Friday
August 29, 2014

Posts by ali


Total # Posts: 493

Physics ...
Thank you very much .... Your a star
August 28, 2014

Physics ...
116In nuclei are produced at the rate of 10 s-1. Calculate the maximum number of 116In nuclei (number in equilibrium) in the sample if the half-life of 116In is 54 m. So far I have come up with ... The half life = 54m x 60 s-1 = 3.24 x 103 s-1 (In2) / λ = In2 / 3.24 x 10^...
August 28, 2014

science
116In nuclei are produced at the rate of 10 s-1. Calculate the maximum number of 116In nuclei (number in equilibrium) in the sample if the half-life of 116In is 54 m. So far I have come up with ... The half life = 54m x 60 s-1 = 3.24 x 103 s-1 (In2) / λ = In2 / 3.24 x 10^...
August 28, 2014

physics
116In nuclei are produced at the rate of 10 s-1. Calculate the maximum number of 116In nuclei (number in equilibrium) in the sample if the half-life of 116In is 54 m. So far I have come up with ... The half life = 54m x 60 s-1 = 3.24 x 103 s-1 (In2) / λ = In2 / 3.24 x 10^...
August 27, 2014

physics
THANK YOU .....
August 18, 2014

physics
Radioactive nuclei are produced in an irradiated sample at the rate of 10 s-1. If the number in the sample builds up to a maximum of 1000, calculate the mean life and the half-life of the radioactive nuclei Using dN / dt = P - λ N dN / dt = 1000n /10/ 1 = 100 P - λ N...
August 18, 2014

physics
the speed of pendulum is under root 0.91 and time period 1.8 sec what will be its time period in initial frame of reference
August 1, 2014

Chemistry
What is meant by 0.2mol (12g) of glacial acetic acid how can we make ?
July 21, 2014

mathe
Show that a right-circular cylinder of greatest volume that can be inscribed in a right-circular cone that has a volume that is 4/9 the volume of the cone.
July 12, 2014

Spanish
Can someone please check it for me and double check verbs and subjunctives are correct. Thank you, I really appreciate it.
July 6, 2014

Spanish
I doubt that there is any political issue that could be solved by just sitting around and not doing nothing about it. The world is facing many problems in this era. The most common ones are poverty, pollution and war. How is it possible that there are multi millionaire people ...
July 6, 2014

Spanish
Discuss your opinions and ideas about three different popular political issues. Include how you think things should be and what you wish certain people would do about it. Articulate your ideas on paper (one-page, typed) using the subjunctive.
July 6, 2014

chem school
calculate the volume of 2.04 m al l oh 3 needed to neutralize 22.0 ml of 880m h2so4
June 24, 2014

marketing
thanks
June 11, 2014

marketing
I need to find companies that are a small business under 20 employers to try to contact for meetings.do you know any companies that are a small business that are under 20 employers.
June 11, 2014

Math
Suppose you spin a spinner that is equally likely to land on any one of the numbers from 1 to 8. Which event has the same probability as P(not 2 or 3)?
May 21, 2014

math
sec( pi/7)-sec(2pi/7)+sec(3pi/7)
May 14, 2014

Aths
Suppose you are an astronaut spacewalking outside your spacecraft to repair a broken part. In fixing the part, you have drifted several meters from your spacecraft. You are now at rest and are still holding a bag filled with tools. How could you return to your ship?
May 11, 2014

Physics
A ball with a mass of 12 g is moving at 15 m/s. It collides with a second ball with a mass of 36 g moving at 5 m/s in the same direction. After the collision, the 12-g ball moves at 6.0 m/s. How great is the change in momentum of the z36-g ball?
May 11, 2014

chemistry
Calculate the molar it of a solution that contains 5.4 get of sodium sulfate dissolved in enough water to make 3.5 L of solution
May 6, 2014

CHEMISTRY HELP !!!!
a.) which of the following reactions should have the larger emf under standard conditions & why? CuSO4 (aq) + Pb (s) goes to PbSO4 (s) + Cu (s); Cu(NO3)2 (aq) + Pb(s) goes to Pb(NO3)2(aq) + Cu(s) b.) Calculate delta G for the reaction.
April 19, 2014

Calculus Help
I did put these answers in but they're marked wrong Thank you!
April 19, 2014

Calculus Help
A high-speed bullet train accelerates and decelerates at the rate of 4 ft/s2. Its maximum cruising speed is 90 mi/h. (Round your answers to three decimal places.) (a) What is the maximum distance the train can travel if it accelerates from rest until it reaches its cruising ...
April 19, 2014

Physics
A 77 kg window cleaner uses a 13 kg ladder that is 7.1 m long. He places one end on the ground 3.8 m from a wall, rests the upper end against a cracked window, and climbs the ladder. He is 3.9 m up along the ladder when the window breaks. Neglect friction between the ladder ...
April 16, 2014

chemistry help~~~~ Please!!!
how should the ph of a 0.1 m solution of nac2h3o2 compared with that of a 0.1 m solution of kc2h3o2?
April 10, 2014

Geometry
what is the formula of a base area for a right trapezoidal prism?
April 6, 2014

Chemistry
I am thrown off by this question because they dont give a molecule to work with. Also i don't know how i would work the acid... help! A 195 mL solution of a dilute acid is added to 102 mL of a base solution in a coffee-cup calorimeter. The temperature of the solution ...
March 29, 2014

physics
If the speed of the cart at the first photogate is 2.3 m/s, and the speed of the cart at the first photogate is 1.8 m/s, what is the percentage change in the speed of the cart (LEAVE OUT the % symbol)?
March 20, 2014

Calculus Please help!
Consider the function f(x)=4sqrt(x)+4 on the interval [2,5] . Find the average or mean slope of the function on this interval _______ <---A By the Mean Value Theorem, we know there exists a c in the open interval (2,5) such that f'(c) is equal to this mean slope. For ...
March 7, 2014

Calculus Please help!
f(x) -2x^3+2x^2-3x+2 Find the average slope of this function on the interval (–3–1) ________ <--A By the Mean Value Theorem, we know there exists a c in the open interval (–3–1) such that f'(c) is equal to this mean slope. Find the value of c in the ...
March 7, 2014

Physics
A 96.0-g wooden block is initially at rest on a rough horizontal surface when a 11.4-g bullet is fired horizontally into (but does not go through) it. After the impact, the block–bullet combination slides 6.5 m before coming to rest. If the coefficient of kinetic friction...
March 4, 2014

Chemistry
A solution is prepared by placing 27.8 g of KCl in a 0.700 L volumetric flask and adding water to dissolve the solid, then filling the flask to the mark. What is the molarity of an AgNO3 solution if 22.1 mL of the KCl solution react exactly with 43.0 mL of the AgNO3 solution?
March 2, 2014

Calculus Please help!
The linearization at a=0 to sqrt(1+2x) is A+Bx where A is____ and where B is _____? A=? B=? Ty
February 28, 2014

Calculus Please help!
The differential of the function y=(x^2+6)^3 is dy=______dx. When x=2 and dx=0.05, the differential dy=_______? A) dy=______dx? B) the differential dy=_______?
February 28, 2014

Calculus Please help!
Gravel is being dumped from a conveyor belt at a rate of 30 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always the same. How fast is the height of the pile increasing when the pile is 24 feet high? Recall that...
February 28, 2014

Calculus Please help!
At noon, ship A is 50 nautical miles due west of ship B. Ship A is sailing west at 18 knots and ship B is sailing north at 23 knots. How fast (in knots) is the distance between the ships changing at 3 PM? (Note: 1 knot is a speed of 1 nautical mile per hour.)
February 28, 2014

Calculus Please help!
The altitude of a triangle is increasing at a rate of 2500 centimeters/minute while the area of the triangle is increasing at a rate of 3500 square centimeters/minute. At what rate is the base of the triangle changing when the altitude is 7000 centimeters and the area is 87000...
February 28, 2014

Physics Please help!
If it requires 5.5J of work to stretch a particular spring by 2.3cm from its equilibrium length, how much more work will be required to stretch it an additional 4.5cm ? Express your answer using two significant figures. W=_____ J?
February 25, 2014

derivative (fg)'
This problem tests calculating new functions from old ones: From the table below calculate the quantities asked for (fg)'(–2) x 1 –17 0 –2 f(x) 3 –4335 0 0 g(x) 1 –10097 1 –17 f(x) 7 799 0 4 g(x) 3 1767 –1 27 (fg)'(–2) = ??? ty
February 22, 2014

Calculus Please help!
If 7000 dollars is invested in a bank account at an interest rate of 7 per cent per year. A) Find the amount in the bank after 6 years if interest is compounded annually? B) Find the amount in the bank after 6 years if interest is compounded quaterly? C) Find the amount in the...
February 21, 2014

Calculus Please help!
Use implicit differentiation to find the slope of the tangent line to the curve at the point (1,3) -4x^2+4xy-2y^3=-46 m=____? ty guys so much!
February 21, 2014

PLEASE HELP
ty
February 14, 2014

PLEASE HELP
For what values of a and b is the line –2x+y=b tangent to the curve y=ax^3 when x=–2? a= ? b= ?
February 14, 2014

Nuclear Radiation Technology
T1/2(Ra-226) = 1602 years What is the activity of 1 gram of Ra-226? Give the answer in Ci and Bq? What would be this activity after 1T1/2 and 5T1/2? Would appreciate if someone could show me how to do this question. Thanks.
February 3, 2014

economics
Consider a consumer who has an experienced utility function given by . Let denote the market price of good , and assume that it remains fixed throughout the problem. The company selling the good starts an advertisement campagin that has the following effect on the consumer: ...
January 22, 2014

physics
a 4.5kw electric motor is 90% efficient.how much energy it use in 20 seconds.
December 1, 2013

Chemistry
Why is the solubility of butane 6.1 mg / 100 g water, yet hexane is immiscible in water?
November 6, 2013

6th grade math
number 1 the answar is 5
October 29, 2013

physics
a large nuclear power plant generates electric energy at the rate of 1000 MW. how many joules of electricity does the plant generate in one day? what is the mass of this much energy?
October 25, 2013

math
what type of numbers is found an odd number of times in the table
October 23, 2013

Math
Central middle school sold 50 tickets for one night at the school play. Student tickets sold for 2$ each and adult tickets sold for 3$ each. They took in 135$. How many of each type of ticket did they sell?
October 23, 2013

Math
Central middle school sold 50 tickets for one night at the school play. Student tickets sold for 2$ each and adult tickets sold for 3$ each. They took in 135$. How many of each type of ticket did they sell?
October 23, 2013

Chemistry
Thank you so much!
October 22, 2013

Chemistry
So when solving this equation, we only use two of the reactants and not all three? And since there is more than one reaction, do we use the net ionic equations of both as the answer for this question or just one equation? So would the other reaction be this: CuCl2(aq) + Pb(NO3...
October 22, 2013

Chemistry
Solutions of potassium carbonate, copper(II) chloride, and lead(II) nitrate are each added to a beaker. Will any compound(s) precipitate from solution? Write a balanced net ionic equation for any precipitation reaction that occurs. I have gotten this so far: K2CO3(aq) + CuCl2(...
October 22, 2013

Water Treatment
100% 5 2
October 19, 2013

Chemistry
Emission Analysis of Aqueous Solutions of Groups IA and IIA Metal Salts A student records two potassium emission spectra: 1) one using 0.10 M KNO3 solution; 2) one using 0.10 M K2SO4 solution. Will significant differences be observed in the two emission spectra? Why or why not?
October 14, 2013

Chemistry
Identification of an unknown powdered metal by reaction with HCl: Why does the pH of the HCl solution initially increase very slowly when an unknown metal is first added to the acid solution, but gradually increase at a faster rate as the reaction proceeds to completion?
October 6, 2013

math
t is a 7-digit even number.there is no repetition of digits.the digit 5 is in in thousands place.the greatest digit is in millions place.the digit in the hundred thousands place is twice the digit in the hundreds place.the digit in the hundreds place is twice the digit in the ...
September 18, 2013

math
Tony is 1/2 of a mile ahead of Laura on a jogging path. If Tony is running at 5 miles per hour, and Laura is running at 7 miles per hour, how long will it take Laura to catch up with Tony?
September 12, 2013

Math
A particle travels along the curve c(t) = (6t^3-6, 7t^2-4). If time t is measured in seconds and if the coordinates are measured in meters, then what is the particle's speed at time t=5?
August 7, 2013

Math
Calculate the length of the path over the given interval: (sin6t, cos6t), 0<t<pi
August 7, 2013

Math
Calculate the length of the path over the given interval: c(t) = (3t^2, 4t^3), 2<t<5
August 7, 2013

Math
Use a formula for slope of a line tangent to a parametric curve to find dy/dx for the curve c(s) = (s^(-1)-6s, -7s^3) at the point with s=-4
August 6, 2013

Math
Calculate the length of the path over the given interval: c(t) = (3t^2, 4t^3), 2<t<5
August 6, 2013

Math
Calculate the length of the path over the given interval: (sin6t, cos6t), 0<t<pi
August 6, 2013

Math
A particle travels along the curve c(t) = (6t^3-6, 7t^2-4). If time t is measured in seconds and if the coordinates are measured in meters, then what is the particle's speed at time t=5?
August 6, 2013

Quantitative Reasoning for Business
If I made 12.40 and received a 3.5% increase what would my new salary be
July 21, 2013

Physics
5kg rock is dropped into a well and a splash is heard after 3 seconds , how deep is the well? Ignore air resistance
June 25, 2013

Eng
Its cc
May 27, 2013

physics
Obtain a symbolic expression for, 0<x<L/2,ea(x): 0<x<L,ea(x): Obtain a symbolic expression for the total elongation of the bar,   please help for these two problems.
May 1, 2013

Physics
52*10E-10Kg
April 28, 2013

chemistry
Where you find it anonyous?
April 26, 2013

chemistry
What is the osmotic pressure in torr of a 0.0155 M glucose solution at body temperature ( 35.7 °C)? What are the boiling and freezing points for the same solution?
April 22, 2013

chem com
3PbO + 2NH3 ---> 3Pb + N2 + 3H2O Based on the above balanced equation, If given 12.6 moles of NH3, how many moles of lead (Pb) will be produced
April 17, 2013

chem com
How many moles is 158.5 grams of CaCl2
April 17, 2013

chemistry
An activation energy of 2.0 eV is required to form a vacancy in a metal. At 800¡èC there is one vacancy for every 10^-4 atoms. At what temperature will there be one vacancy for every 1000 atoms?
April 15, 2013

Math
120 people are given a survey about which television shows they watch. ABC=55 NBC=30 CBS=40 ABC and CBS=10 ABC and NBC=12 NBC and CBS and ABC=5 It wants you to solve for the remaining regions of the circle (mainly what NBC+CBS equal). I know you have to make a venn diagram but...
April 10, 2013

Geometry
On these types of questions I always like to do the opposite of the FOIL (First Outer Inner Last) method. Since the first coefficient is 2 we know we have to have a 2x and an x and then the -5 at the end will result in only 5 and a 1 (one has to be postive and one has to be ...
April 10, 2013

Algerbra
A boat's crew rowed 10.5 miles downstream, with the current, in 1.5 hours. The return trip upstream, against the current, covered the same distance, but took 3.5 hours. Find the crew's rowing rate in still water, and the rate of the current.
April 10, 2013

world history
4 famous poet during Spain golden age ?
April 7, 2013

biology
(1) XA Xa (2) Xa Y (3) Xa Xa (4) XA Y (5) XA Xa (6) XA Y (7) XA Xa (8) XA Xa (9) XA X_ (10) Xa Y (11) Xa Y
April 7, 2013

MAH
It is simple, you have to see that at what stage the nominator gets divisible by denominator, because u dont want any left over. so it is sixth stage. 5/6 +5/6 + 5/6 +5/6 + 5/6 + 5/6 = 30/6 , you need 6 bags.
April 3, 2013

chemistry
Don't forget just Arsenate, which is AsO4-3. That's the missing piece.
March 23, 2013

uhar
two blocks a and b are connected by a cord passes over a frictionless pulley. the mass of a is 1.2 kg and the magnitude of acceleration is 3.6
March 21, 2013

math
1/4
February 21, 2013

Math - Quadratic
a. 1 b. 0.2 c. -11
February 19, 2013

discrete
we have 20 kinds of presents. we want to give 12 children presents but each child doesn't need to get one. No child can get 2 copies of the same present. in how many ways can we give presents? please explain! the answer is (2^20)^12 but i dont see why
January 31, 2013

Chemisty
Determine how many calories are need to heat 30 grams of water from 10 degrees C to 30 degrees C
January 30, 2013

chemistry
What volume of 9.0Molarity of H2SO4 is required to react with 20.0g of NaOH?
January 26, 2013

8th grade science
write an advertisement that you could use to sell copies of Mendeleev's periodic table to chemists in 1869. Be sure to emphasize the benefits of the table to the chemical profession. Remember, the chemists have never seen such a table. i want you to give me an advertisement.
January 22, 2013

science 8th grade
give me an advertisement
January 15, 2013

science 8th grade
write an advertisement that you could use to sell copies of Mendeleev's periodic table to chemists in 1869. Be sure to emphasize the benefits of the table to the chemical profession. Remember, the chemists have never seen such a table.
January 15, 2013

math
4 pounds
January 15, 2013

physics
GET YOUR OWN DAMN HELP TRICK!
January 15, 2013

k park
how much heat must be removed froms 20 g of water at 130 c to make 20 g water at -22 c
January 14, 2013

muniz
how much heat must be removed from 20g of water at 130 c to make 20 g water at -22 c
January 14, 2013

physics
sphere A has a mass of 4.2*10^-2 kg and is tethered to a wall by a thin thread. Sphere a has an excess of 1.2 *10^12 electrons. Sphere B has a deficit of 3.5*10^12 electrons and is o.23 m from sphere A a) determine the angle between the thread and the wall b) determine the ...
January 12, 2013

Cell Biology
1. Which molecule is the major contributor to the increase in mass observed in a full grown plant (i.e. tree) compared to a plant seed? I'm thinking it could be either of these three: D-glucose, C02, or H20.. help?
December 8, 2012

Math [Consumer Surplus]
The demand function for a certain brand of blank digital camcorder tapes is given by p=−0.02x^2−0.1x+24 where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. Determine the consumers' surplus if...
November 30, 2012

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