Friday

April 29, 2016
Total # Posts: 2,295

**math**

Using the best-fit line below for prediction, answer the following questions: a) What would you predict the price of Product X in volume of 150 to be (approximately)? b) What would you predict the price of Product X in volume of 100 to be (approximately)?
*December 29, 2012*

**Physics **

What is the frictional force between the tires of a 2000 kg car and an asphalt road if the coefficient of friction is 1.2?
*December 20, 2012*

**Physics**

If the coefficient of kinetic friction between a 36 kg crate and the floor is 0.31, what horizontal force is required to move the crate at a constant velocity (so that FNET=0.0 N) across the floor?
*December 20, 2012*

**Physics **

What is the frictional force between the tires of a 2000 kg car and an asphalt road if the coefficient of friction is 1.2?
*December 20, 2012*

**Physics**

Look up the density of saltwater and the density of fresh water. The ship will sit higher in the liquid with greater density. The density of the water displaced times the volume of the water displaced is equal to the weight of the ship. A fluid with a greater density will ...
*December 18, 2012*

**maths**

Let the new point be (x1, y1, z1) Then, using the distance formula: ((x1-1)^2 + (y1-3)^2 + (z1-3)^2)^0.5 = 5 (x1-1)^2 + (y1-3)^2 + (z1-3)^2 = 25 Put all units in terms of one variable. I'm choosing x1 first: x1+2/3 = y1+1/2; y1 = x1 + 2/3 - 1/2 = x1 + 1/6 x1 + 2/3 = z1-3/2...
*December 18, 2012*

**math**

For the square with area 25 yd^2, x^2 = 25; x = 5; where x is the length of a side of the square. The perimeter of this square is 5*4 = 20 For the square with area 5 yd^2, y^2 = 5; y = 5^0.5; where y is the length of the side of this square. The perimeter of this square is 4*(...
*December 18, 2012*

**chemistry**

pH = -log[H+] pOH = -log[OH-] and pH = pOH = 14 pOH = -log(0.01) = 2 2 + pH = 14; pH = 12
*December 18, 2012*

**C++**

This is a perfect opportunity for you to develop the skill of reading your textbook and finding the necessary information. You will probably need to find functions that read and search data, separate data into components, and store data. Find these functions, and read through ...
*December 18, 2012*

**science**

Available is a 5 M/liter solution. You need 100 mL of a 0.91 M solution. In units of moles, you need 0.91 mol/liter * 0.1 liter = 0.091 moles of HNO3 0.091 moles / (5moles/liter) = 0.0182 liters of the 5 M solution. Take 0.0182 liters of the 5 M solution, and dilute to 100 mL...
*December 17, 2012*

**Calculus**

V = 4/3*PI*r^3 dV/dt = 12 = 4*PI*r^2*dr/dt = 4*PI*1^2*dr/dt Solve for dr/dt, the rate at which the radius is growing
*December 17, 2012*

**help math**

vboat + vcurrent = 23/3.6 vboat - vcurrent = 23/3 where vboat is the speed of the boat without a current, v is the speed of the current. The first equation models the boat traveling with the current; the second equation models the boat traveling against the current. Use ...
*December 17, 2012*

**Algebra 2**

graph the function on your graphing calculator. The domain is the set of x values for which the function is defined; the range is the set of y values. Look at the graph and determine the set.
*December 17, 2012*

**physics**

deltaQ = 0; where Q = m*C*T m is the mass, C is the specific heat, T is the temperature 608*C*(Tf-77) + 429*C*(Tf-23) = 0 Where Tf is the final temperature Solve for Tf
*December 17, 2012*

**Calculus**

The boundaries for phi are 0 to 2*PI The boundaries for theta are 0 to PI
*December 16, 2012*

**physics**

Q = m*C*(Tf-Ti) where Q is the heat, m is the mass of the substance, C is the specific heat, Tf is the final temperature; Ti is the initial temperature. deltaQ = 0 or 5*C(Tf - 10) + 1*C*(Tf - 40) = 0 divide by C: 5*(Tf-10) + (Tf-40) = 0 Solve for Tf.
*December 16, 2012*

**statistics**

a) 160 males answered the survey; and 110/160 = 68.75% preferred the current schedule. 140 females answered the survey, and only 50/140 = 35.71% preferred the current schedule, and 90/140 preferred the flex schedule b) One way of describing the preferences is that males are ...
*December 16, 2012*

**physics**

angular momentum of a hoop is m*r^2; the angular momentum of a solid cylinder is 1/2*m*r^2; the angular momentum of a solid sphere is 2/5*m*r^2; the Angular momentum of a hollow spherical shell is 2/3*m*r^2
*December 15, 2012*

**physics**

Volume of air in the balloon = V =(4/3)*PI*r^3 = (4/3)*PI*0.5^3 mass of air displaced is 1.29 * V mass of helium is 0.181*V Upward force due to pressure difference between helium and air is (1.29 - 0.181)*V Sum of forces in the y direction is 0: (1.29 - 0.181)*V - T - 0.0120...
*December 15, 2012*

**Physics**

F = -k*x where F = force, x is displacement 70.4 = -k*0.0535
*December 14, 2012*

**physics**

F*x = 1/2*m*v^2 where F is the average force, x is the distance over which the bullet is accelerated, v is the speed, m is the mass of the bullet F*0.432 = 1/2*22*907^2
*December 14, 2012*

**Physics**

Power = F*v where F is the force, v is the speed 53.3 = F * (1.32m/1.22s)
*December 14, 2012*

**Math**

Evaluate each of these answers: For example, evaluate A. (-1/2)^4 + 7*(1/2)^2 - 9*(1/2) -1 and 0^4 + 7*0^2 - 9*0 -1 If one of these answers is negative and one of these is positive, then the Intermediate Value Theorem guarantees taht the polynomial has a root in this interval...
*December 14, 2012*

**Algebra 1- Math**

a. At the start, months = 0; employees = 2. In 6 months, months = 6; employees =14 (0,2) (6,14) b and c. 2 employees/month is the slope This is how many employees the company would have to add per month to get 14 employees at the end of 6 months E = 2 + r*m where E is the ...
*December 14, 2012*

**Chemistry**

MnO4−(aq) + SO32−(aq) + H+(aq) → Mn2+(aq) + SO42−(aq) + H2O(l) in the form a*MnO4−(aq) + b*SO32−(aq) + c*H+(aq) → d*Mn2+(aq) + e*SO42−(aq) + f*H2O(l) Start by counting how many of each are on each side. I'm going to choose to...
*December 14, 2012*

**Algebra 2**

B = P*e^(Yr) where B is balance, P is principle = 1600; e is the number e; Y is the number of years; and r is the rate 0.079 Plug these numbers in and solve for the answer.
*December 14, 2012*

**physics**

Start the person at (0,0), and calculate the new position after each path. After path 1: (80,0) After path 2: (80, -250) After path 3: x displacement is -130*cos30; y displacement is -130*sin30 (80 - 130*cos30, -250 -130*sin30) After path 4: x displacement is -190*cos30, y ...
*December 13, 2012*

**math**

How many squares are on each side? x*y = 49 where x the number of squares for the width, and y is the number of squares for the length. 120000 = X*Y where X is the width in feet, Y is the length in feet 120000/49 = (X/x) * (Y/y) You have X/x = Y/y
*December 13, 2012*

**Math help give example**

Third degree means that it has one term to the power of three. One example: x^3 + x^2 + x + 1
*December 13, 2012*

**business**

Look up how the vehicle should be serviced -- i.e., checkup every 5000 miles? etc. Determine the best method of doing so--consider all options available, such as hiring one person to do the job, scheduling periodic checkups at a repair shop, etc.
*December 13, 2012*

**Math help storie problem**

let g be the price of green peppers and r be the price of red peppers. 3*g + 2*r = 3.45 4*g + 3*r = 5.00 Use algebra to solve for g and r
*December 13, 2012*

**calculus**

The derivative of sinh(x) is cosh(x), and the derivative of cosh(x) is sinh(x) So the nth derivative of sinh(x) is cosh(x) if n is odd; and the nth derivative of sinh(x) is sin(x) if n is even The nth derivative of cosh(x) is sinh(x) if n is odd; and the nth derivative of cosh...
*December 12, 2012*

**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*