Sunday

April 19, 2015

April 19, 2015

Total # Posts: 947

**biology**

Which of the following amino acids has a side chain that carries a negative charge in its conjugate base form? A. H B. W C. C D. K E. N
*January 16, 2013*

**physics**

The largest-caliber antiaircraft gun operated by the German air force during World War II was the 12.8 cm Flak 40. Suppose this weapon fired a 26.2 kg shell with a muzzle speed of 800 m/s. What propulsive force was necessary to attain the muzzle speed within the 6.00 m barrel...
*January 6, 2013*

**Physics**

Find the speed, v, of a pendulum at the bottom of its swing (B), given that it has mass m and initial height at A is h (the difference in height from B to A). Your answer will be in terms of g as well. Included is a drawing of a pendulum at its maximum height (A), and at its ...
*December 27, 2012*

**Linear Algebra**

Can you perform using matrix? Thank you very much
*December 18, 2012*

**Linear Algebra**

Consider the system x-2y=k-1 4x+(1-k^2)y=8 For what values of k does the system have a. unique solution? b. infinitely many solutions? c. no solution?
*December 18, 2012*

**math steve**

steve can you explain step by step please 8x=5y and 3y=14z then 12x= how many z's
*December 9, 2012*

**math**

if 8x=5y and 3y=14z then 12x= how many z's
*December 9, 2012*

**calculus**

A 100 inch piece of string is cut into 3 pieces. One piece forms a circle, one forms a square and 1 forms an equilateral triangle. If the perimeter of the triangle is equal in length to the perimeter of the square how long should each piece of string be to minimize the total ...
*November 19, 2012*

**math**

compare two cell phone companies and determine which is the better deal. Needs to be in a y=mx+b equation for each company. company a $40 base rate plus every minute costs .05 company b base rate $30 plus every minute costs .07 based on 800 minutes PLEASE HELP ME ASAP!
*November 18, 2012*

**Chemistry Help**

Write a balanced equation for the reaction between an aqueous solution of calcium nitrate being mixed with an aqueous solution of sodium phosphate Identify the precipitate.
*November 14, 2012*

**Finance**

Arena Distributors is a new company and currently pays no dividends. The company has just reported earnings of $1.5 per share and its earnings are expected to grow at a 15 percent annual rate over the next four years. Following this four-year high growth period earnings will ...
*November 14, 2012*

**Finance**

Seven years ago a semi-annual coupon bond with a 10% coupon rate, $1,000 face value and 15 years to maturity was issued by Corn Inc.. Teddy bought this bond two years ago when the market interest rate was 12%. And now the market interest rate is 5%. If teddy sells the bond now...
*November 14, 2012*

**math URGENT!!!!!!!!!!!!**

a 12x12-inch square is divided into n^2 congruent squares by equally spaced lines parallel to its sides. circles are inscribed in each of the squares. find the sum of the areas of the circles. answer and please explain step by step how u got the answer!! please!!!!
*November 12, 2012*

**com sci**

A rational number is the form of a/b, where a and b are integers with b != 0. Develop and test a class for processing rational numbers. The class should have a numerator data member and a denominator data member. It should read an display all rational numbers in the format a/b...
*November 12, 2012*

**physical**

to strengthen his arm and chest muscles, an 82-kg athlete who is 2.0 m tall is doing push ups. his center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0cm from the top of his head. find the force that the floor exerts on each of is feet ...
*November 8, 2012*

**Physics**

Which one of the following stresses would be most likely to cause a bone to fracture? A) tensile stress B) compressive stress C) sheer stress D) bulk stress
*November 7, 2012*

**math URGENT!!!!!!!**

a rectangular sheet of paper is folded in half, with the crease parallel to the shorter edge. it happens that the ratio of longer side to shorter side remains unchanged. what is this ratio? answer this and explain how u got the answer.. PLEASE??!
*November 7, 2012*

**Computer Science**

Overview The purpose of the assignment is to develop a basic understanding and skills programming of input/output ports and device polling. The assignment examines hardware polled input from a push button. Assignment 1 The assignment is based on the flashing LED of the MSP430 ...
*November 5, 2012*

**math**

Alexa and Emma are looking up at their house from the backyard. From alexa's point of view, the top of the house is at an ang;e of elevation of 40 degree. From Emma's point of view, directly closer to the house, it is 60 degree. The house is 15 metres high. How far ...
*November 2, 2012*

**math URGENT!!!!**

please show how u got the answer
*October 29, 2012*

**math URGENT!!!!**

i have a list of 5 different numbers. the sum of 2 of the numbers is 0. the sum of 2 of the numbers is 1. the sum of 2 of the numbers is 2. the sum of 2 of the numbers is 3. the sum of 2 of the numbers is 4.the sum of 2 of the numbers is 5.the sum of 2 of the numbers is 6. the...
*October 29, 2012*

**math..reiny..help!!**

is that the area of big or small triangle?
*October 25, 2012*

**math URGENT!!!!**

the midpoints of the sides of a triangle are (1,1),(4,3),and (3,5). find the area of the triangle. please answer and show how u did it step by step please!!!! how do i find area of the smaller triangle?
*October 25, 2012*

**math URGENT!!**

so is that the area of big triangle or small?
*October 25, 2012*

**math URGENT!!**

how do i find the area of the little triangle? Reiny,
*October 25, 2012*

**math URGENT!!**

the midpoints of the sides of a triangle are (1,1),(4,3),and (3,5). find the area of the triangle. please answer and show how u did it step by step please!!!!
*October 25, 2012*

**Trig**

From a point 120 feet from the base of a plant building the angle of elevation to the roof line of the building is 38 degrees. The angle of elevation to the top of an antenna is 43 degrees. The antenna is attached to the nearest edge of the roof and the ground is flat. The ...
*October 24, 2012*

**mathURGENT!!!!**

the midpoints of the sides of a triangle are (1,1),(4,3),and (3,5). find the area of the triangle. what is the answer and can u explain how u got it step by step? please...
*October 22, 2012*

**math**

42 is evenly divisible by both 6 and 7
*October 22, 2012*

**math URGENT!!**

a rectangular box measures 4 by 5 by 2 meters. what is the length of the longest pole that can fit into the box?
*October 15, 2012*

**math**

how did u get that?
*October 15, 2012*

**math**

a rectangular box measures 4 by 5 by 2 meters. what is the length of the longest pole that can fit into the box?
*October 15, 2012*

**math**

amee, ben, carly, and darrien are friends. darrien has no money. amee gives darrien 1/4 of her money. ben gives darrien 1/5 of his money. carly gives darrien 1/3 of her money. each person gave darrien the same amount. what fraction of the groups total money does darrien have ...
*October 8, 2012*

**7th grade math**

b) 2 7/8 inches
*October 8, 2012*

**Chemistry! Test tomorrow, pls help !**

hi
*October 4, 2012*

**Math does anyone know this?**

they are parallel....two nonvertical lines are parallel if their slopes are equal and have different y intercepts..
*October 3, 2012*

**math - still don't get it**

your welcome! anytime :)
*October 3, 2012*

**math - still don't get it**

because as long as the number(4) is right after the decimal point it doesnt matter how many 0's are in front of decimal or after the 4. think of it in dollar amount 0.4 is 0dollars and 40 cents. .40 is still 0 dollars and 40 cents thus 0.4=.40 if it were a different number...
*October 3, 2012*

**math**

its equal to...
*October 3, 2012*

**math**

can u explain that a little further steve?
*October 3, 2012*

**math**

describe the picture you would get by graphing the solutions(if there are any!) to the equation (x+y)^2=x^2+y^2
*October 3, 2012*

**math**

there are 15 boys and 18 girls in fifth grade. Find the ratio of boys to girls in fifth grade.(how do I get the answer) can someone show me how to work the problem
*October 1, 2012*

**Physics**

12 ft
*September 30, 2012*

**math**

is there an equation for this?
*September 24, 2012*

**math**

an object released from rest will fall 16t^2 feet, t seconds after it is dropped. 2 pebbles are dropped, one after the other, from a cliff that is 64 feet high. the 2nd pebble is released the instant the first pebble has fallen exactly one foot. how far above the ground is the...
*September 24, 2012*

**math**

consider the equation x^2+kx+1=0 a single fair die(dice)is rolled to determine the value of the middle coefficient, k. the value for k is the number of dots on the upper face of the die. what is the probability that the equation will have real, unequal roots?
*September 19, 2012*

**Physics**

A falling iPad takes 0.15 s to travel past a window 2.7 m tall. From what height above the top of the window did the mobile device fall? Equation to use?
*September 17, 2012*

**Physics**

A falling iPad takes 0.15 s to travel past a window 2.7 m tall. From what height above the top of the window did the mobile device fall? What equation would I use for this?
*September 17, 2012*

**trigonometry**

Suppose θ is an angle in standard position whose terminal side lies in Q II. If sin θ = 13 12 , find sec θ.
*September 17, 2012*

**physics**

An airplane flies 200 km due west from city A to city B and then 270 km in the direction of 31.0° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A? (b) Relative to city A, in what direction is city C?
*September 13, 2012*

**physics**

An airplane flies 200 km due west from city A to city B and then 270 km in the direction of 31.0° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A? (b) Relative to city A, in what direction is city C?
*September 13, 2012*

**physics**

A river flows due east at 2.00 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 11.0 m/s due north relative to the water.
*September 13, 2012*

**Math**

1. b 2. c 3. c 4. a
*September 13, 2012*

**physics**

A 5.21 box sits on a ramp that is inclined at 37.8 above the horizontal. The coefficient of kinetic friction between the box and the ramp is 0.29. What horizontal force is required to move the box up the incline with a constant acceleration of 4.00 ?
*September 12, 2012*

**math**

malik paid 480$ to purchase a certain number of pizzas, but 2 extra were delivered which decreased the amount per pizza by 1$. how many pizzas were delivered?
*September 12, 2012*

**math**

Computers manufactured by a certain company have a serial number consisting of a letter of the alphabet followed by a five-digit number. If all the serial numbers of this type have been used, how many sets have already been manufactured?
*September 11, 2012*

**economics**

Say your parents give you a car for your birthday. It is not the new model you wanted, but it's in very good condition. They bought it used for $15,000 (market value). The cost of keeping the car to you is (not counting maintenance and operation cost) is:
*September 2, 2012*

**economics**

Say your parents give you a car for your birthday. It is not the new model you wanted, but it's in very good condition. They bought it used for $15,000 (market value). The cost of keeping the car to you is (not counting maintenance and operation cost) is:
*September 2, 2012*

**accounting**

A company purchased a machine on January 1 of the current year for $750,000. Calculate the annual depreciation expense for each year of the machine's life (estimated at 5 years or 20,000 hours, with a salvage value of $75,000). During the machine's 5-year life its ...
*August 25, 2012*

**health**

Thank you very much Ms.Sue really appreciate it:)
*August 13, 2012*

**Physics**

When a resistor is connected across the terminals of an ac generator (112 V) that has a fixed frequency, there is a current of 0.500 A in the resistor. When an inductor is connected across the terminals of this same generator, there is a current of 0.400 A in the inductor. ...
*August 5, 2012*

**Physics**

When a resistor is connected across the terminals of an ac generator (112 V) that has a fixed frequency, there is a current of 0.500 A in the resistor. When an inductor is connected across the terminals of this same generator, there is a current of 0.400 A in the inductor. ...
*August 3, 2012*

**math**

Oops I was thinking of 8 times 9 It's 126
*July 29, 2012*

**math**

Planets A, B and C orbit a certain star once every 3, 7, and 18 months respectively. If the three planets are now in the same straight line, what is the smallest number of months that must pass before they line up again?
*July 29, 2012*

**PHY: To AJAYB, follow up on previous response**

First, I'd like to thank you for your response to my question. However, I had some follow up questions on your response from Saturday, July 28, 2012 at 8:27am. If you could take a look at that post and get back to me, it would be greatly appreciated.
*July 29, 2012*

**Physics- Repost (Answer did not make sense)**

Thanks for your response, but I have a few questions. For part B, why is full battery voltage 6V, and not 12V? For part C, my question is once again about using 6V in the calculation for finding q0, as well as units. Using 6V, qo= 54 uC? For the time constant, I plugged in ...
*July 28, 2012*

**Physics- Repost (Answer did not make sense) **

In the circuit below, at time t = 0, the switch is closed, causing the capacitors to charge. The voltage across the battery is 12 V The circuit: flickr. com/photos/ 68751220@N03 /6848519773/ A)Calculate the time constant for the RC circuit B)Calculate the time required for the...
*July 28, 2012*

**physics**

I plugged the #'s into that site you supplied, but I still get my answer of 0.012 seconds, not the 1.2E-5 seconds you put?
*July 27, 2012*

**physics**

I meant 0.012 sec for part A
*July 27, 2012*

**physics**

In the circuit below, at time t = 0, the switch is closed, causing the capacitors to charge. The voltage across the battery is 12 V The circuit: flickr. com/photos/ 68751220@N03 /6848519773/ A)Calculate the time constant for the RC circuit B)Calculate the time required for the...
*July 27, 2012*

**Physics**

The work done by an electric force in moving a charge from point A to point B is 3.75 x 10^-3 J. The electric potential difference between the two points is VA - VB = 54.6 V. What is the charge? Not sure if I did this correctly: I believe this is an equation: deltaV= (-Wab)/q ...
*July 25, 2012*

**physics**

An object carries a charge of -8.0 uC, while another carries a charge of -2.0 uC. How many electrons must be transferred from the first object to the second so that both objects have the same charge? Qavg = (object 1 + object 2)/2 Qavg= -5uC Object 2- Qavg = 3uC 3E-6 C/1.6E-19...
*July 23, 2012*

**Physics**

Those "i" things before the "C" were supposed to be micro for microcoulombs
*July 23, 2012*

**Physics**

An object carries a charge of -8.0 ìC, while another carries a charge of -2.0 ìC. How many electrons must be transferred from the first object to the second so that both objects have the same charge? Qavg = (object 1 + object 2)/2 Qavg= -5ìC Object 2- Qavg...
*July 23, 2012*

**chemistry 12**

hey i was wondering, i have this question: Sketch a pH curve for the titration of 40.00mL of 0.100 M hydrazine, H2NNH2, having a K of 3.0x10^-6 by 0.100 M HCIO4 i know you can t sketch but could you tell me what to do with the "K of 3.0x10^-6" i could sketch the ...
*July 17, 2012*

**MAth**

A rectangle is 15 inches long and 6 inches wide. What is the area of the rectangle?
*July 14, 2012*

**Math**

If triangle ABC is similar to triangle DEF and the perimeter of ABC is 4 times greater than the perimeter of DEF , what is the relationship between the areas of the triangles?
*July 12, 2012*

**Physics**

You are explaining why astronauts feel weightless while orbiting in the space shuttle. Your friends respond that they thought gravity was just a lot weaker up there. Convince them and yourself that it isn't so by calculating the acceleration of gravity 248 km above the ...
*July 8, 2012*

**math**

Solve the following problems using Partial Quotients a. 7752/17 b. 651/3
*July 7, 2012*

**math**

The number of dogs and chickens on a farm add up to 14. The number of legs between them is 36. How many dogs and how many chickens are on the farm if there are at least twice as many chickens as dogs?
*June 13, 2012*

**math**

Find the sum of the arithmetic progression 4 + 9 + 14 + 19 + …….94 + 99 + 104
*June 13, 2012*

**sceince**

close, you need to change your theta. A) 250(1.7)cos35 B) 250(3.2)cos55 this will work, just did it for my homework and they are correct. My E and A are different but the theta was the same.
*June 10, 2012*

**Finance**

John Jones buys a flat screen TV costing $1200. He pays $200 down and finances the balance at 15% add-on interest, to be repaid in 18 monthly installments. Find the finance charge
*May 27, 2012*

**AP CHEMISTRY**

Thank you very much
*May 27, 2012*

**AP CHEMISTRY**

Please could you help me predict the products of the following reactions: ( I cant figure them out) THANX in advance! 1) CaO powder is added to distilled water. 2) Acetic acid solution is added to solid sodium hydrogen carbonate. 3) Potassium permanganate solution is added to ...
*May 27, 2012*

**math**

If E and F are events with P ( E ∩ F ) = 0.09 and P ( E F ) = 0.3 , P ( F E ) = 0.4 Find P (F )
*May 25, 2012*

**ALGEBRA II**

ln(x+5)=4 COULD YOU SHOW HOW TO SOLVE THIS STEP BY STEP. THANX!
*May 23, 2012*

**Physics**

Sorry - got cut off. I meant to supply R * V(rel) = Ma
*May 22, 2012*

**Physics**

A railroad car moves under a grain elevator at a constant speed of 3.70 m/s. Grain drops into the car at the rate of 580 kg/min. What is the magnitude of the force needed to keep the car moving at constant speed if friction is negligible? F = Ma -> R * V(rel)
*May 22, 2012*

**US HISTORR**

why did the league of nations not pursue italy? Like after WW2. Did the Italians get angry because of something the league of nation did or didn't do for them ?
*May 21, 2012*

**US HISTORY**

why did the league of nations not pursue italy? Thanx!
*May 21, 2012*

**US HISTORY**

thanx!
*May 21, 2012*

**US HISTORY**

what decided the outcome of the 2000 election??
*May 21, 2012*

**AP CHEMISTRY**

Thanx!!!
*May 20, 2012*

**AP CHEMISTRY**

What does a negative value for a standard potential indicate? PLEASE HELP!!
*May 20, 2012*

**CHEMISTRY**

yeah i get that, and so what would you write acetic acid as, just the same?? And also thanx for explaining above
*May 13, 2012*

**CHEMISTRY**

Write the formulas for the following substances as they would appear in a total ionic equation: a) Aqueous acetic acid b) solid lithium carbonate c) Aqueous ammonia d) Aqueous sodium dihydrogen phosphate I don't know, do we have to write the formula [like ammonia is NH3] ...
*May 13, 2012*

**CHEMISTRY**

Use the solubility rules to predict whether the following substances are soluble or insoluble in water: a) K2CrO4 _______________ b) NiSO4 _______________ c) Cu(OH)2 ______________ d) Pb(C2H3O2)2 __________ e) Ag2CO3 _______________ f) Al2S3 ________________ Please help me ...
*May 13, 2012*

**physics**

An 21.0 , 12.0 , and 5.0 resistor are connected in series with an emf source. The current in the 12.0 resistor is measured to be 4.00 A.
*May 10, 2012*