Friday
September 19, 2014

Posts by tj


Total # Posts: 165

chemistry
2. A researcher is often required to prepare solutions in the lab. Typically, a lab provides a concentrated solution. This solution must be diluted to the proper concentration. Hydrochloric acid is a common stock solution that is typically purchased at 37.0% HCl concentration...
September 10, 2014

Physic
A soldier is tasked with measuring the muzzle velocity of a new rifle. Knowing the principles of projectile motion, he decides to perform a simple experiment at the indoor firing range. The soldier hangs a target a distance of d = 113 m from the end of the barrel. The rifle is...
September 10, 2014

Geography
What is domant volcano?
July 24, 2014

Math Helppp
Scores for men on the verbal portion of the SAT-I test are normally distributed with a mean of 509 and a standard deviation of 112. (a) If 1 man is randomly selected, find the probability that his score is at least 579. (b) If 13 men are randomly selected, find the probability...
June 2, 2014

trig
a carousel has eight evely spaced seats shaped like animals. During each ride, the carousel makes between 8 and 9 clockwise revolutions. At the end of one ride, the carousel stops so that the lion is in the position where the zebra was when the ride started. through how many ...
May 7, 2014

CHHS
A a ferris wheel has a diameter of 100ft. The passengers ride in cars that make 5 revolutions in 7.5 minutes. Approximately how far does a car on the Ferris wheel travel in 1 minute
May 7, 2014

pjysics
A capacitor that has 10 cm diameter plates, 0.1mm apart, is charged at 100 V and the battery removed afterwards. What are the charges on each of the platesimmediately after charging the capacitor? What is the voltage if the distance between plates is increased to 0.5 mm? How ...
April 22, 2014

MATH
Guess what the next number in this sequence is: 16, 5, 14, 7, 21, 9, ____
February 6, 2014

math
y=3x-8^x 3-8^x*ln(8)
October 15, 2013

art
Rhythm
October 15, 2013

Physics
My bad. I don´t know the other one Half loop N= (k*d^2/m-2*g*R)*(m/R)
October 15, 2013

Physics
only number 5 wich is (5/2)*R
October 15, 2013

Physics
Consider an ideal spring that has an unstretched length l0 = 3.3 m. Assume the spring has a constant k = 23 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a distance of x0 = 1.6 m from...
October 15, 2013

math
How could the height of a tall pine tree be estimated without climbing it and measuring it?
October 11, 2013

that
Georgia purchased a house in 1998 for $220,000. In 2003 she sold the house and made a net profit of $50,000. Find the effective annual rate of return on her investment over the 5-yr period. Please round the answer to the nearest tenth of percent.
October 3, 2013

Physics
Bob rides his bicycle on a bike path that is 75 kilometers long to get to his house that is due east of the bike path. If it takes Bob 15 hours then what is his velocity?
September 21, 2013

Science
What resources should a scientist use to research water pollution?
August 28, 2013

math
Im having trouble with number lines. Can you tell me if .45 is equal to 4/10
April 29, 2013

Math
What figure has an infinite number of lines of symmetry?
April 22, 2013

CHEMISTRY
after starting with 0.343g Al and excess HCl the volume of H2 gas collected over water was 472ml. the atmospheric pressure was 754 mmHg and the temp was 21c. 1 balanced chemical equation? 2calculate the pressure in atm of dry hydrogen gas in a mixture
April 18, 2013

math
How do you write out 121.2 million
April 8, 2013

Math
150 ml Thanks so much
April 1, 2013

Math
There are about 5 ml in one teaspoon. There are 3 teaspoons in one tablespoon. How many ml are there in 10 tablespoon?
April 1, 2013

Statistics Math
The annual per capita consumption of fresh apples (in pounds) in a nearby state can be approximated by a normal distribution, with a mean of 15.4 pounds and a standard deviation of 3.8 pounds. (a) What is the smallest annual per capita consumption of apples that can be in the ...
April 1, 2013

physics
238J
March 29, 2013

Math
Find the number of each kind of object in the collection Curt has 12 models in all. Three of the models are airplanes. Curt has 5 more models of cars than boats. How many models of cars does Curt have?
March 1, 2013

The Diary of Anne Frank
B?? She wants her father to understand she is trying to be a better person.
February 14, 2013

Math
Explain It Adam made 19 paper cranes Monday and 8 more Tuesday. He gave 9 friends an equal number of cranes. How many cranes did each friend received? Explain how you found your answer.
February 10, 2013

math
2ounces
December 13, 2012

math
If a pastry chef has 13 lbs of apple slices to make 8 apple pies if slices are distributed equally what will be the wright of the apple slices used to make eavh pie
December 13, 2012

Math
A curve has equation y= 2 + x - x^2. Find coordinates of 3 unknown points on the line. 1st point is at negative x, y value. 2nd point is at x=0 and y is positive. 3rd value is at y=o and x is positive.
December 9, 2012

Physics
I dont know the answer
October 16, 2012

physics
A uniform rod 8m long weighing 5kg is supported horizontally by 2 vertical parallel strings at P and Q and at distances of 2m and 6m from one end. Weights of 1kg, 1.5 kg, and 2kg are attatched at distances of 1m, 5m, and 7m respectively from the same end. Find the tension in ...
October 16, 2012

physics
A uniform rod 8m long weighing 5kg is supported horizontally by 2 vertical parallel strings at P and Q and at distances 2m and 6m from one end. Weights of 1kg, 1.5kg ,and 2kg are attatched at distances of 1m, 5m, and 7m respectively from the same end. Find the tension in each ...
October 16, 2012

math
how do you answer this qestion 3 plus 11multiplyed(70-175)divided by 7
September 19, 2012

finance
don't know the answer
September 8, 2012

Calculus 1
Find constants a and b in the equation f(x)= ax^b/(ln(x)) such that f(1/3)= 1 and the function has a local minimum at x= 1/3
June 2, 2012

Math
There are six different toppings for pizzas, sausage, hamburger, pepperoni, ham bacon and pork. There are three different cheeses, american, mpzzarella, parmeasan. the pizza comes with two different meats and one chese , how many different combinations of pizzas are possible?
May 17, 2012

Chemistry
What minimum amount of 1.55 M \rm HCl is necessary to produce 26.5 L of \rm H_2 at STP?
May 16, 2012

finance
You take out a 30- yr mortgage loan, purchase price is $120,000 put $20,000 down and finances the balance of $100,000 at fixed annual loan rate of 12%, what will be your monthly payment? How much total interest will you have paid at the end of 30 years?
May 4, 2012

Math Help PLEASE!
Find the equation of the hyperbola whose vertices are at (-1,-5) and (-1,1) with a focus at (-1,-7). Please and thank you.
April 21, 2012

java
Write a program that will find the lowest common denominator of two numbers. The user will enter the two denominators, the program will output both the lowest common denominator and the multipliers required for each fraction. For example, if the user is trying to add 1/3 and 1...
April 15, 2012

geometry
QUADRILATERAL ABCD IS A RECTRANGLE IF AC=2X+13 AND DB=4X-1 FIND DB
March 23, 2012

Math
What are the next two numbers in this pattern? 72 86 75 89 80 ___ _____
March 15, 2012

Math
Wow Thank you So much
March 8, 2012

Math
88 44 64 32 52 ___ ____ Can someone help me figure out the pattern?
March 8, 2012

Math
Each fire hose is 25 yards long. What is the minimum number of hose for a 230 ft distance? (I think I have to convert 230 ft into yards which is 76.666 yards. So I think I need a miminum of 4 hoses. ) Am I correct?
March 1, 2012

CHEM
Why are gamma rays generally not shown when writing nuclear equations ?
February 22, 2012

mathj
Baker Company purchases a new delivery truck for $20,000. The truck is expected to have a useful life of 90,000 miles before replacement, and a salvage value of $2,000. In its first year the truck was driven 22,000 miles, and a further 19,000 miles in year two. What is the ...
February 8, 2012

business math
Dennison Property Company purchases a new office space for lease to small businesses for $2,400,000, including a land value of $400,000. The property is placed in service on March 15, 1999. Using MACRS, what is the depreciation on this property at the end of its first year? (...
February 8, 2012

math
I think 200 L but I'm not sure
February 8, 2012

math
What is the capacity of a bathtub 200 L or 34,000 mL?
February 8, 2012

math
THANK U!
February 7, 2012

math
128 FEET 4 INCHES
February 7, 2012

math
DAN WAS WALKING FROM ONE END OF THE MALL TO THE OTHER END. HE TOOK THE FOLLOWING MEASUREMENTS OF FIVE STOREFRONTS: 23 FEET 11 INCHES, 25 FEET 2 INCHES, 18 FEET 3 INCHES, 28 FEET 8 INCHES, AND 32 FEET 4 INCHES.IF DAN ADDED ALL THE MEASUREMENTS, WHAT WOULD BE THE TOTAL DISTANCE.
February 7, 2012

math
Julie is going to the mall. She has 15 coins in her pocket that nadd up to $2.18. She has the same number of pennies as she does dimes. she has 5 more quarters than she has nickels. If she has 3 pennies, how many quarters, dimes and nickles does Julie have?
February 7, 2012

prpblem solving
A customer enters a store & purchases slippers for $5, paying for the purchase with $20 bill. The merchant, unable to make change, ask the grocer next door to change the bill. The merchant then gives the customer the slippers & $15 change. After the customer, leaves the grocer...
January 19, 2012

math
Am i suppose to multiply 5 x 9 and add 1 I come up with 46/5. Am I suppose to subtract 3/5 from that answer?
January 19, 2012

math
How do you subtract 3/5 from 9 1/5 I am having trouble understanding the work can u help
January 19, 2012

physics
If a rock being swung on a rope experiences a centripetal acceleration of 40 m/s2 while traveling at 8 m/s, what is the length of the rope
January 19, 2012

Math
Would you rather have $10,000 or a stack of pennies 10 miles high? After you make your choice, figure out the value of the stack of pennies.
January 17, 2012

english realism and regionalism
When we are introduced to Peyton Farquhar, he is in the last few minutes of his life as he waits for the support to be kicked out from under his feet so that the hanging can take place. The foreshadowing occurs when Farquhar imagines freeing himself from he rope, falling into ...
January 16, 2012

chemistry
Water can be decomposed to hydrogen and oxygen. How many grams of water must decompose to yield 24.0L og gases at 1.00atm and 25 degrees C? I used n=PV/RT to find 0.981 moles of gases. I then took the ratio of O2 to H2 to find the moles of oxygen compared to hydrogen. 0.327 ...
December 8, 2011

chemistry
A 10.0L flask contains 3.0atm of ethane and 8.0 atm of oxygen at 28 degrees C. The contents of the gas are reacted and allowed to return to 28 degrees C. What is the pressure of the flask? Using n=RT/PV I converted atm to moles and then used the balanced equation to find that ...
December 8, 2011

psychology
Time Remaining: 1. If the concept is truck, the prototype might be: (Points: 5) a Ford pick up. bulldozer. gravel eighteen wheeler. personnel carrier. 2. If the prototype is block or ball, the concept is: (Points: 5) construction. toy. child. play. 3. All major cities have a ...
November 2, 2011

psychology
The experimental rats were being raised in separate environments. One group lived in the traditional cage in a quiet, but well lighted room. They were supplied with plenty of food and water. The second group inhabited "Rat Disney Land." There were colorful toys, ...
November 2, 2011

psychology
One of the arguments against inherited racial differences in intelligence is based on data that shows: (Points: 5) a college education reduces the gap between the IQ scores of white and black races. nutrition reduces the gap. scores for black test takers improve as they mature...
November 2, 2011

psychology
In their book The Bell Curve, Murray and Herrnstein supported their claim of intelligence differences between races as attributable to
November 2, 2011

psychology
Nisa has grown up in a small village in the foothills. There was no electricity and water had to be hand pumped. They seldom saw people from the "outside." When she entered school the bus had to pick her up at 6:30 am in order for her to arrive at school by 8:30 am. ...
November 2, 2011

psychology
Nisa has grown up in a small village in the foothills. There was no electricity and water had to be hand pumped. They seldom saw people from the "outside." When she entered school the bus had to pick her up at 6:30 am in order for her to arrive at school by 8:30 am. ...
November 2, 2011

psychology
The testing company has hired qualified people in the field to administer the new test bank to subjects of different ages and ethnic backgrounds. They need a sizable number of scores from inner city, urban, and country/small town subjects. Their goal is to gather sufficient ...
November 2, 2011

psychology
. One attribute that the Stanford-Binet, WAIS-III, and WISC-IV have in common is that they are all: (Points: 5) timed. written. administered individually. group tests.
November 2, 2011

psychology
. One attribute that the Stanford-Binet, WAIS-III, and WISC-IV have in common is that they are all: (Points: 5) timed. written. administered individually. group tests.
November 2, 2011

simplify
78-1.40-2.47
October 27, 2011

math
mr jacob is 55 years old and tony is 7 years old. in how many years will mr. jacob be 4 times as old as tony?
October 26, 2011

ap world history
3.Differentiate between the Paleolithic and Neolithic eras. 4. Describe the agricultural transition. 5. Give examples that illustrate the difference between independent origin and cultural diffusion. IM STUCK ON THESE I DID ALL THE REST!!! HELP ASAP????!
October 24, 2011

statistics
There are 44 mathematics major and 163 computer science majors at the college. How many ways are there to pick 2 representatives, so that one is a mathematics major and the other is a computer science major?
October 19, 2011

science
Have a crossword puzzle An element found in nature. second letter a last letter l seven letters total
September 13, 2011

physics
A 2.00 kg blob of Gak, moving at 4.0 m/s, strikes a motionless figure skater in the back and sticks. The skater, with the Gak on her back, glides off at 0.160 m/s. Calculate the skater’s mass.
May 18, 2011

chemistry2
Please help I think the moles are already given so molality=mol of solute/kgofsolven so i think 12.0/ I am stuck also
May 11, 2011

Math
An indoor track is shaped like a rectangle with a semi-circle on each end. The distance around the track is 200 yards. Find the maximum area enclosed by the track.
April 26, 2011

Algebra
The town of Appleville recorded the following dates and populations. YEAR POPULATION (in thousands) 1980 51.5 1985 53 1990 56 1995 62 Estimate the approximate population of Appleville in 1988 by finding an equation and then substituting.
April 22, 2011

high school chem 1 (stoichemestry)
using equation: 2Fe(OH)3 + 3H2SO4 -> Fe2(SO4)3 + 6H2O question: How many Molecules of H2O can be made from 9.21 x 10^22 molecules of H2SO4?
March 2, 2011

chem 1 high school
equation: 4NH3(g) + 5O2(g) -> 4NO(g) + 6H2O(g) What mass of O2 is needed to produce 0.563g of NO? I think the answer is 750g but how do I get that answer?
March 2, 2011

12th grade chemistry
How many molecules of water can be made from 9.21 x 10^22 molecules of hydrogen sulfate? The equation is 2Fe(OH)3 + 3H2SO4 -> Fe2(SO4)3 + 6H2O
March 2, 2011

high school chem 1
thanks Dr. Bob
March 1, 2011

Math
The answer is B because all factors in 5^3 x 7^2 x 19^2 are prime. For example, 5,7,19, 3 and 2 cannot be decomposed. An example of decomposed is 9 where it can be divided by a number other than 1 and the number itself.
February 26, 2011

types of business writing
what is the answer to penn foster exam 02800601
February 9, 2011

English
can you check my grammar and content? i need to submit this paper for an exam and want to get a good grade.
February 8, 2011

Algebra
(x^-2y^2z)^-3/(x^-4y^2z)^-2
February 4, 2011

math
(x^-2y^2z)^-3/(x^-4y^2z)^-2
February 4, 2011

math
I had this same exact problem Change "OF" to "Multiply". 4/9 OF 3/16= 4/9 x 3/16= 1/12
January 3, 2011

physics
hmm i somehow got .3161 but thats wrong according to my online instructor.hmm
December 21, 2010

physics
does stand for gravity?
December 21, 2010

physics
i posted this question before however i did not understand drwls explanation. anybody else want to try ? Sam tosses a ball horizontally off a footbridge at 3.1 m/s. How much time passes after he releases it until its speed doubles?
December 21, 2010

physics
umm i need help...which equation would i use to solve the probnlem and how do i go about finding the answer? Here it is: Sam tosses a ball horizontally off a footbridge at 3.1 m/s. How much time passes after he releases it until its speed doubles?
December 20, 2010

chemistry
55 g/mol x 1 mol/22.4 L x 0.011L = __ g
December 12, 2010

chem.
I really don't understanf how jameschadwick discovered the neutron. iread websites and read the 18 pg. article but what was his experiment?
December 12, 2010

physics
The answer is .45 T F = B(I)L B = F/(I)L B = .90/4(.5) B = .45 T (T is Teslas)
December 1, 2010

physics
A 0.50 kg ball that is tied to the end of a 1.1 m light cord is revolved in a horizontal plane with the cord making a 30° angle, with the vertical (a) Determine the ball's speed. (b) If, instead, the ball is revolved so that its speed is 4.0 m/s, what angle does the ...
November 22, 2010

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