Wednesday

May 25, 2016
Total # Posts: 2,028

**physics**

A police car, whose siren has a natural frequency of 620Hz, moves away from a wall and towards a stationary observer at a speed of 30km/h. What is the beat frequency perceived by the observer? If the observer stands between the car and the wall, what beat frequency does he ...
*October 9, 2013*

**Physics**

That answer is incorrect if in MyPearson
*October 7, 2013*

**Physics**

The coefficient of static friction between the 2.90 kg crate and the 35.0° incline of Figure P4.41 is 0.260. What minimum force F must be applied to the crate perpendicular to the incline to prevent the crate from sliding down the incline?
*October 7, 2013*

**italian**

se mangi troppi zuccheri puoi avere mal di denti.
*October 6, 2013*

**geography (ms. sue)**

why might workers be unwilling to take jobs in siberia?
*October 5, 2013*

**physics**

Car a with a mass of 1250kg is travelling at 30m/s to the east. Car b is a truck with a mass of 2000kg, travelling to the west at 25m/s. Assume these two vehicles experienc an inelastic collision but do not stick together and car a goes off 10m/s to the west what will be the ...
*October 3, 2013*

**Geometry**

Yes a is equal to b. Thanks for your help!
*October 2, 2013*

**Geometry**

But is 5a equal to 5b?
*October 2, 2013*

**Geometry**

Substitution Property of Equality: If a=20, then 5a= _____. The substitution rule states that If a=b then a can be substituted for b in any equation or expression. So I think that 5a=5b but the number answer is 100. Am I correct?
*October 2, 2013*

**chemistry**

Nope, just working in a study group. Each person asking a question. Thanks for the help. I thought about doing something like that but I was writing them with the noble gas first and that was making it difficult to see the pattern.
*September 30, 2013*

**chemistry**

Sort these elements into isoelectronic groups. Into three different boxes/sections. Elements: F- O2- Al3+ S2- Ti4+ K+ He Li+ B3+
*September 30, 2013*

**chemistry**

it says "how many joules of energy would be required to heat 29.8 grams of carbon from 25.5 C to 79.3 C. (s= .71 Joules / grams times carbon) & the formula is Q= M x C x delta T .
*September 30, 2013*

**chemistry**

it says "how many joules of energy would be required to heat 29.8 grams of carbon from 25.5 C to 79.3 C. (s= .71 Joules / grams times carbon) & the formula is Q= M x C x delta T .
*September 30, 2013*

**chemistry**

1138.3004?
*September 30, 2013*

**chemistry**

Yeah. What did you get?
*September 30, 2013*

**chemistry**

So the answer would be 1233.5 joules?
*September 30, 2013*

**chemistry**

How?
*September 30, 2013*

**chemistry**

it says "how many joules of energy would be required to heat 29.8 grams of carbon from 25.5 C to 79.3 C. (s= .71 Joules / grams times carbon) & the formula is Q= M x C x delta T .
*September 30, 2013*

**Biology**

Glucose + Fructose=__________________. I am thinking it is sucrose or table sugar but I am not sure.
*September 29, 2013*

**Math**

In a certain Library, there are r bookcases with s shelves in each book case. If a total of b books is to be distributed among the shelves, What is the number of books per shelf? a) b/rs b) rb/s c) rsb d) r/s-b e) b/s-r
*September 21, 2013*

**math**

what is 1/3 of 1/2?
*September 17, 2013*

**math**

Total invested = 10,000 X = 4500/10000 = 45% y = 3500/10000 = 35% z = 2500/10000 = 255 1500 profits equally + 500 each As percentage of investment X = 45% X 1500 = 675 675 - 500 = 175 LESS
*September 4, 2013*

**Lincoln middle**

What does it mean when # are in () for instance (12)(3)=
*September 3, 2013*

**pol 125 - American National Government **

what extent the war on terror justifies the President's indefinite detention of "enemy combatants" without the possibility of the minimal judicial review protected by habeas corpus?
*August 4, 2013*

**calculus **

Solve the DE by using the Laplace transform: x''+x=cos(3t), x(0)=x'(0)=0
*July 27, 2013*

**math**

29th september
*July 21, 2013*

**physics**

A board that is 20 cm wide, 5 cm thick, and 3 m long has a density of 350 kg/m^3. The board is floating partially submerged in water do density 100 kg/m^3. What fraction of the volume of the board is floating above water?;
*July 13, 2013*

**Elementary mechanics**

(Q1) 2 forces act on a point object as follows: 100 at 170 and 100 at 50.Find the resultant force (a)110N at 50 (b)110N at 100 (c)100N at 110 (d) 100N at 50 (Q2) given 3 vectors a=-i-4j+2k,b=3i+2j-2k,c=2i-3j+k,Calculate a-(b-c) (a)-6(b)6(d)9(d)-9 (Q3)The resultant of vectors A...
*July 12, 2013*

**Math**

(2/25 +13/25) - (2/5 - 14/15)
*July 8, 2013*

**(pls help) algebra**

4x+y-32=1, 6x-y-4z=7, 10x+2y-6z=5 pls show me how to solve for x,y,z. Ans:xx=1.5,y=-2,z=1
*July 8, 2013*

**(pls help) Trig**

point P and Q are respectively 24m north and 7m east of point R. What is bearing of Q and P to the nearest whole degree.(a)52(b)164(c)134(d)159
*July 7, 2013*

**statistics**

6. According to the records of Enersource, an electric company serving the Mississauga area, the mean electricity consumption for all households during winter is 1650 kilowatt-hours per month. Assume that the monthly electricity consumption during winter by all households in ...
*June 23, 2013*

**statistics**

The pucks used by the National Hockey League for ice hockey must weigh between 5.5 and 6.0 ounces. Suppose the weights of pucks produced at a factory are normally distributed with a mean of 5.75 ounces and a standard deviation of 0.11 ounce. What percentage of the pucks ...
*June 23, 2013*

**statistics**

Page 1 of 2 4. Despite all efforts by the quality control department, the fabric made at Benton Corporation always contains a few defects. A certain type of fabric made at this corporation contains an average of .5 defects per 500 yards. Using the Poisson formula, find the ...
*June 23, 2013*

**statistics**

3. Magnetic resonance imaging (MRI) is a process that produces internal body images using a strong magnetic field. Some patients become claustrophobic and require sedation because they are required to lie within a small, enclosed space during the MRI test. Suppose 29% of all ...
*June 23, 2013*

**statistics**

2. Bender electronics buys keyboards for its computers from another company. The keyboards are received in shipments of 100 boxes, each box containing 20 keyboards. The quality control department at Bender Electronics first randomly selects one box from each shipment and then ...
*June 23, 2013*

**Statistics**

1. Let x be the number of heads obtained in two tosses of a coin. The following table lists the probability distribution of x. x 0 1 2 P(x) .25 .50 .25 Calculate the mean and standard deviation of x. Give a brief interpretation of the value of the mean.
*June 23, 2013*

**physics PLEASE HELP!**

what are three possible thicknesses that a soap film should be to transmit yellow light ? (Lambda=590nm)
*June 15, 2013*

**Statistics**

4. An environmental agency will randomly select 4 houses from a block containing 25 houses for a radon check. a) How many total selections are possible? b) How many permutations are possible?
*June 11, 2013*

**Statistics**

3. The following table gives a two-way classification of all basketball players at a university who began their college careers between 2004 and 2008, based on gender and whether or nor they graduated. Graduated Did Not Graduate Male 126 55 Female 133 32 a) P(female or did not...
*June 11, 2013*

**Statistics**

. Two thousand randomly selected adults were asked whether or not they have ever shopped on the internet. The following table gives a two-way classification of the responses obtained. Have shopped Have never shopped Male 500 700 Female 300 500 Suppose one adult is selected at ...
*June 11, 2013*

**Statistics**

1. The mean monthly mortgage paid by all home owners in a town is $2365 with a standard deviation of $340. a) Using Chebyshev’s theorem, find at least what percentage of all home owners in this town pay a monthly mortgage of (i) $1685 to $3045 & (ii) $1345 to $3385 b) ...
*June 11, 2013*

**Accounting**

A = 500000 b = 40
*June 7, 2013*

**fundamentals**

Calculate the total constant force needed to accelerate a vehicle with mass 1400kg and tractive resistance of 320N from 19km/h to 95km/h over a distance of 0.8km on a horizontal plane.show working?
*June 5, 2013*

**fundamentals**

A playground has its highest point 2.2m above the lowest point, and the slide is 4.9m long. If the average resistance to motion is one-fifth of the weight of the child(mass 40kg), find the speed at which the child reaches the bottom show working?
*June 5, 2013*

**9/11**

What was your response to the 9/11 attacks when you first found out about it? I need to interview some people and get their answers to this question.
*June 4, 2013*

**Phyics Toughest question on earth**

Dude Can`t Understand Please Help
*June 4, 2013*

**physics**

why does it take a longer time for a kilogram of water than a kilogram of copper to reach the same temperature?
*May 29, 2013*

**Physics**

Two forces act on a 55-kg object. One force has the magnitude 65 N directed 59 clockwise from the positive x-axis, and the other has a magnitude ofm35 N at 32 clockwise from the positive y axis. What is the magnitude of acceleration?
*May 29, 2013*

**Ethics**

HIPAA, GLB, and COPPA laws can help ensure people's privacy. What is their ethical justification? Is there gray area in these laws? How do some businesses try to find their way around these laws
*May 24, 2013*

**math**

If 1/cos - cos=a^3 and 1/sin - sin=b^3 Show that tan=a/b
*May 19, 2013*

**Accounting**

B) $6; $3
*May 15, 2013*

**ethics**

ok well I'm just confused about the whole idea of "human moral predicament" and meta-ethical... I get that Nietzsche and Wittgenstein both have ways of showing what is good and bad, and they both have there reasons. But again, when it comes to the human moral ...
*May 15, 2013*

**ethics**

Both Nietzche and Wittgenstein raise the issue of the morality of morality. In other words, they ask "Why should someone be good?" Describe the different ways in which Wittgenstein and Nietzsche understand the human moral predicament i.e. the challenge of asserting ...
*May 15, 2013*

**CHEMISTRY**

how would a chemistry student make a 600 mL of 1.5 M solution of NaBr?
*May 9, 2013*

**CHEMISTRY**

how would a chemistry student make a 600 mL of 1.5 M solution of NaBr?
*May 9, 2013*

**Math**

What is the barbell method
*May 7, 2013*

**VBS 2010**

Write a Web program to calculate the discount rate and interest rate for a bond. If a bond is purchased for n dollars and sold one year later for m dollars, then the discount rate is m-2/m and the interest rate is m-n/n, where each is expressed as a percent.
*May 5, 2013*

**Chemistry**

Thank you !!
*May 1, 2013*

**Chemistry**

what is the hydronium ion concentration in a 0.55 M HNO3 solution ? what is the pH of this solution? Thank You!!!
*May 1, 2013*

**Chemistry**

what is the hydronium ion concentration in a 0.55 M HNO3 solution ? what is the pH of this solution? Thank You!!!
*May 1, 2013*

**History/English**

what does anti colonialist movements outside of america have to do with segregation?
*April 28, 2013*

**Chemistry- Acid-base titration**

The indicated endpoint of an acid-base titration seldom occurs at a ph of 7. what determines the ph of the endpoint??
*April 24, 2013*

**Algebra/Number Theory**

Solution 1: Since a2>b2+22, thus a>b. Since a and b are consecutive positive integers, we have a=b+1. Substituting in the above expression, we have (b+1)2=b2+2b+1>b2+22⇒b>22−12⇒b≥11. Thus a+b=2b+1≥2×11+1=23. Solution 2: Since a2&...
*April 24, 2013*

**math**

Well psydag how do you know that as you were typing that rude comment he wasnt typing his answers in the chat.
*April 23, 2013*

**chemistry**

A 32.0-g sample of water at 290. K is mixed with 51.0 g water at 310. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
*April 21, 2013*

**english**

so its okay is i say-- The U.S. Involvement in Vietnam From 1945-1964
*April 21, 2013*

**english**

does the word "from" get capitalized in a title?
*April 21, 2013*

**AP chemistry**

A concentration cell consists of the same re- dox couples at the anode and the cathode, with different concentrations of the ions in the respective compartments. Find the un- known concentration for the following cell. Pb(s) | Pb2+(aq, ?) || Pb2+(aq, 0.1 M) | Pb(s) Answer in ...
*April 21, 2013*

**Chemistry**

A concentration cell consists of the same re- dox couples at the anode and the cathode, with different concentrations of the ions in the respective compartments. Find the un- known concentration for the following cell. Pb(s) | Pb2+(aq, ?) || Pb2+(aq, 0.1 M) | Pb(s) Answer in ...
*April 21, 2013*

**Computer Science**

What is the fastest way to compare two strings containing only numbers. eg: "3423492349328492343.939842903482304" "349832498234932.92384924893294343" There can be at max 20 numbers before and after the decimal place. The majority will be around 20, however ...
*April 21, 2013*

**Math**

84-64cos(theta)
*April 21, 2013*

**Algebra**

A shingle falls straight down from the roof of a building that is 144 feet tall. a. Use a vertical motion model to write an equation that gives the height h of the shingle t seconds after it falls. b. When does the shingle hit the ground? c. If the same shingle were dropped ...
*April 18, 2013*

**Math**

describe how you can use the graph of y=x^2 to graph the given function. y=2x^2 + 3 y=-3/4x^2 + 5
*April 18, 2013*

**Math**

THANK YOU !!!
*April 18, 2013*

**HISTORY**

What was the third force in Vietnam?
*April 11, 2013*

**math**

Two non-negative numbers are chosen such that their sum is 30. Find the numbers if the sum of their squares is to be a maximum. Explanation to solve this would help !
*April 10, 2013*

**Life orientation**

Critical ways in wich hiv/aids problem impacts on the community and relevant sources to support
*April 10, 2013*

**history**

Why was monolithic soviet communism an important idea for the reason why US supported Diem's regime in south vietnam from 1954-64? Give 4 reasons. I already have some but i just want some more ideas for brainstorming.
*April 10, 2013*

**Pre algabra**

write 121 to 4 feet as a ratio in lowest terms
*April 9, 2013*

**Life science, history, geography, and maths literacy**

BEST THING EVER
*April 8, 2013*

**ap calculus**

oh! the function is (2-5x)^3 i got the double derivative -15(2-5x)(-5)
*April 7, 2013*

**ap calculus**

-find the coordinates for all points of inflection . find all intervals on which function has upward or downward concavity? -i found to be 2/5
*April 7, 2013*

**Math**

actually is lim x->0 (1+x)^(1/x)=e. not lim x->infinity (1+x)^(1/x)=e.
*April 6, 2013*

**Math**

Given table, X ; (1+x)^(1/x) -0.5. ; 4 -0.1 ; 2.8680 -0.01 ; 2.7320 -0.001; 2.7196 0.001 ; 2.7169 0.01 ; 2.7048 0.1 ; 2.5937 0 5 ; 2.25 From the table, show that lim x->infinity (1+x)^(1/x)=e. Plz someone show me the step how to show it based on the table. Hope u can read ...
*April 6, 2013*

**Physics**

For this problem, you are allowed to consult with other members of the class, but not with faculty and not with anyone outside the course. Simplify all your expressions. A car of mass, 2m, is going around a turn at a constant radius, R, with velocity, v0. The turn is not ...
*April 6, 2013*

**math 114**

A store mixes Kentucky bluegrass worth $11 per pound and ryegrass worth $14 per pound. The mixture is to sell for $13 per pound. Find out how much of each should be used to make a 588 pound mixture. How many pounds of the Kentucky bluegrass should be in the mixture?
*April 4, 2013*

**Algebra**

A store mixes Kentucky bluegrass worth $11 per pound and ryegrass worth $14 per pound. The mixture is to sell for $13 per pound. Find out how much of each should be used to make a 588 pound mixture. How many pounds of the Kentucky bluegrass should be in the mixture?
*April 4, 2013*

**math 6 grade**

b. 8 for $1.90
*April 1, 2013*

**grade 12 life orientation**

I NEEDS ANSWERS I AM CLUELESS
*March 30, 2013*

**Chemistry**

How many milliliters of 0.291 M HCl would be required to titrate 6.83 g KOH?
*March 27, 2013*

**Spanish**

Thank you MathMat, also is this the correct way to say, "hope to be back soon" in Spanish, "esperamos volver pronto"
*March 19, 2013*

**Spanish**

Hi there, how would I say the following phrase in Spanish: Mexico, it was beautiful. Next stop Italy.
*March 19, 2013*

**english**

paint audio
*March 14, 2013*

**Trig**

Whats the height of a flagpole if a student stand 37feet from it and determines the angle of elevation to be 34degrees and her eyes are 5.3 feet from the ground(round to the nearest whole number)
*March 11, 2013*

**Trig**

the number of solutions of sin x= -sqrt3/2 for x between 0 and 2pi
*March 11, 2013*

**Trig**

the height of a flagpole if a student stands 37 feet from it and determines the angle of elevation to be 34 degrees and her eyes are 5.3 feet from the ground.
*March 11, 2013*

**Introduction to Business Environment Chapter 2**

come on i have the answers, just wanted to check if i was correct
*March 10, 2013*

**Introduction to Business Environment Chapter 2**

The world's population is growing more slowly than expected, and there are some industrial countries in which growth might be so slow that there will be too many old people and too few young people to support them. (Points : 1) True False 2. In a free market system, price ...
*March 10, 2013*