# Posts by jazz

Total # Posts: 239

**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? How do you ...

**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 displacement. Answer...

**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 boulders? The acceleration...

**Physics**

never mind

**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 help

**Math**

2(x)+(2x-6)=48

**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?

**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?

**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 liquid in the vessel ...

**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)

**math**

Thank you Ms. Sue, have a good night.

**math**

This is my last question. The rest of my homework I knew.

**math**

the product of -3 and a number is at least 9 -3a_> 9 is this right.

**math**

Yay!! My heart just sank for a minute.. Thank you Ms. Sue.

**math**

Ok. is this right.. 14 less than a number is more than 54. d-14>54

**math**

The difference of a number and 5 is at most 20 x -5> 20 x -5 greater = 20 right

**math**

The difference of a number and 5 is at most 20 x -5> 20 x -5 greater =

**math**

Three more than a number is less than 17 3n<17, is this correct?

**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

**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 number of possible ...

**genetics**

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

**genetics**

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

**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 vertex is at the ...

**Biology**

I am on the exact same question and it seems like nobody in the entire universe knows the answer

**Chemistry**

first answer is NO, and part B. is 2 mol

**Chemistry**

All yall wrong its 0.135g

**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 containing 0.5 mole of ...

**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

**Chemistry URGENT**

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

**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 degrees C and 30 ...

**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 sample can have after the...

**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 = 21789.8 4. Mass of crucible...

**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.

**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 container + sodium ...

**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 2.63 g/mL 2.63 g/mL 1. ...

**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. if the sample ...

**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 explain it to me as ...

**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^+ concentration in a base with a ...

**Chemistry URGENT/DR BOB**

I have a couple of unfinished experiments i need help with as well. If you can help me. Thanking you in advance. If I tested the ph of NaOH and its H+ was 12.2 how would I express this in a power of 10? I really have no clue. Need help.

**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 assignments that I have...

**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

**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 ...

**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 reaction of ...

**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 magnesium disappears ...

**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 + Pb(NO3)2 does ...

**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 not write this...

**chemistry**

is 3M less or more concentrated than 9M of sulfuric acid? I think that 9M is more concentrated but I wanted to make sure. thanks

**CALCULUS ECONOMICS**

correct!!!! thnks dude

**CALCULUS ECONOMICS**

wrong !!!

**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.

**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.

**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.

**Math :(**

I'm having a hard time with the "no solution" problems. I'm still trying to find an answer when clearly there's none. Thank you

**Math :(**

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

**Math**

Thank you.

**Math**

2(4m+6)=8m+6 8m+12=8m+6 -6= -6 _________ 8m+6= 8m -8m. =-8m __________ 6=m I think in doing something wrong just not to sure when I check both sides give me different answer can someone explain please

**Math**

Five more than three times a number is 196 what is the number?

**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) b)Exactly...

**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 much did he invest ...

**Math 0098**

I don't think I'm doing this right because i am getting HUGE numbers like 156,000

**Math 0098**

it would be 7x+7y=70000? I don't know how to solve the two equations

**Math 0098**

where did you get .08 from?

**Math 0098**

Last year, Joe had 10,000 to invest. He invested some of it in an account that paid 7% simple interest per year, and he invested the rest in an account that paid 9% simple interest per year. After one year, he received a total of $860 in interest. How much did he invest in ...

**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 each account?

**math**

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

**help me pls :(**

jay is right 100%

**Modern world studies**

Give me 5 trace rise of japan from an isolated society to major industrial and imperial power.

**Modern world studies**

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

**check geo**

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

**chemistry**

8905=80(x)(200) and solve for x

**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 subshell with the next ...

**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?

**Pre-Algebra**

blah blah and blah

**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?

**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?

**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 joules

**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 across the 15 ohms ...

**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?

**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

**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 field is produced by...

**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 field. ...

**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 ...

**Math**

Equation Models Question Symbolic Model 2x+3=(-5) Answer and check the solution please.

**Math**

Well thank you very much Ms.Sue i appriciate it. Have a great day or night!.

**Math**

How would you use 2x+3=(-5) in a symbolic model? same things as we have been doing.

**Math**

Thank you!! Thank you!!

**Math**

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

**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?

**Math**

Thank you sooooo much! You ROCK!

**Math**

Write the first five numbers for the sequence that follows the rule 1/4x+3

**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.

**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.

**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 larger or ...

**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?

**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

**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

**math**

how about if the raduis of right circular cone is given and the surface area is given what is the formula? help please?

**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?

**math**

$0.50

**music**

was schubert a romantic or classic composer?