Friday
October 24, 2014

Posts by Joe


Total # Posts: 2,105

Chemistry
the half-life of cobalt-60 is 5.20 years.. how many milligrams of a 2.000-mg sample remains after 6.55 years
October 8, 2012

Math
Come up with an expression for a function f such that the domain of f is all real numbers, lim (f(x) = 3) as x approaches 2 and f(2) = 3.
October 8, 2012

Free Fall
The acceleration due to gravity on planet X is one fifth that on the surface of the earth. If it takes 3.9 s for an object to fall a certain distance from rest on earth, how long would it take to fall the same distance on planet X?
October 4, 2012

Economics
There are two types of consumers of potatoes: 10 are rich and 50 are poor. Every rich consumer has a demand of 0 for a price of $500/ton; and his/her demand decreases by 1 ton each time the price increases by $1/ton. Every poor consumer has a demand of 0 for a price of $280/...
October 2, 2012

social sciences
The market supply for potatoes in New York is 2,000 tons for a price of $200 a ton, and 5,000 tons for a price of $500 a ton. Between these two prices market supply is a straight line. What is the equation of the supply curve?
October 2, 2012

Math
7
October 1, 2012

chem
Which of the following solutions has the highest concentration of Cl- ions? 500 mL of 0.10 M NaCl 100 mL of 0.20 M MgCl2 200 mL of 0.10 M FeCl3 400 mL of 0.30 M NH4Cl 200 mL of 0.20 M KCl
October 1, 2012

chemistry
NO ITS RIGHT
October 1, 2012

chemistry
it said that was wrong
October 1, 2012

physics
46.8
September 30, 2012

physics
Three vectors are shown in Fig. 3-32 (A = 60.0 , B = 56.0°). Their magnitudes are given in arbitrary units. Determine the sum of the three vectors. (a) Give the resultant in terms of components. (b) What is the magnitude of the resultant? What is the resultant's angle ...
September 30, 2012

physics
i dont get what theta is or arcsin
September 30, 2012

physics
You are given a vector in the xy plane that has a magnitude of 85.0 units and a y component of -60.0 units. What are the two possibilities for its x component?
September 30, 2012

physics
An airplane is traveling 675 km/h in a direction 42.5° west of north (a) Find the components of the velocity vector in the northerly and westerly directions. b) How far north and how far west has the plane traveled after 3.00 h?
September 30, 2012

physics
Vector V1 is 8.98 units long and points along the negative x axis. Vector V2 is 4.00 units long and points at +50.0° to the +x axis. a) What are the x and y components of each vector? (b) Determine the sum V1 + V2.
September 30, 2012

physics
A delivery truck travels 15 blocks north, 21 blocks east and 18 blocks south. What is its final displacement from the origin? Assume the blocks are equal length. magnitude and direction
September 30, 2012

physics
A car is driven 105 km west and then 65 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?
September 30, 2012

STATISTICS
The height of PU men are normally distributed with mean 65 in. and standard deviation 5.3 in. find the probability of finding: a. A men selected is at least 75 in. tall? b. A man selected is no less than 58 in. tall?
September 30, 2012

algebra
(2x+3)^2 is 25x right?
September 29, 2012

College algebra
(2x-3)(x^2-3x+5)
September 29, 2012

College algebra
How do I solve this?(7x+5y)^2
September 29, 2012

college algebra
(x+5y)(7x+3y)How do I solve this. I know I have to somehow combine the x and y but can't remember.
September 29, 2012

college algebra
how do I solve this: (17x^3-5x^2+4x-3)-(5x^3-9x^2-8x+11) and putting the resulting polynomial in standard form?
September 29, 2012

math
I copied it from the page I got it from - hummm? so 3,000,000 cant be a 6 digit # can it? Maybe its 300,000
September 25, 2012

math
it is a 6 digit number. there is no repetition of digits. It is divisible by 5 and is more than 3000,000. The digit in the hundreds place is 3 more than the digit in the ones place. The digit in the ten thousands place is 3 times the digit in the hundred thousands place. The ...
September 25, 2012

college physics
A new planet has been discovered that has a mass one-tenth that of Earth and a radius that is one-sixth that of Earth. Determine the free fall acceleration on the surface of this planet. Express your answer in the appropriate mks units.
September 24, 2012

college physics
Although astronauts appear weightless, they are not. They only appear weightless because they are in free fall. If a 79 kg astronaut is orbiting Earth with an orbital radius of 5.31×107 m, determine how much the astronaut would weigh. Earth's mass is 5.974 1024 kg.
September 24, 2012

college physics
new planet is discovered orbiting a distant star. Observations have confirmed that the planet has a circular orbit with a radius of 21 AU and takes 118 days to orbit the star. Determine the mass of the star. State your answer with appropriate mks units. [NOTE: AU stands for &...
September 24, 2012

economic
its is B?
September 22, 2012

economic
In a free market, which of the following is an accurate statement regarding price? A) Prices tend to increase. B) The price of a good or service helps to quantify its value to consumers. C) None of these statements are accurate. D) Sellers offer misleading information to beef ...
September 22, 2012

economic
it is true?
September 22, 2012

economic
A price set above equilibrium price creates a shortage. True or False
September 22, 2012

economic
it is true?
September 22, 2012

economic
In microeconomics, little emphasis is given to how prices are established and why they change. True or False?
September 22, 2012

economic
Store managers must consider which of the following trait? A) Cultural style B) Age groups C) Income level D) All are correct
September 22, 2012

business law
B. Telephones S.'s store and orders certain goods that S. delivers to B. Neither party says anything about the price or payment terms. B. does not pay S. Is S. entitled to be paid by B.? Why?
September 21, 2012

business law
A music club sends you an advertisement. You select ten "free" downloads and agree to become a member. When you get your free downloads, you decide to resign. Does the music club have any rights against you? Why?
September 21, 2012

Physics
A speedy tortoise can run at 0.09 m/s, and a hare can run 20 times as fast. In a race, they start at the same time, but the hare stops to rest for 2.4 min, so the tortoise wins by a shell (20 cm). How long does the race take? Answer in units of s What is the length of the race...
September 19, 2012

physics
FFFFFFFFFFUUUUUUUUUUUUUUUUU
September 18, 2012

math
A vampire could have the ability to infect an entire planet if he bit 2 people each day. Those 2 people would bite 2 people the next day, and then all of those vampires would each bite 2 people the next day, and so forth... How would I solve this to find out how many people ...
September 17, 2012

Differential Equations
A tank originally contains 5 lb of salt dissolved in 200 gal of water: Starting at time t=0, a salt solution containing 0.10 lb/gal is to be pumped into the tank at a constant rate and the well-stirred mixture is to flow out of the tank at the same rate. a)The pumping is to be...
September 17, 2012

Statistics
2
September 16, 2012

Physical Science
waves moving on a lake have a speed of 2.0 m/s and a distant of 1.5m between adjacent crest. what is the frequency of the waves? find the period of the wave motion?
September 13, 2012

Physics
A car traveling at a constant speed of 39.6 m/s passes a trooper hidden behind a billboard. One second later the trooper starts the car with a constant acceleration of 2.25 m/s^2 . How long after the trooper starts the chase does he overtake the speeding car? Answer in units of s
September 9, 2012

Physics
An airplane moves at 300 mi/hr relative to the air. It must fly from city A to city B, 600 miles due east. One day the wind is blowing at 100 mi/hr in a direction of 30 degrees north of east. Draw a diagram. b. What will the velocity of the plane relative to the ground (value ...
September 9, 2012

College Physics
A 6107 kg elevator is moving 4.6 m/s up. The tension in the elevator cable is 66,512.6 N. Determine the acceleration of the elevator (state the appropriate mks units).
September 9, 2012

Diff Eq
If y(t)=3e^(t^2)is known to be the solution of the initial value problem y'+p(t)y=0, y(0)=y_0, what must the function p(t) and the constant y_0 be?
September 7, 2012

Math
Jim is paid overtime when he works more than 40 hours of per week. Write an expression for the number of hours he works overtime when he works h hours. Find the number of hours Jim works overtime when he works 40, 44, 48, and 52 hours
September 6, 2012

spanish
what is the spanish word for "see you soon"
September 4, 2012

physics
A small rock is thrown vertically upward with a speed of 13.0from the edge of the roof of a 37.0 tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected. A) What is the speed of the rock just ...
September 3, 2012

math
sorry i forgot to say that i dont need the answer... i need an equation or expression that models this situation.
September 3, 2012

math
a man who is 5 feet tall stands 15 feet from a lamppost that is 27 feet high. how far away from the man is the tip of his shadow?
September 3, 2012

7th grade math
What's the quickest amount of time that all four kids can get across a bridge with on kid always going back to get the other. 1 kid took 5 minutes 1 kid took 10 minutes 1 kid took 20 minutes 1 kid took 25 minutes
September 3, 2012

Business
Assume that garbage collection is now free. Suppose a local goverment began to charge a household $2 every time that a household put out a can of trash for weekly garbage collection. Using the concept of opportunity cost explain how this might alter behavior.
September 1, 2012

math
you lie sir!!! ^
August 31, 2012

Calculus
A person needs to swim to shore from Point A and walk to Point B. They can swim at 2mph and walk at 4 mph. Write an expression for the total time their journey will time their journey will take in terms of x. Then use your graphing calculator to estimate the value of x which ...
August 30, 2012

math
If a+2b/a-2b=3, determine the value of a+3b/a-3b
August 28, 2012

Math
If you are estimating a problem like 147 divided by 5, is five a 10?
August 15, 2012

health
no keep posting its very helpfull
August 11, 2012

Math
A fraction of a square mile is a field that is a 1/2 mile long and 1/4 mile wide. What is the fraction?
August 10, 2012

Physical Sciences
.25L times .5M=.125moles .125 times 40= 5 grams
August 10, 2012

Physics
An air-hockey puck of mass m floats across the table essentially frictionless on a cushion of air. This puck bumps nearly head-on into a second puck that has 3 times the mass, moving in the opposite direction but with the same speed, v i , as the lighter puck. Immediately ...
August 6, 2012

math
a diving board is 4 feet above a pool that is 15 feet deep. The total length of a person's dive is 10 feet. How many feet below the surfac of the water did the person dive
August 6, 2012

Earth Science
I need help with the following Lab due tonight, 7/30/12, as I feel completely lost and would appreciate the help. The lab goes as follows: Design an experiment that illustrates the determination of the density of a cylindrical object found in the Lab Kit. Prepare a dynamic ...
July 30, 2012

physics
If an engine produces a (mass flow rate) of 100kg/s of thrust, what is the force in Newtons?
July 19, 2012

Chemistry
For the reaction 2NH3(g) 3H2(g) N2(g) at 472oC equilibrium is established when [H2] =0.0200M, [N2] = 0.0100M and [NH3] = 5.37x10^_8 M. What is the equilibrium constant for the reverse reaction?
July 16, 2012

Physics
A ball (mass m = 250 g) on the end of an ideal string is moving in a circular motion as a conical pendulum. The length L of the string is 1.84 m and the angle with the vertical is 37 degrees. a) What is the magnitude of the torque (N m) exerted on the ball about the support ...
July 11, 2012

Physics
Any idea how I was hung up on 2nd one?
July 11, 2012

Physics
A ball (mass m = 250 g) on the end of an ideal string is moving in a circular motion as a conical pendulum. The length L of the string is 1.84 m and the angle with the vertical is 37 degrees. a) What is the magnitude of the torque (N m) exerted on the ball about the support ...
July 11, 2012

Trig
Given y=2-4cos(3x-pi/4), find each of the following, giving the general representation of the location of all minimums. Also provide the graph of two full cycles, labeling everything. Domain = Range = Amplitude = Period = Ph. Shft. = Interval for one Complete cycle = ...
July 9, 2012

pre cal
verify identity (sinx-cosx)^2=1-sin(2x)
June 30, 2012

Chem!
20.4
June 28, 2012

Algebra 1 (Scientific Notation)
4.3 x109
June 28, 2012

5 grade math
Min's fish are sick,and she wants to add medicine to the tank. The base of the fish tank measures 40 cm by 25 cm.The tank is filled with water to a height of about 20 cm.How many drops of medicine should Min add to her tank? Reminder:1L=1,000cm squared
June 23, 2012

math
Min's fish are sick,and she wants to add medicine to the tank. The base of the fish tank measures 40 cm by 25 cm.The tank is filled with water to a height of about 20 cm.How many drops of medicine should Min add to her tank? Reminder:1L=1,000cm squared
June 23, 2012

chem
How many moles of C6H12O6 are formed when 0.250 mole of CO2 is consumed in the reaction 6 CO2 + 6 H2O C6H12O6 + 6 O2?
June 20, 2012

Physics - Center of Mass
The density of a 5.0-m long rod can be described by the linear density function λ(x) = 145 g/m + 14.2x g/m2. One end of the rod is positioned at x = 0 and the other at x = 5 m. a) Determine the total mass of the rod. b) Determine the center-of-mass coordinate.
June 16, 2012

math
j costs twice as much as b. b costs twice as much as k. all three letters together cost 17.50. what is the price of each letter?
June 6, 2012

world history
the evolution of the socio political milieu during colonial period, including protestant, christinity impact on colonial social life
May 25, 2012

math
solve csc^2x - cscx + 9 =11
May 19, 2012

algebra
If the sales tax is 6.5%, how much tax will you pay on a jacket that costs $48?
May 15, 2012

math
When Ms. Jackson told her students that the circumference of a circle divided by the diameter of the circle is ð, Jarrod asked how this could be true for all circles. Of the following, which provides the best basis for explaining why this is true for all circles?
May 11, 2012

english
would this be a clause
May 10, 2012

english
thank you and the last one is We hit a snag while rowing to shore. and the italicized phrase is (while rowing )
May 10, 2012

english
past participle ?
May 10, 2012

english
so it can be one of these: past participial phrase noun clause adverb clause nominative absolute ellipitical clause but its not a clause
May 10, 2012

english
its confused and sign
May 10, 2012

english
plz help fast
May 10, 2012

english
(confused) is italizied
May 10, 2012

english
What type of clause or phrase is italicized in the sentence below? The driver, confused by the sign, made a wrong turn.
May 10, 2012

statistics
psychologist wants to interview subjects with IQ scores are normally distributed with mean of 100 and standard deviation of 15. find the score that separating the top of IQ frin the bottom 90%
May 9, 2012

english/check please
I have to change the sentences on the top by adding an interjection and put a punctuation. I need to know did I use the correct interjections and the right punctuations too forget about the spaces before each exclamation . please just correct my interjection words and the ...
May 2, 2012

english/check please
Add an interjection to each of these sentences. Be sure to punctuate correctly. 1- Isn't that beautiful? - Ah! isn't that beautiful ? 2-We're having a test . - My goodness ! Were having a test ! 3- That hurts. - Ouch ! That hurts ! 4- I ripped my best shirt. -Wow...
May 2, 2012

english
Write whether a sentence is simple, compound, complex, or compound-complex. 5-The day of the party arrived, and everyone showed up at the Huang's house in costume. Compound 6-Kim wanted a new watch for a graduation gift. Simple 7-Because she was swimmer,she wanted one that...
May 1, 2012

english
Write whether a sentence is simple, compound, complex, or compound-complex. 1-Mrs. Huang planned a party for Kim because she was graduating from high school. Complex 2=She invited Lisa,Elena,and Enrique to the party. Simple 3-Mr. Huang thought that kim's friends should ...
May 1, 2012

english
A complex sentence made from independent clause and dependent clause joined together
May 1, 2012

english
5-complex
May 1, 2012

english
1-compound 2-complex 3-complex 5-compound
May 1, 2012

english
Write if the sentence is simple, compound,or complex. 1-I'd like to help you ;however,I am very busy today. complex 2-Do you know what Willie said.simple 3-I think that I've seen that movie before.simple 4-The person in the middle of the line is my brother Willie....
May 1, 2012

english/help me
Ralph,who is a student,also has a part-time job. 1)What is the independent clause in this sentence? who is a student,also has a part-time job. 2)What kind of dependent clause is( who is a student) in this sentence? Is it a noun, adjective,or adverb clause? Adjective clause I ...
May 1, 2012

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