Kelvin

This page lists questions and answers that were posted by visitors named Kelvin.

Questions

The following questions were asked by visitors named Kelvin.

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...

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.

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

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

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?

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....

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 M...

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...

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...

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 o...

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...

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 t...

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?

Solve x: 2 over 5x+2=10

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

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)

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

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

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

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

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...

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 eith...

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

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 leve...

54% of the children in a large city are boys. Using a suitable approximation, calculate the probability that a random sample of 1000 children contains more boys than girls ?

A machine produces ribbon in which flaws occur randomly at an average rate of one flaw in 100m. Find the probability that there are 3 or more flaws in a randomly chosen 200m of ribbon. Find the length of ribbon such that the probability that it contains n...

How many grams of Ag2CO3 will precipitate when excess K2CO3 solution is added to 70.0 mL of 0.692 M AgNO3 solution? 2AgNO3(aq) + K2CO3(aq) --> Ag2CO3(s) + 2KNO3(aq)

A 58 kg woman is ice-skating toward the east on a frictionless frozen lake when she collides with a 94 kg man who is ice-skating toward the west. The maximum force exerted on the woman by the man during the collision is 210 N, west. Take east to be the po...

(1) A cone has height of 8cm and circular radius 6cm calculate (a) It's Volume (b) It's Slant Height (c) The Curved Surface Area (d) The Total Surface Area

Brianna is a flight student and is in the process of acquiring her private license in a Solo flight she uses a single engine airplane and travels a distance of 15 meters before takeoff in the air she travels at an approximate rate of 27 m/s on there no wi...

The molar enthalpy of combustion of demand is -6.78KJ/mol.What mass of decane would have to be burned in order to raise the temperature of 500ml of water from 20 degrees Celsius to 55 degrees celsius. I tried using ndeltaH=mcdeltat. But it didn't work. Pl...

What are answers to week 26 for forth grade

If 8A pass for 2minutes at the cathode(where the following reaction takes place, Ag+ + e- --->Ag) how many grams of silver metal are passed onto the cathode??

Identify and explain four types of risk behavior amongst teenagers by means of examples

function of liver

name and explain the laws that protect the citizens against xenophobia

Two towns P and Q lie on the same parallel latitude such that P is due east of Q. When local time at Q is 9.50am , the local time at P is 3.12pm. ( a) Find the longitude difference between P and Q (2mks) ( b) Given that the longitude of P is 52°E , find t...

Which of the following is a requirement for naturalization in the United States

If 197.1 mL of SO3 is collected (measured at 324 K and 52.6 mmHg) what is the percent yield of the reaction?

the longest side of a triangle measure 267m.If two angles 37 and 48 what is the shortest side and it angle

Length of an elastic cord when 2.8N is applied

i am the last animal poem ?

The travel timetable below shows the departure and arrival timer for a bus flying between two towns M and R,300km apart Town M arrival departure 0830h,N arrival 1000h departure 1020h,P arrival 1310h departure 1340h,Q arrival 1510h departure 1520,R arrival...

Log(x^2-x+2) base 2=1+2logx.... solve for x

You are principal speaker in school debate on the motion.boys and girls should be assigned equal work at home .write your entry for or against the motion

the points a, b and c have position vectors a 2i + j - k, b = 3i + 4j - 2k and c = 5i - j + 2k respectively relative to a fixed origin o. the position e lies on ba produced so that be = 3ba. write down the position vector is. the line ce cuts the line ad...

Please anyone to assist about this problem By using hyperbolic substitution integrate sqrt (9 - x^2)

Dear guys, kindly help me, outline 5 common methods which can be used to determine density or specific gravity of liquid

Hello people, Kindly help me. Give in details procedures of determining molarity of mass percentage liquid and it's density

Spark on the presence of flammable liquids may lead explosion, hence flammable liquid containers should be well stored/ handled to avoid explosion. list 5 sources of spark in laboratory

Outline five common sources of radiation in laboratory

Mentions ways to reduce accidents in the laboratory

How do we measure solubility of substance in laboratory

Factors affecting solubility

Methods of water treatment

Difference between second and third law of thermodynamic

State first law of thermodynamic and their daily applications

State second law of thermodynamic and their daily applications

Explain the forces acting on solute and stationary support in adsorption chromatography

Types of chromatography

Outline separation techniques with their principles

Give details procedures to prepare sample for analysis

Give details procedures to prepare stock solution

Give details procedures how to prepare a working solution from stock solution

Forces that act on solute and stationary phase in adsorption chromatography

Analytical techniques in chemistry

Types of titration

Data collected in ethnographic research

laboratory chemistry scientists might be asked sources of radiation then what other questions may be asked in written interview questions

What are the questions might be asked for a position in the university for laboratory chemistry scientists

What are the written questions might be asked for a position in the university for laboratory chemistry scientists

What are the written interview questions might be asked for a position in the university for laboratory chemist

What are the written interview questions might be asked for a position in the university/college for laboratory supervisor

What are the written interview questions might be asked for a position in the university/college for laboratory supervisor like molarity, thermodynamics, radiation

as laboratory chemistry scientists what kind of physical chemistry questions you may ask to the students

Discuss the principles of spectroscopy and its role in identifying chemical compounds.

Discuss the principles of chromatography and its applications in separation and analysis

How do you handle and expose hazardous waste materials in laboratory

Difference between entropy and enthlapy

How do you determine molarity experimentally

How do you determine molarity from titration

How would you determine vapour pressure of liquid components

Types of indicators

Types of indicators used in titration

Research methods

How do phenolphthalein, bromothymol and methyl orange behave in acid base titration

Types of research

Discrete variable

Independent variables

Controlled variables

Answers

The following answers were posted by visitors named Kelvin.

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

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

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

The Portuguese then!

please show me the calculations and the answer.Thank you.

Pls help me do it for me

Town Y = 60°W Procedures: A. Locate the places involved B. Find the time difference C. Convert the time difference to longitude D. Adjust the longitude to the direction of movement (west or east) A. 8am comes before 2pm So Town Y is in West B. 8—2 = 6hrs...

I don't understand

You are principal speaker in school debate on the motion.boys and girls should be assigned equal work at home .write your entry for or against the motion

At the school prefect you have been ask to Address your school on the falling standard of learning in your school

Explain types of dilution with vivid examples