Friday

January 30, 2015

January 30, 2015

Total # Posts: 2,053

**Physics**

rho1*V1 = rho2*V2 where rho1 is the density of the object; V1 is the volume of the ship; rho2 is the density of the water; V2 is the volume of the water mass of object = 0.97 106/g = 0.97 106/9.8 density of object = 0.97 106/(9.8*0.03*A) where A is the area (0.97 106/(9.8*0.03...
*December 12, 2012*

**geometry**

Determine the approximate midpoint of all the areas serviced, both in terms of distance, and with respect to traffic speed limits, road conditions, etc.
*December 12, 2012*

**College Algebra**

x*y = 480 2x + 2y = 88 solve for x and y, the width and length
*December 12, 2012*

**Physics**

v = v0 - 1/2*g*t^2 where v is speed as a function of time, v0 is the inital speed, and g is the acceleration due to gravity v = 24 - 4.9*t^2 = 0 Solve for t When it returns to its starting point, the time will be 2*t, using t from the first question. Calculate v at this time (...
*December 12, 2012*

**geometry**

tan 60 = 120/x; x = 120/tan60
*December 12, 2012*

**Chemistry..**

London dispersion force is a weak intermolecular force between two atoms or molecules in close proximity of each other. The force is a quantum force generated by electron repulsion between the electron clouds of two atoms or molecules as they approach each other. The London ...
*December 12, 2012*

**Math**

A = P *r*((1+r)^n)/((1+r)^n-1) where A = payment Amount per period P = initial Principal (loan amount) r = interest rate per period n = total number of payments or periods n = 30*12 = 360 P = 250000 4 = 0.045 A = 250000*0.045 * (1.045^360)/(1.045^360 - 1)
*December 12, 2012*

**Physic**

The tungsten filament emits white light, or the entire spectrum of colors of light. (look at any light bulb when its on). When the light is viewed with a spectroscope, it separates the white light into the different colors.
*December 11, 2012*

**math**

The formula for calculating the payment amount is shown below. A = P * ((r(1+r)^n)/(((1+r)^n)-1) Simple Amortization Calculation Formula where A = payment Amount per period P = initial Principal (loan amount) r = interest rate per period n = total number of payments or periods...
*December 11, 2012*

**statistics**

The probability of this combination occurring is (0.23^175) * (0.77 ^625)
*December 11, 2012*

**Math**

Δx/3*[f(x0)+4f(x1)+2f(x2)+4f(x3)+........+2f(xn−2)+4f(xn−1)+f(xn)] = 30/3 * (76 + 4*118 + 2*130 + 4*143 + 2*139 + 4*136 + 2*137 + 4*139 + 2*130 + 4*122 + 60)
*December 11, 2012*

**Chemistry**

The density of maple syrup is 1.33g/mL. a bottle of maple Syrup contains 740mL of syrup. What is the mass of maple syrup?
*December 11, 2012*

**geometry**

An arrow pointing to the bottom left
*December 10, 2012*

**math**

I think that you graph both; if you were asked to graph f>3 AND f< -2, there would be nothing to graph, because there is no intersection of the graphs. But because the selector is OR, you graph all the points for which f>3 (y > 3) or f<-2 (y<-2)
*December 10, 2012*

**math**

2*2*2
*December 10, 2012*

**Physics**

Using conservation of momentum: 2*8 + 4.8*2.8 = (2+4.8)*vf = 6.8*vf Solve for vf, the final speed of the blocks when they have the same velocity. 1/2*k*x^2 = 1/2*m*vf^2 Solve for x; k is the spring constant = 1180 N/m; x is the maximum compression of the spring
*December 10, 2012*

**MATH**

Convert each number to a whole fraction: 4 5/7 = (4*7 + 5)/7 = (28+5)/7 = 33/7 3 2/3 = (3*3 + 2)/3 = (9 + 2)/3 = 11/3 33/7 / 11/3 = 33/7 * 3/11 = (33*3) / (7*11) = 99/77 = (9*11)/(7*11) = 9/7
*December 10, 2012*

**Math**

(x+2)/6 = 3/(x-1) (x+2)*(x-1) = 6*3 = 18 x^2 + 2*x - x -2 = 18 x^2 + x - 20 = 0 (x-4)(x+5) = 0 x = 4 or x = -5
*December 10, 2012*

**math**

4 stripes and 2 colors will make 2*2*2*2 different logos 3 stripes and 2 colors will make 2*2*2 different logos Subtract the two to find the difference
*December 10, 2012*

**Math**

The height at the bottom of the wheel is 2 m; The height at the top is 2 + diameter = 137; The height at the center of the wheel is 2 + radius = 2 + 135/2 The circumference of the London Eye is 2*PI*r = PI*diameter = 135*PI. This is how far a passenger travels as the wheel ...
*December 10, 2012*

**physics**

The resonance frequency is 1/((LC)^0.5) Where L is the inductance = 6 * 10 ^-3 H and C is the capacitance = 2.5 * 10^-6 F
*December 10, 2012*

**physics**

x = 1/2*g*t^2 = 2 = 4.9*t^2 Solve for t, the time then solve for the climber's speed v using v = 9.8*t 1/2*m*v^2 = 1/2*k*xstretch^2; where xstretch is the amount that the rope will stretch
*December 10, 2012*

**Physics ASAP**

Sorry, I can't draw a force diagram of the box. The sum of the forces in the y-direction is zero: N - 20 + 30*sin(37) = 0 Solve for N, the normal force B) The frictional force between the block and the table is defined as µk*N = 0.25*N C) The work done by the ...
*December 10, 2012*

**Physics**

You substitute g of moon for g of earth in the equation; Then do the calculation for g of earth; divide the two to find the ratio.
*December 10, 2012*

**Physics**

Use conservation momentum 0.05*33 = 4.8*v Solve for v, the speed of the launcher
*December 10, 2012*

**physics**

Let F1 and F2 be the forces on the two ends of the bridge. The sum of the forces in the y direction is 0: F1 + F2 - 1120 - 3775 = 0 The sum of the torques about each support is zero: 1120*(L/5) + 3775*(L/2) - F2*L = 0 Dividing by L: 1120/5 + 3775/2 - F2 = 0 Solve for F2, then ...
*December 10, 2012*

**SOCIALS HELP...THANX**

Thank you sooooooo much Rylee. Your a great help! Thanx once again :)
*December 9, 2012*

**SOCIALS HELP...THANX**

This question is based on: the Reign of Terror which government replaced Robespierre and what did that signify for France? Pleese help... Thanx
*December 9, 2012*

**maths --plse help me..**

(a+b+c)^7 = (a+b+c)*(a+b+c)*(a+b+c)*(a+b+c)*(a+b+c)*(a+b+c)*(a+b+c) will be of the form a^7 + c1*a^6*b + c2*a^6*c + c3*a^5*b^2 + c4*a^5*c^2 + c5*a^5*b*c + . . . . where c1, c2, c3 are constants found when doing the actual expansion. so all the terms in the expansion are of the...
*December 9, 2012*

**Physics**

Weight = Lift = Area*(PressureBottom - PressureTop) = (1/2)(air density)*Area*(V2^1 - V1^2) V2 = 63.9 m/s V1 = 58 m/s Look up the air density
*December 8, 2012*

**Chemistry**

27) What volume of benzene (C6H6, d= 0.88 g/mL, molar mass = 78.11 g/mol) is required to produce 1.5 x 103 kJ of heat according to the following reaction? 2 C6H6(l) + 15 O2(g) ¨ 12 CO2(g) + 6 H2O(g) ƒ¢H‹rxn = -6278 kJ
*December 8, 2012*

**Physics**

For small angles, sin theta is approximately equal to tan theta = Y/L = 0.25/2 Calculate the error (0.25/2.01 - 0.25/2)/(0.25/2.01)
*December 8, 2012*

**Chemistry**

Write a balance equation for the reaction of nitric acid (HNO3) with each base solution : [1]. NaHCO3, [2]. MgCO3. ( Please include the phases of the substance)
*December 8, 2012*

**Math**

The slope of the first hill is 17/25. The slope of the 2nd hill is 0.7. Which slope is greater? This is the slope of the steeper hill.
*December 7, 2012*

**Grade 11 MAth**

The midpoint of the range -4 <= y <=1 is y = -1.5 with an amplitude of 2.5 The equation is now of the form: y = 2.5*sin(a*x) - 1.5 When a = 1, the period is 360 degrees. So when a = 45/360; the period will be 45 degrees, or when a = 1/8 y = 2.5*sin(x/8) - 1.5 for the ...
*December 7, 2012*

**pharmacy tech**

convert 164 lb to kg; 5 mg/kg/day * 1day/3doses = 5/3 mg/kg per dose Multiply this number by the weight of the patient in kg
*December 7, 2012*

**math**

let g=green; b=blue; r=red; y=yellow; o=orange This is one example g,b,r,y,o r,y,o,g,b o,g,b,r,y b,r,y,o,g y,o,g,b,r Notice that the order is the same in each line, shifted by 2
*December 7, 2012*

**science**

a. The mass doesn't change; it's still 92 g b. density = mass/volume = 92g/100cm3 c. Is the density of the ice cube less than or greater than the density of water? If it is less than, the ice cube will float. If it is greater than, the ice cube will sink.
*December 7, 2012*

**physics**

the pressures F/A on both pistons should be equal. F = force, A = area 2000/20 = X/1 100 = X ______________
*December 7, 2012*

**math**

3(k-4.8)=0.7(k-6.9) 3*k-3*4.8=0.7*k-0.7*6.9 3k - 14.4 = 0.7k - 4.83 Subtracting 0.7k from each side: 3k -0.7k - 14.4 = 0.7k - 0.7k - 4.83 2.3k - 14.4 = -4.83 Adding 14.4 to each side 2.3k = 9.57 Dividing each side by 2.3: k = 4.16
*December 5, 2012*

**physics**

The bullet goes from rest to a speed of 710 m/s in 2.36 * 10^-3 s v = a*t where v is the speed, a is the acceleration, and t is time 710 = a * 2.36*10^-3 Solve for a Force = m*a where m is mass
*December 5, 2012*

**math**

The total number of answers recorded is 35+35+30 = 100 3 of these answers belong to 1 person: At this point in the problem, person count = 1 answer count = 100-3 - 97 6 used buses as well as their own cars. One of these persons would be the person who used all three; so 5 used...
*December 5, 2012*

**Math**

9 use shampoos A and C. This set of 9 also includes people who would use B. 5 people use all three 9 - 5 = 4
*December 5, 2012*

**math**

140 students owned iPhones; of these 50 also owned cars; 140 - 50 = 90 90 students own only an iphone 60 owned cars; of these 50 also own a car; 60-50 = 10; 10 students own ONLY a car The number of student who own either a car or an iphone, but not both is 90 + 10 = 100 The ...
*December 5, 2012*

**math**

First draw a picture. Split the isosceles triangle down the middle of triangle, bisecting the angle x. Now you have divided the isosceles triangle into two right angled triangles, each with area of 1/2 height * base. So the area of the isosceles is the sum of both of these ...
*December 5, 2012*

**9th grade math**

Start putting all the equations into the same form y = a*x + b A: -x+y=9; y =x + 9 x-y=9; x = 9 + y; y =x-9 These two are not the same B: -x+y=9; y = 9+x x-y= -9; x = -9+y; y = x+9 These two are the same C: -x+y=9; y = 9+x -x-y=9; -y = 9+x; y = -x -9 These two are not the same...
*December 5, 2012*

**Physics**

torque = F*r = I*alpha where F = force, r = radius, I = moment of inertia, and alpha is angular acceleration. a) For a cylinder I = 1/2*m*r^2, where m is mass b) F*r = 1/2*m*r^2*alpha Substitute values from the problem to find m c) omega = alpha*t where omega is angular velocity
*December 5, 2012*

**PHYSICS**

y = A sin(30t - 0.041x) y = -Asin(0.041x - 30t) this is of the form y = A*sin(k*x - omega*t) k = 0.041 omega = 30 where omega = 2*pi*f; 30 = 2*pi*f; where f is frequency; use this to solve for answer in a) b) k = 2*pi / lambda, where lambda is wavelength; c) the speed of the ...
*December 5, 2012*

**physics**

omega = (k/m)^0.5 T = 2*pi/omega where T is period, omega angular acceleration
*December 5, 2012*

**physics **

Consider the mass on a spring in the figure below. If the spring constant is k = 28 N/m and the mass is m = 2.1 kg, what is the period? _____ s Any help will be appreciated.Thank you.
*December 5, 2012*

**Physics**

A large suitcase full of gold sits at the bottom of a lake. A team of treasure hunters uses a crane to recover the suitcase and finds that a force of 2.6 105 N is required to lift the suitcase to the surface. What is the volume of the suitcase? _____m^3
*December 5, 2012*

**Physics 1**

The antinodes of a wave would be a crest; the node of a wave would be where the wave is at 0; The separation of nodes and antinodes are 1/4 wavelength; the wavelength is 0.052*4
*December 5, 2012*

**Physics 1**

When all the mechanical energy is kinetic energy, the energy is 1/2*m*v^2 = 1/2*m*omega^2*r^2 where m is the mass, r is the radius, and omega is the angular velocity; For a pendulum, the angular velocity is given by omega = (g/r)^0.5
*December 5, 2012*

**Physics 1**

T = 2*pi/omega where T is the period 0.14 = 2*pi/omega Solve for omega omega = (k/m)^0.5 where k is the spring constant; use algebra to solve for k
*December 5, 2012*

**Alegbra I HELP!**

It looks like the charged line is the Time(min)*(1 dollar/min) + $3
*December 5, 2012*

**Physics**

The initial heat of the water and can is 600*Cw*25 + 55*0.1*25 + x*Cw*65 The final heat of the water and can is (600+x)*Cw*31 + 55*0.1*31 Set the inital and final heat equal to each other, and solve for x; You will have to look up the specific heat of water (Cw), it should be ...
*December 5, 2012*

**physics**

Tf = (9/5)*Tc+32 where Tf is the temperature in Fahrenheit, Tc is the temperature in degrees Celsius
*December 5, 2012*

**physics**

A 5kg mass was lifted 365cm, how much work was done against gravity?
*December 4, 2012*

**Physics**

Use conservation of momentum, and conservation of kinetic energy for an elastic collision. m*30 + m*-20 = m*v1 + m*v2 where v1 is the final speed of the first ball, v2 is the final speed of the second ball Simplifying the equation (dividing both sides by m, adding like terms) ...
*December 2, 2012*

**physics**

In an elastic collision, both momentum and kinetic energy are conserved. Conservation of momentum m*3 = m*vA + 2m*vB or 3 = vA + 2*VB where vA is the speed of A, and vB is the speed of B Conservation of kinetic energy: 1/2*m*3^2 = 1/2*m*vA^2 + 1/2*2*m*vB^2 9 = vA^2 + 2*vB^2 ...
*December 2, 2012*

**Physics**

E = ke*|Q|/r^2 where ke is Coulomb's constant, Q is the charge, r is the distance from the charge E = (ke*10^-4)/0.3^2
*December 2, 2012*

**Math**

A black and red card are independent because you cannot draw a black card that is also a red card. A black card and a queen are not independent because you can draw a card that is both black and a queen. A face card and a queen are not independent because you can draw a card ...
*December 2, 2012*

**Phusics**

The kinetic energy of an object is 1/2*m*v^2, so an object moving in the y direction will have a speed, and therefore also kinetic energy (KE) If you apply a force in the Y direction the velocity will not necessarily increase, only if the object experiences a net force. For ...
*December 2, 2012*

**Physics URGENT!!!**

fo=(1/(1Â±vs/v))fs Where the plus sign is negative if the source is approaching the observer and positive if the source is moving away from the observer. fo is frequency of the observer fs is the frequency of the source vs is the speed of the source v is the speed...
*December 2, 2012*

**Physics**

Assume that the boxcars all have the same mass. Use conservation of momentum: 2*m*vi = 3*m*vf where m is the mass of one boxcar, vi is the initial speed, vf is the final speed. 2*m*4 = 3*m*vf vf = 8/3 Initial kinetic energy is ki 1/2*(2*m)*vi^2 = m*4^2 = 16*m Final kinetic ...
*December 2, 2012*

**physics**

First, find the equations that are pertinent to the problem. F(spring) = -k*x where F(spring) is the force on a spring, k is the spring constant, and x is the displacement. w = (k/m)^1/2 where w is the angular acceleration, m is the mass of the spring T = 2*PI/w where T is the...
*December 2, 2012*

**history**

Do you think that the Korean War was merely a civil war in which the United States supported one side, or should it be considered an international war in which the United States used the United Nations to further its anticommunist policie? Can someone please help me thank you!
*November 30, 2012*

**PreCalculus**

Suppose that a polynomial function of degree 5 with rational coefficients has -2, 5, and 3 - I as zeros. Find the other zeros.
*November 29, 2012*

**algebra**

x*((1 + .07/12)^(49*12)) = 500,000 Solve for x
*November 29, 2012*

**physics**

y = y0 + v0*t - 1/2*g*t^2 where y0 is the initial height = 0, v0 is the initial speed, and g is the acceleration due to gravity, t is time, and y is the vertical position. The ball reaches it's maximum height when dy/dt = 0 = v0 - g*t and y = 5, so 5 = v0*t - 1/2*g*t^2 Use...
*November 29, 2012*

**Linear equation**

Start making a table of points. For y=4, for any value of x, y = 4 x y -4 4 -3 4 -2 4 -1 4 0 4 1 4 2 4 3 4 The graph will be a horizontal line through (0, 4)
*November 29, 2012*

**Algebra2**

Get all equations in the form y = m*x + b. Once it's in this form, m is the slope, b is the y intercept. 1. 2x-3y=6 2x - 6 = 3y y = 2/3x - 2 The slope is 2/3, the y intercept is -2 2. y=-2x y = -2x + 0 The slope is -2, the y-intercept is 0. 3. y = 3 y = 0*x + 3 The slope ...
*November 29, 2012*

**pre algebra**

-5 x 1 x 11 x 4 Look for multiplying numbers together that end up being multiples of 10; -5*4 = -20, so using the associative property -5 x 1 x 11 x 4 = (-5 x 1 x 11) x 4 Using the commutative property: = 4*(-5 x 1 x 11) = 4*-5 x 1 x 11 = (4*-5) x (1 x 11) = -20 * 11 Factoring...
*November 28, 2012*

**Physics**

For an elastic collision, both kinetic energy and momentum are conserved. Conservation of momentum m(He)*v(He,initial) = m(He)*v(He,final) + m(H)*v(H) where m(He) is the mass of the Helium, v(He, inital) is the initial speed of the Helium , etc. . . Conservation of kinetic ...
*November 28, 2012*

**Physics**

.92^3
*November 28, 2012*

**Physics**

Set the force of gravity equal to the force of the centripetal acceleration: G*m*M/r^2 = m*v^2/r r is radius of orbit, G is gravitational constant, M is mass of earth, m is mass of satellite (which cancels out of both equations), v is the speed of the orbit
*November 28, 2012*

**College Algebra**

h = 0.62*w where h is height, w is width P = 2*h + 2*w = 2 = 2*0.62*w + 2*w solve for w, then use first equation to solve for h
*November 28, 2012*

**5th math**

1: 2 2: 5 3: 3 4: 5 5: 4 6: 5 You'll notice that all the even numbered terms in the sequence(2nd term, 4th term, 6th term, etc.) are 5 The odd numbered terms in the sequence each increase by 1. So the next three terms should be 5, 5, 6
*November 28, 2012*

**Probabilty**

For each coin toss, the probability of x=1 is 0.4. The mean value of X for n tries is : (0.4(1)*n)/n = 0.4
*November 28, 2012*

**Calculus**

dy/dx = (x*y)^0.5 Integrate and solve for y, find the constant by making sure it passes through (1/2)
*November 27, 2012*

**college algebra**

log10(7^x) = log10(8) Using log rules (log(a^b) = b*log(a)) x*log10(7) = log10(8) x*.845 = .903 = log(8)/log(7) x = 1.068 to 3 decimals
*November 27, 2012*

**trig**

Should this be Q IV (quadrant 4) tan-1(-4/3) = -53.13 degrees (-53.13 degrees = 360 + -53.13 = 306.87, is in quadrant 4) Evaluate with your calculator cos(2*306.87)
*November 27, 2012*

**calculus**

Use some trig identities: tan(-x) = tan(x) csc(x) = 1/sin(x) tan(x) = sin(x)/cos(x) tan(-x)*csc(x) = tan(x)*(1/sin(x) = (sin(x)/cos(x))*(1/sin(x) = 1/cos(x) = sec(x)
*November 27, 2012*

**calculus**

cos(theta) = 3/5 Use your calculator: cos-1(3/5) = theta = 53.13 degrees This is the value that your calculator gives, and it is in quadrant; To find the value theta corresponding to quadrant 4, notice the symmetry in a graph of cos x, which is that cos(x), cos(x) = cos(360 - ...
*November 27, 2012*

**math**

The slope m of a line passing through two points (x1, y1), (x2, y2) is given by m = (y2-y1)/(x2-x1) m = (-5/6 - -5/4) / (-3-2/3) = (5/12) / (-11/3) = -15/132 = -5/44 The equation for a straight line is of the form y = m*x + b where m is the slope and b is the y-intercept. So ...
*November 27, 2012*

**Physics**

Use conservation of momentum Initial momentum: The momentum of inertia of the objects the students is m*r^2 (3.0 + 3.4*1^2 + 3.4*1^2)*wi = (3.0 + 3.4*.45^2 + 3.4*.45^2)*wf where wi = 0.75 is the initial angular momentum, and wf is the final angular momentum. Solve for wf b) ...
*November 27, 2012*

**college algebra, Please help!!**

log(1.9)= log(a^6) log(1.9) = 6*log(a) log(a) = (log(1.9))/6
*November 27, 2012*

**calculus**

The distance from a point on the line from the origin is ((y-0)^2 + (x-0)^2)^0.5 = (x^2+y^2)^.5 = (x^2 +(x+4)^0.5) evaluate d/dx((x^2 +(x+4)^0.5)) = 0 This is the x value of the point closest to the origin, plug x into y = sqrt(x+4) to find the y value of this point
*November 27, 2012*

**physics**

I'll choose to place the piano 1/4 way from the right end Fr= force right Fl=force left Fr+Fl-W-mg=0 where mg is the weight of the beam, W is the weight of the piano (The sum of the forces in the vertical direction is zero because nothing is moving) Then sum of the torques...
*November 27, 2012*

**math**

Use the pythagorean theorem 3.75^2 + 2.84^2 = d^2, where d is the diagonal. Solve for d.
*November 21, 2012*

**Maths - HELP PLZ**

Put into your graphing calculator the equation y = 3x^2 + 10x-8 Then describe the regions of x for which the y-values are greater than 0.
*November 21, 2012*

**Physics**

v = omega/k The wave equation is of the form D(x,t) = A*sin(k*x-omega*t) k = 5.36 omega = 6.71 solve for v, the wave speed
*November 21, 2012*

**Physics**

The wavelength, lamda is 4.48 m The frequency f is 13/5.97 v = lamda*f where v is the wave speed
*November 21, 2012*

**Physics**

Use conservation of momentum: m1*v1 = m2*v2 Where m1 and v1 are the mass and speed of the initial system, m2 and v2 are the mass and speed of the final system 10*v1 = (10+3990)*50
*November 21, 2012*

**Math Functions**

f(x)= 3x+2/2x+4 graph the function horizontal and vertical asymptotes. Show the table. I found the horizontal and vertical asymptotes, but im confused on how to do a table
*November 19, 2012*

**math 104**

From a survey of 100 college students, a marketing research company found that 50 students owned iPhones, 45 owned cars, and 35 owned both cars and iPhones.
*November 18, 2012*

**physics**

After the light passes through the first Polaroid, it's intensity is 1/2Io. Now the light is polarized After the second sheet, it is now 1/2I0*((cos(59))^2) After the third sheet it is 1/2I0*((cos(59))^2)*((cos(59))^2) . . Do this up to the 6th sheet, and divide by I0
*November 16, 2012*

**Probability**

1/3 He asks three person a question, and only one of them tells the truth. The probability of getting the truthful man to answer is 1/3
*November 16, 2012*

**Physics**

y = y0 + vy*t + 1/2*ay*t^2 Where y is the distance in the vertical direction, y0 is the initial y position, vy is the speed in the y direction, ay is the acceleration in the y direction, t is time. Choose a coordinate system so that y0 equals zero at the baseball player's ...
*November 15, 2012*

**Physics**

1 decibel = A*log(P/P0) = A*log(1.122) Where P0 is the initial pressure, P is the pressure 1 decibel = 0.05*A A = 20 L = 20*log(P/P0) 8 = 20*log(P/P0) Solve for P/P0
*November 15, 2012*

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