Popular questions and responses by Adam
  1. chemistry

    What is the molarity of a saline solution that contains 0.900 g NaCl (58.44 g/mol) dissolved in 100.0 ml of a solution?

    asked on June 24, 2012
  2. math

    Al is twice as old as Bill, who is twice as old as Carl. In 10 years, Al will be twice as old as Carl. How old is Al now? A. 40 B. 20 C. 10 D. 5

    asked on August 15, 2014
  3. Trigonometry

    Verify whether this is an identity: ((sec^2(x))(sec^2(x)+1))/sin^2(x) + csc^4(x) - tan^2(x)*cos^2(x) = (sec^4(x))/sin^2(x) + sec^2(x)*csc^4(x) - sin^2(x)

    asked on August 5, 2020
  4. math

    By your cell phone contract, you pay a monthly fee plus some money for each minute you use the phone during the month. In one month, you spent 200 minutes on the phone, and paid $22.45. In another month, you spent 350 minutes on the phone, and paid $29.65.

    asked on September 30, 2016
  5. Physics (As Level) 12 Grade

    2) An aircraft lands on a runway at a speed of 40 meters per second (ms^-1) and brakes to a halt in a distance of 860m. Calculate a) The Braking time. B) The deceleration of the aircraft.

    asked on January 30, 2013
  6. math

    If a bicycle wheel has traveled f/π feet after n complete revolutions, what is the length in feet of the diameter of the bicycle wheel? A. f/nπ^2 B. π^2/fn C. nf/π^2 D. nf/π^2 E. f/n

    asked on August 15, 2014
  7. Algebra

    Solve. (7+u)(3u-1)=0 (If there is more than one solution, separate them with commas.)

    asked on February 1, 2011
  8. math

    china population is 1.33 billion and continues to grow at the same rate,how many years until the population reaches 1.5 billion people?

    asked on May 18, 2017
  9. CALC

    Use Newton's method to approximate a root of the equation x3+x+3=0 as follows. Let x1=–1 be the initial approximation. The second approximation x2 is _____? and the third approximation x3 is _____?

    asked on May 29, 2010
  10. power dissipation

    What is the power dissipated by resistor R1 of the following circuit: two batteries in series (with values V1 = 20 volts and V2 = 20 volts) connected across three resistors in series with values R1 = 10k, R2 = 10k, and R3 = 20k im getting the answer 4 but

    asked on May 25, 2013
  11. chemistry

    In which anion do you expect a shorter O-O distance? BaO2 or KO2

    asked on October 31, 2009
  12. math

    A low land, 48m long and 31.5 m broad is raised to 6.5 dm. For this, earth is removed from a cuboidal hole, 27 m long and 18.2 m broad, dug by the side of the land. The depth of the hole will be? A man rows 12 km in 5 hrs against the stream, the speed of

    asked on November 20, 2015
  13. math

    The value of 4x^3-x/(2x+1)(6x-3) when x=9999 If 7 men working 7 hrs a day for each of 7 days produce 7 units of work, then the units of work produced by 5 men working 5 hrs a day for each of 5 days is? Pls help***

    asked on November 19, 2015
  14. English

    Which of the following is an example of a narrative poem? A. The Bridegroom by Alexander Pushkin B. The Fish by Elizabeth Bishop C. Danny Deever by Rudyard Kipling D. All of the above

    asked on July 6, 2016
  15. college physics

    A popular daredevil trick is to complete a vertical loop on a motorcycle. This trick is dangerous, however, because if the motorcycle does not travel with enough speed, the rider falls off the track before reaching the top of the loop. What is the minimum

    asked on May 14, 2010
  16. Finance

    A firm has forecasted sales of $3,000 in April, $4,500 in May and $6,500 in June. All sales are on credit. 30% is collected the month of sale and the remainder the following month. What will be the balance in accounts receivable at the beginning of July

    asked on March 21, 2011
  17. Math

    Suppose that the height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. After 11 hours of burning, a candle has a height of 18.6 centimeters. After 27 hours of burning, its height is 12.2 centimeters.

    asked on February 5, 2011
  18. Chemistry terms

    Match the terms with the correct definitions. 1. ligand 2. coordination compound 3. Lewis base 4. complex ion 5. bidentate ligand 6. octahedral complex a) a ligand that can form two bonds (donate two electron pairs) to a metal ion. b) a neutral compound

    asked on April 17, 2008
  19. Math

    A bowl has red,green and blue marbles.There are 95 red marbles.the nuber of blue marbles is 5 timesthe number of green mables altogether red and green marbles are 189 less then blue marbles .how may marbles are there in total

    asked on May 6, 2016
  20. Math (PLEASE HELP!)

    1. The UV index on a sunny day can be modelled by the function y= -0.15(x-13)^2+7.6 , where x represents the time of day on a 24-h clock and f(x) represents the UV index. At what time(s) was the UV index 7? 2. Determine if each system has one, two, or no

    asked on June 18, 2015
  21. ALGEBRA-Help please

    Mrs. Scott decided that she would spend no more than $120 to buy a jacket and a skirt.f the price of the jacket was $20 more than 3 times the price of the skirt, find the highest possible price of the skirt. How to set up this

    asked on October 27, 2011
  22. Chemistry

    Could someone help me with these problems; A)If 5.97mL of a solution of NaCl contains 2.54g of sodium ion, what is the molarity of the sodium chloride solution? -I know M=#moles solute/L but when I do this I get 7.28*10^-3 which is wrong, the answer should

    asked on January 28, 2011
  23. Chemistry please help

    Elemental mercury was first discovered when a mercury oxide was decomposed with heat, forming mercury metal and oxygen gas. When a 0.204-g sample of the mercury oxide is heated, 0.189 g of mercury metal remains. a)what is mole ratio of mercury to oxygen in

    asked on February 15, 2012
  24. math

    A vendor bought 10 dozen eggs at the rate of Rs 22 per dozen. Six of the eggs were rotten. He sold the remaining eggs at the rate of Rs 2.50 per egg. Find his profit or loss. Ans-65 profit Pls help me

    asked on November 19, 2015
  25. electronics

    At the critical frequency, the output of a filter is down from its maximum by

    asked on May 29, 2013
  26. physics

    How far would you have to drill into the Earth, to reach a point where your weight is reduced by 8.0 ? Approximate the Earth as a uniform sphere.

    asked on April 15, 2010
  27. Language Arts

    wet with dew straggly branches slapped and scratched at my legs and hid uneven ground so that several times tumbling and sliding downward which type of conflict best characterizes the event in the passage? a character vs self b character vs nature c

    asked on May 10, 2016
  28. Physics

    A barbell is mounted on a nearly frictionless axle through its center. The low-mass rod has a length d = 0.27 m, and each ball has a mass m = 0.2 kg. At this instant, there are two forces of equal magnitude F applied to the system as shown in the figure,

    asked on November 27, 2010
  29. Math

    What is the value of the digit 8 in the number of 56,782,010,00

    asked on May 20, 2019
  30. Chemistry

    If 5.026g chromium is combined with 3.04L of chlorine gas at 0.955atm and 220C, what mass of chromium (III) chloride is produced?

    asked on November 29, 2015
  31. Chemistry

    a) A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg? b) For potassium metal, the work function W (the minimum energy needed to eject an electron from the metal surface) is 3.68 ×

    asked on October 5, 2014
  32. Physics

    The two strands of the helix-shaped DNA molecule are held together by electrostatic forces as shown in the Figure 16-44 in the textbook. Assume that the net average charge (due to electron sharing) indicated on H and N atoms is 0.2e and on the indicated C

    asked on February 4, 2013
  33. Physics

    A proton is at the origin and an electron is at the point x = 0.37 nm, y = 0.39 nm Find the electric force on the proton? I don't even know where to start. Can someone help me?

    asked on August 13, 2009
  34. Calculus

    An object's velocity after t seconds is v(t)= 38-2t feet per second. a. How many seconds does it take for the object to come to a stop (velocity = 0)? b. How far does the car travel during that time? c. How many seconds does it take the car to travel half

    asked on April 29, 2016
  35. math

    A sum is invested at compound interest payable annually. The interest in two successive years was Rs 900 and Rs 981. Find the sum. If the sum of all internal angles and sum of all external angles of a regular polygon are equal, then the number of sides of

    asked on November 20, 2015
  36. circuits

    If a series RLC circuit has R = 25 ohm, XL = 50 ohms, and XC = 30 ohms, what will be the total impedance?

    asked on May 30, 2013
  37. CHM

    Some of the cyclohexane solvent vaporized during the temperature versus time measurement. Will this loss of cyclohexane result in its freezing point being recorded as too high, too low or unaffected? Explain. Please someone explain this to me I don't

    asked on October 10, 2012
  38. Chemistry

    An aqueous KNO3 solution is made using 72.5 grams of KNO3 diluted to a total solution volume of 2.00 liters. If the molarity of the solution is .359 M and the molality of the solution is .354, what is the mass percent of the solution?

    asked on February 19, 2012
  39. calc 1

    Evaluate the indefinite integral. e^(8x)sin(e^(8x))

    asked on December 9, 2011
  40. Algebra 2

    Suppose you did a survey of male shoes size and the mean of that survey was size 10 with a standard deviation of 1.5. What is the z-score of a size of 7.5?

    asked on June 7, 2011
  41. Chemistry

    Please help with this question: B) Combustion analysis of a 22.0-mg sample of the painkiller morphine produced 13.2 mg of water. What is the % by mass of hydrogen in morphine?

    asked on January 28, 2011

    Page # D-74 How Would You Describe a Dead Skunk? A skunked skunk. no What kind of answers do you have for the ones you have correct? exstankt extinct

    asked on December 17, 2006

    page # D-76 What Relation Is a Doorstep to a Doormat? Both are stepped on. no You didn't put any parameters on this and I think its a great answer. How bout the relation being a stepson (steps on) I got astearther.... No wait it's A Step Farther eh....??

    asked on December 17, 2006
  44. physics

    A wooden box, with a mass of 22 kg, is pulled at a constant speed with a rope that makes an angle of 25° with the wooden floor. What is the tension in the rope?

    asked on December 6, 2016
  45. Chemistry

    what volume of oxygen at 423.0K and a pressure of 127.4kPa will be produced by the decomposition of 129.7g barium peroxide to form barium oxide and oxygen gas? Thank you

    asked on November 27, 2015
  46. English

    Rewrite the sentences using nouns to replace the phrases in italics. Example: She writes books for a living. She is a writer. 1. Emma loves being a mother. .................................... 2. Having friends is the most important thing for Pepe.

    asked on November 27, 2013
  47. Math

    Question 2 For the function f(x) = 3x2-2x-7, find f(2). Answer f(2) = 13 f(2) = 25 f(2) = 1 f(2) = 1/2 3 points Question 3 One day you work 3 hours and your boss gives you $22. Another day after working 4 hours your boss gives you $33. Yesterday after

    asked on May 18, 2012
  48. ELA- foreshadowing

    what lines are foreshadowing I fear, too early: for my mind misgives Some consequence yet hanging in the stars Shall bitterly begin his fearful date With this night's revels and expire the term Of a despised life closed in my breast By some vile forfeit of

    asked on December 15, 2011
  49. Physics

    A crate has a mass 24 kg. What applied force is required to produce an acceleration of 3m/s^2 if the frictional force is 90 N.

    asked on October 23, 2010
  50. college physics

    A board of mass m and length L is leaning against a wall. The wall is frictionless, and the coefficient of static friction between the board and the floor is µ. Find an expression for the minimum angle β at which the board can be leaned without slipping.

    asked on May 14, 2010
  51. Physics

    The center of a 1.10km diameter spherical pocket of oil is 1.10km beneath the Earth's surface. Estimate by what percentage directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is . Express

    asked on April 5, 2010
  52. Math

    1. The random variables X and Y are distributed according to the joint PDF fX,Y(x,y) = {ax2,0,if 1≤x≤2 and 0≤y≤x,otherwise. Find the constant a. 2. Determine the marginal PDF fY(y) . (Your answer can be either numerical or an algebraic function of

    asked on July 3, 2019
  53. Physics

    a force of 2N Stretches an elastic rubber by 0.2M Find the elastic constant

    asked on May 20, 2019
  54. Math

    What is greater 3/5 or 3/4

    asked on October 1, 2018

    find the concentrations of H+, HCO3-, CO3 2- in a 0.025M in H2CO3 solutions

    asked on February 22, 2016
  56. Chemistry

    A Sample of propane, C3H8, occupies 5.00L at 270C and 309torr. The volume of the canister is changed to 1.85L while the pressure remains constant. What is the Temperature, in K and 0C, of the gas after the change? What would be the setup for this problem?

    asked on November 26, 2015
  57. Math

    Evan type 72 pages of notes one day. He typed one half of the pages in the morning and one third of the pages in the afternoon. He type the rest of the pages in the evening. How many pages of notes that he typed in the morning and afternoon

    asked on November 19, 2015
  58. gov

    How many votes does each state have in the Electoral College? is equal to number of members the state has in congress Just checking if this is correct.

    asked on October 12, 2015
  59. chemistry

    The amount of organic carbon in a sample can be obtained by IR analysis of the carbon dioxide (CO2) released following complete combustion of the sample in oxygen. A reference sample of an organic compound is usually used to calibrate the instrument

    asked on May 8, 2015
  60. data

    Given the following business scenario, create a Crow’s Foot ERD using a specialization hierarchy if appropriate. Tiny Hospital keeps information on patients and hospital rooms. The system assigns each patient a patient ID number. In addition, the

    asked on May 8, 2015
  61. English 12

    Which theme from Macbeth do these lines support? "This supernatural soliciting Cannot be ill, cannot be good. If ill, Why hath it given me earnest of success, Commencing in a truth?" A) Those without convictions are easily manipulated. B) Darkness is

    asked on September 13, 2014
  62. Chemistry

    For the following reaction, identify the substance oxidized, reduced and the oxidizing and reducing agents. 2SO2 + O2 ----> 2SO3

    asked on October 30, 2013
  63. chemistry question

    What mass of propane (C3H8) is needed to produce 346 g carbon dioxide in the following reaction? C3H8(g) + 5O2(g) -> 3CO2(g) + 4H2O(g) A. 346 g C3H8 B. 115 g C3H8 C. 5075 g C3H8 D. 1.86 g C3H8

    asked on August 15, 2013
  64. physics

    Discuss the relationship between motion and force including the following terms: velocity, acceleration, equilibrium, contact force, and field force.

    asked on May 9, 2013
  65. math

    A solar home contains 3.50 multiplied by 105 kg of concrete (specific heat = 1.00 kJ/kg·K). How much heat is given off by the concrete when it cools from 29 to 20°C?

    asked on November 13, 2012
  66. phsycs

    A person shouts in a canyon. 3 s later they hear the echo. How far away is the canyon wall from which the sound wave was reflected? how do i do this problem?

    asked on July 19, 2012
  67. Ohm's LAW ELECTricity shop

    what is the resistance if a circuit with 120v and 5A its 24 how do i make a diagram of a circuit based on the info above

    asked on November 8, 2011
  68. Math

    A box of cereal cost $3.59 for 30 oz. Find the unit rate.

    asked on November 3, 2011
  69. Chemistry

    The decomposition of HI(g) is represented by the equation: 2HI(g) H2(g) + I2(g) Kc= 64 at 25°C. If the equilibrium concentrations of H2 and I2 at 400°C are found to be [H2] = 5.4x10-4 M and [I2] = 8.8x10-3 M, what is the equilibrium concentration of HI?

    asked on October 18, 2010
  70. Organic chem

    Classify each as a lewis acid or lewis base... A)H20 B)O2- C)Cu2+ D)SO3 E)AlCl3 Lewis acids are electron pair acceptors. Lewis bases are electron pair donors. Look at H2O, for example. .. H:O: .. H This molecule has no "holes" to accept an electron. Would

    asked on October 15, 2010
  71. CHEM

    How are the forward and reverse rate constants for a one-step reaction related to the equilibrium constant for the reaction? A)Kc = kf x kr B) Kc = kf - kr C) Kc = kf + kr D) Kc = kf/kr

    asked on May 29, 2010
  72. Biology 205

    Can someone please help me? In 1861, Louis Pasteur observed that when yeasts grow in a sugar and protein medium, completely free of air, they ferment vigorously; and for every gram of yeast that forms, 60 to 80 grams of sugar disappeared. If the experiment

    asked on May 12, 2010
  73. physics

    Two pith balls below each have a mass of 5.0 g and equal charge. One pith ball is suspended by an insulating thread. The other is brought to x = 4.0 cm from the suspended ball. The suspended ball is now hanging with the thread forming an angle of 30.0°

    asked on February 8, 2010
  74. art`1234567890-=1234567890-

    im doing my GCSE art exam and have picked the question viewpoints E.g. cubism. so i need some secondary and primary sourses but don't know what do do. what do you suggest?? thanks

    asked on January 19, 2010
  75. GCSE P.E. 534785623789651982

    How did performances at the Sydney Paralympics help in the promotion of disability sport? thanks

    asked on September 28, 2009
  76. GCSE P.E. 2357238572309

    basic rules of curling??

    asked on September 28, 2009
  77. GCSE P.E. 534785623789651982

    How did performances at the Sydney Paralympics help in the promotion of disability sport? thanks

    asked on September 28, 2009
  78. chemistry7656847547659756946534

    what causes the different physical properties between HCl and NaCl

    asked on September 28, 2009
  79. Science -Electricity

    A complete circuit requires an _____ ____ for electricity to flow from the ______to the _______ in the circuit and ______to the battery. I'm trying to fill in the blanks. I think the first two are electric current think the second two are positive and

    asked on May 14, 2009
  80. Chem

    COMPOUND 1 CH2 = CH-CH-OH with CH3 under the second CH Plus CH3-CH-CH2-C (double bond O off C and -OH off C) also a CH3 under CH i) complete the equation for this reaction ii) Indentify any new functional groups in the organic product(s)name them iii)State

    asked on March 12, 2007
  81. Chemistry

    Methanol, CH3OH, is produced on an industrial scale from carbon monoxide and hydrogen. At the temperatures used, gaseous methanol is formed according to the following thermochemical equation: CO(g)+ 2H2(g) CH3OH(g) £H = -90Kj 1. State Le Chateliers

    asked on March 2, 2007
  82. math

    why did the indian wear feathers in his hair. ..brain teaser help How is this related to "math"? I think that it is partially a symbol of status. However, since this is not my area of expertise, I searched Google under the key words "Indian feathers" to

    asked on November 30, 2006
  83. liver!

    After a meal, blood entering the liver has higher levels of what substance than the blood leaving the liver? A.

    asked on August 4, 2006
  84. bio

    4. During the process of photosynthesis, light energy is used directly in the A. formation of ATP B. reduction of NADP C. excitation of chlorophyll electrons D. splitting of carbon dioxide molecules I think it is a or d but i am unsure... It is a or d.

    asked on June 29, 2006
  85. unsaturated!

    Alkenes and alkynes are unsaturated. This means??? um.. I honesly don't know what this means! Since this is not my area of expertise, I searched Google under "unsaturated alkenes to get this source:

    asked on June 22, 2006
  86. Maths

    When I take 4 times a certain number from 50 the remainder is 6. What is the number?

    asked on February 23, 2020
  87. Chemistry

    Calculate the number of moles of mgcl2 is produced by reacting 168g ofmgco3 with excess hcl(mg=2,c=12,o=16,cl=35.5)

    asked on November 23, 2019
  88. world history

    can someone please check my answers 1.) the purpose of american and european imperialism in the pacific was mainly to gain for manufactured products b.coaling stations and navel bases c.sources of raw materials d.places for surplus population i

    asked on October 29, 2019
  89. Physics

    Runner 1 is standing still on a straight running track. Runner 2 passes him, running with a constant speed of 1.5 m/s. Just as runner 2 passes, runner 1 accelerates with a constant acceleration of 0.73 m/s^2. How far down the track does runner 1 catch up

    asked on September 8, 2019
  90. math

    A stick of length 1 is broken into two pieces of length Y and 1−Y respectively, where Y is uniformly distributed on [0,1] . Let R be the ratio of the length of the shorter to the length of the longer piece. Find the PDF fR(r) of R . Hint:. What is the

    asked on August 4, 2019
  91. math

    Alice has two coins. The probability of Heads for the first coin is 1/4, and the probability of Heads for the second is 3/4. Other than this difference, the coins are indistinguishable. Alice chooses one of the coins at random and sends it to Bob. The

    asked on July 15, 2019
  92. math

    Alice has two coins. The probability of Heads for the first coin is 1/4, and the probability of Heads for the second is 3/4. Other than this difference, the coins are indistinguishable. Alice chooses one of the coins at random and sends it to Bob. The

    asked on July 14, 2019
  93. math

    A defective coin minting machine produces coins whose probability of Heads is a random variable Q with PDF fQ(q)={5*q^4 if q∈[0,1] A coin produced by this machine is tossed repeatedly, with successive tosses assumed to be independent. Let A be the event

    asked on July 13, 2019
  94. Math

    Suppose you buy a home and finance $255,000 at $2,293.17 per month for 30 years. What is the amount of interest paid? (Round your answer to the nearest cent.)

    asked on April 6, 2018
  95. Physics0

    A) What area of a black body kept at 300°C radiates 100W? B) If a 25m2 roof has a U-value of 0.4Wm^-2 °C^-1, how much heat, expressed in MJ, would escape through it over a day if the temperature inside the building was maintained at 7°C above the

    asked on August 16, 2017
  96. Physics0

    how to estimate the root mean square speed of hydrogen molecules in the earth's atmosphere in km h^-1? thanks for your help, I'm actually teaching myself physics and that why sometimes I get stuck even with simple questions

    asked on August 16, 2017
  97. Physics0

    The currently accepted maximum depth limit for safe scuba diving while breathing air is 50 metres. What is the absolute partial pressure of oxygen at this depth? my solution was as the following, please correct me if I'm wrong: P=F/A Thus the pressure

    asked on August 14, 2017
  98. physics

    A wheel has an initial speed of 100 radians/s. It is then slowed down with a magnitude of the constant angular acceleration of 6.0s^-2. To make it come to rest, how many revolutions does it need to make?

    asked on July 10, 2017
  99. physics

    A plane is in a steep downward plunge. To not crash, Captain Q pulls as much as he can. When the plane is at the lowest point of the plane's path the plane is in a circular arc of radius 450m. Captain Q experiences an acceleration of 5.0g ( so her weight

    asked on July 10, 2017
  100. physics

    Two Small sphere are given positive electrical change. When they are 40cm apart the repulsion force between them has magnitude 0.25N what the charge on each sphere if two changes are equal

    asked on March 19, 2017


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