# Posts by george

Total # Posts: 1,075

**Physics**

A ray of light with wavelength 589 nm passes through an unknown material with a velocity of 1.94 x 10^8 m/s. What is the material? I think this problem has something to do with Snell's law, but there is no given angle of refraction so I don't know how to solve it. ...

*March 25, 2017*

**Math**

Describe the cross sections formed as the plane intersects the interior of the sphere but moves away from the center

*March 15, 2017*

**Pre calc**

The population of a Midwestern city decays exponentially. If the population decreased from 900,000 to 800,000 from 2003 to 2005, what will be the population in 2008? I thought it was 7542 but it is wrong can someone please help me thank you

*March 9, 2017*

**algebra **

a ladder is placed 5ft away from a house. the ladder comes up to 12ft on the side of the house. how long is the ladder?

*February 23, 2017*

**Physics**

A piece of metal of volume 250 centimetre cube floats in water when 85 percent of its volume is under water.Calculate the upthrust on the metal. [pw=1.0gcm^-3]

*January 8, 2017*

**Linear Relations MATHS**

Thanks a lot Damon

*December 22, 2016*

**Linear Relations MATHS**

The equation of AB is : y = -13x/10 + 4/5 The equation of the perpendicular bisector of AB is: y = 10x/13 - 33/26 The distance between A and B is root(269) The Midpoint AB is (1,-0.5) Above Answers are all correct. How to find the coordinates of P?

*December 22, 2016*

**Linear Relations MATHS**

If A = (-4,6) and B = (6,-7), find: (a) the coordinates of the point P on the line segment AB such that AP:Pb = 3:1 (b) the coordinates of the point P on the line AB such that AP:AB = 3:1 and P is closer to point B than to point A

*December 22, 2016*

**Geometry**

Hi I was having some problem with this question, its been a while since I had been in geometry. I think you foil, but Im not sure. Solve for X. 2(x+4)(x+3)= 3(x+2)(x-1)

*December 11, 2016*

**precalculus**

Given: r = 4/-2-6sintheta What type of conic does this represent? ________________________________________ Circle Ellipse Hyperbola Parabola

*December 9, 2016*

**Math**

Movie starts at 5:20 it is a 1 hour and 50 minutes long. What time does the movie end?

*December 6, 2016*

**precalculus**

how do you shift y=ax^2 by (h,k)

*December 5, 2016*

**precalculus**

What does the equation y = a(x - h)2 + k, a ? 0 represent?

*December 5, 2016*

**Physics**

Two bumper cars crash head on in an elastic collision. One car #1 was moving 2.5 m/s west and car #2 was moving 3.7 m/s east. Each car has a mass of 254 kg. What are the final velocities after the collision? I think this problem is supposed to be solved with m1v1, i + m2v2, i...

*November 14, 2016*

**Physics**

Two bumper cars crash head on in an elastic collision. One car #1 was moving 2.5 m/s west and car #2 was moving 3.7 m/s east. Each car has a mass of 254 kg. What are the final velocities after the collision? I think this problem is supposed to be solved with m1v1, i + m2v2, i...

*November 13, 2016*

**geometry**

construct an isosceles triangle and construct Sierpinksi's triangle. Repeat the pattern three times. What segment of a triangle does this pattern make use of over and over again?

*November 2, 2016*

**Physics (for Damon)**

Given the following about a spring: mass = 20.0 kg height initial = 5.25 m (above the ground) height final = 2.17 m (above the ground with the mass attached) delta y initial = 0.00 m I have found the following: Spring constant: 63.7N It would take 576J to return the object to ...

*October 30, 2016*

**Physics**

Given the following about a spring: mass = 20.0 kg height initial = 5.25 m (above the ground) height final = 2.17 m (above the ground with the mass attached) delta y initial = 0.00 m There are several questions I must answer from this. 1. What is the value of the spring ...

*October 29, 2016*

**Physics**

Given the following about a spring: mass = 20.0 kg height initial = 5.25 m (above the ground) height final = 2.17 m (above the ground with the mass attached) delta y initial = 0.00 m There are several questions I must answer from this. 1. What is the value of the spring ...

*October 29, 2016*

**management**

examine the impact of one's family background and setting to work place behaviour?

*October 29, 2016*

**BUSINESS MANAGEMENT**

examine the impact of one's family background and setting to work place behaviour?

*October 28, 2016*

**principle of management**

examine the impact of one's family background and setting to work place behaviour?

*October 28, 2016*

**Maths**

1. For what values of a will the straight line y=ax+1 have ONE intersection with the parabola y=-x^2-x-8?

*October 24, 2016*

**Geometry**

The lengths of the three sides of an isosceles triangle are 24", 24", and 14". Find the measure of each length of each angle. Then find the area of the triangle.

*October 23, 2016*

**Geometry**

Once drawing the pentagon with a radius of 2, how would you figure out the side length when only knowing that the radius is 2 and when the apothem is placed it splits into a 36-60-90 triangle?

*October 23, 2016*

**Geometry**

Two buildings are separated by an alley. From a window 80 feet above the ground in one of the buildings, it can be observed that the angle of elevation to the top of the other building is 62*, and the angle of depression the the bottom of the building is 75*. Find the height, ...

*October 23, 2016*

**Physics**

If someone pushes on a box on a horizontal floor with a horizontal force of 17.8 N, but the box does not move, what is the static friction (Fs) between the box and the floor? Explain. The next question is: If the box just starts to move with a horizontal force of 29.5 N, what ...

*October 16, 2016*

**Question update 1**

In my textbook, it says Fs = -Fapplied Does this mean Fs really just equals negative 17.8 N, for the first question?

*October 16, 2016*

**Physics**

If someone pushes on a box on a horizontal floor with a horizontal force of 17.8 N, but the box does not move, what is the static friction (Fs) between the box and the floor? Explain. The next question is: If the box just starts to move with a horizontal force of 29.5 N, what ...

*October 16, 2016*

**Physics**

I am supposed to figure out if the box is moving later on in the problem set. The crate and the ramp are both wooden though. My book says the static coefficient of wood on wood is 0.4 and the kinetic coefficient of wood on wood is 0.2.

*October 16, 2016*

**Physics**

A 75.0 kg object is on an incline of 30 degrees horizontally. I have to calculate several things from this, and I need help with some of them. I have to find the following: 1. Static coefficient of friction 2. Kinetic coefficient of friction 3. Gravitational force 4. Normal ...

*October 16, 2016*

**Math**

I think 2 is b

*October 10, 2016*

**Math**

she has none = 0 juicebox

*October 10, 2016*

**English**

#1 and #5

*October 10, 2016*

**English**

yes but #5 is not grammatical

*October 10, 2016*

**math**

I think it is on the 20th of September which is Tuesday

*October 10, 2016*

**English Thesis please help**

Can someone give me an elaborate overview of what the Puritan period is about?

*October 10, 2016*

**History**

Why did the Elizabethan period end? I know that it ended with Queen Elizabeth I, but I need a more elaborate explanation of why that era ended?

*October 10, 2016*

**English**

so if a thing flies its an aircraft? If so then can you call a bird an aircraft?

*October 10, 2016*

**English**

the balloon and the helicopter can be called an aircraft but I don't know if You can call the UFO an aircraft since it is an Unidentified Flying Object

*October 10, 2016*

**Physics**

A golf ball with an initial angle of 34 degrees lands exactly 240 m down the range on a level course. a.) Neglecting air friction, what initial speed would achieve this result? b.) Using the speed determined in item a, find the maximum height reached by the ball. I was looking...

*October 5, 2016*

**Math**

If the ratio of green marbles to yellow marbles is 3:4 then how many yellow marbles are there for 8 green marbles

*October 4, 2016*

**Physics**

A train travels due east at a velocity of 85.5 km/hr. A passenger walks from the front of the train to the back at a velocity of 3.7 km/hr. What is the velocity of the passenger to an observer who is seated on a train going due west at a velocity of 64.7 km/hr? What I've ...

*October 3, 2016*

**Physics**

@Damon, just one question. Sorry, but I'm not sure where you got the 124 and 256 from.

*October 2, 2016*

**Physics**

A car heads due west on Interstate 80 going 63.0 km/hr for 2.1 hours. The car then turns and heads exactly northwest on Interstate 42 going 53 km/hr for 3.3 hours. What is the resultant displacement of the car? I've done some work on it and I have a good idea. I found the ...

*October 2, 2016*

**Physics**

A car heads due west on Interstate 80 going 63.0 km/hr for 2.1 hours. The car then turns and heads exactly northwest on Interstate 42 going 53 km/hr for 3.3 hours. What is the resultant displacement of the car?

*October 2, 2016*

**Math**

What is the difference between "Give your answer correct to two decimal places." and "Round your answers to two decimal places." ?? Are they the same thing or do the answers differ?

*September 12, 2016*

**information and technology**

c) Describe each of the computer specifications listed below i. Intel Core 2 Duo T6670 (2.2GHz,2MB L2 cache) ii. 15.6 HD Anti-Glare (1366x768) iii. 2 GB DDR3 1066 MHz 1DIMM iv. 320 GB 7200RPM v. DVD+/- RW vi. Loaded Operating system Windows 7 vii. Wireless 802.11 b/g/nm BT, ...

*September 6, 2016*

**principle of management**

whilst entrepreneurship is a panacea to the world over, the current Zimbabwean situation is different .eludicate four reasons why the situation is different

*September 3, 2016*

**Math**

week 1: $1 week 2: 2 x $1 = $2 week 3: 2 x $2 = $4 week 4: 2 x $4 = $8 week 5: 2 x $8 = $16 week 6: 2 x $16 = $32

*September 3, 2016*

**Math**

Kate's parents decided it was time to start giving her pocket money. They were not sure how much to give her so they started with $1 for the first week and doubled it every week. How many weeks until Kate gets over $20 pocket money?

*September 3, 2016*

**Economics**

Assume the total cost of production in a particular firm is #50000.00 while the fixed cost is #30000.00. The wages paid to each unit of labour is #2000.00. Calculate the unit of labour employed in this firm please what is the formula

*August 24, 2016*

**Chemistry**

How do you determine the polarity of a substance? Example?

*July 29, 2016*

**Algebra**

L=LENGHT W=WIDTH L+2w=220 L=220-2W LW=AREA A=W(L) A=W(220-2W) A=-2W^2- 2W^2 A=-2(W^2-110W+55^2-55^2) A=-2(W-55)^2+6050 W=55 L=220-55-55 =110

*July 7, 2016*

**math**

How many yards is 9000024km

*June 29, 2016*

**fin/370**

Spread the balance sheets and income statements of Lake of Egypt Marina, Inc., for 2015 and 2014. (LG3-6)

*April 23, 2016*

**chem12**

tough stuff...

*March 14, 2016*

**chem12**

2HI(g)--H2(g) + I2(g) k eq= 8.0 2.0 mol of HI are placed in a 4.0L container, and the system is allowed to reach equilibrium. Calculate the equilibrium concentration of all three gases Initial 2HI=0.5 mol/L H2= 0 I2=0 change 2HI= -2x H2= x I2=x equilibrium 2HI= 0.5-2x H2= x I2...

*March 14, 2016*

**chem12**

2HI(g)--H2(g) + I2(g) k eq= 8.0 2.0 mol of HI are placed in a 4.0L container, and the system is allowed to reach equilibrium. Calculate the equilibrium concentration of all three gases Initial 2HI=0.5 mol/L H2= 0 I2=0 change 2HI= -2x H2= x I2=x equilibrium 2HI= 0.5-2x H2= x I2...

*March 13, 2016*

**chem 12**

1.0 mol of each of the gases, CO, H20, CO2 and H2 are placed in a 2.00L container and allowed to reach equilibrium. It is found at equilibrium 0.40 mol of CO is present. Calculate the value of K eq for the system. C0(g) + H20(g)--- CO2(g) + H2(g) Intial CO= 0.5 mol/L H20= 0.5 ...

*March 13, 2016*

**chem 12**

2H2S(g)---2H2(g) + S2 delta H=220KJ k eq is 0.40 a 10.0L vessel containing 2.0 mol of H2S, 2.2 mol of H2, and 2.5 mol of S2 Calculate a trail k eq value to see whether the reaction is at equilibrium. trail k eq =(h2)^2(S2)/(H2S)^2 = (0.22)^2(0.25)/(0.2)^2 = 0.3025 therefor keq...

*March 12, 2016*

**chem 12**

for the equilibrium 2HI(g)--- H2(g) + I2 k eq = 8.0 2.0 mol of HI are placed in a 4.0 L container, and the system is allowed to reach equilibrium. Calculate the equilibrium concentration of all three gases. Inital 2HI 0.5mol/l H2 =0 I2=0 change 2HI= -2x H2=+x I2=+x equilibrium...

*March 10, 2016*

**chem 12**

2H2S(g)---2H2(g) + S2 delta H=220KJ k eq is 0.40 a 10.0L vessel containing 2.0 mol of H2S, 2.2 mol of H2, and 2.5 mol of S2 Calculate a trail k eq value to see whether the reaction is at equilibrium. trail k eq =(h2)^2(S2)/(H2S)^2 = (0.22)^2(0.25)/(0.2)^2 = 0.3025 therefor keq...

*March 9, 2016*

**chem12**

1.0 mol of each of the gases, CO, H20, CO2 and H2 are placed in a 2.00L container and allowed to reach equilibrium. It is found at equilibrium 0.40 mol of CO is present. Calculate the value of K eq for the system. C0(g) + H20(g)--- CO2(g) + H2(g) Intial CO= 0.5 mol/L H20= 0.5 ...

*March 9, 2016*

**chem12**

for the equilibrium 2HI(g)--- H2(g) + I2 k eq = 8.0 2.0 mol of HI are placed in a 4.0 L container, and the system is allowed to reach equilibrium. Calculate the equilibrium concentration of all three gases. Inital 2HI 0.5mol/l H2 =0 I2=0 change 2HI= -2x H2=+x I2=+x equilibrium...

*March 8, 2016*

**Math**

A credit card company charges 1.5% interest per month (that is 18% per year). On a balance of $1448.00, calculate this month's finance charge

*March 8, 2016*

**chem 12**

consider the following equilibrium 2NOCl(g)--- 2 NO(g) + Cl2(g) Initally 1.00 mol of NO and 1.00 mol of Cl2 are placed in a 5.00L container. Calculate the initial concentrations of NOCl, NO and Cl2 NO= 0.20 mol/L Cl2= 0.20 mol/l NOCl=0 At equilibrium it is found that the NOCl...

*March 8, 2016*

**Algebra**

If t varies inversely as the cube of z and directly as the square of r, and t=4 when z=3 and r=6, find 9. T= k (square) r/(cubed) z 4=k (square) 6/ (cubed) 3 The electrical conductance of a wire varies directly as the square of its a diameter and inversely as its length. The ...

*February 20, 2016*

**Algebra**

If t varies inversely as the cube of z and directly as the square of r, and t=4 when z=3 and r=6, find 9. T= k (square) r/(cubed) z 4=k (square) 6/ (cubed) 3 The electrical conductance of a wire varies directly as the square of its a diameter and inversely as its length. The ...

*February 20, 2016*

**Physics**

Lead spheres of masses 1.7 kg and 20.4 g whose centers are separated by 6.1 cm. Calculate the gravitational force between these spheres, treating each as a point mass located at the center of the sphere. The value of the universal gravitational constant is 6.67259 × 10...

*February 9, 2016*

**chem 12**

1.00 mol of N2O4 and 1.00 mol of NO2 are placed in an 800 mL container. Calculate the initial concentrations of each gas. N2O4= 1.25 mol/L NO2=1.25 mol/L When equilibrium is reached, the concentration of NO2 increases by 0.50mol/L. Calculate the equilibrium NO2 and N2O4 If I ...

*February 6, 2016*

**chem 12**

This is my question Into a 500mL container a chemist introduces 2.0 x 10^-2 mol of N2(g) and 2.0 x10^-2 mol of O2(g). The container is heated to 900degrees celcius and the following equilibrium is achieved. N2(g) + 2O2----N2O4(g) calculate the intial concentrations in mol/L ...

*February 3, 2016*

**physics**

8. The coefficient of static friction between a 150-kg box of medical equipment and the floor is 0.35. Would 450-N force applied horizontally be enough to cause the box to move from rest?

*January 18, 2016*

**pyshics**

8. The coefficient of static friction between a 150-kg box of medical equipment and the floor is 0.35. Would 450-N force applied horizontally be enough to cause the box to move from rest?

*January 18, 2016*

**algebra**

find the slope-intercept form for the line satisfying the following conditions: x-intercept 3, y-intercept 2/3

*December 15, 2015*

**Physics**

A roller coaster cart of mass m = 293 kg starts stationary at point A, where h1 = 23.3 m and a while later is at B, where h2 = 8.4 m. The acceleration of gravity is 9.8 m/s^2. What is the speed of the cart at B, ignoring the effect of friction?

*December 14, 2015*

**Physics Help**

A projectile is fired at an upward angle of 60 degrees with a speed of 100m/s. It lands on a plateau 150m higher. What is the projectile's speed the moment before it strikes the plateau? I'm thinking to just use the kinematic equation Vf^2= Vi^2 + 2aΔy. Am I correct?

*December 13, 2015*

**Maths**

solve this partial differentiation and find if maximum,minimum or saddle. f(x,y)=x^3-y^3+6xy...

*December 2, 2015*

**sunyani polytecnic**

Maths make x the subject from this equation: 3x^2=6y

*December 2, 2015*

**Statistic**

professor has found that the grades on a Statistics Exam are normally distributed with mean 72 and a standard deviation of 12. If only the best 15 % of the grades in the class will get an A, what grade must a student get in order to get an A?

*November 28, 2015*

**physics**

A car travelling 110 km/h [S25°W] turns to a heading of [S25°E]. What is the car's change in velocity ?

*November 24, 2015*

**U.S.history**

All of the following are true about religious displays on public property excep

*November 23, 2015*

**English**

What does this mean "the cold gleam of the fanatic" It is in the story "The Sniper" by Liam O'Flaherty

*November 18, 2015*

**math**

6000

*November 16, 2015*

**precalcus**

$30,549.39

*November 9, 2015*

**stat**

The mean of a normal probability distribution is 60; the standard deviation is 5

*November 5, 2015*

**math**

3/4

*October 13, 2015*

**Math**

Teacher said answer was $120

*October 5, 2015*

**Math**

A home owner goes to the hardware store to purchase the letters that make up a number for a sign he is making, (e.g., F-O-U-R, N-I-N-E, etc.). When he arrives, other customers are doing the same thing. The first customer buys the letters to display ONE, and pays $40. The next ...

*October 5, 2015*

**Math**

I can't figure this out! Help please! The Problem At the local park, I saw a man was quizzing a boy with some simple arithmetic problems, and the boy seemed to be getting them all correct. He asked the boy, "32 + 5", and the boy answered, "37". The man ...

*September 30, 2015*

**math**

A wall has an area of 7.2 square meter. It was painted yellow and brown. The area of the wall painted yellow was 3 times as large as the area painted brown. What was the ratio of the area painted yellow to the area painted brown?

*September 19, 2015*

**Chemistry**

Which of the following is the strongest acid? 1. HNO2 4. H2SO3 2. H2CO3 5. HFO 3. HC1O3 6. H2O I'm really stuck, I know none of these are a "strong acid." I think the strongest might be HClO3 because Cl has the highest oxidation number and it has the most amount ...

*September 9, 2015*

**Stat**

The following data are the number of persons who were waiting in line at a fast food counter at 100 randomly selected times during the week. At the 0.05 level, test whether the population of these values could be Poisson distributed. x = Number Number of of persons ...

*September 2, 2015*

**Math**

A recipe for punch calls for 4 cups on lemonade for every 6 quarts of fruit juice. How many quarts of fruit juice should elly use if she has already added 10 cups of lemonade

*August 27, 2015*

**Algebra**

In a three digit number, the hundreds digit is twice the units digit. If the digits are reversed, the new number is 396 less than the original number. Find the number.

*August 9, 2015*

**math**

To get a year's digit product, multiply the year's digits. For example, between 1900 and 2000, the 2 years 1913 and 1931 each have a digit-product of 27. What is the largest integer n for which n of the years from 1900-2000 have the same non-zero product? A. 2 B. 3 C. ...

*August 4, 2015*

**math**

If x is greater than or equal to 100, then √x+16 (the whole thing is square rooted) is between A. √x and √x+1 B. √x+1 and √x+2 C. √x+2 and √x+3 D. √x+3 and √x+4 How do I go about solving this?

*August 4, 2015*

**math**

For how many different positive integers n will n, n+2, and n+4 represent three different prime numbers? A. none B. 1 C. 2 D. 3

*August 4, 2015*

**math**

Exactly ? different pairs of integers (x,y) represent points on the circle x^2 + y^2 = 25. A. 12 B. 8 C. 6 D. 4

*August 4, 2015*

**math**

For how many different positive integers n will n, n+2, and n+4 represent three different prime numbers? A. none B. 1 C. 2 D. 3

*August 4, 2015*