Wednesday

May 27, 2015

May 27, 2015

Total # Posts: 585

**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*

**Statistics**

Have you manged to solve this question ?
*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*

**physics**

0.5 m/s^2
*February 4, 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 - 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*

**psychology**

anterograde amnesia
*December 9, 2012*

**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*

**Calculus [Finding volume of solid]**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=x^2 y=0 x=3 about the y-axis
*November 30, 2012*

**Calculus [Finding volume of solid]**

Find the volume of the solid formed by rotating the region enclosed by x=0 x=1 y=0 y=4+x^5
*November 30, 2012*

**Calculus [rotation of region bounded by curves]**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=3x^2, x=1, y=0 about the x-axis
*November 30, 2012*

**Calculus: Help !**

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*

**grammar**

correct the grammar of the following text: Jason Turner thought he did the right thing when he had seen a man get into a car and drive off much too fast. A year earlier, another dangerous drive was injuring a friend of his, when he was knocking him off his motorbike. So Mr. ...
*November 20, 2012*

**Calculus [finding slope of tangent line]**

Find the slope of the tangent line to the curve 0x^2−2xy+2y^3=10 at point (-4,1) Help please? Thanks in advance
*November 18, 2012*

**physics**

A meterstick (L = 1 m) has a mass of m = 0.174 kg. Initially it hangs from two short strings: one at the 25 cm mark and one at the 75 cm mark.
*November 18, 2012*

**Math**

Find the slope of the tangent line to the curve 0x^2−2xy+2y^3=10 at point (-4,1) Help please? Thanks in advance
*November 17, 2012*

**Calculus [Implicit Differentiation]**

If √x+√y=10 and y(16)=36, find y'(16) by implicit differentiation. If somebody could please help me by explaining how to solve this problem ! Thank you (:
*November 17, 2012*

**Chemistry**

28
*November 16, 2012*

**Math**

The girls' high school basketball team played 12 games. They won 6 more games than they lost. Find the number of games the basketball team won.
*November 8, 2012*

**art**

How to make a concept about abstract painting
*November 6, 2012*

**Business English**

I have a positive attitude, even with boring tasks, I still get the job done./or I never complain. How can I phrase this into a more professional way? Thanks.
*October 30, 2012*