Thursday
December 18, 2014

Posts by Jennifer


Total # Posts: 2,051

Physics
P(water) = P0 + d*g*h where P is the pressure of water, P0 is the atmospheric pressure of the air at the surface of the water, d is the density of water, g is the constant acceleration due to gravity, and h is the depth of the water beneath the surface 1000*P0 = P0 + 1025*9.8...
November 15, 2012

chem
A solution is prepared by dissolving 25 grams of sodium sulfate in enough water to give a total volume of 500. mL. The molar mass of sodium sulfate is 142 grams per mole. What is the molarity of the solution?
November 14, 2012

finite math
There are 4 aces in a deck of 52 cards. The probability of an ace being in any position in the deck is 4/52 = 1/13. The probability of an ace being in the 3rd position is 1/13
November 13, 2012

Physics
x = vx*t y = 0.95 - 1/2*g*t^2 where x is the displacement in the horizontal direction, y is the displacement in the vertical direction, and t is time, vx is the speed of the cart in the x direction, and g is the acceleration due to gravity = 9.8 At it's landing, x = 0.4, y...
November 13, 2012

math
Go through the numbers 1 through 100, cross out all the numbers that are divisible by 2 (except 2), then the numbers that are divisible by 3(except three), then the numbers that are divisible by 5 (4 should be crossed out because it was divisible by 2) Do this all the way up ...
November 13, 2012

math
The factors of 100 are 1, 2, 5, 10, 20, 25, 50, 100 8%
November 13, 2012

math
8x/y2*4y/7x
November 12, 2012

physics
The rotational energy of each astronaut is 1/2 * I * omega^2 where I is the moment of inertia, and omega is the angular speed. The moment inertia of the astronaut is m*r^2 r = 12.0 / 2 = 6 m v = 5 m/s = omega*r The total rotational energy is 1/2 * I * omega^2 + 1/2 * I * omega...
November 11, 2012

Physics
Set the centripetal acceleration to the acceleration of gravity v^2/r = g
November 11, 2012

physics
F*r = I*alpha where F is the force, r is the radius, I is the moment of inertia, and alpha is the radial acceleration 470*0.370 = I * 0.8
November 11, 2012

math
5 out of 10 columns are multiples of 2, so 50% of all numbers are multiples of 2 2 out of 10 columns are multiples of 5, so 20% of all numbers are multiples of 5. The % of the numbers that are multiples of both 2 and 5 us 50% * 20% = 10%
November 11, 2012

calculus
Imagine what is happening from (-infinity < x < infinity) 1). from -infinity to x = -2, the graph is going up, then reaches a maximum at x = -2 2). From x = -2 to x = 1, the graph is going down to the minimum at x = 1 3). From x = 1 to x = 6, the graph goes up again to ...
November 11, 2012

Physics
You have two components of acceleration: a(centripetal) = v^2/r, which is the centripetal acceleration directed inward towards the center of the circle. dtheta/dt = omega = 2*a*t v = omega*r The second component of acceleration is the tangential acceleration, a(tangential) = (...
November 11, 2012

physical science
1/p + 1/q = 1/f M = -q/p where p is the distance of the object from the lens, q is the distance of the image from the lens, M is the magnification of the object. If M is positive the image is virtual and inverted; if M is negative the image is real and upright (erect). f is ...
November 10, 2012

Algebra
fc + (11-4)*b = fc + 7*b = 33 fc + (19-4)*b = fc + 15*b = 55 where fc is the fixed charge of the first 4 bushels, and b is the price per bushel of each additional bushel over 4 Use algebra to solve these two equations for b and fc: fc + 7*b = 33 fc + 15*b = 55
November 10, 2012

algebra
For every unit of increase in x, there is a 2 unit increase in y: k = 2 y = 2*x - 3
November 10, 2012

science
(p+q)^2 = 1 30% of the population have tt: q^2 = 0.3 p^2 + 2*p*(0.3^0.5) + 0.3 = 1 Solve for p p^2 is predicted frequency of TT 2*p*q is predicted frequency of Tt q^2 is predicted frequency of tt
November 10, 2012

Physics
F - csf*N = 0 N - m*g = 0 where F is the force, csf is the coefficient of static friction, N is the normal force, m is the mass of the cabinet, and g is the gravitational constant.
November 10, 2012

Physics
a) diameter = 2*radius = 0.15 m; radius = 0.15/2 area = pi*radius^2 b)Work = Force*distance = 160*0.15
November 10, 2012

probability
5*4 (color1, style1), (color1, style2), (color1, style3), (color1, style4), (color2, style1) . . .
November 10, 2012

math
3/3
November 10, 2012

Science
Looks good to me
November 10, 2012

Physics
a) The center of mass of the can is halfway up; the center of mass of the soda in the can is also halfway up when the can is full of soda, so the center of mass is (0.135*(12.4/2) + 1.25*(12.4/2))/(0.135+1.25) b) After the can loses all the soda, the center of mass is the ...
November 9, 2012

Physics or Math
The torque is about the point (-1.3, 2.4), so treat this as your origin,. . . This makes the r vector (4.3, -2.4, 0)
November 9, 2012

Physics
Use conservation of momentum: (65+0.18)*2.47 = .18*24.3 + 65*vf where vf is final speed of the ice skater b).Again, use conservation of momentum: 0.18*24.3 = (62+0.18)*vf
November 9, 2012

Physics
sum(F) = m*a where sum(F) is the sum of the forces, m is mass, and a is acceleration: 30 - 20 = 50*a
November 9, 2012

Physics
400 = 2*a(cb) where a(cb) is acceleration of the cannon ball 400 = 500*a(c) where a(c) is acceleration of the cannon
November 9, 2012

Physics
F = m*a where F = force, m is mass, and a is acceleration 25 = m * 5
November 9, 2012

college algebra, Please help!!
A. is f(-2) = 9? if it is, then the point (-2,9) is on the graph. Otherwise, it's not on the graph B.Plug 2 into f(x) f(2) = 2 * (2^2) - 2 - 1 The points on this graph are (2, f(2)) C. Solve -1 = 2*x^2-x-1 You should find two solutions for x. D. The domain of f is the ...
November 9, 2012

Physics
For an elastic collision, both momentum and kinetic energy are conserved. m1 = mass of colliding ball m2 = mass of ball initially at rest v1i = initial speed of colliding ball v1f = final speed of colliding ball v2i = initial speed of at rest ball = 0 v2f = final speed of at ...
November 9, 2012

math
I say c 127.1 / (127.1+32.1) = %Cu 32.1 / (127.1 += 32.1) = %S
November 9, 2012

physical science
F*d = W Where F is force, d is distance moved, and W is work
November 8, 2012

math
$3.96 = 396 cents 396 cents / 17 ounces is price in cents/ounces
November 8, 2012

math
8:9
November 8, 2012

Science
Look up the speed of sound, then multiply this number by 6 s.
November 8, 2012

Physical Science
v = f*lambda where v is the speed of sound, f is the frequency, and lambda is the wavelength
November 8, 2012

physics
For an elastic collision, both momentum and kinetic energy are conserved. Conservation of momentum: m1*v1 + m2*v2 = m1*v1f + m2*v2f where m1 and m2 are the mass of the car and truck, v1 and v2 are the initial speeds of mass 1 and mass 2, and v1f and v2f are the final speed of ...
November 8, 2012

math
There are a total of 6*6 =36 possible combinations for a sum of 8, you can have: (6,2) (2,6) (3,5) (5,3) (4,4) Probability = 5/36 For a sum of 9, you can have: (6,3) (3,6) (4,5) (5,4) Probability of 4/36 For a sum of 10, you can have: (5,5) (6,4) (4,6) For a probability of 3/36
November 8, 2012

PHYSICS
The buoyant force acting on the balloon is (p1V1 - p2V2)g where V1 = V2 = 318 m3 p1 is the density of air p2 is the density of helium c) The net force is the buoyant force - m*g, where m is the mass of the balloon. If the net force is positive, the balloon will rise d BF - m*g...
November 8, 2012

Math
What value of b makes the equation below true? b+1/4=12/12 Please show work Thanks
November 7, 2012

Math
What value of b makes the equation below true? b+1/4=12/12 Please show work Thanks
November 7, 2012

math HELP!!!!!!!!!
Just multiply each coordinate by two (–1, 2) and (3, –3) gives ( -2 . . . . )
November 7, 2012

Chemistry
P1*V1 = P2*V2 when the temperature remains constant. P1 is the initial pressure, V1 is the initial volume, P2 is the final pressure, and V2 is the final volume.
November 7, 2012

physics
Centripetal acceleration is given by a = v^2/r = omega^2*r where a is the centripetal acceleration, v is the speed, r is the radius, and omega is the angular speed in rad/s Convert rev/s to radians per second 595 rev/s * (2*pi radians/rev) = ____ = omega a = omega^2 * 0.02 m b...
November 7, 2012

physics
-k*x = -Ke*q1*q2/r^2 where k is the spring constant, x is the distance stretched by the spring, Ke is Coulomb's constant, r is the distance between the charges. r = 9.00 cm = 0.09 m x= 5 mm = 0.005 m q1 = 2.70 uC = 2.7 * 10^-6 C q2 = -8.6 uC = -8.6 * 10^-6 C Ke = 8.9 * 10^9
November 7, 2012

physics
T = 1/f where f is frequency = 1.5, T is period
November 7, 2012

algebra
v - c = 1.5 v + c = 3.5 where v is Camille's speed in still water, c is the speed of the current Solve for v
November 7, 2012

math
dp/dx = 0, or -20x + 1700 = 0 Solve this for x for part 1, then plug this value of x into p(x) for the answer to part 2
November 7, 2012

Math
Write 2 24/12 as a whole number. Show work.
November 5, 2012

Math
At whole foods market 5/6 of the vendors sell vegetable and 2/4 sell fruit. What fraction of the vendor sell fruit or vegetable?
November 5, 2012

Math
Brenda mixed together 11/12 quart of cranberry juice and 8/15 quart of ginger ale to make punch. How much punch did Brenda make?
November 5, 2012

Math
C+1/5=9/20
November 5, 2012

Math
A capybara is the worlds largest rodent . It can grow to be 1 3/10 m long. Write an improper fraction that represents the length of the capybara? Please show work of how you got answer. Thanks
November 5, 2012

Math
An average 10 yr boy weighs 86 1/2 pounds and has muscles that weigh 34 1/5 pounds. An average 10 yr old girl weigh 82 1/3 pounds and has muscles that weigh 31 1/4 pounds. How much do an average 10 yr old boy and girl weigh together ? With answer can you tell me how you got it...
November 5, 2012

Numerical Analysis
xcosx-2x2+3x-1=0 Evaluate the function at 0.2 and 0.3: 0.2*cos0.2-2*0.2^2+3*0.2-1 = -.280 0.3*cos0.3-2*0.3^2+3*0.3-1 = 0.019 In order for the function to go from y=-.280 to y=0.019 on the interval [0.2,0.3], it must pass through y = 0 at least once. -x*sinx -4x + 3 =0
November 2, 2012

Numerical Analysis
The Taylor series about f(1) to fourth order is: f(x) = f(1) + f'(1)*(x-1) + f''(1)*(x-a)^2/2! + f'''(1)*(x-a)^3/3! The derivative of ln(x) is 1/x f''(x) = -1/x^2 f'''(x) = 2/x^3 f(1) = 0 f'(1) = 1 f''(1) = -1 f''...
November 2, 2012

Numerical Analysis
6 because there are 6 digits in 2.71828
November 2, 2012

Numerical Analysis
The Taylor expansion abour x = pi/4 to sixth order is f(x) = f(pi/4) + f'(pi/4)*(x-pi/4) + f''(pi/4)*(x-pi/4)^2/2! + f'''(pi/4)*(x-pi/4)^3/3! + f''''(pi/4)*(x-pi/4)^4/4! + f'''''(pi/4)*(x-pi/4)^5/5! f(x) = cos(x) f&#...
November 2, 2012

Physics
m*v^2/r <= cf*N where m is the mass of the object, v is the speed of the object, r is the radius, cf is the coefficient of static friction, and N is the normal force = m*g Solve for v
November 1, 2012

science
250 milliliters = 0.25 L; To make a 3.0 M NaOH solution from 6.0 M NaOH, you need equal parts of water and NaOH solution You need 0.25 Liters of the solution, so you need 1/2 * 0.25 = 125 milliliters 6.0 M NaOH, and 125 milliliters water
November 1, 2012

Physics
(1/p) + (1/q) = 1/f M = h'/h = -q/p, Where p is distance of object from lens, q is distance of image from lens, f is focal length of the lens, and M is the magnification f is positive when the lens is convex: 1/50 + 1/q = 1/15 q = 21.4 cm M = -21.4/50
November 1, 2012

Physics
F*r = I * a Where F is the force on the merry-go-round, r is the radius, I is the moment of inertia of the merry-go-round, and a is the angular acceleration for a solid, horizontal disk, the moment of inertia is: 1/2*m*r^2 F*r = 1/2*m*r^2*a F = 1/2*m*r*a w = w0 + a*t where w ...
November 1, 2012

math
Type 2 + (3/4) into your calculator
November 1, 2012

physics
The time elapsed between 12:35 and 3:10 is 2 hr, 35 min or 2 and 35/60 hours distance = 45 * (2 and 35/60)
October 31, 2012

Physics
dsin12.23 = ml, m = 0, 1, 2, ….` where l = 550 * 10^-9 m d = 1/55000 solve for m
October 31, 2012

algebra
2(2-x)<-3x-2 Just start working with the equation as if the < sign was an = sign 4 - 2x < -3x -2 4 + x < -2 x < -6
October 31, 2012

alegbra 1
1). 3y=11-2x 2). 3x=y-11 Using equation 1: y = (11-2x)/3 Substituting into equation 2 3x = (11-2x)/3 - 11 x = (11 -2x)/9 - 11/3 x + 2x/9 = 11/9 - 11/3 11x/9 = 11/9 - 11/3 solve for x Then plug x into either equation 1 or 2, and solve for y 2) Use a similar procedure, as shown ...
October 31, 2012

Math
multiply everything out, then add like terms (2a+3b)(2a-3b) = 2a^2 +6ba -6ab - 9b^2 = 2a^2 - 9b^2
October 30, 2012

6th grade Math
In Euclidean plane geometry, a rectangle is any quadrilateral with four right angles. So a square is a rectangle. You could build up to a prime number of rectangles with a prim number of square tiles.
October 30, 2012

math
42/28 = 6/x Solve for x
October 30, 2012

science
I would think D). Snow can only form if the temperature is below freezing. Otherwise, rain falls.
October 30, 2012

Physics
The rotational kinetic energy of one wheel is 1/2 * I * w^2 where I is the moment of inertia of the wheel, w is the angular speed of the wheel. The total kinetic energy of the system is the sum of the rotational kinetic energies of each wheel, plus the translational kinetic ...
October 30, 2012

Physics
Mass never changes. It is always 95.7 kg Weight = mass * g, where g is the acceleration of gravity at that point
October 30, 2012

physic
24000 = 4000*a
October 30, 2012

Physics
There is not enough information here. You need to be given or have enough information to find rAB, rBC, rAC, where rAB is the distance between mass A and mass B, etc. The magnitude of the force acting on mass A is -G*mA*mB/rAB^2 - G*mA*mC/rAC^2 apply this same model to find ...
October 30, 2012

math
8*b = 64 where b is the number of boxes
October 30, 2012

math
$6*m = $24 where m is the number of mugs
October 30, 2012

math
8*d=56 where d is the number of days
October 30, 2012

physics
x = x0 + v0*t - 1/2*a*t^2 v = v0 - a*t m*a = m*g*uk where x is distance, x0 is the inital x position, v is speed, v0 is the initial speed, a is the acceleration of the crate, t is time, m is the mass of the crate, g is the acceleration due to gravity, and uk is the coefficient...
October 29, 2012

science
Please it's very important :)
October 29, 2012

science
What is a good way to study science? To be more specific Bellwork quizzes?
October 29, 2012

Math
The answer is c. A secant line is a line passing through 2 points of a function; since the tangent line only goes through one point, the slope of the tangent line to a function can't properly be defined as the slope of the secant at that point, because you haven't ...
October 28, 2012

Physics
w = 2*pi*f f = 1/19.9 where f is the frequency of the car going around the track, w is the angular speed around the track, pi is 3.14 w = 2*pi/19.9 =0.315 The speed traveled by one tire is w*r where r is the radius of the wheel The speed traveled by the other tire is w*(r+1.63...
October 28, 2012

chemistry
PV = nRT where P = pressure, V = volume, R is a constant = 8.314 J/mol*K, and T is temperature in degrees Kelvin, n is number of moles degrees K = 273 + degrees C 1 liter = 1000 cm^3 = 1000 cm^3* (1 m / 100 cm)^3 = 1000 * (1/1000000) = 1/1000 = 0.001 m^3 35 L = 0.0035 m^3 P*0....
October 27, 2012

Math
Change 30/20 into a mixed number
October 25, 2012

Math
8/12=
October 25, 2012

Math
How much larger is the 8 in 657,689,004 than the 8 in 789,456,234?
October 25, 2012

english
Direct characterization The author literally tells the audience what a character is like. This may be done via the narrator, another character or by the character him- or herself. Indirect characterization The audience must infer for themselves what the character is like ...
October 25, 2012

math
e^(ln(5-2x)) = e^3 5-2x = e^3 5-e^3=2x x = (5-e^3)/2
October 25, 2012

physics
The lift force L has an x and y component Lx and Ly: Lx = Lsin21 Ly = Lcos21 In the y direction, Lcos21 - 55600 = 0 Solve for L In the x direction Lsin21 - Fair = 0 where F air is the force of air resistance
October 25, 2012

Physics!
The first rope has an x component of force Fx1 and a y component of force Fy1: Fx1 = 57*sin 30 = 28.5 Fy1 = 57*cos 30 = 49.3 The second rope has an x component of force Fx2 and a y component of force Fy2: Fx2 = 57*sin 60 = 49.3 Fy2 = 57*cos 60 = 28.5 The net force in the x ...
October 25, 2012

Math
Ned caught 1/3 pound of fish. Sarah caught 5/12 pound of fish . Jessica caught 1/6 pound of fish. How much fish did all three of them catch?
October 24, 2012

Math
How much larger is the 6 in 657,879,004 than the 6 in 789,456,234?
October 24, 2012

Math
There are 10 tennis balls, 2 soccer balls, and 8 basketballs. What fraction in simplest form are tennis balls?
October 24, 2012

Geometry
Use the corresponding angles converse: If two lines are cut by a transversal and the corresponding angles are congruent, the lines are parallel. The transversal line is along the side of the ship parallel to the water, and the angles of the oars with the water are all ...
October 24, 2012

Physics
When it has stretched from its maximum position, the potential energy stored in the spring is 1/2*k*x^2 = 1/2*450*.5^2 = 56.25 this is converted to kinetic energy: 56.25 = 1/2*m*v^2 = 1/2*8*v^2 Solve for v
October 24, 2012

math
The twelve 1" cubes divided by /3 layers give 4 cubes/layer The shape is four layers of squares, 4 cubes on a side, or a cube with dimensions 4*4*4 cubes.
October 24, 2012

Algrbra
if 0≤x≤ 10000 : R(x) = $12 * 11% *x at x = 10000, R(x) = $12 * 11% *10000 = 13200 10000 < x ≤ 15000 : R(x) = 13200 + $12*12.5%*(x-10000) (The profit made on the first 10000 books + the profit made on books sold above 10000) at x = 15000, R(15000) = 13200...
October 24, 2012

math 7 grade
1*ch1 + 9*ch2 + 81*ch3 = 200 with ch1+ch2+ch3 <= 8 where ch1 is the number of charities belonging to the first group, ch2 is the number of charities belonging to the second group, and ch3 is the number of charities belonging to the 3rd group the number in charity 3 can only...
October 24, 2012

Finance
5000 * (1+x)^7 = 38700 Solve for x
October 24, 2012

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