Friday
July 1, 2016

Posts by Scott

Total # Posts: 989

math
what question?
July 1, 2016

Math(HELP PLEASE )
given table?
July 1, 2016

math
the (2,½) is correct not the same as (2 , 2/1) there is only one solution
July 1, 2016

physics
0 = ½ g t² + v₀ t + h 0 = -4.9 * 6² + 24 * 6 + h
June 30, 2016

Physics
V = √(2 g h) momentum is conserved ... .2 * V = (.2 + .4) v
June 29, 2016

Calculus
v = x (16 - 2x)² solve for the volume take the 1st derivative (dv/dx), and set equal to zero solve for x test the two solutions
June 29, 2016

Math2
the distance below the mean of Bob's pumpkin (z-score) is ... (938.23 - 1029.51) / 674.29 use a z-score table to find if the value lies in the upper 55.17% of entries looks like he just missed...
June 29, 2016

Math( Assignment Due Today)
h / Da = tan(35º) Da / 42 m = tan(30º) h = 42 m * tan(35º) * tan(30º)
June 29, 2016

Physics
gravity is providing the centripetal force (keeping the satellite on a circular path) a = v² / r you have a and r, just make the units consistent (a to km OR r to m)
June 29, 2016

Physics
a = (30 - 20) km/h / 1.5 s t = (36 - 30) km/h / a
June 29, 2016

Physics
answered
June 29, 2016

math
(1 - .04) * 1000 = (.25 + .05) * t
June 28, 2016

Physics
the radius of the Earth is ... 6371 km g (at the surface) is ... 9.81 m/s² (a) using the inverse-square relation ... a / g = (7000/6371)² (b) the velocity of the satellite is ... v² / r = a ... v = √(a²/r) ... keep the units consistent by converting a...
June 28, 2016

Chemistry
there is one mole of NaCl and two moles of H₂O
June 28, 2016

Admaths
constant distance from a point is a circle, centered at the point x = k is a vertical line, tangent to the circle so the radius of the circle is k-1 (x - 1)² + (y - 2)² = (k - 1)²
June 28, 2016

math
the store buys the items for some cost (c), and then marks up the selling price to 140% of c (cost plus profit) the 10% price reduction means that the sale price is 126% of c (140 - 14) the cost (c) doesn't change, so the profit is reduced to 26% (126 - 100)
June 28, 2016

math
14 N is half of 28 N, so it must be placed twice as far from the fulcrum for equilibrium 8 * 28 = d * 14
June 27, 2016

mathemarics
A. (17,12) B. d = √(20² + 16²)
June 27, 2016

geometry
2.) (3,-½)
June 27, 2016

geometry
8 units apart in the x-direction 3 units apart in the y-direction d = √(8² + 3²)
June 27, 2016

Math
it takes 600 man-hr to reap the field 600 / (8 * 15)
June 26, 2016

chemistry
how many pairs of electrons can be put into these orbitals? s -- 1 p -- 3 d -- 5 a degenerate orbital can hold a pair of electrons
June 26, 2016

math
v(x) = x (8 - 2x)(5 - 2x)
June 26, 2016

Probability
there are 24C2 ways of selecting two movies there are 9C2 ways of selecting two Barney movies the probability is ... 9C2 / 24C2
June 25, 2016

Physics
ave. velocity = (20 + 0) / 2 = 10 m/s .04 m / 10 m/s = .004 s
June 25, 2016

math
1.2 b + .9 b = 2.1 b 2.1 b / 2 b = 1.05 1.05 - 1 = .05 = 5% profit
June 25, 2016

math
f , s , t .6 t , .5 t , t .6 t / .5 t = 1.2 = 120%
June 25, 2016

Algebra
m = 37 h - 1500
June 25, 2016

Physics
one charge is attracting and the other is repelling the 3rd charge must be farther from the larger charge and not between the two charges remember inverse square law 7.25 / (d + 20)² = 2.00 / d² 7.25 d² = 2 d² + 80 d + 800 5.25 d² - 80 d - 800 = 0 use ...
June 24, 2016

Chemistry
the molar mass of NaCl is ... 58.44 g the molar mass of KI is ... 166.00 g
June 24, 2016

Probability
it's a binomial expansion (r + t)¹⁰ ... you want the 8th term 10C7 [(40/75)³ (35/75)⁷]
June 24, 2016

Science
wavelength = velocity / frequency λ = 3.0E10 cm/s / 6.0E18 hz
June 24, 2016

Physics
the s.a. of a sphere is ... 4 π r² or ... π d² km² = 1E6 m²
June 23, 2016

math
6497 , 5579 , 5993
June 23, 2016

Math
1.11 x = 5173
June 23, 2016

Physics
(a) f = m a = .02/32 * 1E5 = 63 lb (b) yes ... Newton's 3rd Law ... equal and opposite reaction (c) .007 s * 1E5 ft/s² = 700 ft/s sounds like an air rifle
June 22, 2016

Physics
the longest wavelength (lowest energy) would be from the 2nd excited state to the 3rd excited state
June 22, 2016

Physics
the plane must fly northeasterly so that its north velocity component equals the south velocity component of the wind 250 sin(Θ) = 50 sin(45º)
June 22, 2016

Math
the height of the satellite and the line through the stations form the right angle of a right triangle there are two hypotenuses (hypoteni?), one from each of the stations to the satellite curious as to how you found A) without the height h / a = tan(87º) h / (a + 35) = ...
June 22, 2016

Physics
v² / r = g sin(2Θ) / 2
June 22, 2016

Physics
u - u/20 = 19u/20 = .95u .95² = .9025 the bullet loses about 10% of its energy (kinetic), as work passing through the plank it should stop in the 11th plank
June 22, 2016

Algebra
salary = 1800 + (sales * .042) 4824 = 1800 + .042 s 3024 = .042 s
June 21, 2016

Physical Science
(6.38E6)² / .89 = (6.38E6 + h)²
June 21, 2016

Physical Science
h = ½ g t² ... .3 = ½ * 9.8 * t² t = √(.6 / 9.8) distance = 3.1 * t
June 21, 2016

Mathematics
almost ... 12/4 = 3 ... not 8 (not an exponent)
June 21, 2016

statistics
this is a binary expansion (h + t)⁴ the term you want is...6 h² t² 6 * (2/3)² * (1/3)² = 24/81 = 8/27
June 21, 2016

Physical Science
F = G * (m₁ m₂) / r² F = 6.7E-11 * 4.8E24 / (6.4E6)² N
June 21, 2016

Math1(Please Help Me)
A.) about 99% of a normally distributed population lies within 2½ standard deviations of the mean 159 cm ± (2½ * 5 cm) 65.9 kg ± (2½ * 12.7 kg) B.) the weight seems more variable because the s.d. is a larger fraction of the mean C.) 7 cm ...
June 21, 2016

physics
d = r * t (80 * t/2) + (40 * t/2) = 60 120 t = 120 ... t = 1 r = d / t = 60 km / 1 hr = 60 km/hr
June 21, 2016

Math1
A.) the data is clustered around a central value (mean), with fewer data points towards the edges B.) from statistical software ... mean = 195.5 , s.d. = 18.33 231 lbs is 1.94 s.d. above the mean [(231 - 195.5) / 18.33] this represents 2.6% of the population .026 * 218 = 5.67...
June 20, 2016

Math
2x² + 5x - 52 = 0 (2x + 13) (x - 4) = 0 x = 4
June 20, 2016

Chemistry
you need 7 moles of HCl for a complete reaction 7 moles / .85 M/L =
June 20, 2016

algebra
x = 5 is correct
June 20, 2016

Math (pre-celc 12)
you are correct
June 20, 2016

Please Help Me!
A.) the data is clustered around a central value (mean), with fewer data points towards the edges B.) from statistical software ... mean = 195.5 , s.d. = 18.33 231 lbs is 1.94 s.d. above the mean [(231 - 195.5) / 18.33] this represents 2.6% of the population .026 * 218 = 5.67...
June 20, 2016

math
3.54E7 m / 3.00E8 m/s = 1.18E-1 s
June 20, 2016

Math
60º is 1/6 of the circle a = [π (7/2)²] / 6
June 20, 2016

math
angle?
June 20, 2016

math
answered
June 20, 2016

math
the area of an isosceles right triangle is one half the square of the hypotenuse a = 3² / 2
June 20, 2016

Math
w = 250 m / tan(50º)
June 19, 2016

Maths
adding 6 ... 2 < 2x < 18 dividing by 2 ... 1 < x < 9 integers greater than 1 and less than 9
June 19, 2016

Physical Science 8th Grade
1. in a surface wave (like water); the water goes up and down, but the wave travels across (parallel to) the surface 2. energy is transferred 3. sound 4. c 5. parallel to (sound)
June 19, 2016

Maths
w = 250 m / tan(50º)
June 19, 2016

Physics
power is power...mechanical or electric...measured in Watts watt = Joule/s = volts * amps watt·sec = Joule kilowatt·hr = 3.6 MJ energy = energy
June 19, 2016

math
(59 - 3) / 4 = 14 14 + 1 = 15 terms
June 19, 2016

Math
z1 = 50 kg c2 = 150 kg t1 = 4/3 t2 4/3 t2 + t2 = 140 kg ... 7/3 t2 = 140 ... t2 = 60 kg ... t1 = 80 kg c1 = 200 kg - 50 kg - 80 kg = 70 kg c1 + c2 = 220 kg
June 19, 2016

Math
implicit differentiation 2 x dx/dt - 2 y dy/dt = 0 substituting [2*(-3)*(-4)] - [2*2*(dy/dt)] = 0
June 18, 2016

Physics
13 = -½ g t² + 24 t + 2 solve for t...there will be two solutions (up and down) the velocity is...v = 24 - g t ...use the up (smaller) time
June 18, 2016

physic mechanic
momentum is conserved .15 * 3.8 = 4.75 * v
June 18, 2016

physical science
momentum is conserved .16 * 25 = (85 + .16) * v
June 17, 2016

Science : Physics
balanced means zero net force Newton's 2nd law ... f = m * a if the force equals zero, then the acceleration also equals zero
June 17, 2016

Geometry
1 + 2 + 3 is a straight angle (180º) 3 is a right angle (90º) 1 + 2 = 90 = x + x - 6 = 2 x - 6
June 17, 2016

Science : Physics
the work done in stopping is... f * d ... 60 * 26.3 = ? J the work equals the initial kinetic energy of the object... ½ m v² 60 * 26.3 = ½ * 15 * v² v = √(8 * 26.3) m/s be aware of significant figures...
June 17, 2016

Math
1 + 2 + 3 is a straight angle (180º) 3 is a right angle (90º) 1 + 2 = 90 = x + x - 6 = 2 x - 6
June 17, 2016

MATHS
(120 / 2) √2 + 150
June 17, 2016

math
a) use fooplot dot com b) 4 ft c) set h=0 , then solve for t d) set h=30 , then solve for t ... two solutions e) never f) axis of sym ... 50 / (2 * 16) g) use value from f) in h(t)
June 16, 2016

Please Help
the smallest value for (X-5)² is zero so the range is any real number greater than or equal to 7
June 15, 2016

Algebra
they close the distance at 32 mph (128/4) x + x/3 = 4x / 3 = 32 mph
June 15, 2016

Math
they are separating at the rate of 125 mph s + s + 15 = 125 ... 2 s = 110
June 15, 2016

college algebra
no male non-smokers 17 smokers ... 5 female, 12 male 13 non-smokers, all female
June 15, 2016

math
3³ + 3 - (3/3)
June 15, 2016

Physics
his energy (gravitational) is ... m g (h+d) = 45 * 9.8 * (7+d) the depth (d) he reaches is based on the work done by the water ... w = f d = 1500 d 1500 d = 45 * 9.8 * (7+d) f = m a ... a = f / m his deceleration is the net force (gravity minus water) divided by his mass a...
June 15, 2016

science
two quarts is four pints (4 * 30%) + (3 * 20%) = (4 + 3) * x
June 15, 2016

science
her mass is the same -- 24 kg her weight is 1/6 of her weight on earth
June 15, 2016

maths
a) v = ⅓ π r² h = 16 π b) the radius of the circle is 5 cm ... √[(8/2)² + 3²] = 5 Θ = 2 π * 8 / 10
June 15, 2016

Maths
the ladder, wall, and ground form a Pythagorean triple (like 3-4-5) this one is 5-12-13
June 13, 2016

Physics
F = charge * velocity * field strength F = 2.76E-13 N
June 13, 2016

Physics
the normal force is equal to the gravitational force ... m g
June 13, 2016

Maths
12 pens out of 40 are neither red nor green a randomly selected pen has a 12/40 or .3 probability of being in this group not sure where 3/4 comes from...
June 13, 2016

Algebra
a negative number, multiplied an odd number of times, is still negative no real number, multiplied an even number of times, can be still negative pos times pos is pos neg times neg is pos
June 13, 2016

Physics I (Classical)
for b) and c), determine the force (Q) using the acceleration components and the components of (P) ... you have the mass of the block f = m a ... by components
June 13, 2016

Engineering science
distance up equals distance down time up equals time down 3.5 s to peak g = 9.8 m/s² average velocity = (3.5 * 9.8) / 2 total distance = (ave vel) * 7
June 12, 2016

Chemistry
12.5 mM HCl and 7.5 mM KOH after netralization ... 5.0 mM HCl in 75.0 mL of solution ... .067 M HCl pH = -log[H⁺] = -log[.067]
June 12, 2016

Math
the amount of flour needed is directly proportional to the number of cakes...more cakes, more flour the constant of proportionality (k) is the flour per cake 4⅗ * k = 2/3 dividing both sides by 4⅔ k = 10/69 lb/cake seems more like a cupcake...
June 12, 2016

Science
yes
June 11, 2016

Physics
work is ... force times distance you have both ... 125 N , 45 m
June 11, 2016

Calculus
a b = 2 ... a = 2 / b s = a + b = 2/b + b ds = db (-2/b² + 1) ds/db = -2/b² + 1 = 0 b = √2 s = 2√2
June 10, 2016

Physics
your analysis looks okay your problem might be too many significant figures in your result
June 9, 2016

Biostatics
15.9% of the fish have lengths more than 1 standard deviation below the mean
June 8, 2016

  1. Pages:
  2. 1
  3. 2
  4. 3
  5. 4
  6. 5
  7. 6
  8. 7
  9. 8
  10. 9
  11. 10
  12. Next>>