Saturday

October 25, 2014

October 25, 2014

Total # Posts: 508

**Math-Urgent help please.**

Two cards are selected, without replacing the first card, from a standard deck. Find the probability of selecting an ace (A), and then selecting a 4 (B): (choose 2) 0.603% 0.592 0.592% They are dependent events. 0.00592
*October 13, 2014*

**chemistry**

To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein molecule that is 7.00 nm in diameter? Take the mass of an electron to be 9.11&...
*October 12, 2014*

**Statistics-Help please??**

Given a mean of 25 and a standard deviation of 2.3, what is the z-score of a data value of 29? I don't understand the formula they gave me for the z-score, so I dunno where to start. /:
*October 8, 2014*

**math**

When Kaitlin divided a fraction by 1/2,the result was a mixed number.Was the original fraction less than or greater than 1/2? Explain your reasoning
*October 7, 2014*

**4th grade math**

explain the steps to extend number pattern?
*October 2, 2014*

**4th grade math**

explain what do you need to do to extend number pattern?
*October 2, 2014*

**Biology**

What is the water potential of a 5.7 L water in which 2.1 moles of NaCl has been dissolved at 30 degrees celcisus? Help please? Can you show work as well? It'll be greatly appreciated. Thanks in advance.
*September 27, 2014*

**physics**

2 point charges are located at the coordinates in the figure, how much work needs to move a point charge q = ]20ƒÊC from B to A? link to photo dropbox/s/x93u73xu2zslfqj/Untitled.png?dl=0
*September 11, 2014*

**physics**

4 same conductor balls with charge q = 40 ìC and mass m = 30g mare located at the corners of a square a = 30cm. Now let the charged ball move freely from the initial position. What the final speed the ball can reach?
*September 11, 2014*

**math**

How many liters of a 2.5% bleach solution must be mixed with a 10% bleach solution to produce 600 ml of a 5% bleach solution?
*September 8, 2014*

**math**

Belle had the choice of taking out a four year car loan at 8.5% simple interest or a Five year loan at 7.75% simple interest. If she borrows $15,000, how much interest would she pay for each loan? Which option requires less interest?
*September 8, 2014*

**math**

Order -3, 5, 16 and -10 from least to greatest. Then order the same numbers from closest to zero to farthest from zero. Describe how your lists are similar. Would this be true if the numbers were -3, 5, -16, and -10.
*September 4, 2014*

**math**

The least common multiple of two numbers is 60, and one of the numbers is 7 less than the other number. What are the numbers? Justify your answer. Any help would be greatly appreciated. Thanks in advance.
*September 4, 2014*

**algebra**

Yes that's how to do it, you find the midpoint.
*September 2, 2014*

**Math, Calculus**

The questions says it has 2 solutions. It wants me to find what x would be if cos(x)=-.49 and it is given that x is on the scale between 0 and 2pi. I know that cosine is the x value, and since cosime is negative in this case the two solutions need to be in the 2nd and 3rd ...
*September 2, 2014*

**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*

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