# jazz

Most popular questions and responses by jazz-
## Chemistry URGENT

A student heated a hydrated salt sample with an initial mass of 4.8702 g, After the first heating, the mass had decreased to 3.0662 g (two part question) 1. if the sample was heated to constant weight after reheating, what is the minimum mass that the

*asked on April 26, 2014* -
## chemistry URGENT

I need someone to check my answers to make sure that I have the correct answers. (3 Part Question) Two students each measure the density of a quartz sample three times: Student A Student B 3.20 g/mL 2.82 g/mL 2.58 g/mL 2.48 g/mL 2.10 g/mL 2.59 g/mL mean

*asked on April 26, 2014* -
## Chemistry URGENT

can someone please tell me what formula's to use for the 2 following chemistry problems. 1. Calculate the solubility of potassium bromide at 23 degrees Celsius. hint. Assume that the solubility increases by an equal amount for each degrees between 20

*asked on April 28, 2014* -
## math

the paralle side of trapezium are 20m and 30m and its non-paralle sides are 6m and 8m .find the area of trapezium

*asked on November 22, 2012* -
## poisson distribution math

Mr Lee is planning to go fishing this weekend. Assuming that the number of fish caught per hour follows a Poisson distribution with mean 0.6, find the number of complete hours that Mr Lee needs to fish so that the probability of catching more than two fish

*asked on June 8, 2010* -
## physics

The electric field at the point x = 5.00cm and y = 0 points in the positive x direction with a magnitude of 10.0 N/C. At the point x = 10.0cm and y = 0 the electric field points in the positive x direction with a magnitude of 16.0 N/C. Assume this electric

*asked on January 27, 2012* -
## Chemistry URGENT/DR BOB

Can someone may sure that I balanced the following groups of equations correctly. Write an equation to show how acetic acid reacts with water to produce ions in solution. C2H4O2 + H2O >>>>>>> H3O + C2H3O Write an equation for the neutralization of HCl and

*asked on April 23, 2014* -
## physics

An object with a charge of -4.5 micro C and a mass of 1.1×10−2 kg experiences an upward electric force, due to a uniform electric field, equal in magnitude to its weight. A) Find the magnitude of the electric field. B)Find the direction of the electric

*asked on January 27, 2012* -
## Math 0098

Last year, Deon had $20,000 to invest. He invested some of it in an account that paid 6% simple interest per year, and he invested the rest in an account that paid 10% simple interest per year. After one year, he received a total of $1880 in interest. How

*asked on February 22, 2013* -
## physics

In a pig-calling contest, a caller produces a sound with an intensity level of 110 dB. How many such callers would be required to reach the pain level of 120 dB?

*asked on November 26, 2011* -
## physics

A 4.00-kg object is attached to a vertical rod by two strings. The object rotates in a horizontal circle at constant speed 6.00 m/s. What is the tension in the upper string and the lower string. Well your missing information here, in order to compute the

*asked on October 9, 2006* -
## Chemistry URGENT/DR BOB

Hello Dr. Bob I have been sick and missed some of my classes and my classmates want to act stupid. So if its not too much trouble could you just make sure that I am on the right track and let me know what is wrong and how I can fix them. I have a lot of

*asked on April 23, 2014* -
## math gr8

calculate o.76& of 150% of 6000. i did 0.0076 x 150 = 1.14 6000 x 0.0114 = 68.4 but im not really sure how to do it. plz help!

*asked on November 1, 2008* -
## chemistry

true or false Entropy always tend to favor mixing Mixing result in positive change in entropy Entropy allows endothermic processes to be spontaneous Pure liquids don't have entropy Addition of salt to water increases entropy Entropy is the measure of

*asked on May 6, 2015* -
## Physics

A girl delivering newspapers travels 3 blocks west, 8 blocks north, then 5 blocks east. 1) What is the magnitude of her resultant displacement? Answer in units of blocks. 2) Find the direction (measured from due east, with counterclockwise positive) of her

*asked on October 31, 2016* -
## physics

Mars Rover When the Mars rover was deployed on the surface of Mars in July 1997, radio signals took about 12 min to travel from Earth to the rover.How far was Mars from Earth at that time?

*asked on March 4, 2012* -
## physics

Water flows through a horizontal tube of diameter 2.9cm that is joined to a second horizontal tube of diameter 1.5 cm. The pressure difference between the tubes is 7.2 kPa. A)Find the speed of flow in the first tube.

*asked on December 4, 2011* -
## math

the sale price of a computer at 15% off is $746.30. What is the regular price?

*asked on November 1, 2008* -
## geo

natural environment, history, and level of economic development are factors that influence population patterns. Looking at the case study on Australia, can you think of any other factors that may influence population patterns? Explain. umm.. translation

*asked on November 2, 2008* -
## math math math!

A cruise ship travelled 84 km in 3.5 h. At this rate, how long will it take to travel 1050 km?

*asked on November 1, 2008* -
## Calculus: Optimization

I have no idea how to approach this problem, if someone knows just how to relate h, r with H,R, that would be extremely helpful and I can workout the rest! Thank you in advance. Given a right circular cone, you put an upside-down cone inside it so that its

*asked on February 17, 2015* -
## math

In 1805, the population of a small town was 2120. By 1905, the population increased to 115% of the 1895 figure. a) what was the population in 1905? b) find the increas in population from 1895 to 1905.

*asked on November 1, 2008* -
## physics

The mass of the Earth is 5.98 × 1024 kg. A 6.83 kg bowling ball initially at rest is dropped from a height of 2.12 m. The acceleration of gravity is 9.8 m/s^2. What is the speed of the Earth coming up to meet the ball just before the ball hits the ground?

*asked on January 16, 2017* -
## Chemistry URGENT

Could someone let me know if I answered these questions? 1. How do you classify the liquid pair mineral oil -- H2O, miscible or immiscible? I believe the answer is immiscible because oil and water do not mix. 2. what would be the Molarity of a solution

*asked on April 29, 2014* -
## Modern world studies

Write a short paragraph that traces the rise of japan from an isolated society to major industrial and imperial power.

*asked on October 23, 2012* -
## Chemistry URGENT

I am not good with math problems. I need help with these two problems. I'm not sure what equations to use. please help. A student heated a hydrated salt sample with an initial mass of 4.9702 g. After the first heating, the mass had decreased to 3.0662g. 1.

*asked on April 24, 2014* -
## Repost(Physics)

A vehicle moves in a straight line with an acceleration of 2 km/h^2. By how much does the speed change each second? Answer in units of km/h. Plz help?

*asked on October 22, 2016* -
## Math

From a sample set of 10 colored balls--5 green, 3 red and 2 yellow-- 5 are chosen at random WITH replacement. What is the probability that the result will be: green, red, yellow, red, green? Write your answer as a four place decimal number. p(G,R,Y,R,G)

*asked on March 13, 2016* -
## physics

1.The speed of a train increased from 15 mi/hr to 25 mi/hr in a distance of 500 ft. Calculate the average acceleration in ft/s2. 2.An airplane taking off from a landing field has a run of 500 m. It starts from rest, moves with constant acceleration, and

*asked on October 9, 2010* -
## chemistry

I want to know if someone could let me know if I have written my balanced equations correct for the following questions. Write a balanced equation for the reaction of zinc with sulfuric acid. Zn + H2SO4 >>> Zn(S04) +H2 Write a balanced equation for the

*asked on April 21, 2014* -
## physics

The electron in a hydrogen atom with an energy of -0.544 eV is in a subshell with 18 states. What is the principal quantum number, n, for this atom? What is the maximum possible orbital angular momentum this atom can have? Is the number of states in the

*asked on April 12, 2012* -
## physics

What is the rms value of the electric field in a sinusoidal electromagnetic wave that has a maximum electric field of 64 V/m?

*asked on March 4, 2012* -
## physics

An electron drops from the L shell to the K shell and gives off an X-ray with a wavelength of 0.0205 nm. What is the atomic number of this atom?

*asked on April 12, 2012* -
## Physics

A vehicle moves in a straight line with an acceleration of 2 km/h^2. By how much does the speed change each second? Answer in units of km/h. Plz help?

*asked on October 22, 2016* -
## chemistry

I am unsure about balancing equation I would like for someone to let me know if I am working this out correctly? I have to write a balanced equation for the reaction when solid magnesium is added to a solution of lead(ii)nitrate, solid lead forms and the

*asked on April 14, 2014* -
## algerbra1

translate to an algebraic expression 49 less than b

*asked on October 26, 2010* -
## math

awhh man:( i just had one left. A store owner buys coats for 56$ each. she adds 30% to the cost and sells the coat s at 15% off. find the selling price of each coat. would i do 56 x 0.30 = 16.80 56.00 + 16.80 = 72.80 56.00 x 0.15 = 8.40 56.00 - 8.40 =

*asked on November 1, 2008* -
## math

janine is paid commission of 3% on all sales up to and including $10 000, and 5% on all sales over 10 000. how much commission will she earn on sales of 48 000?

*asked on November 1, 2008* -
## abnormal psychology

Is this true or false Abnormal psychology examines the concept of “differentness.” The spectrum of “differentness” is narrow in scope when compared to other areas of psychology.

*asked on November 3, 2013* -
## Math 0098

Last year, Joe had to invest. He invested some of it in an account that paid simple interest per year, and he invested the rest in an account that paid simple interest per year. After one year, he received a total of in interest. How much did he invest in

*asked on February 22, 2013* -
## physics

Water flows through a horizontal tube of diameter 2.9 cm that is joined to a second horizontal tube of diameter 1.5 cm. The pressure difference between the tubes is 7.2 kPa. Find the speed of flow in the first tube.

*asked on December 4, 2011* -
## Physics

a car travels at 20km/h for 1.5h, at 30km/h for 2.0h, and at 40kmh for 0.75 h. What is the car average velocity

*asked on August 1, 2011* -
## chemistry

A typical air sample in the lings contains oxygen at 100 mm Hg, nitrogen at 573 mm Hg, carbon dioxide at 40mm Hg and water at 47 mm Hg. What is the total pressure on the sample in mm Hg?

*asked on November 19, 2010* -
## Chemistry

Calculate the molarity of 1.77 mol of LiCl in 30.6 L of solution. This is for hw that's submitted online. the answer i got is 0.06 M. but it says its wrong, whyyyyy?

*asked on October 29, 2010* -
## health

Which organization would you call if you were involved in a natural disaster?

*asked on October 6, 2010* -
## Physics

A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 591 N. As the elevator later stops, the scale reading is 391 N. Assume the magnitude of the acceleration is the same during starting and stopping, and

*asked on October 9, 2006* -
## math

A Singaporean has assets of $5 billion.If he spends $10 every second,how long will it take for him to spend all his money

*asked on November 22, 2015* -
## abnormal psychology

Is this true or false With regard to life transitions, adolescence appears to be a time of particular stress because of the many changes that occur.

*asked on November 3, 2013* -
## physics

A uniform electric field of magnitude 2.80×10 ^4 N/C makes an angle of 37 degrees with a plane surface of area 1.40×10−2 m^2. A)What is the electric flux through this surface? N * m^2/C

*asked on January 27, 2012* -
## Math

Need help understanding 2010-2011 Transitional Unit: 06 Lesson 01- Unit: 05 TESCCC source It is called Maintain Your Balance Can someone please help?

*asked on January 18, 2012* -
## chemistry

a sample of unknown gas is found to have a volume of 479 mL at 27.0 degrees C and 1.30 atm. How may moles of gas are int eh sample?

*asked on November 19, 2010* -
## Chemistry

A single mole of AgNo3 weighs 169.88 grams. In order to make a 1M solution, how many grams of AgNo3 would need to be dissolved in 5oomL?

*asked on November 2, 2010* -
## chemistry

I have to write a balanced equation for the reaction of a solid lead being added to a solution of silver nitrate. Solid silver forms and the lead disappears as it goes into the solution as lead (ii) nitrate. I think it should be Pb + AgNO3 >>>> Ag +

*asked on April 14, 2014* -
## chemistry

I have to write a balanced equation for the decompostion of solid copper (ii) sulfate to form the gaseous sulfur trioxide and solid coper (ii) oxide. I would appreciate it if you could tell me if I have written it correctly. CuSO4 >>> SO3 + CuO If I did

*asked on April 14, 2014* -
## physics

A 5.2 m wire with a mass of 86 g is attached to the mast of a sailboat. If the wire is given a "thunk" at one end, it takes 0.085 s for the resulting wave to reach the other end. Part A What is the tension in the wire? Would the tension found in part A be

*asked on November 26, 2011* -
## science

How would i write an hypothesis for this? What grass seed grows the fastest?

*asked on November 2, 2008* -
## Chemistry URGENT

I need someone to check to make sure that I balanced my equations correctly. I have to add a (g) or (s) to indicate gases and precipitates. I am having a hard time figuring out the ions and how to add them, if any of these reactions need a ion could you

*asked on April 24, 2014* -
## physics

A circuit consists of a 12.0 V battery connected to three resistors 44 ohms, 15 ohms and 120 ohms in series. A)Find the current that flows through the battery. B)Find the potential difference across the 44 Ohms resistor. C)Find the potential difference

*asked on February 12, 2012* -
## chemistry

Find the mass of urea needed to prepare 51.7 g of a solution in water in which the mole fraction of urea is 7.59×10−2. anyone have the same values?

*asked on January 31, 2012* -
## physics

The speed of a train increased from 15 mi/hr to 25 mi/hr in a distance of 500 ft. Calculate the average acceleration in ft/s2.

*asked on October 9, 2010* -
## l2l

If I had 10 trees and i had to plant them in 5 rows of 4 how would it work i need to do this

*asked on June 17, 2010* -
## Chemistry

I have troubles with a titration of NaOH and HCl. The volume of the HCl is 30 ml and its concentration is 0.1 mol per liter The volume of the NaOH is 25 ml and the concentration is to be worked out. I understand that the reaction ratio for HCl to

*asked on May 17, 2010* -
## geo

name three population characteristics that tell us whether a country's population is changing(growing, stable, or shrinking)

*asked on November 2, 2008* -
## Math

I cannot remember how to find the slope of a line when you are given two points. Here is the problem. The slope of a line through (2,1) and (5,n) is 3. n=___ I ended up with -2. But I don't think that is the right answer. I put the points in

*asked on January 17, 2008* -
## Chemistry URGENT

I am having a hard time understanding how to calculate pH. my textbook states that that pH =-log[H^+]. I have two questions that asks: What is the H^+ concentration in an acid with of pH 4.6? Express your answer as a power of 10. What is the H^+

*asked on April 24, 2014* -
## physics

A 9.2V battery is connected in series with a 33mH inductor, a 190 Ohms resistor, and an open switch. A)What is the current in the circuit 0.140 ms after the switch is closed? in milli amps b)How much energy is stored in the inductor at this time? in micro

*asked on February 28, 2012* -
## geomatry

the measure of one angle of a linear pair is 3 thimes the measure of the other angle. find the measures of the two angles

*asked on October 18, 2011* -
## Math

Mrs tan baked some muffins and packed them i big and small boxes for sale.Each big bbox contained 4 muffins and each small box contained 2 muffins.At first,there were 4 times as many small boxes as big boxes.After she had sold half of the small boxes and

*asked on January 8, 2011* -
## 9th grade

In, 1914 how many European nations controlled territory in Africa?

*asked on December 21, 2009* -
## math.. again!

write each increase or decrease as a percent. the price of gasoline rose from 97.5/L to 101.4/L. Percent increase= i did: 101.4 - 97.5 101.4 x 0.0390 = 3.9% is this right?? im not really sure how to do this.sorry for all these questions.

*asked on November 1, 2008* -
## science

advanteges and disadvanteges of fossil fuels Check this site. http://home.clara.net/darvill/altenerg/fossil.htm advantages easy to get energy from not expensive to get energy from disadvantages pollutes the atmosphere with carbondioxide which leads to

*asked on October 12, 2006* -
## Physics

A knight sits on a castle wall during a siege. To while away the time, he notes that boulders catapulted from below land on the top of his wall with a vertical velocity of 7.5 m/s. If he is 34 m above the catapult, what is the initial velocity of the

*asked on October 25, 2016* -
## Physics

Judy, by chance, spots a potted plant falling outside the window at 1.6 m/s. Further down the same building, Judy’s boyfriend clocks the pot at 80 m/s. How far apart are the friends? The acceleration of gravity is 9.8 m/s^2. Answer in units of m. Plz

*asked on October 25, 2016* -
## Physics

Imagine a vessel containing 2.000 kg of liquid whose specific heat equals 1.50 kcal/kg/°c. Suposse that all of the liquid exists at its vaporization temperature of 450 k. We transfer 150 cal of heat energy to the liquid. What is the temperature of the

*asked on April 11, 2016* -
## genetics

If a green eyes girl whose father is green eyeid marries a brown eye boy then what genotype the nxt generTION has

*asked on April 21, 2015* -
## genetics

If a green eyes girl whose father is green eyeid marries a brown eye boy then what genotype the nxt generTION has

*asked on April 21, 2015* -
## chemistry urgent

I think I balanced these equation right please check and let me know. i am suppose to complete and balance the equations representing the reactions. NaHCO3 (s) + HCL (aq) >>>> NaCl + 2CO+H2O CaCo3 (s) + HCL (aq)>>> CaCl + CO3H Thanks

*asked on April 23, 2014* -
## Math

Does (-18) balance with (-6)+ 3(-4)? Show work to answer please

*asked on January 18, 2012* -
## math

the perimeter of an isosceles triangle is 30 inches. the legs are 1/3 as long as the base. set up an equation to find each side length of the triangle.

*asked on November 17, 2008* -
## math

Find the amount in each case. a) 8% is 56 kg. can u set up cross multiplication for this? 8/100=x/56

*asked on November 1, 2008* -
## math helpp! :|

in a bag of coloured cubes, the ratio of red cubes to total number of cubes is 5:7. If there are 105 cubes in the bag, how many cubes are red? i don't get this :|

*asked on November 1, 2008* -
## physics

A 1,5000kg car starting from rest is accelerated by a force of 2,oooN during the first 15seconds of its motion. Find the speed at the end of that's time

*asked on January 3, 2008* -
## Chemistry URGENT/DR BOB

Hello Dr.Bob, the saturate at 60 degrees Celsius is 85.5g i hope this helps with the problem I posted at 12:49am thanking you in advance

*asked on April 28, 2014* -
## Chemistry URGENT

Help. what is the formula to figure out the total mass of a solution?

*asked on April 28, 2014* -
## Chemistry URGENT

I need help to evaluate if I completed my experiment calculation. determination of water in a hydrate. 1. Mass of crucible, and cover = 18451.3 2. Mass of crucible, cover and sample = 23410.2 3. Mass of crucible, cover and sample after 1st heating =

*asked on April 26, 2014* -
## Chemistry URGENT/DR BOB

Hello DR. BOB, the correct value in the problem posted at 1:17pm regarding Student A and Student B accuracy and random error is the: MEAN of 2.63 g/mL. Could you take a look back at that post and let me know if i answered 2 and 3 correctly.

*asked on April 26, 2014* -
## Chemistry URGENT

I need help figuring out the calculations of my experiment. I'm sure I did something wrong cause I can not figure how to calculate the mass of sodium chloride. My measurements follow. 1. 250 mL beaker = 8.4 2. Mass of container = 0.4013 3. mass of

*asked on April 26, 2014* -
## abnormal psychology

Is this true or false Behavioral medicine and health psychology are concerned with reducing the stress of illness but not necessarily preventing the stress.

*asked on November 2, 2013* -
## Math :(

2b=b+2+b 2b= 2b+2 -2b=-2b+2 __________ B=2????

*asked on September 16, 2013* -
## Math-Data Management

In a random Sample of Canadians 30% have Beeburr CD's (B) 35% have Fergie CD's (F) 55% have Motorhead CD's (M) 5% have B and F 10% have B and M 10% have F and M 95% have at least one artist place in Venn Diagram Find Number and Describe: a) _____ n(BuFuM)

*asked on February 27, 2013* -
## check geo

the us is a leading exporter of a.oil natural gases b.rice products c.beef and grain. d.cranberries and rasberries

*asked on July 26, 2012* -
## physics

Two point charges, the first with a charge of +3.04×10−6 C and the second with a charge of -4.63×10−6 C , are separated by 22.5 cm. Find the magnitude of the electrostatic force experienced by the positive charge. Is the magnitude of the force

*asked on January 27, 2012* -
## Physics

3. The mortar shell was short and you cannot change the explosive charge. You determine that a horizontal velocity of 1,592 feet per second will put the mortar shell. What angle should the mortar be elevated to?

*asked on June 25, 2011* -
## music

was schubert a romantic or classic composer?

*asked on June 13, 2011* -
## algebra 1

heip me I tried everything 4(x -1) > 16

*asked on November 4, 2010* -
## algebra 1

help me please What is the smallest solution to the inequality 4 (x -1) > 16?

*asked on November 4, 2010* -
## algebra 1

can someone help me solve this equation 5x - 12 < 20

*asked on November 3, 2010* -
## psychology

what are the basic concepts of human interaction from a psychology perspective. In your examination, describe at least two examples of how human behavior changes based on social situations

*asked on March 28, 2011* -
## algebra 1

help please this question is driving my crazy. Suppose there is a 2-degree drop in a temperature for every thousand feet that an airplanes climbs into sky. If the temperature on the ground is 65 degrees, what would be the temperature when the plane reaches

*asked on October 26, 2010* -
## chemistry

what would be the mass of an Au sample whose volume is 2.85mL?( the density of gold is 19.3g/mL)

*asked on October 3, 2010*

## Pages

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