Saturday
December 3, 2016

Posts by Scott

Total # Posts: 1,552

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

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

Physics
time = √(2 * distance / acceleration) initial velocity = 2 (distance / time)
October 4, 2016

Chemistry
there are about 55.3 moles of water in a liter the mean (average) concentration of chloride ions will be twice the arithmetic average of the MgCl2 concentrations (two Cl- for each MgCl2) I would be tempted to disregard the 175 value as a "flier"...but that's up ...
October 4, 2016

Science Check my work PLS
#8 ... a range of 5 in the 3rd digit is fairly precise the accuracy is substantially flawed
October 4, 2016

Science
a = f / m = 3 / 1
October 4, 2016

physics
the period is related to the mass and the spring constant the amplitude is inconsequential
October 4, 2016

physics
momentum is conserved the 2nd (larger) piece moves in the opposite direction at 1/3 the speed
October 4, 2016

physics
P = m g h / t = 100 * 10 * 6 / 120 answer is in Watts
October 4, 2016

Calculus II
If f(x) - x cos (x), how many intervals would be needed to approximate with the Trapezoidal Rule with an error of E<.01?
October 3, 2016

Math 115
a million is a thousand thousand (276.5 / 3150.4) thousand per mi^2
October 2, 2016

Physics
Tn = d / 40 Ts = d / 60 Save = 2d / (5d / 120)
October 2, 2016

Physics
.6 g = v^2 / r
October 2, 2016

Calculus
f(x) = x^2 has a critical point (and a MINIMUM) at x=0 f(x) = (x^3 + 3x^2 - 4x - 12) / (x+2) ... has a critical point (and a "hole" at x=-2)
October 2, 2016

College math
p(white) = 9/24 = 3/8 p(green) = 8/24 = 1/3 p(w then g) = 3/8 * 1/3
October 1, 2016

Math (Condensing logarithmic expression)
ln{5^2 * [x / (x^2 + 1)^2]^3}
October 1, 2016

ACT math
h + s = 10 ... s = 10 - h 12 h + 14 s = 128 substituting ... 12 h + 14(10 - h) = 128 ... 12 h + 140 - 14 h = 128 ... -2 h = -12
October 1, 2016

Physics
gravitational potential energy becomes kinetic energy m g h = 1/2 m v^2 v = √(2 g h) = √(2 * 9.81 * 15.0)
October 1, 2016

Chemistry
the sulfite ion has a -2 charge Pb(SO₃)₂ the hydrogen phosphate compound is missing a subscript 4 Pb(H₂PO₄)₄
October 1, 2016

algebra 2
3/5 (∛5)^2
September 30, 2016

Physics
compressing 0 cm to 6 cm is equivalent to compressing 0 cm to 3 cm, and continuing to compress 3 cm to 6 cm although the compression lengths are the same for the two parts, the 2nd part takes more work because the resistance of the spring increases with compression 0 to 6 uses...
September 30, 2016

Calculus
points with the same x or y coordinate represent vertical or horizontal chords of the circle the perpendicular bisectors of the chords are diameters, and they give one of the coordinates of the center you can use the distance formula to find the other coordinate of the center ...
September 28, 2016

math
you don't show any of the data, but it's very likely that the line doesn't go through the origin (0,0) there is probably some base rental charge (represented by the intercept)
September 28, 2016

Chemistry
E = m g h ... h = E / (m g) h = 628 kJ / (70 kg * 9.81 m/s^2) 1 Joule = 1 kg m/s^2
September 28, 2016

Physics
the ball is uniformly accelerated by gravity average velocity = ... (final vel. + initial vel.) / 2 6.5 m / 3.1 s = (V fin + 0) / 2
September 28, 2016

Math (calculus 3)
the given height equation is incorrect ... the t^2 coefficient is -16, not -8 solve away...
September 28, 2016

MATH
try again when the bases are the same, just add the exponents 3^2 x 3^2 = 9 x 9 = 81 = 3^4 ... not 9^4
September 28, 2016

MATH
try again when the bases are the same, just add the exponents
September 28, 2016

help plzz asap
the trains are closing at 110 mph ... (50 + 60) t = d / r = 330 mi / 110 mph
September 28, 2016

Physics
the .410 coefficient means that the max acceleration is .410 g
September 28, 2016

Physics - EMERGENCY PLEASE HELP
v^2 / r = 5 g r = v^2 / (5 g) r = (288 km/h)^2 / 49 m/s^2 r = (80 m/s)^2 / 49 m/s^2
September 28, 2016

Math
Oops forgot one step Ignore my first answer Step 1.)5*15=x Step 2.)x*5=Answer
September 27, 2016

Math
Step 1.) 5*15=x Step 2.)x*4=Answer
September 27, 2016

Math~ Algebra 1
Thank You
September 27, 2016

Math~ Algebra 1
Two cars are traveling on the same highway. The first car is traveling at an average rate of 44mi/h. The second car leaves an hour late traveling at an average rate of 55mi/h. How long will the cars have traveled when the second car catches up with the first car?
September 27, 2016

Math
2 dived by 1/4= 8 banners
September 27, 2016

Science
the -256 C gas is hydrogen oxygen is -183 C they are both diatomic gases the volume of hydrogen (g) produced is twice the volume of oxygen (g)
September 27, 2016

Algabra
H < D < T H + 2 = D ... D + 2 = T 3 D = 2 T + 13 3 D = 2 (D + 2) + 13 = 2 D + 17
September 26, 2016

Math
draw a picture of the map for b they give you all the dimensions you need
September 26, 2016

Math
6 inches on the map equals 72 miles on the ground a. 1 inch equals 12 miles b. 2 inches on the map equals 24 miles on the ground
September 26, 2016

Math
L + P + N = 4050 L = P - 326 2 (L + P) = N L + P + 2L + 2P = 4050 L + P = 1350 (P - 326) + P = 1350 2 P = 1676
September 26, 2016

physics
the trains are closing at 50 kph (25 + 25) they start 150 km apart, so it takes them 3 hr to meet (and pass) the bird flies for 3 hr at 50 kph, so it flies 150 km
September 26, 2016

physics
the speed of sound in air is approximately 340 m/s the speed of light (from the flash) is approximately 3E8 m/s ... instantaneous for practical purposes so the distance to the bolt is ... 3 s * 340 m/s
September 26, 2016

Biology
if the dress absorbed red light, then red would not be reflected to your eyes ... the dress would not look red
September 26, 2016

chemistry
carbon dioxide is 32/44 oxygen by mass 3.70 g / (32 / 44)
September 24, 2016

physical science
weight is directly proportional to mass and gravitational acceleration ... w = m g w = 81.4 * (8.87 / 9.81)
September 24, 2016

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