Thursday
April 24, 2014

Posts by jason


Total # Posts: 1,062

Math
There is quite the easy shortcut for adding any set of numbers from 1 to whatever and that is this: (n(n+1))/2 So, let's say you wanted to find the sum of all numbers from 1 to 99. 99 will be n and so the equation will look like the following: (99(99+1))/2 Solve for the to...

IPC
You should approach this problem by gathering all of the information that is relevant to answering the question. The question is: Will the student make it to class in 5 seconds? What is needed to answer this question? Velocity of the student, and distance to the class room. Th...

chemistry
Molality id defined as (moles of a solute)/(kg of solvent). So the concentration of Ca in the river water would be (13.4 mg/kg) * (1/1000 g/mg) * (1/40.078 mol/g) = 3.34 x 10^-4 mol/kg The key to solving any concentration problem is knowing what units you're starting with ...

college biology
If someone has abnormally low cholesterol levels then perhaps it is being consumed by processes that need cholesterol faster than it is being synthesized or brought in through the diet. Perhaps excess bile production, inability to use dietary cholesterol, excess steroid produc...

Chemistry
A solution is made by dissolving 1.0 mole of Na2SO4(ionic compound) into water to get 1.0L of solution. Give the conc of all the ions present in solution in M?

Math
1. x/4 + 11 = -25 2. x/4 - 5 = 13 3. x/4 = 13

chems
A cubic piece of metal measures 7.50cm on each edge. If the metal is nickel, whose density is 8.90 {\rm g/cm}^3, what is the mass of the cube?

algebra
Briana's second test score was 8 points higher than her first score. Her third score was 88. She had a B average (between 80 and 89 inclusive) for three tests. What can you conclude about her first test score?

Chemistry
How do I calculated the mass and moles of nitric acids when only given 2ml of concentrate nitric acid

Math
The half-life of radioactive strontium-90 is approximately 28 years. In 1962, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it take until only 6 percent of the original...

physics
A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.7 m/s. The car is a distance d away. The bear is 27 m behind the tourist and running at 6.0 m/s. The tourist reaches the car safely. What is the maximum possible value for d?

physics
What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 6.8 m/s when going down a slope for 2.5 s?

Physics
A block of mass m 1 sits at rest on a table over a hole in the table. From below the table, a bullet of mass m 2 is fired vertically upwards into the block. The bullet imbeds itself in the block. The block and bullet rise to a maximum height h. What is the bullet’s initia...

Differential Equations
Solve the differential equation below with initial conditions. Compute the first 6 coefficient. Find the general pattern. (1-x)y"-y'+xy=0 y(0)=1, y'(0)=1

Math
Find the balance in the account. $2,500 principal earning 4%, compounded quarterly, after 4 years

Chemistry
You mix 19.5 gallons of a mixture containing 12 wt% NaCl (sol'n density = 1.0837 g/cm^3) with V2-gallon sol'n that is 20 wt% NaCl (sol'n density = 1.1453 g/cm^3). Needed mixture is 19 wt% NaCl Whats the V2 in gallons? (all solutions are in water so just dealing wit...

chemistry
How many milliliters of 0.237 M HCl are needed to react with 52.2g of CaCO3? 2HCl(aq) + CaCO3(s) --> CaCl2(aq) + CO2(g) + H2O(l)

math
five rental cars require four new tires. the price of one new tire is $84. what would be the total cost including 7% tax for new tires for all five cars?

math
what is the simple interest of $1500.00 for 4 months at 63/4% annual interest?

math
4(2x + 3x)=30, solve for x

math
a parking lot charges 1.50 for the first hour of parking and 55 cents for each additional half hour. How much would it cost to park a car from 12:45 pm to 6:15 pm

math
If a contractor pays an average wage of $20.00 per hour and wants to make a 15% mark-up on the cost of labour, what will the contractor charge as an average labour cost on contracts?

math
A rectangular school yard 280 m by 245 m is to be fenced. How many metres of fencing will be required to fence it completely?

Physics calculus based
Consider the Sun to be at the origin of an xy-coordinate system. A telescope spots an asteroid in the xy-plane at a position given by (x, y) with a velocity given by (vx, vy). [DATA: (x, y) = (3.3, 5.2) ×10^11 m; (vx, vy) = (-6.1, -4.0) ×10^3 m/s.] (A) What will th...

Physics HELP
An ultrasound transducer used to measure the speed of blood cells is oriented at an angle of 45 degrees to the direction of the blood flow. if the frequency of the sound emitted by the transducer is 1.5 Mhz and the doppler shift is 268Hz, calculate the speed of blood cells. Ta...

Math (Probability)
Hassan has a bag which contains 20 coloured discs. He randomly chose three discs from the bag and found that two were red and one was white. a) Based on this sample, how many of each coloured disc are in the bag? b) Hassan returned the three discs to the bag and then randomly ...

Physics
A tungsten target is struck by electrons that have been accelerated from rest through a 38.9-kV potential difference. Find the shortest wavelength of the radiation emitted.

business
Most are wrong.

math
I wanna say 433 seats? but idk if i did that correctly...?

math
another type of percents im havin trouble with, i know im close to figuring it out but cant quite get there... "there were 130 people in a school auditorium to listen to a political candidate. This reprsents 33 1/3% of the capacity of the auditorium. How many seats are in...

math
how did u turn 33 1/3% into decimal? and how would I solve 0.3333333x = 130? And i rly do appreciate the help, have a huge test in the morning

math
another type of percents im havin trouble with, i know im close to figuring it out but cant quite get there... "there were 130 people in a school auditorium to listen to a political candidate. This reprsents 33 1/3% of the capacity of the auditorium. How many seats are in...

math
Thanks :D i knew it was 30, just wasn't sure how to get to the answer :D

math
Lois got 27 problems right on a math test. If this is 90% of the test, how many problems were on the test?

math
On a loan of $3,500, Manny had to pay $280 interest. The Interest was what percent of Manny's loan?

Math
Mr Gopal left 3/10 of his fortune to his wife. Of the remainder, 1/10 was donated to charity and the rest was distributed among his 4 children , A , B , C and D in the ratio of 4:3:3:2 . If $63000 was given to charity, calculate (a)the amount received by A (b)the total fortune...

Physics
When light of wavelength 391 nm falls on a potassium surface, electrons are emitted that have a maximum kinetic energy of 1.72 eV. 1) What is the cutoff wavelength of potassium? Answer in units of nm 2)What is the threshold frequency for potassium? Answer in units of Hz ...

Algebra 2
Evaluate little 9 C little 9

english
Yeah, I've googled for ideas already, but most of them are the same controversial topics.

english
What is a good non-controversial topic for a senior research powerpoint? I need to do a research presentation answering a question (thesis). The rules are pretty lenient, so it can be about almost anything but there must be citations from books and articles. It can be somethin...

PHYSICS Help please!!
The two-mile linear accelerator at Stanford University in California "appears" to be less than a meter long to the electrons that travel in it. Explain.

chemistry
how much heat is needed to convert 30 g of water at 10 C to 110 C

math
Expand as a binomial series and simplify (2x + y^3)^5

math
Simplify the following expression 8!/4!

physics
That makes so much more sense! Thanks so much!!!

physics
It was wrong and I still dont get how to do it!

physics
Using the Bohr model, estimate the wavelength ë of the Ká characteristic X-ray for a metal an atom of which contains Z = 50 protons.

physics help!
Using the Bohr model, estimate the wavelength ë of the Ká characteristic X-ray for a metal an atom of which contains Z = 50 protons.

physics
The Kâ characteristic X-ray line for tungsten has a wavelength of 1.94 10-11 m. What is the difference in energy between the two energy levels that give rise to this line? Express this in each of the following units. (a) joules (b) electron volts

physics
A particle has a de Broglie wavelength of 3.30 10-10 m. Then its kinetic energy quadruples. What is the particle's new de Broglie wavelength, assuming that relativistic effects can be ignored?

physics
The Kâ characteristic X-ray line for tungsten has a wavelength of 1.94 10-11 m. What is the difference in energy between the two energy levels that give rise to this line? Express this in each of the following units. (a) joules (b) electron volts

Calculus, Related Rates
A particle at point A is 50 mm away from a second particle at point B. The first particle is moving toward point B at a constant rate and the second particle is moving at a right angle to the line AB at a rate that is 1/3 of the rate of the first particle. The particles get cl...

Statistics
A private medical clinic wants to estimate the true mean annual income of its patients. The clinic needs to be within $100 of the true mean. The clinic estimates that the true population standard deviation is around $2,100. If the confidence level is 95%, find the required sam...

Lab Math/Statistics
The 95% confidence interval for a quality control specimen is 9.2-10.2 mg/dl. My question is, how do I figure out the coefficient of variation (%CV) with only this information?

Math
How would I determine if a set of numbers if Gaussian or non Gaussian?

Phys
What is the speed of a wave whose frequency is 9.00Hz and wavelength is 0.654 m?

crjs101
how to present the processing requirements and the mandated pretrial measures required by law.

physics
Some hydrogen occupies 120 ft at 60.0°F. Find the temperature when its volume is 132ft^3 if the pressure remains constant.

chemistry
Bill prepared 5.00-mL of borax solution at 59.2degrees C. He diluted the solution in an Erlenmeyer flask and titrated it to an endpoint with 27.05 mL of 0.500 M HCl. What is the saturation concentration of borate ions? I don't know what to do here. Does it involve a Ksp? T...

Math
Given P(x) = x^3 - 3x^2 - 5x + 10 a evaluate P9x) for each integer value of x from -3 through 5 b. Find all zeros of P(x) d. Prove that 5 is an upper bound on the zeros of P(x)

Algebra
solve: (1/(x-10)+(1/20)=(1/(20(x^2-100))

Algebra
((k^2+6k+9)/(k^2+12k+27))×(k^2+9)/((k^2+12k+27)) express in lowest terms

Interediate algebra
if f varies jointly as q^2 and h, and if f = 72 when q = 3 and h = 4, find h when f = 48 and q = 2

Government
In which type of colony did strict governors anger the colonists?

english
k and what about the others?

english
alright and 4) the infinitive phrase is a adverb?

english
the infinitive phrase in number 5)a noun?

english
i don't know how to identify the infinitive phase

english
what is the function of the italicized infinitive phrase in these sentences? 1)May I have permission to use the car tonight? 2)He went to Europe to study architecture. 3)Can you give me a place to put my things? 4)I want to go with you to the store. 5)To help you is my greates...

english
k

english
cause i don't know this stuff that much

english
would it be the subject?

english
so in the second one 2)Brett earns his income by repairing cars. the gerund phrase is =by repairing cars and the function is= direct object?

english
what is the Gerund phrase and Noun function in these sentences? 1)Writing a research paper sounds difficult. 2)He must like studying calculus. 3)Her favorite pastime is entertaining friends. 4)Water skiing, sailing, and swimming are my favorite summer sports. 5)I enjoy playing...

Phys
A Brass rod 50.0 cm long expands 0.0734 cm when heated. Find the temperature change.

Chemistry
I went (dP/dT)fusion=deltaSm(fusion)/deltaVm(fusion) =deltaHm(fusion)/Tfusionm(1/pliq. - 1/psolid) =-140 barK^-1 So then deltaT=-deltaP/140 What is L? volume (litres?)

Chemistry
The normal melting point of H2O is 273.15 K, and deltaH fusion is 6010 J/mol. Calculate the change in the normal melting point at 175 and 625 bar assuming that the density of the liquid and solid phases remains constant at 997 and 917 kg/m^3 respectively. Explain the sign of y...

Chemistry
How many grams of lead(ii)iodide are generated when 400.0ml of 1.25M NaI reacts with 525.0ml of 1.00M Pb(NO3)2 according to the following balanced equeation? 2NaI + Pb(NO3)2---> 2NaNO3 + PbI2

Biology
Where is the Barnacle zone located in a rock platform ecosystem(Upper littoral, upper mid-littoral, lower mid-littoral or lower littoral zone)?

Chemistry
pH of 10^-3M HAc and 10^-2M NH4Cl in aqueous solution?? Do you just figure out each [H+] concentration separately and then add them??

physics
A short box with a large flat base is made of iron. The box has mass mI = 890 kg and specific heat cI = 450 J/kg◦C. The box is filled with water. The water has mass mW = 1220 kg and specific heat cW = 4180 J/kg◦C. The box and water are initially at temperature T0 =...

Alg. 2
3x-2/12 - 1/6 = 1/6 Please help me to solve.

US History
Why did many progressives of both major parties saw American entry into World War I as a peerless opportunity? Many Progressives during the First World War, Republican and Democrat alike, realized something of great importance to furthering their goals: they saw that the requi...

US History Since 1876
How is the KKK and the Universal Negro Improvement Association the same? I am having trouble with coming up with reasons on how they were the same. I have several different reason's why they are not but I need help with this please!!

english 11
1. In persuasive writing, it is important to (1 point)anticipate and address counterarguments. clearly state your position. provide facts and examples to back up your position. practice all of the above. 2. “Redskin” was originally a term for (1 point)Indians in gene...

US History Since 1876
WW 1 WWI ended with the Americans only seeing very little action. Its clear that the brunt of the fighting in the West was taken by the British Empire/Commonwealth and the French. The Bolshevik Revolution in Russia gave Germany the opportunity to wage the war on one front. Wit...

US History Since 1876
Did the United States win the war for the Allied Powers? Discuss the American contribution to the war effort and evaluate its significance.

statistics
Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the alloted time?

Math
1. The manager of a bottle shop makes 25% profit on the cost price of all bottles of wine sold in the shop. She charges $12 for a bottle of Open View reisling. A hotel room service charged $30 for a similar bottle of Open View reisling. a) How much profit does the hotel room s...

Math
Transform the equation by completing the square: 4x^2 + y^2 - 8x + 6y -3 =0 Also show foci

Physics
A 2 kg clay ball traveling left to right at a speed of 6 m/s strikes and sticks to a 10 kg ball at rest. What is the fractional loss of kinetic energy after collision?

Science
B)Water is constantly evaporating over the ocean surface especially at the equator due to no seasonal loss in sun intensity.

Math
1. Is it more appropriate to use scientific notation for approximates or exact numbers? why? 2. In one plantation, there are 2700 young trees correct to 2 significant figures. In the other there are 830 full grown trees, correct to 2 significant figures. a) Why is it incorrect...

math
Show that the following data could not possibly be fit by an exponential function x y 3 72 5 200 7 392

Physics
Two circuits (the figure below) are constructed using identical, ideal batteries (emf = E ) and identical lightbulbs (resistance = R). If each bulb in circuit 1 dissipates 4.00 W of power, how much power does each bulb in circuit 2 dissipate? Ignore changes in the resistance o...

Physics
About 5.12 x 104 m above Earth's surface, the atmosphere is sufficiently ionized that it behaves as a conductor. The Earth and the ionosphere form a giant spherical capacitor, with the lower atmosphere acting as a leaky dielectric. Find the capacitance C of the Earth-ionos...

Physics
Two circuits (the figure below) are constructed using identical, ideal batteries (emf = E ) and identical lightbulbs (resistance = R). If each bulb in circuit 1 dissipates 4.00 W of power, how much power does each bulb in circuit 2 dissipate? Ignore changes in the resistance o...

Physics
Where do you get 10^6 m/s? So is the answer 22.5 or 225,000,000

Physics
Comic-strip hero Superman meets an asteroid in outer space, and hurls it at 750 m/s, as fast as a bullet. The asteroid is three thousand times more massive than Superman. In the strip, Superman is seen at rest after the throw. Taking physics into account, what would be his rec...

phi 103
All dogs hate cats. Sirius is a dog. So Sirius hates cats" is an example of a

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