, E, or ME ... E + M + ME = 57 ... E + M = 48 M + ME = 2 (E + ME) ... M + 9 = 2E + 18 ... M = 2E + 9 substituting ... E + 2E + 9 = 48 ... E = 13 (i) M + ME (ii) E + ME (iii) M (iv) E
October 18, 2016

Physics
he has a constant velocity (zero acceleration) so the net force on him is zero the frictional force must equal his weight
October 18, 2016

algebra
(4y + 1i)(4y - 1i)
October 18, 2016

Physics
if his last turn is to the south he will be 70 m S and 12 m W of his starting position use Pythagoras to find the displacement
October 18, 2016

GENERAL PHYSICS
100 * 2π / 60 / 2 sec
October 18, 2016

math
36 / 47 = x / 120
October 18, 2016

Chemistry
mole = 6.02E23 particles 5.43E24 / 6.02E23
October 18, 2016

math help
1/2 * b * h = 10 b = h + 1 substituting ... h^2 + h - 20 = 0 (h + 5)(h - 4) = 0 h - 4 = 0
October 18, 2016

Physics
A) 2 * 7 * 10 N to the left B) 2 * 1/2 * 10 * 7^2 J C) the PE from B is converted to KE ... v = √[2 * B / m]
October 18, 2016

math
a = 2 pt, b = 4 pt, c = 5 pt a + b + c = 28 2a + 4b + 5c = 100 a = 2c 2a + 2b + 2c = 56 ... substituting ... 3a + 2b = 56 4a + 8b + 10c = 200 ... substituting ... 9a + 8b = 200 subtract the equations (after multiplying) to eliminate b
October 18, 2016

Physics
a faster stop (because concrete is hard) means a greater impulse
October 18, 2016

physics
the ball's speed is being converted to gravitational potential energy 1/2 m 6.4^2 = ... m g (2.2 - 1.5) + 1/2 m v^2 6.4^2 = 1.4 g + v^2
October 17, 2016

Math
s + b + w = 42 s = 4b 3s + 2b + 1.5w = 102 substituting ... 5b + w = 42 ... 14b + 1.5w = 102
October 16, 2016

Math
2 ft^3 = 2 * 12 * 12 * 12 in^3 24 * 144 / 231
October 16, 2016

phy 101
momentum is conserved so they "trade" velocities
October 16, 2016

Math
64, 32, 16, 8, 4, 2, 1, 1/2
October 16, 2016

Physics
a. weight = mass * g b. normal force equals weight ... but in opposite direction c. Newton's 2nd law ... f = m a ... in this case ... a = f / m d. correct
October 16, 2016

Chemistry
molar mass of acetone ... 58.08 g moles of acetone ... 1.920 / 58.08 molar enthalpy is energy per mole
October 15, 2016

Physical science
(A) m g h = 15 m g (B) m g h = 1/2 m v^2 ... v = √(2 g h) = √(30 g)
October 15, 2016

Math
it takes 12 min (the LCM of the numbers) divide by their rates to find the number of laps
October 15, 2016

Math 1105
yes
October 14, 2016

Physics
there is no force in the horizontal direction (gravity is vertical), so the horizontal velocity remains constant
October 14, 2016

math
the longest side must be less than the sum of the two shorter side the difference between the longest and shortest sides must be less than the middle side L + A = 11 L < (A + 4) ... L < (11 - L + 4) ... 2 L < 15 ... L < 7.5 L = 7, A = 4
October 14, 2016

Physics
A) 18 m/s * 6 s B) 1/2 g t^2
October 14, 2016

Math
1:12::8:x
October 13, 2016

chem
(a) 0.5 * (20.00 / 25.0) * (250.0 / 25.0) (b) multiply the answer from (a) by the molar mass of HCl
October 13, 2016

algebra
a + b = 273 / 3 mph = 91 mph a - b = 7 mph adding equations (eliminating b) ... 2 a = 98 mph
October 12, 2016

Physics
the horizontal velocity is ... 31 m/s * cos(60º) the vertical velocity is ... 31 m/s * sin(60º) + ... 3.4 s * -9.8 m/s^2 add the two component vectors ... a^2 + b^2 = c^2
October 12, 2016

problem solving
s = m - 8 m - 6 = 3(s - 6) = 3 s - 18 m - 8 = 3 s - 20 susbstituting ... s = 3 s - 20 ... 20 = 2 s
October 12, 2016

Physics
height = 1/2 g t^2 + Vo t + Ho 0 = -4.90 * .750^2 + Vo * .750 + 4.80
October 12, 2016

Physics
the difference in total energy (kinetic plus potential) at the base and the top; is the energy input from the engine the ascent time is the average speed, (top + bottom) / 2; divided by the 4.40 km distance energy / time equals power your answer has 5 sig figs. but all the ...
October 12, 2016

Physics
energy = m g h = 73.0 * 9.81 * 420 time = 60 * 15 + 10 power = energy / time
October 12, 2016

physics
his weight plus the centripetal force must equal 1170 N 83.0 [g + (v^2 / r)] = 1170 v^2 / 18.0 = (1170 / 83.0) - 9.81
October 10, 2016

physics
pulling at an angle reduces the frictional force (by reducing the normal force) so the frictional force is ... .42 * {(85 * g) - [F sin(38º)]} the block is in equilibrium when the frictional force equals the horizontal component of the pulling force ... F cos(38º) ...
October 10, 2016

Math
(n / 3) - 7 = 0 n / 3 = 7 n = 7 * 3
October 10, 2016

College Algebra
y = a b^x 8 = a b^0 ... a = 8 2.4 = 8 b^1 ... .3 = b y = 8 * .3^x
October 10, 2016

MATH
division by zero is a no-no ... even 0/0 so the 2nd and 4th are undefined
October 10, 2016

Algebra
Q = 5 * 2^(S + 4)
October 10, 2016

College Algebra
5 * 1.083^13
October 10, 2016

physics again
the water velocity increase is due to the change in gravitational potential energy 1/2 m 3.00^2 - 1/2 m 2.07^2 = m g h 3.00^2 - 2.07^2 = 2 g h the kinetic energy of the jump is converted to gravitational potential energy 6.26^2 = 2 g h the max waterfall is the sum of the two ...
October 9, 2016

physics
the average speed over the interval is (3.00 m/s + 5.60 m/s) / 2 = 4.30 m/s 2/3 of its length is 1.00 m so the time of the interval is ... 1.00 m / 4.30 m/s the change in speed is ... 5.30 m/s - 3.00 m/s acceleration is ... speed change / time
October 9, 2016

Physics
dx = (14 t - 32) dt x = 7 t^2 - 32 t + c 25 = 7 (3^2) - 32 (3) + c 25 = 63 - 96 + c ... 58 = c x = 7 t^2 - 32 t + 58
October 9, 2016

physics
gravity is the centripetal force keeping the satellite in orbit g = m a = 76 kg * .63 m/s^2
October 9, 2016

physics (super hard)
the centripetal force at the top of the circle equals gravity v^2 / r = g v = √(g r)
October 9, 2016

math
a. v = 1/3 * pi * r^2 * h b. the base radius is 4 and the height is 3, so the slant height is 5 (3-4-5 triangle) the 5 is the radius of the circle of which the area of the cone is a segment ... the area of the circle is...25 pi the area of the cone is...4/5 * 25 pi
October 9, 2016

math
7 is the most likely outcome using distinguishable dice, there are 36 possible outcomes ... each of the six faces on a die can pair with the six faces on the other die ... 6 * 6 = 36 twelve of those outcomes result in a sum of 7 ... one third of the rolls
October 9, 2016

Physics
k = f / e k1 e1 = k2 e2 e2 / e1 = k1 / k2
October 9, 2016

chemistry
call the 2nd gas B 3 g of B is half as many moles as 2 g of A B / A = 3 / 1
October 9, 2016

Jar Marbles
a) one of the five red marbles has the number 3 on it, so the probability is 1/5 b) two marbles have the number 1 on them, one red and one blue ... so the probability is 1/2
October 9, 2016

Maths
u = 2t - 6 10u + t = 10t + u + 9 substituting ... 20t - 60 + t = 10t + 2t - 6 + 9 solve for t, then substitute back to find u
October 8, 2016

physics
gravitational force follows an inverse-square relationship inverse of 1/8 is 8 ... 8 squared is 64
October 8, 2016

math
The Holy Father sent a courier from Rome to Venice, commanding him that he should reach Venice in 7 days. The most illustrious Signoria of Venice also sent another courier to Rome, who should reach Rome in 9 days. And from Rome to Venice is 250 miles. It happened that by the ...
October 7, 2016

Physics
the average velocity during braking ... (13.1 + 0) / 2 divide the stopping distance by the average velocity to find the time
October 4, 2016

Math
take out a common factor
October 4, 2016

Algebra
common factor 5x (x + 2)
October 4, 2016

Chemistry
the reaction equation is written in MOLES 2 moles NO plus 1 mole O2 yields ... 2 moles NO2 so 5 moles of O2 uses 10 moles of NO find the molar (formula) weight of NO, and multiply by 10
October 4, 2016

Physics
the delay time is down and back ... twice the depth
October 4, 2016

Physics
yes
October 4, 2016

Physics
how about 4 by 2.9 ...
October 4, 2016

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