# Posts by Kelvin

Total # Posts: 158

**chemistry**

i got 831 i don't think this is right???

**chemistry**

i got 352 is that right

**chemistry**

If methane at a pressure of 3.2 atm and at 21 °C is introduced into a container, the gas be heated to ______°C to increase the pressure to 12 atm.

**Sound engineering**

A Question of engineering about Sound. How to calculate in step by step? Thank you. The octave bands¡¦ Sound pressure levels in dB re 20 £g Pa are: Hz 57 129 220 420 1K 2K 4K 8K dB 85 95 90 80 88 70 68 72 What is the overall A-weighted sound pressure level?

**Math**

(x^2+y^2)^2=4(x^2-y^2) Equation of a lemniscate curve ?! Can you solve this

**Math**

(x^2+y^2)^2=4(x^2-y^2) Equation of a lemniscate curve

**Physics**

In order for a satellite in free fall to maintain uniform circular motion, ______________. a) there must be a tangential acceleration b) there must be angular acceleration c)there must be a centripetal force d) there must be a circumventing force Its either a or c. Can't ...

**Physics**

thx

**Physics**

For which of the following situations can the equation F = mg not be used to calculate the force due to gravity? a) The pull of gravity on an apple on the surface of the Earth. b) The pull of gravity on an airplane flying at an altitude of 8 km above the surface of the Earth. ...

**Physics**

thx =)

**Physics**

Evaluate the following as true or false. If the Earth shrank in size, but all other factors remained the same, all of its satellites, including the Moon, would fly off into space. a) True b) False

**Chemistry**

n >1 && l >= 2

**accounting**

Lisa school supplies suffred a fire loss. The company needs to estimate the cost of good destroyed. Beginning inventory was 100,000 purchases totaled 600,000 and sales came equaled 1,000,000. Lisa normal gross profit percentage is 40%. What is the estimated cost of the ...

**chemistry**

According to molecular view, kinetic energy, what happens when 2 tablespoons each of water, methylated spirit and petrol are put in an open container separately in relation to time and the rate of vaporisation?

**chemistry**

According to molecular view, kinetic energy, what happens when 2 tablespoons each of water, methylated spirit and petrol are put in an open container separately in relation to time and the rate of vaporisation?

**chemistry**

According to molecular view, kinetic energy, what happens when 2 tablespoons each of water, methylated spirit and petrol are put in an open container separately in relation to time and the rate of vaporisation?

**Pre-Calc**

Find the values of the trigonometric functions of è from the information given. (sin è, cos è, csc è, sec è, cot è) tan è = −2, sin è > 0

**pre-calc**

Find the area of a triangle with sides of length 5 and 8 and included angle 74°. (Round your answer to one decimal place.)

**math**

Which type of graph is best suited for displaying the number of hours spent studying by students in different age ranges?

**Trigonometry**

What representations do not change the location of the given point (7,140°)?

**Trigonometry**

What representations do not change the location of the given point (7,140°)?

**psychology**

Psychology

**calculus**

Find .... Tan^3(xy^2+y)=x Use derivative

**calculus**

Tan^3(xy^2+y)=x Use derivative

**Calculus**

An ice cube is melting such that the side of the cube is decreasing at the rate of 1/4 t^2 cm / min. It is given that the side of the cube is 8cm at the start of the experiment. Calculate the length of the side of the cube when t = 4? ( answer 2 2/3 cm)

**Algebra**

Using complete sentences, explain how to graph y = x - 2 using the slope-intercept method.

**pure math**

2logy=log2+logx

**math**

you say;4%/$3,000=$75,000 therefore 4% of $75,000=$3,000

**algebra**

Solve x: 2 over 5x+2=10

**MATH**

Coach Johnson is 10 years older than Tim. When Tim started football 3 years ago, Coach Johnson was twice his age. How old is Tim now?

**MATH**

Maya and Sally were the two finalists in a singing competition. The person with the most votes from the audience was chosen as the winner. Sally received 25% of the total votes and lost by 62,500 votes. No person in the audience was allowed to vote more than once. The equation...

**math**

Maya and Sally were the two finalists in a singing competition. The person with the most votes from the audience was chosen as the winner. Sally received 25% of the total votes and lost by 62,500 votes. No person in the audience was allowed to vote more than once. The equation...

**math**

A store offers a 15% discount on all items in the store during a sale. All store employees get an additional 10% employee discount. In the equation below, C represents the cost of an item for an employee including tax, and x represents the original price of the item. C = 0....

**math**

If x represents the total number of bags a person checks and each person checks more than two bags, the equation below can be used to determine C, the total fee for all the bags. 20 + 25 + 50(x - 2) = C Arianna paid a total of $145 to check all her bags on a flight. How many ...

**192**

a pizza has a radius of 9inches. the pizza is divided into sections. one of the section has a central angle with a measure of 60 degrees wat is da area of this section of pizza? what happens to the area of the sector if u double the central angel? how much greater in feet is ...

**Algebra(urgent)**

a boat moves through still wather at x kilometers(km) per hour. it travels 24km up stream against a current of 2km per hour and then returns with the current. The rate upstream is x-2 because the boat moves against the current and the rate downstream is x+2 because the boat ...

**Algebra**

a boat moves through still wather at x kilometers(km) per hour. it travels 24km up stream against a current of 2km per hour and then returns with the current. The rate upstream is x-2 because the boat moves against the current and the rate downstream is x+2 because the boat ...

**Physics**

de rosunant in n3-m is 4

**political 100**

why can't the president sit down with a group of able and intelligent advisers and produce an ffective program to address the problems facing the nation?

**economics**

3. Consumer spending on durables falls, draw a graph to analyze the effects of this change in real interset. 4. The Canadian demand for Mexican Pesos is downward sloping and supply of pesos is upward sloping. Assume a system of flexible exchange rate between Mexico and Canada...

**6th Grade Math**

The farmers boy is going to market again. This time he's taking his faithful dog, two geese,and three bags of corn. He again has to cross the river,but this time he can only carry two items across at a time. He knows if he leaves tham alone, the dog will eat the goose and ...

**Math**

The senior class was being lined up by height-shortest to tallest- for the graduation ceremony. Bert is shorter than Phillip, Jessie is taller than Michelle,and Michelle is shorter than Bert. Once they were lined up, Phillip was three people taller than Michelle, and Michelle ...

**math**

Mr. Wilson and one man got on a streetcar. At the secong stop three people got on. At the third stop, three people got on and one got off. At the fourth stop, three got off. At the fifth stop, six people got off. At the sixth stop, one-half of the passengers got off and Mr. ...

**Math**

This year my teacher read us the book The Phantom Tollbooth, and since then I've been having strange dreams about drving in usuaual places and paying tolls unusual characters.Last night I dreamed about highway in the clouds near the mythical Mt. Olympus. At my first ...

**math**

Mrs. Cason gives her class a spelling quiz every Monday, a math quiz every other Monday and a history quiz every third Monday . Sally smarty is in Mrs. Carson's class. She received a grade of 100% on all three quizzes today. How long will it be before she again has to take...

**math**

Mrs. Cason gives her class a spelling quiz every Monday,and a history quiz every third Monday . Sally smarty is in Mrs. Carson's class. She received a grade of 100% on all three quizzes today. How long will it be before she again has to take all three quizzes in on day?

**math**

The gym is sponsoring a basketball elimination tournament with 16 teams entered. Winner play winners until only one team is left. What is the total number of games that must be played?

**math**

A fireman stood on the mioddle step of a ladder, shooting water into a burning building . As the smoke lessened, he climbed up three steps and continued his work. the fire got worse,so he had to go down five steps. Later he climbed up the last six steps and was at the top of ...

**high school**

U.S GORVEMENT ENFORCEMENT OF EVIRONMENTAL REGULATIONS HELPS REDUCE HEALTH PROBLEM RELATED TO ENVIRONMENTAL POLLUTION. HOW DOES THIS HELP PROMOTE ECONOMIC GROWTH AND STABILTY?

**college**

For the reaction NO(g) + O3(g) „_ NO2(g) + O2(g) The frequency factor A is 8.7 X 1012 s-1 and the activation energy is 63kJ/mol. What is the rate constant for the reaction at 75 ¢XC?

**college - Advertising**

Hi there, What is the criticisms of advertising? Any sites that talk about the criticisms of advertising?

**college - economics of china**

"Hi there! Can you tell me about economics of China? Can you suggest any credible source that I can look up for those information?

**Economy / History**

Hi there! Can you tell me about history of China and/or its economy? What is their current issue/political system? Can you suggest any credible source that I can look up for those information? Thx.

**physical**

how are electronic devices used to process information? come on i'd rather be doing other things pleaseeee answer this question! its easy for all you A students

**physical science**

how are electronic devices used to process information?

**bio**

cillia

**English**

diction is the way the writer talks so if the author was writing a story about the south he'd use southern slang to make it more believeable

**science**

In the process called fluorescence, some substances absorb photons of one kind of radiation (e.g) ultraviolet radiation), and give out photons of a different kind (e.g visible light). When infrared radiation falls on these materials, visible light is not emitted. Why not? If ...