Tuesday

July 29, 2014

July 29, 2014

Total # Posts: 1,494

**chemistry .....chemistry**

what element include in the fireworks power ? why

** chemistry -------------chemistry**

If a flame on the candle burns red , how does energy of that flame compare to that of the Bunsen burner flame ? and why ? ans:The Bunsen burner flame has higher temperature than candle’s flame . Because flame of candle emit red ,and red has the least energy in visible light.

**chemistry ---------chemistry **

What color did your glass -stirring rod emid ? what does this indicate about glass- strirring rod ? Ans: galss stirring rod emids orange . but i dont know the ans 2 .

** chemistry ------------ chemistry ------- **

when you were heating milk on the stoven you accidentally spilled some milk on the burner . what color would you see ? why would you see that color? My answer : Intense yellow . because milk has sodium , sodium is intense yellow . is this right ?

**chemistry ------ flame test-------------**

thanks for your help

** chemistry ------ flame test-------------**

Did the nitrate ion effect the color emission of the solution ? how did you decide ? my answer: No , because The nitrate ion is the oxidizing agent in the compound without it you could not burn the chemicals and you could not produce a spectrum so there would be no emission o...

**Maria**

All of them

**Science**

Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 15.2 g of biphenyl in 29.5 g of benzene?

**Computer studies**

Draw a flowchart for a program that will accepts 30 intergers and print the number of positive and negatives numbers and the sum of the positive number

**physics**

A spring has a length of 60cm when it unstretched. A load of 10N increases its length to 64 cm and a load of 20N increases its length to 68cm a)what extension is produced by the 20N load? b) What length would the spring have if a load of 15N were added to it? c) Determine the ...

**history**

One of today's hot political topics is some states' measures to restrict voting. What historical precedents do we have for such efforts, in the South and elsewhere? Why were/are some people concerned about this?

**physical science**

A Weather balloon carries instruments that measure temperature, pressure, and humidity as it rises through the atmosphere. Suppose such a balloon has a volume of 1.2 m3 at sea level where the pressure is 1 atm and the temperature is 20oC. When the balloon is at an altitude of ...

**Physics**

A loaded truck can accelerate at 4 m/s 2. It loses its load so that it is only 0.1 as massive. By what factor must the acceleration change for the same driving force?

**Algebra 2**

x=4? y=100? Is That Right?

**Algebra 2**

Explain what the notation f(4)=100 means? We could also say that when x=___, y=___?

**Physics**

A loaded truck can accelerate at 4 m/s 2. It loses its load so that it is only 0.1 as massive. By what factor must the acceleration change for the same driving force?

**Physics**

A loaded truck can accelerate at 4 m/s 2. It loses its load so that it is only 0.1 as massive. By what factor must the acceleration change for the same driving force?

**chemistry ----------- chemistry **

on the atomic level , how are physical changes and chemical changes different ?

**Art**

Idk because i feel like modern art in the 20th century, is realistic, with the nude statues, and paintings, and things looking like a photograph nowadays. U know what im saying?

**Art**

ok so for the first question on how art will change in the future, i said it will be more.. realistic. Do u think thats a good answer?

**Art**

can you help, what is this question answering? It says, based on the examples you have seen from the various time periods in history, try to uncover any trends and deduce the direction art style is heading.

**Art**

Where are art styles going to lead in the near future

**childcare**

Discuss the responsibilities that a teacher has to volunteer parents when these parents are invited to particpate in learning activities. Include five responsibilties and an examplae of each

**physics**

If a person who weighs 125lb, rides a roller coaster with a 100m diameter loop at 30m/s. What force did the person exert?

**physics**

A glacier moves with a speed of 45 nm/s. How many years would it take for the glacier to move 0.87 km? Assume there are 365 days in a year. Answer in units of y

**Art**

Yeah i keep reading and i see that when he went to Rome to study the ruins, that's what inspired his own unique style.

**Art**

It just says to name what style he used. Its not very discriptive. And im not sure if i have to put one set style.. or multiple.. Because i think he used Gothic and classical styles in his works.. but I know he also assisted in the creation of the Renaissance style.

**Art**

Im seeing different things, i also read Roman or Classical style

**Art**

geometric style?

**Art**

What was Filippo Brunelleschi's style that he used? Is it.. Italian Renaissance? Thank you.

**Geo**

what has been the most significant event that happen in the world?

** chemitry--- physical & chemical change---**

describe a physical change that appears to change chemically???

**Pre-Ap Physics**

To win the game, a place kicker must kick a football from a point 17 m (18.5912 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 15 m/s at an angle of 58.9 ◦ from the horizontal. The ac...

**Pre-Ap Physics**

To win the game, a place kicker must kick a football from a point 17 m (18.5912 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 15 m/s at an angle of 58.9◦ from the horizontal. The acc...

**Pre-Ap Physics**

A rock is projected from the edge of the top of a building with an initial velocity of 16.3 m/s at an angle of 39 ◦ above the horizontal. The rock strikes the ground a horizontal distance of 90 m from the base of the building. The acceleration of gravity is 9.8 m/s 2. As...

**Pre-Ap Physics**

During World War I, the Germans had a gun called Big Bertha that was used to shell Paris. The shell had an initial speed of 2.65 km/s at an initial inclination of 41.9◦ to the horizontal. The acceleration of gravity is 9.8 m/s 2 . How far away did the shell hit? Answer ...

**Pre-Ap Physics**

To win the game, a place kicker must kick a football from a point 17 m (18.5912 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 15 m/s at an angle of 58.9 ◦ from the horizontal. The ac...

**Pre-Ap Physics**

During World War I, the Germans had a gun called Big Bertha that was used to shell Paris. The shell had an initial speed of 2.65 km/s at an initial inclination of 41.9◦ to the horizontal. The acceleration of gravity is 9.8 m/s 2 . How far away did the shell hit? Answer i...

**history **

how is plymouth settlers are different from the settlers at the Jamestown?

**History **

why does the pilgrims settlement of plymouth succeed?

**history**

what were some of the ways in which social darwinism or the idea of survival of the fittest shaped american thought in the past?

**Art**

What style did Filippo Brunelleschi use?

**physical science**

A 70-kg man and a 50-kg woman are in a 60-kg boat when its motor fails. The man dives into the water with a horizontal speed of 3m/s in order to swim ashore. If he changes his mind, can he swim back to the boat if his swimming speed is 1m/s? If not, can the woman change the bo...

**Pre-Ap Physics**

A rock is thrown upward at 51.1◦ with respect to the horizontal. As it rises, its vertical component of velocity 1. remains unchanged. 2. decreases. 3. increases. 4. Unable to determine.

**Physics Pre-Ap**

014 (part 1 of 2) You drop a stone from a position of rest. How far will it fall vertically in the ﬁrst 2 s? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m 015 (part 2 of 2) If you instead toss it horizontally at 2.7 m/s, how far will it fall vertically...

**physical scienece**

Does every moving body possess kinetic energy? Does every stationary body possess potential energy?

**physical sciencei**

ke=1/2 (mass)(velocity) ke=1/2mv^2 ke= 1/2m(10^2-0^2) ke=1/2m(20^2-10^2) ke=1/2m(100) ke=1/2m(400-100) ratio is 300/100 or 3/1

**chemistry -- radioactive decay **

suppose you have a 150 gram sample of radioactive decay god-191 which has a half- life of 3.4 hours. how many grams of gold will ramain after 10hrs ? after 24 hrs? answer : 10 hrs :10/3.4= 2.94 times 150*(1/2)^2.94 = 18.75 grams 24 hrs: 24/3.4 = 7.06 150*(1/2)^7.06= 1.12 right...

** Chemistry - radioactive decay .**

list 2 reason why this isotope of gold- 191 would not be a good substitute for making jewelry?

**Pre-Ap Algebra 2**

if the graph of the equation 3x+by=2 is perpendicular to the graph of 2x-3y=-4 determine the value of b

**History**

I don't have a history book!

**History **

How did Pilgrims live? Who were the Purtains?

**History**

What type of settlement did the Pilgrims build?

**History**

What did the Mayflower passengers create when they wrote "civil body politick"?

**History**

How did the Mayflower Compact create representative government?

**physics**

A passenger on a moving train tosses a coin with an initial velocity of (-2.25 m/s) + 4.68 m/s) (from the point of view of the passenger). The train's velocity relative to the ground is (11.5 m/s). (a) What is the minimum speed of the coin relative to the ground during its...

**math**

1,000,200; 1,000,300 each time add 100

**US history**

Thank you so much!!!!

**US history**

What were the essential elements of the settlement of Jamestown that allowed it to survive?

**Physical science **

If you put a 9th grade student in a bathtub and he foisted with most of his head and upper chest above water, how much water would spill out? Additional Information: Bathtub was full of the brim Student is male, and has a normal male IQ (85) Student weights 80kg Student has a ...

**Physical science**

And yes, would you please explain Thanks

**Physical science **

Will a ship loaded with beach balls weight more, less, or the same, as the ship empty?

**physical sicence**

how fast must a ball be thrown upward to reach a height of 12 m?

**physical science**

The 200.g head of a golf club moves at 40 m/s in a circular ARC of 1.2 m radius. How much force must the player exert on the handle of the club to prevent it from flying out of her hands at the bottom of the swing? Ignore the mass of the club's shaft.

**Math**

What is the rule for: Domain: 1, 3, 5, 7 Range: 1, 2, 3, 4 Thanks!

** Chemistry --- chemistry ---**

what is the difference between an atom and an ion ???

**history**

Which of the following is true of President G. W. Bush? A. He vowed to punish all countries sponsoring terrorism. B. He rejected unilateralism. C. He accepted the United States' role in the International Criminal Court. D. He reluctantly endorsed the Kyoto Protocol.

**statistics**

What are the sample median and the mode for males? The sample mean mark of the 50 male students is 8.30. If the sample mean for the entire sample is 8.42, what is the sample mean for the 75 female students?

**statistics**

What are the sample median and the mode for males? The sample mean mark of the 50 male students is 8.30. If the sample mean for the entire sample is 8.42, what is the sample mean for the 75 female students?

**chemistry ( chemistry lab)**

-'Gasoline engine' what are the waste products form this engine ? what element must gasoline be composed of ? -'fuel cell'what are the waste products from this cell ? what is the fuel used in the fuel cell? MY ANSWERs : - C02 , h20 and heat energy are waste pro...

** chemistry ---chenistry --- **

If it is assumed that a candle reacts with O2 ,in the air and the only products are energy , CO2 ,H20 ,what 2 elements must be present int he composition of the candle wax???

**History**

Who were the first sea explorers? Why did they explore the oceans? What resulted from their exploration? What did their exploration teach us about the world? What were the result of columbian Exchange?

**History Christopher Columbus**

Thank you Can please answer my other history question!

**History Christopher Columbus **

How did people first come to the Americas?

**Math**

29 I think... based on the order of operations.

**physics**

A popular entertainment at some carnivals is the blanket toss. (a) If a person is thrown to a maximum height of 26.0 ft above the blanket, how long does she spend in the air? (b) Is the amount of time the person is below a height of 13.0 ft more than, less than, or equal to th...

**chemistry (lab)**

how or where does the hat energy produced by the candle come from ?? help me!

**History**

Ok, thank you for answering my other history question :)

**History **

What are the new understanding of the population of the Americas before Eropian contact?

**History**

Thank you Can you please answer my other history question Please.....!!!!!

**History**

What are three ways in which the Americas might have been populated?

**History**

Thank you so much

**History**

How did geography of North America help or hinder our nation's development?

**Algebra**

If m angle BGC =16x-4 and m angle CGD = 2x+13,Find the value of x so that angle BGD is a right angle.

**Algebra**

If m angle FGE =5x+10, Find the value of x so that line FC is perpendicular to Line AE. Line AE is a striaght line

**Geometry**

Line MN is perpendicular to line NP. Point R is in the interior of the angle MNP. If angle MNR = 5x+12 and angle PNR =6x+23. Find both angle measures

**Geometry**

An angle is 15 less than four times its supplement. Find both angle measures.

**Geometry**

Two angles are complementary. One angle is ten less than three times the other angle. Find the measure of both angles.

**Geometry**

The m angle A is 30 more than twice angle B. If angle A and angle B form a linear pair, find the measure of both angles.

**Geometry**

Line AB is perpendicular to line BC. Point E is in the interior of angle ABC. If angle ABE = 2x+3 and angle EBC = 4x-9, find x. Then find the measure of both angles.

**chemistry**

chemical formulae which ends with ite,ate and ide

**chemistry**

many formulae which ends with ite,ate ide

**math**

ann wrote a three digit number. the digit inthe hendreds place is 4 less than the digit in the ones place. the digit in the tens place is two more than the digit in the ones place.the sum of the three digits is 16. what is the three digit number?

**math**

Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged $120 for 3 days and 300 miles, while Mary was charged $210 for 5 days and 600 miles. What does Best Rental charge per day and per mile?

**chemistry**

An electronic balance shows the number 2.705 grams ; which digits is/ are the uncertain digit and which are the significant digit?

**chemistry**

does the number 340 have the same meaning as the number 340.0??

**physics**

How far to the nearest meter can a sprinter running at 9 m/s, travel in the time it takes a rock to fall 65 meters?

**chemistry**

2180 nanometer =?meter

**chemistry**

description of the procedure , step by step ,that was used to find the densities.... help me ...!!!

**chemistry**

Using the idea of atoms write a desciption of the difference between an element with a low density and an element with a hight density ???

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