# Posts by james

Total # Posts: 2,491

Science
WELL WE KNOW IT COOLED SLOWLY AND...

Physics
A 7.1 kg watermelon is placed at one end of a 5.9 m, 244 N scaﬀolding supported by two cables. One supporting cable is at the opposite end of the scaﬀolding, and the other is 0.54 m from the watermelon. How much tension is in the cable at the end of the sca&#...

chem
1. A 4.61 g sample of one of the substances listed in the table below was heated from 21.3°C to 315.7°C, requiring 190 J to do so. What substance was heated? I got mercury(l) 2. Calculate the energy required in joules and calories to heat 33.9 g of aluminum from 30.7&...

Math
40

Maths and Physics
Your clue is impossible, water release at a velocity of 20m/s cannot lift a 10 kg garbage can under earth's gravity. F=lambda 2v^2 (assuming elastic collision) = 2mv^2/d = 2(dm/dt)(v^2)/u = 20N which can lift a can of 20/9.81 kg so your water can only lift a max of 2.04 kg...

Chemistry re-post
Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M TI3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (a) Write the balanced reaction. Sn4+ + 2e- <...

Chemistry (Electrochemistry)
Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M Ti3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (a) Write the balanced reaction. Sn4+ + 2e- <...

Chemistry
Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M Ti3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (a) Write the balanced reaction. Sn4+ + 2e- <...

Chemistry (Re-post)
The distribution co-efficient of butanoic acid (pKa = 4.8) between water and two organic solvents are given below; Benzene D= 3.0 Octanol D= 6.2 a) which organic solvent is expected to extract the acid most efficiently from the water? explain your answer. So you expect that ...

Chemistry
The distribution co-efficient of butanoic acid (pKa = 4.8) between water and two organic solvents are given below; Benzene D= 3.0 Octanol D= 6.2 a) which organic solvent is expected to extract the acid most efficiently from the water? explain your answer. I understand that D ...

Chemistry
Imagine that you have a 7.00L gas tank and a 4.00L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 145atm , to what pressure should you fill the...

Chemistry (Electrochemistry)
The thickness of a pure Ag plate on a base metal is to be determined by controlled potential coulometry. The metal sheet is masked except for a circular area, 0.5cm in diameter. Electrical connection is made to the metal and the sheet is clamped in a cell so that the unmasked ...

geometry
From an apartment window 24 m above the ground, the angle of depression of the base of a nearby building is 38 degrees and the angle of elevation is of the top is 63 degrees. How tall is the nearby building?

Math
6 9/8-25/6=

AP Calc
For the curve f(x)=x ln x+(1-x)ln(1-x), find the value of x in the interval 0<x<1 where f(x) has a minimum.

algebra
Traveling downstream a certain boat went 21 mph. Traveling upstream it went only 5 mph. Find the speed of the boat in still water and the speed of the current.

Chemistry
If 25.00 ml of H2SO4 solution is titrated to an end point with 32.16 ml of 0.1986 M NaOH, what is the molarity(M) of the H2SO4 acid?

Chemistry
Which of the following factors affect the solubitity? a)temperature of the solutions b)polarity of the solvent vs solute molecules c)partial pressure of the gas above the solution d) all of the above

Math
A boy is dividing M&Ms between himself and his sister. He gives 2 to his sister and takes 2 for himself. He gives 2 to his sister and takes 4 for himself. He gives 2 to his sister and takes 6 for himself, and so on. (b) After n rounds, how many M&Ms does his sister have and ...

Biology
The Deflex binds with the receptors in the synapses which means the transmitter can no longer bind to the receptors, this means that the nerve impulse cannot be sent along the relay neurone. Deflex also binds to the neurotransmitter once released and breaks it down.

Physics
A ball of mass m is attached to a spring with a spring constant k. The system is attached to a thin vertical axis as shown in Figure 4. In its equilibrium vertical position the spring length is L. The axis starts to rotate with a constant angular frequency ω. Find the ...

AMA
A force of 1.24 N pushes against an object with a mass of 0.16 kg for 3.00 min. The object does not move. What is the work done on the object by the force?

Math
Limit(7x+6x^2) / (7x^2+6x) x->inf

Sociology
Alright. Thanks Writeacher.

Sociology
Are Ethnic Groups the same as Societies?

history
the huguenots were

Thank You reiny do you think you can explan this one The total income from three investments was \$2400. After 14 years, Investment I income has doubled, Investment II income has increased by 50% and Investment III went broke. If the income increase in Investment I equals the ...

A man has \$210,000 invested in three properties. One earns 12%, one 10% and one 8%. His annual income from the properties is \$20,100 and the amount invested at 8% is twice that invested at 12%. How much is invested in each property? at 12% 10% and 8% What is the annual income ...

A man has \$210,000 invested in three properties. One earns 12%, one 10% and one 8%. His annual income from the properties is \$20,100 and the amount invested at 8% is twice that invested at 12%. How much is invested in each property? at 12% 10% and 8% What is the annual income ...

Calculus
The slope of the line tangent to the curve xy+(y+1)^2=6 at the point (2, 1) is

math
The 3rd term of a geometric progression is nine times the 1st term.if the 2nd term is one twenty fourth the 5th term.find the 4th term.(there is a mistake in the 2nd to the last statement.help locate the mistake{final answer 4th term =48).i solved to this extent.ar^2=9 r=3.

math
the 3rd term of a geometric progression is nine times the 1st term.if the 2nd term is one-twenty fourth the 5th term.find the 4th term.(my solution so far).ar^2=9a r=sqr of 9 r=3.help me find the 1st term

math
The 3rd term of a geometric progression is nine times the first term.if the second term is one-twenty fourth the 5th term.find the 4th term. solution ar^2=9a r=sqr of 9 r=3.pls help me on how to get the first term(a)

math
The third term of a geometric progressiom is nine times the first term.if the second term is one-twenty fourth the fifth term.find the fourth term.ar^2=9a. r=sqr of 9 r=3.pls teach me how to get the first term and i can get the 4th term myself

Chemistry
Provide the name(s) for the branched constitutional isomer(s) with the molecular formula C7H16 that have three methyl groups.

Chemistry
Provide the name(s) for the branched constitutional isomer(s) with the molecular formula C7H16 that have three methyl groups.

Math
A stone was dropped off a cliff and hit the ground with a speed of 112 ft/s. What is the height of the cliff? (Use 32 ft/s2 for the acceleration due to gravity.)

Math
A particle is moving with the given data. Find the position of the particle. v(t) = 1.5sqrt(t), s(9) = 33

geography
How has Mexico's culture been shaped by conflict among different people?

chemistry
3. After removing membranes from an eggshell, the shell is dried and its mass is recorded as 5.613 g. The egg is transferred to a 250 mL beaker and dissolved in 25 mL of 6 M HCL. After filtering, the solution containing the dissolved eggshell is diluted to 250 mL in a ...

science
A 2000kg car traveling at a speed of 27m/s skids to a halt on wet concrete where μk = 0.20.

Science, Chemistry
Write reactions showing how each of the following buffers would neutralize added HCl. HF and NaF Express your answer as a balanced chemical equation. Identify all of the phases in your answer. HC2H3O2 and KC2H3O2 Express your answer as a balanced chemical equation. Identify ...

Science, Chemistry
Write neutralization reactions for each of the following acids and bases. HNO3(aq) and Ba(OH)2(aq) Express your answer as a balanced chemical equation. Identify all of the phases in your answer.

accounting
a 10 year coupon bond that yield 5% is issued with a 1000 par value. what is the issuance price of the bond

Math
Question: Write a word problem using 7 groups. And then solve the problem Can you give an example?

Physics
1800n

Physics
A cannon is fired from the ground at an angle of 30 degrees. It is being shot an an initial velocity of 200m/s. What is the maximum height of the cannon ball? How fat will the cannon ball travel before it hits the ground

science, chemistry

Computing- Python (simple-ish stuff)
Great thanks so much!

Computing- Python (simple-ish stuff)
Hi, I'm working on this piece of code: numLaptops = 7 laptopCost = 599.50 price = numLaptops * laptopCost print("Total cost of laptops: \$%.2f" % price) But the question wants me to explain the output if I put 2.5 instead of .2, 8.2 instead of it and 3.1 instead ...

chem
Calculate the total pressure in the flask after all of the oxygen has been removed from the air in the flask. Assume that the temperature is 25¡ÆC, the initial barometric pressure is 760 torr and that air is 21% oxygen by volume.

chemistry
A chemist wants to make 5.50 L of a 0.300 M lithium phosphate solution. What mass of lithium phosphate must be used to make this solution?

statistics
Suppose that the amount of time it takes the IRS to refund to taxpayers is normally distributed with a mean of 12 weeks and a variance of 9. a. What percent of taxpayers should get a refund within 5 weeks? b. What percent of taxpayers will get their refund within 10-15 weeks? ...

research methods grant writing
The table labeled “Brooklyn Precinct Activity Measures” shows counts of different indicators from the June 1999 Compstat report. All data are totals for the period January 1, 1999, through June 20, 1999. Notice, in the key to this table, that some indicators are ...

calculus
A lamp post 3m high is 6m from a wall. A 2m man tall is walking directly from the post toward at 2.5m/s. How fast is his 1.5 from the wall

mathematics
what is algerdra

chemistry
a sample of freon-12 occupies 25.5 litters at 28 celsius find its volume at 15 degree celcius when the pressure is kept constant

physics
A water balloon is launched at a building 24m away with an initial velocity of 18 m/s at an angle of 50° above the horizontal. If the balloon misses or shoots over the building, how far will the balloon land from its launch location?

physics
A water balloon is launched at a building 24m away with an initial velocity of 18 m/s at an angle of 50° above the horizontal. At what height will the balloon strike the building?

Cheeeem
how to calculate the weight of solute req'd to prepare 1 liter of 1 normal of: a.) LiOH b.) phosphoric acid HELP.

Physics
A plane starts from rest at the end of a runway and requires 200.0 km/h for takeoff . If it takes 30.0 a to reach takeoff speed, what acceleration must the plane's engines provide to get off the runway ?

CALCULOUS
A bank account is growing by 4.3 % per year. Find the doubling time. Round your answer to the nearest integer. Can someone explain how to solve this step by step. I have been stuck on this for quite a while

Pre Calc
Use the Rule of 70 to estimate how long it takes a dollar-sign 7000 investment to double if it grows at the annual rate 7 %. Compare with the actual doubling times. Round your answers to three decimal places. I found the estimated doubling time using Rule of 70 to be 10. I am ...

us history
These committees act as study groups for the House and Senate. (1 point) select committees conference committees joint committees standing committees

Math
Using the following cash flows for projects A and B, use payback period, discounted payback period, NPV, IRR, and MIRR to see if these are good projects or not. > Project A: (283,000); 46,000; 89,000; 104,000; 123,000; 187,000; and 72,000 > Project B: (318,000); 72,000; ...

Science URGENT
A. 0.75 Hz

Engineering Dynamics
A ball is thrown so that the motion is defined by the equations x=5t and y=2+6t-4.9t^2, where x and y are expressed in meters and t is expressed in seconds. a) find velocity at t=1s, b) find the horizontal distance the ball travels before hitting the ground.

physics
An airport has runways only 196 m long. A small plane must reach a ground speed of 38 m/s before it can become airborne. What average acceleration must the plane’s engines provide if it is to take off safely from its airport? Answer in units of m/s 2

physics
a 700 newton man is able to climb up 4.5 meters on a 6 meters ladder before it slips. What must be the coefficient of friction be if the ladder is arranged so that it makes an angle 50 degrees with the ground? Assume the ladder to be uniform and weighing 450 newtons.

math
an object weighing 40 tons hits an object at 40 MPH what is the force of the impact?

math
If bacterium divides every 20 minutes. How many will there be in a day?

Physics for Technology
I have been out of school 27 years; no Algebra or Trigonometry training: only remedial math. This class is part of a Diploma program, no placement test required - I am out of my depth. I had a tutor for an hour last Tues., with another appt. this Tues. Yet, like I told my ...

Chem
Determine the number of protons and electrons in each of the following ions. Na+ Enter your answers numerically separated by a comma. Np, Ne =

college algebra
1. simplify x^2+x-6/x^2-4 divided by x+3/2x+4

trigonometry
Write the quadratic function whose zeros are: 1. 2+square root of 5, 2-square root of 5 2. 3+7i,3-7i 3. 5±i Please tell me how to get them. I have no clue on how to solve them.

eng9
The White House has been home to many animals as well as presidents. (1 point) common noun proper noun compound noun collective noun

physics
A ship at sea is due into a port 600 km due south in two days. However, a severe storm comes in and blows it 200 km due east from its original position. How far is the ship from its destination?

College Algebra 1
Using the factoring method, solve for the roots of quadratic equation 4x^2=16

College Algebra 1
Factor by using the difference of two square formula 1-25z^2

static and dynamics
A box is at rest on a 34incline. what is the force of friction parallel to the ramp if box has a mass of 50-kg

probability
A bag contains 8 red, 12 white and 4 blue marbles. If 2 marbles are selected in succession (without replacement), find the probability as a common fraction in simplest form that first is red and second is blue

math
Thanks. That helps.

math
When the perimeter of an equilateral triangle is doubled, the result is 24. The length of a side of the original triangle is A. 4 B. 6 C. 8 D. 12

chemistry
A 52.3 kg sample of ethanol is needed for a reaction. What volume in liters of ethanol should be used? The density of ethanol is 0.789 g/mL

statistics
According to the MIT Airline Data Project, American Airlines controlled 15.5% of the domestic market in 2010. A random sample of 125 domestic passengers that year was selected. Using the normal approximation to the binomial distribution, what is the probability that more than ...

american government
With unfunded mandates, the national government?

american government
Nullification would have had the effect of returning the nation to the Article of Confederation because?

american government
The federal system can be thought of as a marble cake because?

Math
What's 25 inch by 12 1/2

Math
Your program has a proposed RDT&E-funded project scheduled to start in January 2005 which is expected to take 16 months to complete. The project is expected to cost a total of \$16 million (then-year dollars), with cost expected to be incurred at a rate of \$1 million per month...

Physics
Determine the electric force of a -8.0uc charge would experience when placed 14cm to the left of a 5.0uc charge. got 18N, but I'm not sure if I add the negative to the answer

Math
Write the quadratic function in standard form (if necessary) and sketch its graph. Identify the vertex. f(x)=x^2+3x+1/4

Engineering science
a 50kg mass is suspended from a spring, causing it to extend by 30mm. calceolate the spring stiffness? The mass is then pulled down a distance of 90mm and released. calculate the frequency of the resulting motion, assuming that this is simple harmonic, calculate the velocity ...

Finance
Pretty Lady Cosmetic Products has an average production process time of 40 days. Finished foods are kept on hand for an average of 15 days before they are sold. Accounts receivable are outstanding an average of 35 days, and the firm receives 40 days of credit on its purchases ...

Physics
Why is 5*10^3 multiplied by a electron charge?

correction
15m/s^2

Physics
A small charge that has lost 5.0 X 10^3 electrons and has a mass of 2.0 x 10^-6 kg experiences an acceleration of 15ms^2 when placed at a point P in space. Determine the magnitude and direction of the electric field at P

math
sqrt(350^2+400^2)=531.5ft 350+400= 750ft 750-531.5= 218.5ft The trip is 218.5ft shorter if you walk diagonally.

physics
sqrt(10^2+10^2)= 14.14m The total displacement is 14m North East

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