# Questions Asked onJanuary 24, 2013

1. ## math

how do owners of large estates spend their time.

2. ## Chemistry

2. Suppose that the amount of algae in a pond doubles every 4 hours. If the pond initially contains 90 pounds of algae, how much algae will be in the pond after 12 hours? A.)720 pounds B.)360 pounds C.)1,440 pounds D.)114 pounds I think the answer is D.

3. ## algabre

the speed of the current in a river is 6 mph a ferry operator who works that part of the river is looking to buy a new boat for his business everyday his route takes him 22.5 miles against the current and back to his deck and he needs this trip in a total

4. ## Physics

Identical point charges of +2.1 ìC are fixed to diagonally opposite corners of a square. A third charge is then fixed at the center of the square, such that it causes the potentials at the empty corners to change signs without changing magnitudes. Find

5. ## Physics

How much work is needed to stop a 20g bullet moving with a speed of 150ms-1

6. ## Math

Adam drew two same size rectangles and divided them into the same number of eqal parts. He shaded 1/3 of one rectangle and 1/4 of the other rectangle. What is the least number of parts into which both rectangles could be divided?

7. ## Chemistry

What mass of AlCl3 can be formed from 5.000 mol NiCl2 and 2.000 mol Al? Al(s) + NiCl2(aq) → AlCl3(aq) + Ni(s) I balanced it to 2Al + 2NiCl2 -> 2AlCl3 + 3Ni I'm not sure how to go about this. I converted the moles into grams, but I feel like the balanced

8. ## Chemistry

The neutralization of H3PO4 with KOH is exothermic. H3PO4(aq) + 3KOH(aq) -> 3H2O(l) +K3PO4(aq) +173.2KJ 70.0 mL of 0.207 M H3PO4 is mixed with 70.0 mL of 0.620 M KOH initially at 21.87 °C. Predict the final temperature of the solution if its density is

9. ## Math

Find the volume V of the solid obtained by rotating the region bounded by the given curves about the specified line. y = 8 sin x, y = 8 cos x, 0 ≤ x ≤ π/4; about y = −1

10. ## Physics

Identical point charges of +2.1 ìC are fixed to diagonally opposite corners of a square. A third charge is then fixed at the center of the square, such that it causes the potentials at the empty corners to change signs without changing magnitudes. Find

11. ## Differential Equations

The velocity v of a freefalling skydiver is well modeled by the differential equation m*dv/dt=mg-kv^2 where m is the mass of the skydiver, g is the gravitational constant, and k is the drag coefficient determined by the position of the driver during the

12. ## physics

A spring with an unstrained length of 0.074 m and a spring constant of 2.4 N/m hangs vertically downward from the ceiling. A uniform electric field directed vertically upward fills the region containing the spring. A sphere with a mass of 5.1 X 10^3 kg

13. ## science (physics)

What is the mass in kg of a 3920 N piano?

14. ## physics

A stationary billiard ball, mass 0.17 kg, is struck by an identical ball moving at 4.8 m/s. After the collision, the second ball moves off at 60° to the left of its original direction. The stationary ball moves off at 30° to the right of the moving

15. ## math

how do owners of large estates spend their time

16. ## pre-algebra

You split $1500 between two savings accounts. Account A pays annual 5% interest and Account B pays 4% annual interest. After one year,you have earned a total of$69.50 in interest. How much money did you invest in each account?

17. ## Chemistry

Solid sodium reacts violently with water, producing heat, hydrogen gas, and sodium hydroxide. How many molecules of hydrogen gas are formed when 48.7 g of sodium are added to water?

18. ## math

what is the purpose of using fraction strips and a 1 strip

35. ## chem(isotopic abundance)

The average atomic mass of iridium is 192.22u, if iridium-191 has an atomic mass of 190.961u and an isotopic abundance of 37.3% and iridium-193 is the only other natural occuring isotope, what is the atomic mass of iridium-193? I tried but I don't think I

asked by Deepa( Exam prep question)
36. ## floral design

One of your friends who works at a local public TV station knows that you wish to break into event-floral designing. She attended a party last week for which you had created an amazing set piece that surrounded a small dance floor. Impressed with your

37. ## Physics

When the pendulum bob reaches the mean position, the net force acting on it is zero. Why then does it swing past the mean position? I have no idea.. i know that it has momentum ..but...

38. ## Chemistry

For melting point determination, what is the optimum rate of heating near the melting point? What are the problems, if the rate of heating is too slow or fast?

39. ## algebra

A sheet of cardboard with an area of 10 square feet is made into a closed rectangular box. The four sides of the box have the same area and two ends have the same area. The area of each of the four equal sides is twice the area of each end. What is the

40. ## Physics

Four resistors each of resistance 4 Ù are connected to form a square loop. What is the equivalent resistance between two points on its diagonal AC or BD? A-------------D | | B-------------C That's what it looks like on my homework. Thank you in advance

41. ## math

A farmer needs to fence a rectangular piece of land.She wants the length of the field to be 55 feet longer than the width. If she has 1310 feet of fencing material, what should be the length and the width of the field?

42. ## World history; Check:P

5.What does Hebrew law required of believers? The Hebrews were to "worship God and live justly with one another", God required you "to do justice, to love kindness, and walk humbly with God". And worship only one God, which was him.

43. ## math

Seigi and Gavin both worked hard over the summer. Together, they earned a total of $425. Gavin earned$25 more than Seigi. Hoe much did each of them earn??

44. ## algebra

siplify and state any restrictions on the variables. x-2/x+3 plus 10x/x^2-9 Hope someone can explain this to me.

45. ## English-Grammar

Decide if the underlined pronoun (I put what was underlined in parentheses) in the sentences below is being used as a subject, a predicate nominative, or an appositive. (He) and Bev are using the new computer. subject (my answer)predicate nominative

46. ## physics

A block with mass = 5.0 rests on a frictionless table and is attached by a horizontal spring ( = 130N ) to a wall. A second block, of mass = 1.35 , rests on top of the block . The coefficient of static friction between the two blocks is 0.40. What is the

47. ## Physics

A pendulum clock is accurate on earth, where the period of its pendulum is 1.00 s. (a) Find its period on the moon, where gravitational acceleration is 1.6 m/s2. (b) During a 2 h interval, what would be the elapsed time shown on the clock? CAN YOU PLEASE

48. ## Physics

Which of the following equations describes the condition for observing the fourth bright fringe in Young's double-slit interference pattern? Assume n = 0 for the central bright fringe. Which of the following equations describe the condition for observing

49. ## physics Electricity

Two tiny conducting spheres are identical and carry charges of -20.0 μC and +50.0 μC. They are separated by a distance of 2.50 cm. (a) What is the magnitude of the force that each sphere experiences, and is the force attractive or repulsive? (b) The

71. ## physics

A block with mass = 5.0 rests on a frictionless table and is attached by a horizontal spring ( = 130 ) to a wall. A second block, of mass = 1.35 , rests on top of . The coefficient of static friction between the two blocks is 0.40. What is the maximum

72. ## English

Read the clauses. Then write main or subordinate for each clause. if the clause is a subordinate clause add a main clause to make it a complex sentence Before I go to school Subordinate Before I go to school I take a shower We heard a concert at Town Lake

73. ## chem hwk

a simple hwk question.. i don't understand what i need to do.. 1-butanol (shown below) burns in the presence of oxygen to give off carbon dioxide and water by the following reaction: C4H9OH + 6 O2 ==> 4 CO2 + 5 H2O If 40.88 mL of 1-butanol burns

74. ## Physics

Find g at a point on earth where T = 2.249 s for a simple pendulum of length 1.250 m, undergoing small-amplitude oscillations. (Enter your answer to four significant figures.) CAN YOU PLEASE PROVIDE AN ANSWER WITH WORK . THANK YOU VERY MUCH!!!!!

75. ## Physics

If sound is increased in intensity by a factor of 100,000, what is the change in decibels? I thought 50? other options are 5, 500, and 100,000. Please explain because I'm confused on how this works.

76. ## English

Read the sentences combine them by changing one sentence into a phrase 1.Alexis helps people understand the exhibits. Alexis is a guide at the museum. Alexis, a guide at the museum,helps people understand the exhibits. 2.Settlers built new towns in Texas.

77. ## Enlish

I'm supposed to be writing an essay and these are the instructions: This semester you read several memoirs, including pieces by Ernesto Galarza and Russell Baker. Return to “Barrio Boy” and “No Gumption” now. How are these two memoirs similar? How

78. ## Math

The first ferris wheel was built in1893 in Chicago. It's diameter was 250 feet.how many feet did the ferris wheel rotate with each complete turn?

79. ## Physics 1

A ball starts from rest and rolls down a hill with uniform acceleration, traveling 150 m during the second 5.0 s of its motion. How far did it roll during the first 5.0 s of motion?

80. ## Calculus 1

(a) What is the continuous percent growth rate for P=130e^0.07t , with time, t , in years? (b) Write this function in the form P=P0a^t. What is the annual percent growth rate? Round your answer to two decimal places. I tried it but now I'm just more

81. ## math

The ratio of mystery books to the number of science fiction books is 4:3. The number of sci-fi books to the number of biographies is 4:5. If there are 48 sci-fi books what is the total number of books

82. ## physics

A block with mass = 5.0 rests on a frictionless table and is attached by a horizontal spring ( = 130N ) to a wall. A second block, of mass = 1.35 , rests on top of the block . The coefficient of static friction between the two blocks is 0.40. What is the

83. ## physics

A bicycle traveled 150 meters west from point A to point B. Then it took the same route and came back to point A. It took a total of 2 minutes for the bicycle to return to point A. What is the average speed and average velocity of the bicycle?

84. ## phy

A piece of plastic barely floats in water. If it has a mass of 20g, what is its volume?

85. ## Physics STUCK!

A point on the A string of a guitar oscillates in approximately simple harmonic motion with a frequency of 113 Hz and an amplitude of 1.04 mm. Find the maximum speed and acceleration of this point. SOLVE FOR: vmax = amax Can you please provide me with the

86. ## World history; Check:P

How did environmental features in Anatolia help the Hittites advance technologically? The Hittites were the first to use iron for weapons, because the materials they needed were easily in the mountains of Anatolia. Iron was easy to get to for the Hittites

87. ## Physics

A spring scale being used to measure the weight of an object reads 17.1 N when it is used on earth. The spring stretches 4.40 cm under the load. The same object is weighed on the moon, where gravitational acceleration is 1/6g Find the reading of the spring

88. ## chemistry

when silver nitrate reacts with hydrochloric acid, what type of reaction takes place?

89. ## Math

A bag contains 12 slips of paper of the same size. Each slip has one number on it, 1-12. Find P(even number). Find P (a number less than 6). Find P (an odd number). Find P (a number greater than 8).

90. ## Chemistry

a 15ml sample of sulfuric acid was titrated against a solution of .0100 mol per litre of sodium hydroxide. to bring about neutralization, 25.00 ml of sodium hydroxide solution was required. calculate the concentration of the sulfuric acid

91. ## CHEM! (SCIENCE) NEED HELP

Balance the equation; ___Mg+__HCI->__MgCI2+__H2 How many moles of hydrogen gas are produced when 3.0 molesbof magnesium react?

92. ## chemistry

calculate the rate of a constant reaction at 293 kelvin when the energy of activation is 103 kilo joules per mole and the rate constant at 273 kelvin is 7.87*10 to the power -7...

93. ## Chemistry.

Caculate the wavelength of light emitted when each of the following transitions occur in the hydrogen atom. A.) n=3->n=2 B.) n=4->n=3 C.) n=2->n=1 How do you do this. Could you please just show me step by step for atleaset one. Please!

94. ## Math trigonometry

Prove sinA/1+cosA =tan1/2A

95. ## Physics

A plane is flying southwest at 155 mi/h and encounters a wind from the west at 45.0 mi/h. What is the plane's velocity in respect to the ground in standard position? I know the answer, but can't figure out how to get the answer. Any help would be

96. ## pstat.................HELP........................

Electric motors coming off two assembly lines are pooled for storage in a common stockroom, and the room contains an equal number of motors from each line. Motors are periodically sampled from that room and tested. It is known that 10% of the motors from

97. ## CHEM! (SCIENCE) NEED HELP

According to the reaction below,if 24 moles CO2 were produced,how many moles of C2H6 were reacted? 2C2H6+7O2 -> 4CO2+6H2O

98. ## Introduction to management

Young, innovative, or high-tech firms often adopt the strategy of ignoring history or attempting to do something radically new. In what ways might this strategy hinder them?

99. ## Math

After 14 boys leave the concert, the ratio of boys to girls is 3 to 10. If there are p girls at the concert, write an algebraic expression for the number of boys at the beginning of the concert in terms of p

100. ## physics

A 6.2 g piece of clay is propelled horizontally onto a block of wood with a mass of 18.4 g. The wood block is initially at rest on a 1.75 m tall post. After the collision the wood block will land 2.2 m from the base of the post. Find the initial speed of

101. ## English

Read each sentence. Write whether the sentence is declarative interrogative imperative or exclamatory 1.Use caution when you cross the street. Imperative 2.Where was Lyndon B. Johnson born? Interrogative? 3.The planet closest to the sun is Mercury.

102. ## Statistics

Which of the following statements is not true about samples that can be treated as matched pairs data? I. Data collected on these samples is analyzed by calculating the differences between paired observations and using that data in one sample tests. II.

103. ## math

angle ABC and DEF are supplementary angles. the measure of DEF is 20 degrees less than 3 times the amount of ABC. what are ABC and DEF.

104. ## financial acct

Crowns issed 40,000 shares of $5 par value common stock for$14 per share. Prepare journal entries using a chart of acct.

105. ## math

What is the value of the following future amount? a)RM800 to be received 10 years from now discounted back to present at 10%. b)RM1, 000 to be received 8 years from now discounted back to present at 3%.

106. ## Chemistry

Write the chemical equation showing dihydrogen phosphate and hydrogen phosphate conjugate acid-base relationship. Identify the acid and base. Explain how the equilibrium is shifted as buffer reacts with an acid and reacts with a base.

107. ## Chemistry

If a 100.0 gram sample of a radioactive isotope goes through three half-lives, how much of the original radioactive isotope will remain?

108. ## phy

At what temperature will the root-mean-square speed of oxygen molecules have the value of 640 m/s? 1 kilomole of oxygen has a mass of 32kg.

109. ## chem.(sci)

___NH3+___O2->N2+H2O (this is not balanced) how many moles of oxygen react with 0.23 moles of NH3? HOW many moles moles of N2 will be produced when reacted with 5 mol of O2?

110. ## History

8. What happened to Japanese Americans during World War II? A.) They were forced to leave the country. B.)They stayed in their homes. C.) They all joined the Japanese army. D.) They were sent to internment camps. I think it is C. Thank You.

111. ## physics

The temperature of the air outside on a cool morning is 11„aC.What is this temperature on the Kelvin scale?

112. ## Math

Rusty is building a doghouse for his dog, Wheezer. He is making the dimensions of the doghouse proportional to his own house, which has a length of 54 feet and a width of 36 feet. If wheezer's new home is going to have a length of 6 feet, what will be the

113. ## Chemistry

I need to solve latent heat. It gives me the number of ice cubes and the mass in grams (7550 grams). It wants to know how many calories would burn turning the ice into body temperature water (if body temp is 37 degrees celsius.) It gives Lm of H2O=1,44

114. ## Physics

A series combination of two resistors of resistance 12 Ù and 8 Ù is connected across a source of emf 24 V. What is the potential difference across 8 Ù resistors? Do you know the formula for this?

115. ## chemistry

what volume of .025 M hydrochloric acid will neutralize 150 milliliters of .0133 M sodium hydroxide?

116. ## pstat.................HELP........................

A diagnostic test for a disease is said to be 90% accurate inthat if a person has the disease, the test will detect it withprobability 0.9. Also, if a person does not have the disease, thetest will report that he or she does noot have it with

117. ## Physics

The height of a rocket is launched from a platform 12 meters above the ground is modeled by the function h(t)=-4.9t^2+25t+12 where h(t) represents the height of the rocket in meters and t represents the number of seconds after launching. How many seconds

118. ## Physics

The height of a rocket is launched from a platform 12 meters above the ground is modeled by the function h(t)=-4.9t^2+25t+12 where h(t) represents the height of the rocket in meters and t represents the number of seconds after launching. How many seconds

119. ## Chemistry

Write the chemical equation showing dihydrogen phosphate and hydrogen phosphate conjugate acid-base relationship. Identify the acid and base. Explain how the equilibrium is shifted as buffer reacts with an acid and reacts with a base.

120. ## CHEM! (SCIENCE) NEED HELP

Determine the moles of aluminum acetate,AL(C2H3O2)3,that can be made if you do this reaction with 12 moles of acetic acid (C2H3O2H) C2H3O2H+AL(OH)3->AL(C2H3O2)3+3H2O

121. ## phy

Calculate the electric power which must be supplied to the filament of of a light bulb operating at 3000K. The total surface area of the filament is 8×10−6m2 and its emissivity is 0.92.

122. ## phy

A 0.5kg piece of metal (c = 600/kgK) at 300 degree celcius is dumped into a large pool of water at 20 degrees celcius. Assuming the change in temperature of water to be negligible, calculate the overall change in entropy for the system

Brittany throws a slingshot pellet directly at a target that is far enough away to take 0.190 s to reach. How far below the target does the pellet hit? Enter m as unit. How high above the target should she aim? Enter m as unit.

124. ## math

0.3 divided by 0.06 simplify the expression 2: 4+3 time 3-5 simplify the expression 3: a jogger on a treadmill is jogging at 5 miles per hour. which of the following is the time it will take him to jog 1 mile

125. ## World history; Check:P

What methods did the Assyrians use when they attacked enemy cities? The satrapies were linked by a 2,500-kilometer highway, the most impressive stretch being the Royal Road, built by command of Darius I. Royal inspectors, the "eyes and ears of the king",

126. ## MATH -- INFINATE SOLUTIONS?? HELP!!

Can anyone help me solve this problem; 2x + 3 = 2x + 4 - 1 and explain why there are an infinite number of solutions? Thanks!!

127. ## chemistry

What is the silver ion concentration in a solution prepared by mixing 385 mL of 0.380 M silver nitrate with 467 mL of 0.409 M sodium chromate? The Ksp of silver chromate is 1.2 × 10-12 I ended up making Ag+ = 2x. = 1.3 x10^-4 Which is incorrect so I'm not

128. ## Teddy

f(x,y) = 3x + 3y Show that for any epsilon in: |2x + 3y - 5| < epsilon There is a delta value: sqrt((x - 1)^2 + (y - 1)^2) < delta Solve for delta in terms of epsilon ------ I understand that this is a proof that the limit of f(x,y) as (x,y) -> (1,1) is 5.

Solve: 3 1/2+4 5/7

130. ## ALLIED HEALTH

If you work in a hospital or doctor's office and assign numeric values to procedures and diagnoses for the purpose of reimbursement, you are a

131. ## Statistics

What is the P(H,H,T,T) on four flips of a coin?

132. ## chemistry

What mass of lead (II)chloride would precipitate if a solution containing 8,28 g of lead (II) ions(Pb2+) reacts with excess HCl?

281. ## math

is eating an apple a physical change?

282. ## math

is eating an apple a physical change?

283. ## World History

How did the struggle between rich and poor affect Athens and Spartens?

284. ## Algebra 1

A car travels on a highway at an average speed of 65 miles per hour. What was the speed in feet per second? (Remember- 1 mile=5280 feet)

285. ## Algebra 1

Solve this proportion- 4/x+3=8/10

286. ## math help

The price was reduced from four thousand, four hundred ninety six dollars to one thousand, eight hundred ninety three dollars. By how much was the price reduced?

287. ## Algebra

how can i break this down .2y+4.2=

288. ## Math

Contruct a triangle RST in a way that TR=31 mm, RS=62 mm and angle STR=60 degrees....

289. ## math help

Use digits to write eighty five hundred thousandths

290. ## math

the sum of two twin numbers is 60 what are the number

asked by Deepa( Exam prep question)
291. ## anatomy

how many extremities are in the human body?... is it only two with is our upper extremity and lower body?... help!..thanks!

292. ## algebra 1

The length of a rectangle is 5mm longer than it's width. It's perimeter is more than 30mm. Let w equal the width of the rectangle.. What could be a equation to support this??

293. ## math help!

Solve: 18x=9*10

294. ## math help!

The curtis car traveled an average of 21 miles per gallon of gas. At that rate, how far could the car travel on a full tank of 21 gallons

295. ## English

Read the sentences Add the correct end punctuation to each one Do earthquakes occur in Texas ? The sound of sirens awakened us . For English class, what book will you read ? That's a giant fire ant mound ! Please put away your books . That player just made

296. ## Calculus

1. Find the area of the region between the curves y=sin(x pi/2) and y=x. 2. Find the area of the region between the curves y=sin(x), y=sin(2x), x=0, and x=pi/2.

1. Write the verb form for: yo/hacer. 2. Write the verb form for: ellos/hacer. 3. Write the verb form for: nosotros/hacer. Thank You

298. ## math

(4x^3+5x^2-2x-1)-(3x^2+7x-4)

299. ## Math

What would be the geometric shape of a mansard roof?

300. ## Chemistry

Convert 3.3cm^3 to m^3

301. ## organic chemistry

what is this compound, it has a mf of c6h12o i. imgur. com/gCgw0Hi. png

302. ## Math

A machine does 1000 tasks in 4.3 x 10^-2 seconds. How much task will be done in 2 hours? Leave answer in scientific notation.

303. ## Math

Which of the following choices is correct? A. 0.43

304. ## English

Question: How can I rewrite this sentence to maintain the 3rd person academic tone? Is my answer correct? 1. You have probably figured out that the boy named Walter was Walter Elias Disney. My answer: One has probably figured out that the boy named Walter

305. ## construct truth table

Construct a truth table for q w/upside down v~p. Using the following below: p: this is an orange q: the monkey is tall

306. ## maths

A sum of rs76.50 was pain in 50,25 and 10 paise coins. The number of 10p coin used was four times a number of 25p coin and 10 times of 50p coins how many were there of each ?????

307. ## Bigfoot Reserch Report

Help me i am doing a resherch report on bigfoot. I need some websites that are helpful other than wikipedia.

308. ## math

a body moving with acceleration of 4 m/sec2 describes 60 m in the 8th second. Find its initial velocity

309. ## phy

A string of natural length L extends to a new length L' under tensile force F. If Hooke’S law applies, the work done in stretching the spring is ------------

310. ## NSU

Evaluate (if possible) the function at the given values of the independent variable. Simplify the results. (If an answer is undefined, enter UNDEFINED.) f(x)=sin x f(pi)= f(5pi/4) f(fpi/30

311. ## Chemistry

The antifreeze in a car is a 50% by weight solution of ethylene glycol, C2H6O2 in a water solvent. Calculate the boiling point and freezing point of this solution. (For H2O, Kb=0.52 C/m Kf= 1.86 C/m I can't even find the formula for this in my book, please

1. Write the verb form for: yo/hacer. 2. Write the verb form for: ellos/hacer. 3. Write the verb form for: nosotros/hacer. Thank You.