Thursday
December 18, 2014

Posts by tom


Total # Posts: 1,118

physics
a student tries to open a door at a distance of 1 cm from the hinge at a distance of 10 cm from the hinge and at a distance of 50 cm from the hinge why is a larger force required at 1 cm than at 50 cm?
July 23, 2011

telemarketing
A telemarketer with B2B Communications has a 20 percent historical probability of making a sale during a shift where 100 calls were made. Assign a random variable x, where the value of x is equal to the number of sales made during the shift. Describe the probability ...
July 23, 2011

statistic
The average score on a standardized test is 750 points with a standard deviation of 50 points. If 2,000 students take the test at a local school, how many students do you expect to score between 700 and 800 points?
July 21, 2011

statistics
The average score on a standardized test is 500 points with a standard deviation of 50 points. What is the probability that a student scores between 450 and 600 on the standardized test?
July 21, 2011

accounting
A company has an overhead application rate of 125% of direct labor costs. How much overhead would be allocated to a job if it required total direct labor cost of $20,000? $5,000. $16,000. $25,000. $125,000. $250,000. The R&R Company's production costs for August are: ...
July 16, 2011

geometry
The diagonals of rhombus FGHJ intersect at point K. If side GH is equal to 3x - 10 and side JH is equal to 6x - 19, find x.
July 14, 2011

English
Does anyone know what this verse means: "shall summon to unwelcome bed"? Here is the full stanza of the poem. It is from through the looking glass? Come, hearken then, ere voice of dread, With bitter tidings laden, Shall summon to unwelcome bed A melancholy maiden! ...
July 11, 2011

Algebra
It is possible for a quadratic equation to have no real-number solutions:Solve : x2 + 5x + 3 = 0
July 10, 2011

algebra 2
If Q varies inversely as the square root of R and Q=2 when R=4, what is Q when R is 25? does Q=625 im not sure can someone double check it for me.
July 8, 2011

algrebra 2
can someone please help me im stumped on these two. use analytical methods to solve the equation. 1+(1/x)=(42/x²) (7/x-4)=1+(9/x+4)
July 8, 2011

algebra
Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this. 4x + 4y = -36 4x + 4y = 12
July 6, 2011

Chemistry
For the reaction HNO3+HCl=NO2Cl+H20 What is the equilibrium constant at 25 C and 75 C
July 1, 2011

trig
sinx+sinxcot^2x=cscx prove each identity
June 24, 2011

trig
tan(theta)-1= sin^2(theta)-cos^2(theta)/ sin(theta)cos(theta)+cos^2(theta) prove each identity
June 24, 2011

chemistry
what is the volume of 4.4 moles of Cl2 at 285 kelvin and 0.87 atm. (R=0.0821 k*atm/mol*k)
June 15, 2011

Math
3(x-2)+4(2x-6)=6(x-4)+8(2x+1)x=
June 11, 2011

Math
What is the square root of 6 times the square root of 9 if there is no perfect square of 6
May 23, 2011

english
1890-1950 American MLA Format
May 15, 2011

english
I need to write a mini research paper on a modernist poet of my choice... I'm having trouble deciding on what poet to use and how i can develop a strong thesis.. any help would be much appreciated.
May 15, 2011

american government
The factor that normally has the most impact on the president's level of popular support is a. world conditions. b. the condition of the nation's economy. c. the national crime rate.d. the president's skill in the use of television. e. the condition of nation's...
May 13, 2011

Statistics
Suppose that the average grade for all people who take this course in statistics is 83 with a standard deviation of 3.5. If your particular class has an average of 89, can you conclude that your class is better than average at the 90 percent confidence level? Label and ...
May 13, 2011

physics
The function y(x, t) = (25.0 cm) cos(ðx - 15ðt), with x in meters and t in seconds, describes a wave on a taut string. What is the transverse speed for a point on the string at an instant when that point has the displacement y = +22.0 cm?
May 13, 2011

Chemistry
so if the pka is 4.5 the range will be from 3.5 to 5.5?
May 12, 2011

Chemistry
what is the pH range of the buffering region? is that when ph=pKa?
May 12, 2011

government
the federalist papers were written to what? win support for the constitution in new york expose the lack of civil liberties protected in the constitution urge ratification of the constitution in virginia condemn the constitution for the absence of any metioned god
May 11, 2011

UCI Chemistry Webworks
For the following balanced equation: 2 Ag+ (aq) + Cu(s) <<->> Cu2+ (aq) + 2 Ag(s) Which letter corresponds to the correct cell notation at standard state conditions? A. 2Ag+(aq) | Cu2+(aq) || 2Ag(s) | Cu(s) B. Cu(s)| Cu2+(aq) || Ag+(aq) | Ag(s) C. Ag+(aq) | Cu2+(aq...
May 7, 2011

account/check please
answer is A
May 4, 2011

math
do you know how to solve it
May 4, 2011

math
Male: 60,63,65,70,66,80,85,73,79,80,83,85,81,76, 77,90,91,88,78,92 Females: 62,69,70,72,78,77,79,83,80,88,90,90,98,100, 66,67,65,63,69, 83 Can you hellp me I need to find: A) P value and the Z value of this data with a Alpha Value of 0.05.
May 4, 2011

MATH Please help me
Male: 60,63,65,70,66,80,85,73,79,80,83,85,81,76, 77,90,91,88,78,92 Females: 62,69,70,72,78,77,79,83,80,88,90,90,98,100, 66,67,65,63,69, 83 Can you hellp me I need to find: A) P value and the Z value of this data with a Alpha Value of 0.05.
May 4, 2011

Math (stastiscs)
Male: 60,63,65,70,66,80,85,73,79,80,83,85,81,76, 77,90,91,88,78,92 Females: 62,69,70,72,78,77,79,83,80,88,90,90,98,100, 66,67,65,63,69, 83 Can you hellp me I need to find: A) P value and the Z value of this data with a Alpha Value of 0.05.
May 4, 2011

Math
A lawn service will fertilize a lawn at at a rate of 59cents per 100 square feet. What is the price they will charge to fertilize a 125foot x 140foot rectangular lawn? Express answer to the nearest cent.
May 1, 2011

math
1/9
April 29, 2011

physics
Stan raises a 1110 N piano a distance of 5.00 m using a set of pulleys. Stan pulls in 20.0 m of rope.
April 27, 2011

statistics
If you have a population mean of 50 and a population standard deviation of 5 and you select a sample size of 100, what is the probability that the sample mean is between 47 and 49.5?
April 27, 2011

math
how do I determine the compounding rate required to turn $350 into $14,000 over 30 years? Thank you
April 26, 2011

physics
DONT KNOW CAUSE THERE IS NO FORMULA FOR IT
April 24, 2011

Chemistry
Magnesium is found in the ore,magnesite, MgCO3. The ore decomposes when heated to form magnesium oxide and carbon dioxide. Write the balanced equation for this reaction.
April 24, 2011

chemistry
What is the pH of a solution made by adding grams of NH4Cl, to 550 mL of 0.205 M NaOH?
April 20, 2011

math
can some one help 3>4+5+
April 19, 2011

substition algebra
solve x & y: 3X-6Y(-6X+34)=30
April 19, 2011

Math
Sean's mom was 27 years old when he was born. When Sean is 14 years old his mother's age will contain the same two digits as Sean's age. The next time that Sean's age and his mother's age contain the same 2 digits ____ years later.
April 19, 2011

Math
Today Justin reached 1/11 the age of his mother was when he was bron. Today, Justin's mother is _____ times as old as Justin.
April 19, 2011

Math
find the derivative f(x)= 4xe^x f(x) = ln (2z-11)^7 f(x) = ln (x-1/3x+1)
April 17, 2011

chemistry
. Given the following stocks 4M NaCl, 3M NaOH, 5M HCl (a) Prepare 200ml of a solution containing 0.5M NaCl and 0.1M (b) Prepare 300ml of a solution containing 0.5M NaCl (c) Prepare 200ml of a solution containing 0.5M NaCl and 0.1M HCl
April 15, 2011

algebra
Tad was delivering lunch to a local office building. His first delivery was to the middle floor of the building. He then took th elevator up 4 floors for the next delivery, down 6 floors for his third delivery, and up 7 floors for his final delivery. He was then on the top ...
April 14, 2011

physics
At the equator, the earth’s field is essentially horizontal; near the north pole, it is nearly vertical. In between, the angle varies. As you move farther north, the dip angle, the angle of the earth’s field below horizontal, steadily increases. Green turtles seem to...
April 14, 2011

Fractions
Add the following. 1/2+3/12+1/4; 3/12+1/2+1/4;5/6+1/3;1/4+3/8+1/4
April 13, 2011

Fractions
Crate has 24 pieces of fruit . 1/2 are oranges, 1/4 are mangos and 2/8 are pineapples. Howmany oranges are there, how many mnagos and how many pineapples? Al ate 1/8 of a sandwich,Bob ate 1/8, then Bill ate 1/4. How much did they eat all together? What fraction was left. 24 ...
April 13, 2011

Fractions
24 students. 2/3 have brown hair, the rest blond hair. How many students have brown hair. What fraction of the students have blonde hair and how many students is that?
April 12, 2011

Fractions
Actually the question was wrong> 24 pieces of fruit. 1/2 are oranges, 1/4 are mangos, and 2/8 are pineapples. How many oranges, how many mangos and how many pineapples are there?
April 12, 2011

Fractions
Ms.Perez has a crate of 24 pieces of fruit. 1/2 are oranges, 1/4 are mangos, and 2/3 are pineapples. How many or oranges? How many or mangos? How many are pineapples?
April 12, 2011

math
stacy multiplied 5x9 and said the answer was 44. what two patterns could you use to show that her answer is not correct?
April 5, 2011

math
Shawna thinks that 8x2=17. what number pattern shows that she not correct?
April 5, 2011

math
Select a variable (mean, proportion, variance or standard deviation) of interest to you and collect data consisting of at least 30 values. Define the variable. Define the population. Describe how the sample was selected. Use Microsoft Excel (and MegaStat if at all possible) to...
April 4, 2011

Physics
A radioactive nucleus is at rest when it spontaneously decays by emitting an electron and neutrino (as shown in the figure below ). The momentum of the electron is 8.11 x 10−19 kg·m/s and it is directed at right angles to that of the neutrino. The neutrino's ...
March 28, 2011

Physics
A radioactive nucleus is at rest when it spontaneously decays by emitting an electron and neutrino (as shown in the figure below ). The momentum of the electron is 8.11 x 10−19 kg·m/s and it is directed at right angles to that of the neutrino. The neutrino's ...
March 27, 2011

Physics
A radioactive nucleus is at rest when it spontaneously decays by emitting an electron and neutrino (as shown in the figure below ). The momentum of the electron is 8.11 x 10−19 kg·m/s and it is directed at right angles to that of the neutrino. The neutrino's ...
March 27, 2011

Calculator help
i have a ti 83, and i want to plug this equation r=1+cos(theta)( this is polar coordinates) into my calculator but the graph does not look right. i think i messed around with the windows or table set menu and i cant fix it. can someone tell me what numbers i should put in my ...
March 26, 2011

Physics -- Help!!
If you launch a ball precisely 8' vertically how long does it take to go from the ground to 8' and back to the ground? If you then launch the same ball precisely 10' vertically, how much longer will it take to return to the ground?
March 24, 2011

Physics
I launch a ball vertically precisely 8' in the air. Then I launch a ball vertically 10' in the air. How much longer will it take the ball to travel 10' versus 8'? Put differently, how much more time does it take the ball to go the 2' further (travelling up ...
March 24, 2011

Physics
When mass M is at the position shown, it is sliding down the inclined part of a slide at a speed of 1.89 m/s. The mass stops a distance S2 = 2.1 m along the level part of the slide. The distance S1 = 1.18 m and the angle θ = 35.10°. Calculate the coefficient of ...
March 24, 2011

Math
If a player makes an average of 60% of his free throw attempts, what is the probability he will make both shots of a one-and-one (to have an opportunity to shoot a second free throw he must make the first)?
March 24, 2011

calc
find the arc length of f(x)=x^2/2
March 15, 2011

chemistry
what is the molarity if 0.5 grams of sodium chloride is dissolved to make 0.05 mL of solution?
March 14, 2011

unit circle
how does the direction ( clockwise or counterclockwise effect the values of the unit circle? what does it mean?
March 12, 2011

physics
A car is driven east for a distance of 49 km, then north for 21 km, and then in a direction 30° east of north for 27 km. Determine (a) the magnitude (in km) of the car's total displacement from its starting point and (b) the angle (from east) of the car's total ...
March 10, 2011

English
Explain why rhythm and rhyme are used in epic poetry.
March 10, 2011

algebra
Given that XY =21 and 1 < x < 2, find the sum of the upper and lower bounds of Y. Express your answer as a decimal.
February 27, 2011

trig
if cos(pi/4) is sqrt2/2 i thought sec(pi/4) is 2/sqrt 2,but its just sqrt 2 . can some one please explain.
February 27, 2011

Algebra
The five-digit number 31d26 ----- is divisible by 3. Find the sum of all possible values of d.
February 27, 2011

algebra
Find the number of square units in the area of the region in the first quadrant which is bounded by x = 4, the y-axis, y = 2, and y = 8.
February 27, 2011

CALC
INTEGRAL OF Y^2/(25+Y^2)
February 26, 2011

world history
How did the Renaissance contribute to the Age of Exploration? by emphasizing the importance of converting people to Christianity by awakening a spirit of discovery and innovation in Europe by fostering a belief in the importance of working as a group by persuading Europeans ...
February 21, 2011

calc
find integral using table of integrals ) integral sin^4xdx this the formula i used integral sin^n xdx =-1/n sin^n-1xcosx +n-1/n integral sin^n-2 using the formula this is what i got: integral sin^4xdx=-1/4sin^3xcosx+3/4 integral sin^2xdx= -1/2sinxcosx+1/2 integral 1 dx can ...
February 20, 2011

algebra
a speaker was so boring that one-half of the audience left after a few minutes. Five minutes later, one-third of the remaing audience left. Ten minutes later, one-fourth of those remaining left, leaving only nine people in the audience. How many people were in the audience at ...
February 19, 2011

geometry
The road rose at an 8 degree angle, what is the grade?
February 15, 2011

math
A peddler is taking eggs to the market to sell. The eggs are in a cart that holds up to 500 eggs. If the eggs are removed from the cart 2,3,4,5, or 6 at a time, one egg is always left over. If the eggs are removed 7 at time, no eggs are left over. How many eggs are in the cart?
February 14, 2011

Symbolic Logic
1) Give a general proof to show that for all sentences X and Y and for every consistent set Σ of sentences, if X and Y are logical consequences of Σ, then the set {X, Y} is consistent. 2) Let C be a logical consequence of the set {P1, P2, P3} and of the set {P1, P2, ...
February 12, 2011

chemistry
at 25˚c the density of water is 0.997g/cm³,the density of ice at -10˚c is 0.917g/cm³. if a soda can volume is 240 ml is filled then frozen at -10˚c, what volume does solid occupy?
February 1, 2011

Algebra
What system of equations do I use to solve the following question? A boat traveled 336 miles downstream and back. THe trip downstream took 12 hours. THe trio back took 13 hours. What is the speed of the boat in still water What is speed of the current?
January 31, 2011

math
first find the common denominator of 6 so you get 2/6 + 5/6 then you add straight across to get 7/6 over 2/5. when you divide the fractions, take the denominator and flip it to then multiply straight across so, you have 7/6 * 5/2 = 35/12
January 31, 2011

Manufacturing
Discuss how it is possible that schools put up barriers to enrolling a child with emotional disabilities
January 30, 2011

Statistics
Given a mean of 60 and a standard divation of 7, what proportion of scores is between 45 and 78? What is the formula for determining this proportion?
January 27, 2011

Statistics
Given a mean of 60 and a standard divation of 7, what percentate of scores ae 73 or less? What is the formula for determining this value?
January 27, 2011

Algebra
Lee took a survey for the school newspaper and received the following data about the number of hours classmates studied per week: (1,2,4,5,6,8,9,10,10). Express as a common fraction the positive difference between tthe median and mean of this set of data.
January 26, 2011

trig
a plane is flying at an altitude of x with the distance at 800 meters with an angle of 70 degress. what equation would you use to solve. tan70= x/800 tan70= 800/x sin70= x/800
January 26, 2011

chemestry
an oilo slick 110 nm 1.0 * 10^6 square meters of ocean.How many liters of oil are in the slick
January 24, 2011

com/155
five sentences about the role of education in successful financial planning
January 23, 2011

Chemistry
CH3COOH + H2O = CH3COO- + H3O+ Acid acetic is a weak acid so not all of it will dissociate. The constant for acid acetic is 1.8 . 10^-5 therefore 1.8x10^-5=(x^2)/(0.2-x) x is the amount that disociated solve the equation and x is 1.88x10^-3 pH=-log(pH)=-log(1.88x10^-3)=2.72
January 23, 2011

Physics
A laser emitting at 632.8nm illuminates a double slit. A screen is positioned 2.00 m from the slits. Interference fringes are observed with a separation of 1.0 cm. (a) Determine the separation of the slits. (b) Determine the angle of the first-order dark fringes.
January 16, 2011

social studies 20-1 (URGENT)
thats the thing i do not know what these sources mean and how they relate to nationalism. if smeone explains them to me then i can do the rest myself.
January 13, 2011

social studies 20-1 (URGENT)
examine each source below and write in paragraph form, a response in which you: -interpret each source to identify and explain the perspective(s) related to Nationalism. -identify and discuss one or more ideological concepts that are refleted in the sources. -Use your knowlage...
January 13, 2011

Math
you are 70 meters from train and road crossing with the train going 60meters per second, after 4 seconds has fast is the train traveling away from you?
January 8, 2011

calc
A kite 100 ft above the ground moves horizontally at a speed of 8 ft/s. At what rate is the angle of elevation between the string and the horizontal decreasing when 200 ft of string have been let out?
January 2, 2011

chem100-1
Can eletrolysis be used to separate salt in the sea int o elemental sodium and clorine gas -- somthing like 2NaCl --> 2Na + Cl2 ?
December 28, 2010

economics
"The Fed should simply increase the money supply at the same rate that the full employment economy grows, and the government should desist from any stabilizing urges." What school of thought would make this suggestion, and how do economists of that school justify ...
December 20, 2010

physics
A car of mass 1979 kg drives over a semicircular hilltop of radius 12.6 m and through a semicircular valley of radius 17.2 m with a constant velocity of 7.28 m/s. What is the normal force on the car at the bottom of the valley? would i use the equation mv^2/r +mg ?
December 19, 2010

algebra
two runners jog around an oval path at constant rates, but in opposite direstions. one runner completes a lap every 10 minutes, and the other does a lap every 12 minutes. how many minutes elapse between consecutive meetings of the runners? express answer as a mixed number.
December 16, 2010

physics
if you exert a force of 500 N to walk 4 m up a flight of stairs in 4 s, how much
December 15, 2010

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | Next>>

Search
Members