Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 819

**chemstry**

How long will it take 200 mg of carbon-14 to decay to the point where only 75 mg remain if the half-life is 5770 years?
*October 31, 2013*

**math**

As dry air moves upward it expands and in doing so cools at a rate of 1 degrees Celsius for each 100 m rise up to about 12 km If the ground temperature is 20 degrees Celsius find an expression for the temperature T as a function of the height H the answer is T=20-10h(h in ...
*October 30, 2013*

**Solar Energy Please Help**

No Ratan, C is the same with A..... 25.2Volt, due to no Voltage drop. This is the correct.
*October 26, 2013*

**Solar Energy Please Help**

When you conect cells in series... the total voltage is CellV*number of cells. The current remain the same. without losses, the voltage remain the same.
*October 26, 2013*

**Algebra**

Do side lengths 30, 18 and 24 form a right triangle? How did you figure it out?
*October 22, 2013*

**Algebra**

If a circle has an area of 49pi what is the radius of the circle?
*October 22, 2013*

**Algebra**

Consider a circle with a radius of 3m. Joe thinks the area of the circle is 3m^pi. Do you agree with Joe? Why or why not?
*October 22, 2013*

**Math (Algebra 1)**

How do I find the volume of a cylinder that has a diameter of 8 and a height of 6?
*October 20, 2013*

**Math (Algebra 1)**

How do I solve this problem for x? a(-3x + 1) + 4 = -30
*October 19, 2013*

**Math (Algebra 1)**

Consider the ages of 5 brothers: 32, 26, 28, 30, 28. Determine which of the following are true if a new brother is adopted at age 10. A) The median will decrease B) The mean will decrease C) The range will increase D) The standard deviation will decrease Please explain how you...
*October 19, 2013*

**Math (Algebra 1)**

How do I combine the following like terms? 4+2(-x+1)-5(x-1) I have the answer - 11-7x - but I need to know how to show my work in this problem. Thanks.
*October 19, 2013*

**ET3034TUx Solar Energy**

0.674
*October 16, 2013*

**physics**

How many photons of visible light result if a 60-keV x-ray photon is converted into green visible light with 10% efficiency?
*October 15, 2013*

**Physics**

High-speed motion pictures (3500frames/second) of a jumping 280ìg flea yielded the data to plot the flea's acceleration as a function of time as shown in the figure (Figure 1). This flea was about 2 mm long and jumped at a nearly vertical takeoff angle. Find the ...
*October 10, 2013*

**Math**

Determine the range of each function a)f(x)=(x^2+3)^2,XER Answer is f(x)ER, f(x)>9 b)f(x)=1/3+x^4,XER Answer is f(x)ER, 0<f(x)<1/3 Please explain how they go those two answers
*October 7, 2013*

**math**

A recipe call for 3/4 cups of flour for a batch of cookies. Phillip makes 2 1/2 batchers. How much flour will he use
*September 18, 2013*

**social studies**

anybody got anything on number 3?
*September 5, 2013*

**college algebra**

how to solve this x^2-14+49=16
*August 29, 2013*

**math**

David id "d" years old. In d/5 years, Marco will be twice as old as david is now. What is Marco's age now in terms of d? A. 11d/5 B. 9d/5 C. 4d/5 D. 7d/10 E. 3d/10
*August 13, 2013*

**Physics**

Two resistors 10 Ω and 5 Ω are connected in parallel across a 15 V battery. What is the potential difference across the 10 Ω resistor? Answer 5 V 10 V 15 V 20 V I did the work as follows: 1/Req = 1/10 + 1/5. 1/Req = 0.3/1. Req(0.3) = 1(1). Req = 3.33 ohm. Then, ...
*July 13, 2013*

**Physics**

Which of the following is correct for the reflected ray if a light ray strikes a plane mirror at an angle of 50° from the normal? a. 40° from the surface of the mirror b. 40° from the normal c. 50° from the surface of the mirror d. 90° from the normal I ...
*July 12, 2013*

**Science**

A lorry has a mass of 5640kg and accelerates uniformly from rest to reach a velocity of 100km/h in 10s. Determine the acceleration of the lorry. Determine the force needed to accelerate the lorry
*June 21, 2013*

**Engineering science **

A lorry has a mass of 5640kg and accelerates uniformly from rest to reach a velocity of 100km/h in 10s. Determine the acceleration of the lorry. Determine the force needed to accelerate the lorry
*June 21, 2013*

**Chemistry**

What about the a? The graph below shows two conductivity curves with respect to temperature of a germanium semiconductor. In one case, there is dopant added to the sample, and in the other there is none. Using some or all of the labels below, please drag and drop the labels to...
*June 1, 2013*

**chemistry**

4.35
*June 1, 2013*

**chemistry**

pKa+log10(10^2)= 2.35+2= 4.35
*May 31, 2013*

**Math**

If a pencil costs 300% more than an eraser and the eraser costs 25 cents, what is the cost of the pencil?
*May 24, 2013*

**math **

If I am 25% taller than you, then you must be 75% shorter than me 25% shorter than me 20% shorter than me 75% of my height
*May 9, 2013*

**math **

You want to explain to your friend that your bank’s interest rate has gone down from 1.2% to 0.3%. Which sentence below has the correct meaning? A)My interest rate has decreased 25%. B)My interest rate has decreased 0.9 percentage points. C)My interest rate is 0.9% of ...
*May 9, 2013*

**physics**

The distance between two planets is 1.6 x 10^6 m. How much time would the light signal take to go from one planet to the other?
*May 9, 2013*

**Calculus help please!**

Find the Antiderivative of 3/(3x+5) with steps
*May 3, 2013*

**Calculus**

Find the Antiderivative of 3/(3x+5) with steps
*May 2, 2013*

**poetry**

What sound devices are used in the poem "How I Learned English" I also need the examples of the sound devices used.
*April 17, 2013*

**university of phoenix**

bond that has a$1000 par value and a contract interest rate of 10.1%.The bonds have a current market value of $1,120and will mature in 10 years.The firms marginal tax rate is 34%
*April 16, 2013*

**Chemistry**

What are ways in which pka values for weak acids can be experimentally determined?
*March 30, 2013*

**Chemistry**

What are some equilibrium expressions that chemists use for weak acid equilibrium?
*March 30, 2013*

**Chemistry**

What are some equilibrium expressions that chemists use for weak acid equilibrium?
*March 30, 2013*

**Physics**

The load-bearing piston in a certain hydraulic system has an area 35 times as large as the input piston. If the larger piston supports a load of 9000 N, how large a force must be applied to the input piston?
*March 30, 2013*

**Math**

if 4/3 x 3/4 =5k whats k
*March 28, 2013*

**math**

8 c
*March 27, 2013*

**Math**

If you are riding a bike and your front sprocket (the one with the pedals) has 40 teeth and the rear sprocket (the one connected to your back tire) has 20 teeth, and you are pedaling at a rate of 50 rpm, how fast are you going if your bike has 27 inch diameter wheels?
*March 22, 2013*

**math**

If two rectangles have 16 inches what are two possible areas for each rectangle
*March 19, 2013*

**Chemistry - URGENT**

I had to type it in word and it formatted fine even when i emailed it to myself. So how do you calculate the rate constant?
*March 16, 2013*

**Chemistry - URGENT**

For 1 I got m is .282 and for 2 I got n is .53
*March 16, 2013*

**Chemistry - URGENT**

I figured out 1 and 2 but i dont understand how to do the rest
*March 16, 2013*

** Chemistry - URGENT**

So, I go to high school in Texas and we have this AP Chem lab due online tomorrow night by midnight and I need some serious help on these questions: Lab Temp 0.2°C Experiment Trial Time in seconds Trial 1 Trial 2 Average Time 1 1 2 ...
*March 16, 2013*

**Chemistry - reaction kinetics **

So, I go to high school in Texas and we have this AP Chem lab due online tomorrow night by midnight and I need some serious help on these questions: Lab Temp 0.2°C Experiment Trial Time in seconds Trial 1 Trial 2 Average Time 1 1 2 ...
*March 16, 2013*

** Chemistry**

So, I go to high school in Texas and we have this AP Chem lab due online tomorrow night by midnight and I need some serious help on these questions: Lab Temp 0.2°C Experiment Trial Time in seconds Trial 1 Trial 2 Average Time 1 1 2 256 275 268 ...
*March 16, 2013*

**Chemistry AP**

It was determined that a 0.10 M solution of an acid was only 2.5% ionkzed. Find the Ka and pKa for the acid.
*March 16, 2013*

**Chemistry**

2A(aq)-> B(aq) +C(aq) Initial concentration of A and B is 1.00 M, with no C. Kc = 0.200 find equilibrium concentrations
*March 15, 2013*

**physics**

wonder waves in shallow yellow dA.isc are 6.0 cm long. at one point, the water oscillates up and down at a rate of 4.8 of oscillations per second. A. what is the speed of the water waves? B. what is the period Of water waves?
*March 12, 2013*

**physics**

wonder waves in shallow yellow disc are 6.0 cm long. at one point, the water oscillates up and down at a rate of 4.8 of oscillations per second
*March 12, 2013*

**algebra**

√5 ____ √45 How do you simplify this. Do you multiply the top and bottom by the square root of 45
*March 7, 2013*

**4th grade Algebra**

Evaluate each expression when n = 75 12n 36n is that multiplication?
*March 7, 2013*

**Business Math **

If Wilma borrows $5,000 from her brother (at 5% interest per year) and the loan matures in 10 years, how much will she have to pay annually to pay the loan off in 10 years? How much will she have to pay annually to pay the loan off in four years?
*February 17, 2013*

**Maths **

The ratio John's age to Ryan's age is 3:1 now . 25 years later , the ratio will become 4:3 .How old is John now ?
*February 15, 2013*

**Maths **

The ratio John's age to Ryan's age is 3:1 now . 25 years later , the ratio will become 4:3 .How old is John now ?
*February 15, 2013*

**Math**

A dining room floor has an area of 52 yards. Alice wants to cover 3/4 of the floor with carpet. How many 4 square yards of carpet does she need?
*February 13, 2013*

**Physics **

Suppose that the gravitational acceleration on a certain planet is only 3.1 m/s2. A space explorer standing on this planet throws a ball straight upward with an initial velocity of 25 m/s. (a) What is the velocity of the ball 4 seconds after it is thrown? m/s (b) How much time...
*February 13, 2013*

**Math I need help Please help me!!!!!!**

The answer is- D. About 349 feet per hour
*January 30, 2013*

**Information Literacy**

Which of the following sets of Library of Congress call numbers is in the correct order? A. E88 G2512 S57 1998, E88 G62 D225, E88 G62 L166 1995, E88 G62 L45 B. E88 G62 L166 1995, E88 G62 L45, E88 G62 D225, E88 G2512 S57 1998 C. E88 G2512 S57 1998, E88 G62 D225, E88 G62 L45, ...
*January 12, 2013*

**Chemistry**

b= 8.8279*10^-20 in joules
*January 12, 2013*

**Chemistry**

It still wrong answer.
*January 11, 2013*

**Anthropology**

The difference between a state and a cheifdom is?
*December 9, 2012*

**math **

you borrow $1200 from a bank that bank charges 9.5% simple annual interest. after 15 months you pay back the loan. how much interest do you pay on the loan? what is the total amount that you pay the bank.
*December 6, 2012*

**Physics**

A boy is standing on a skateboard holding two 5.0 kg bowling balls. Initially they are moving to the left at a speed of 3.0 m/s. At one point the boy throws one ball to the right at 4.0 m/s causing his speed to increase. Before he can slow down, he throws the second ball to ...
*November 29, 2012*

**AP Psychology**

Elevating Arousal and Mood
*November 1, 2012*

**Physics**

35 cm
*October 31, 2012*

**physics**

A long thin rod is cut into two pieces, one being as long as the other. To the midpoint of piece A, piece B is attached perpendicularly, in order to form the inverted "T" shown in the figure. The application of a net external torque causes this object to rotate about...
*October 27, 2012*

**math**

The LCM of these three numbers is 60. The GCF is 1. If you add the numbers, the sum is 15. Select the three numbers from the following options: 2, 6, 5, 8, 4 Show your work!
*October 17, 2012*

**Physics**

A pendulum 1.70m long is released (from rest) at an angle 30 degrees. 1. Determine the speed(m/s) of the 60.0g bob at Theta = 15. 2. Determine the tension in the cord at the lowest point Theta = 0. 3. Determine the tension in the cord at Theta = 15. A formula would be ...
*October 17, 2012*

**CHM**

Calculate the percent ionization of hydrazoic acid (HN3) in solutions of each of the following concentrations A) 0.377 M B) 0.107 M C) 4.16*10^-2 M Ka= 1.9*10^-5
*October 8, 2012*

**Calc**

Whats the derivative of 2x^2*tan(X)/sec(x) ?
*October 4, 2012*

**physics**

Suppose runner A starts at the 0 degree mark on a circular track (circumference = 400m). And let runner B start at the 180 degree mark. If runner A starts running counter clockwise with acceleration 2m/s^2, and runner B runs clockwise with constant speed of 7 m/s, at what ...
*October 2, 2012*

**math**

there are 5 people.Each person has 1 hat.How many are in all.4
*October 1, 2012*

**Algebra 1**

xWrite the equation so that y is a function of x. -9x + 3y =18
*September 30, 2012*

**Math**

The formula s = the square root of 18d can be used to fnd the speed s of a car in miles per hour when the car needs d feet to come to a complete stop after slamming on the brakes. If it took a car 12 feet to come to a complete stop after slamming on the brakes, estimate the ...
*September 27, 2012*

**CHEM HELP ASAP!**

As a solid, Ag adopts a face-centered cubic unit cell. How many unit cells are present per cubic centimeter of Ag?
*September 27, 2012*

**5th grade math**

The moon is about 240.000 miles from Earth. What is this distance written as a whole number multiplied by the power of ten?
*September 13, 2012*

**5th grade math**

What missing number makes the number sentence, 28.02=20+8=?, true?
*September 11, 2012*

**language**

Circle the simple subject and underline the simple predicate. The smell of cooking is delicious to the hungry campers.
*September 11, 2012*

**CHEM HELP ASAP!!**

Two 20.0-g ice cubes at –10.0 °C are placed into 275 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts. heat capacity h2o (S)=37.7 j/mol*k heat capacity h2o (l...
*September 11, 2012*

**CHEM HELP ASAP!**

Calculate the heat energy released when 29.7 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point. Constants for mercury at 1 atm: Heat capacity of Hg (l) 28.0 J/Mol*K, Melting pt 234.32 k, and enthalpy of fusion 2.29 kg/mol
*September 11, 2012*

**DrBobb222!! Help!!**

Please look at my Chemistry problems again, I reposted them with the constants and such. I am still confused!
*September 11, 2012*

**Chemistry**

DrBob222, HELP! Calculate the heat energy released when 29.7 g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point. Constants for mercury at 1 atm: Heat capacity of Hg (l) 28.0 J/Mol*K, Melting pt 234.32 k, and enthalpy of fusion 2.29 kg/mol
*September 11, 2012*

**Chemistry**

DrBob222,HELP! Two 20.0-g ice cubes at –10.0 °C are placed into 275 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts. heat capacity h2o (S)=37.7 j/mol*k heat ...
*September 11, 2012*

**Chemistry**

Two - 20.0 g ice cubes @ -20 degrees C are placedinto275 g of water @ 25 degrees C. Assuming no energy is transfered to or from the surroundings caculate the final temperature of the water after the ice melts.
*September 10, 2012*

**Chemistry**

Calculate the heat energy release when 29.7 g of liquid mercury @ 25.00 degrees C is converted to solid merury at its melting point.
*September 10, 2012*

**Math**

Find the unknown digit to make the sentence true 2.48>2.4__ 1>2.463 5.723<5.72__ <5.725 7.64<7.___ 5<7.68
*September 10, 2012*

**chemistry**

What volume of 2.50 x 10-4 M CV+ solution should be diluted to 10.0 mL to prepare a 7.50 x 10-5 M CV+ solution
*September 3, 2012*

**Science**

a .5kg ball is dropped from a 30m high building is on the ground for 2ms then bounces up 20m. What avg force was exerted on the ball?
*August 23, 2012*

**Physics**

A .5kg ball is dropped from a 30m high building is on the ground for 2ms then bounces up 20m. What avg force was exerted on the ball?
*August 23, 2012*

**7th grade pre algerbra**

18 necklaces
*August 8, 2012*

**MAth!**

In the list of five measurements shown below, one is blurred. Supply a fifth value that would make the median 8. 8 5 10 3 #
*July 28, 2012*

**Math-one more**

The average length of time, per week, that students at a certain university spend on homework is normally distributed with a mean of 24.3 hours and a standard deviation of 1.4 hours. Jane tells her parents she spends more time studying than 75% of the students on campus. How ...
*July 28, 2012*

**Math**

In the list of five measurements shown below, one is blurred. What must this value be, if the mean of the five measurements is 7? 8 5 10 3 #
*July 28, 2012*

**English help**

1c 2? 3b 4c 5c 6d 21a 22c 23d 24b 25c
*July 25, 2012*

**English help**

Question 1 Marks: 1 Davey has decided to research the history of fire engines in America. To get started he's written a list of research questions. Which of the following questions is the best research question for him to ask? a. Who holds the patent for the fire engine? b...
*July 25, 2012*

**English help**

1 Which of the following is NOT part of the process of synthesizing? a. finding main ideas b. finding supporting details c. determining a purpose d. comparing and contrasting ideas is it c?
*July 25, 2012*

**English help**

11a 12c 13b 14a c d e 15a c g 16b c d 17d 18c 19e 20c 21d 22a 23b 24a 25b
*July 25, 2012*

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