Most popular questions and responses by J
  1. Physics

    What is the thinnest film of a coating with n=1.42 on glass n=1.52 for which destructive interference of the red component (650 nm) of an incident white light beam in air can take place by reflection? I am confused on the n's and I have no idea what

    asked on April 21, 2008
  2. Us government

    19. How is Snyder v Phelps an example of competing rights? Be specific in your answer. The court case of Snyder v phelps is an example of competing rights because the rights of privacy and speech are making distress and this came into conflict with the

    asked on November 18, 2017
  3. math-precalculus

    A Ferris wheel is 50 meters in diameter and boarded from a platform that is 1 meters above the ground. The six o'clock position on the Ferris wheel is level with the loading platform. The wheel completes 1 full revolution in 6 minutes. How many minutes of

    asked on April 30, 2017
  4. Algebra

    For questions 1-5 solve the equation. 1.-2v-7=23 (A)15 (B)8 ★ (C)-8 (D)-15 2. X/3-10=-12 (A)-6 (B)-66 (C)6 (D)66★ 3. d/3+10=7 (A)51 (B)20 ★ (C)0 (D)-9 4. 2(2-2x)=-3x (A)-4 (B)4 ★ (C)6 (D)0 5. 2.9n+1.7=3.5+2.3n (A)3 (B)-3 (C).3 (D)1 For questions

    asked on December 2, 2016
  5. Chemistry

    A coffee cup calorimeter contains 25.0 grams water at 23.8 C A 5.00g sample of an unknown metal at an initial temperature of 78.3 C was dropped into the calorimeter. The final temperature of mixture was 46.3 C. Calculate the specific heat of the metal. The

    asked on March 19, 2013
  6. Physics

    Medical x rays are taken with electromagnetic waves having a wavelength around .1 nm. What are the frequency, period, and wave number of such waves? ok I got the frequency as 3 * 10^18 Hz and the wave number as 6.3 *10^10 rad/m but I can't seem to remember

    asked on March 31, 2008
  7. Math page 167 algebra did you hear about...

    Hi I need help with this one problem. It's on page 167 algebra with pizzazz. It has to use the addition method. 3x-5y=7 5x-2y=-1

    asked on February 5, 2013
  8. chemistry

    Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide. What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750. mL of water?

    asked on October 4, 2010
  9. math

    a cube with 2 in sides is placed on a cube with 3 in sides. then a cube with 1 in sides is placed on the 2 in cube. what is the surface area of the three cube tower?

    asked on March 21, 2013
  10. Math

    A 6 inch personal pizza has 630 calories, with 240 of those from fat. A 16 inch pizza is cut into 8 slices. Estimate the number of calories in one slice of a 16 inch pizza.

    asked on February 10, 2017
  11. Wold History

    Which of the following most directly resulted from the Neolithic Revolution? •Populations increased. •Complex cultures blended. •Religion became less important. 2. Which of the following best describes the emergence of social classes in early

    asked on September 13, 2016
  12. Physics

    A closely wound rectangular coil of 80 turns has dimensions of 25 cm by 40 cm. The plane of the coil is rotated from a position where it makes an angle of 37 degrees with a magnetic field of 1.10 T to a position perpendicular to the field. The rotation

    asked on March 3, 2008
  13. chemistry

    50cm3 of hydrogen is collected over water at 17 degree celsius and 750 mm Hg pressure.Calculate the volume of dry gas at S.T.P.The water vapour pressure at 17 degree celsius is 14 mm Hg?

    asked on May 28, 2015
  14. Physics

    The crystalline lens of the human eye is a double convex lens made of material haveing an index of refraction of 1.44. Its focal length in air is about 8 mm which also varies. We shall assume that the radii of curvature of its two surfaces have the same

    asked on April 7, 2008
  15. Language Arts

    The man quickly but carefully opened the oyster’s hard shell. A. quickly B. but C. carefully D. opened I think the answer is B but i am not sure. Can you check this and explain what a conjunction exactly is. Thanks!

    asked on April 18, 2016
  16. Math

    You need to buy some chicken for dinner tonight. You found an ad showing that the store across town has it on sale for $2.89 a pound, which is cheaper than your usual neighborhood store, which sells it for $2.99 a pound. Is it worth the extra drive? First,

    asked on February 10, 2017
  17. Math Probabilities

    A bag contains 9 red chips and 12 blue chips. Two chips are selected randomly without replacement from the bag. What is the probability that the two chips are the same color? That would be the probability of two reds PLUS the probability of two blues. The

    asked on March 6, 2007
  18. Chemistry

    A chemist needs to prepare a buffer using the carbonate system (information in the table below) with a final pH of 6. Which components should they mix in water to product this buffer? H2CO3 HCO3- CO32- pKa 6.35 10.33 N/A

    asked on November 26, 2015
  19. math

    4. Point E is located at (–2, 2) and point F is located at (4, –6). What is the distance between points E and F? a. square root of 52 b. square root of 28 c. 10 d. square root of 20 5. In which quadrant is the point (x, y) located if x is negative and

    asked on October 3, 2012
  20. math-precalculus

    Outside temperature over a day can be modeled as a sinusoidal function. Suppose you know the temperature varies between 73 and 87 degrees during the day and the average daily temperature first occurs at 8 AM. How many hours after midnight, to two decimal

    asked on April 27, 2017
  21. science

    Recall from previous activities in this lesson which era is sometimes referred to as the Age of Mammals. Locate and click on this section of the geologic time scale, and list the other possible names that could have been used to describe this era, and why?

    asked on May 1, 2017
  22. physics

    A point charge Q= 4.60 uC is held fixed at the origin. A second point charge q=1.20 uC with mass of 2.80 * 10^-4 is placed on the x-axis 0.250 m away from the origin. (b) The second point charge is released from rest. What is its speed withn its distance

    asked on January 28, 2008
  23. Math

    There were 7 times as many marbles in Box A as in Box B. After Joyce transferred 294 marbles from Box A to Box B, both boxes had the same number of marbles. How man marbles were there in Box A at first.

    asked on November 20, 2013
  24. Physics

    Two small stereo speakers A and B that are 1.4 m apart are sending out sound of wavelength 34 cm in all directions and all in phase. A person at point P starts out equidistant from both speakers and walks so that he is always 1.5 m from speaker B. For what

    asked on April 21, 2008
  25. Physics

    A transformer consists of 275 primary windings and 834 secondary windings. If the potential difference across the primary coil is 25 V, (a) What is the voltage across the secondary coil? (b) what is the effective load resistance of the secondary coil if it

    asked on March 18, 2008
  26. Math

    Jerome has 1/4 of the groups video games at his house. Mario has 2/5 of the groups video games at his house. What fraction of video the groups video games is either at Jerome's house or Mario's house?

    asked on December 8, 2017
  27. trig

    Juana and Diego Gonzales, ages six and four respectively, own a strong and stubborn puppy named Corporal. It is so hard to take Corporal for a walk that they devise a scheme to use two leashes. If Juana pulls with a force of 23 lbs at an angle of 18° and

    asked on December 12, 2013
  28. Chemistry

    A chemist needs to prepare a buffer using the carbonate system (information in the table in the previous quetion) with a final pH of 10. Which components should they mix in water to product this buffer? Question options: H2CO3 HCO3- CO32-

    asked on November 26, 2015
  29. physics

    A uniform metre rule of mass 90g is pivoted at the 40cm mark. If the rule is in equilibrium with an unknown mass m placed at the 10cm mark and a 72g mass at the 70cm mark,determine m.

    asked on November 11, 2017
  30. Algebra

    I need help with my math pizzazz worksheet page 167 1.3x-5y=13 X-2y=5 2.7x-2y=-1 3x-4y=19 3.2x+3y=7 3x+4y=10

    asked on December 8, 2014
  31. Math

    The hypotenuse (side C) of a triangle is 13 inches long. Which of the following pairs of measurements could be correct for the lengths of the other two sides of the triangle? (Note: N + 82 =C2) A. 2.5 inches,4 inches B. 2.5 inches, 6 inches C.5inches,

    asked on July 22, 2014
  32. icp

    Charge q is 1 unit of distance away from the source charge S. Charge p is six times further away. The force exerted between S and q is _____ the force exerted between S and p.

    asked on September 20, 2010
  33. Physics

    Coherent light of frequency 6.32 * 10^14 Hz passes through two thin slits and falls on a screen 85 cm away. You observe that the third bright fringe occurs at +- (plus or minus) 3.11 cm on either side of the central bright fringe. (a) How far apart are the

    asked on April 21, 2008
  34. math

    The standard deviation of a sample taken from population A is 17.6 for a sample of 25. The standard deviation of a sample taken from population B is 21.2 for a sample of 30. The standard deviation of the sample mean differences is_____. (Round your answer

    asked on July 15, 2015
  35. Wold History

    Having a hard time in World History! Please let me know if these are right and if not please tell me the answers! 1. How did the religious beliefs of the ancient Israelites differ from those of other nearby peoples? The Israelites believed in many gods,

    asked on September 22, 2016

    a block is given an initial velocity of 3 m/s up the 22 degree plane. A.) How far up will the plane go B.) How much time elapses before it returns to its starting point. IGNORE FRICTION A) I got 1.2m B.) I got 1.6s I'm confused on this question: Both

    asked on February 24, 2016
  37. Math

    A, B, C, and D are points on a line, and the lengths of the line segments are: AB = 12, BC = 4, CD = 7, and DA = 15. Which of the following is a possible order for the points? A.A,B,C,D B. A,C,D,B C. A,D,C,B D. A,C,B,D

    asked on July 22, 2014
  38. AP Calculus

    Ship A is sailing due west at 8km/hr when it sees ship B northwest of its present position. If ship B is sailing due south at 3km/hr, then how close will they come on their courses?

    asked on January 9, 2017
  39. Physics

    A mirror on the passenger side of your car is convex and has a radius of curvature with magnitude 18 cm. (a)Another car is seen in this side mirror and is 13 m behind the mirror, if the car is 1.5 m tall, what is the height of its image? I can't figure

    asked on April 7, 2008
  40. Chem

    joules needed to melt 30.0 g of ice at 0 ∘C and to warm the liquid to 60.0 ∘C so i did Q=mFf which i set up like 30.g x 334 j/c = 10020 J then i'm sorta confused what i'm doing next. explain in detail please?

    asked on February 15, 2016
  41. Chemistry

    Assume you have prepared 100.0 mL of a buffer solution using 0.400 mol of acetic acid (pKa = 4.74) and 0.400 mol of sodium acetate. The pH of this buffer solution is initially 4.74. After preparing this buffer solution, you added 55.0 mL of a 1.10 M NaOH

    asked on November 26, 2015
  42. orgo

    A sample of naphthalene, which should be pure white, was found to have a grayish color after the usual purification procedure. The melting point was correct, and the melting point range was small. Explain the gray color.

    asked on January 30, 2013
  43. Chemistry

    When normal atmospheric conditions are present, water is constantly being cycled between liquid and gaseous states by which of the following pairs of processes? A. Turgor pressure and filtration B. Melting point and condensation C. Evaporation and

    asked on July 27, 2014
  44. Physics

    In designing a velocity selector that uses uniform perpendicular electric and magnetic fields, you want to select positive ions of charge +5e that are traveling perpendicular to the fields at 8.75 km/s. The magnetic field availabe to you has a magnitude of

    asked on February 18, 2008
  45. math

    your brother is 1/3 your age.your sister is 6 years older than your brother. your sister is 10 years old. write and solve and equation to find your age a

    asked on January 31, 2017
  46. physics

    A 4kg object is subjected to two forces, F1=2Ni-3Nj, and F2=4Ni-11Nj. The object is at rest at the origin at t=0. What is the objects acceleration? I know you use F=m*a Do you add the two F vectors together & take the square root to find the sum of F? ex:

    asked on September 19, 2010
  47. Algebra 2

    What would be a real life example for the functions y=5x and y=5/x?

    asked on April 3, 2019
  48. managerial economics

    A firm uses a single plant with costs C= 160 +16Q +.1Q2 and faces the price equation P= 96 – .4Q. a) Find the firm’s profit-maximizing price and quantity. What is the profit? b) The firm’s production manager claims that the firm’s average cost of

    asked on April 11, 2010
  49. physics

    A parallel plate capacitor having plates 6.0 cm apart is connected across the terminals of a 12.0 V battery. (a) Being as quantitative as you can, describe the location and shape of the equipotential surface that is at a potential of +6.0 V relative to the

    asked on January 28, 2008
  50. Physics

    A laser used to weld detached retinas emits light with a wavelength of 652 nm in pulses that are 20 ms in duration. THe average power expended during each pulse is .600 W. (a) How much energy is in each pulse, in joules and electron volts? (b) What is the

    asked on April 28, 2008
  51. physics

    An object traveling 200 feet per second slows to 50 feet per second in 5 seconds. Calculate the acceleration of the object.

    asked on March 28, 2011
  52. physics

    (a) How many excess electrons must be distributed uniformly within the volume of an isolated plastic sphere 30.0 cm in diameter to produce an electric field of 1150 N/C just outside the surface of the sphere? (b) what is the electric field at a point 10.0

    asked on January 27, 2008
  53. civics

    Please check my answers! 1. The Nineteenth Amendment granted women the right to vote, but women had been fighting for years for this right. Before the Nineteenth Amendment was passed, which existing amendment could women have used to argue that they should

    asked on December 2, 2015
  54. College Math

    farmer wishes to fence a rectangular area along the river bank. No fence is required on the side adjacent to the river. The material for the fence costs P16.00 per meter for the side parallel to the river, P12.00 per meter for the side perpendicular to the

    asked on August 25, 2010
  55. Chemistry

    If you want to prepare 2.0 liters of a .25 M solution of NH4Cl, how many grams of the salt should you weigh out?

    asked on November 29, 2015
  56. Physics

    A wooden boxcar is moving along a straight railroad track at speed v1. A sniper fires a bullet (initial speed v2) at it from a high-powered rifle. The bullet passes though both lengthwise walls of the car, its entrance and exit holes being exactly opposite

    asked on September 18, 2010
  57. Physics

    We can reasonaly model a 75 W incandescent lightbulb as a sphere 6 cm in diameter. Typically, only about 5% of the energy goes to visible light; the rest goes largely to nonvisible infrared radiation. (a) What is the visible light intensity (in W/m^2) at

    asked on March 31, 2008
  58. Calculus grade 12

    Explain why three directional vectors of the plane cannot me mutually perpendicular .

    asked on May 4, 2012
  59. organ chem

    Why is thymol only slightly soluble in water, but very soluble in 1.0 M NaOH?

    asked on January 31, 2010
  60. compose

    if 3.85 L of carbon monoxide was collected over water at 25 degrees celsius and 689 mmHg how many grams of formic acid were consumed?

    asked on December 8, 2009
  61. chemistry

    An aqueous solution with a pH of 3.00 is diluted from 2.0 L to 4.0 L. Wht is the pH of the diluted solution?

    asked on May 5, 2009
  62. physics

    A neutral conductor completely encloses a hole inside of it. You observe the outer surface of this conductor carries a charge of -12 uC. (a) Can you conclude that there is a charge inside the hole? If so, what is the charge? (b) How much charge is on the

    asked on January 28, 2008
  63. physics

    A car with a mass of 1000kg is travelling at a constant velocity. The force from the engine is 200Newtons. Calculate the acceleration of the car using the formula f=ma. How long will it take this car to travel 0-60 mph (n.b. 1mph = 0.45m/s)

    asked on May 16, 2013
  64. Math

    You need to replace the molding around a floor that is 15 ft. long & 23 ft. 6 in. wide. The molding sells for $0.50 per ft.. How much will the molding cost?

    asked on August 18, 2010
  65. Radiometric (Radioactive) Dating

    How old is a sample that contains 125 atoms of U-235 and 375 atoms of Pb-207? ...Given that the half life values on my handout are 713 million years. *I do not even know where to start so could you please explain in steps too? Thanks.

    asked on March 29, 2015
  66. physics

    a driver releases an air bubble of volume 2.0 cm^3 from a depth of 15 m below the surface of a lake where the temperature is 70C.

    asked on June 21, 2011
  67. Physics

    You want to take a full length photo of your friend who is 2 m tall, using a 35 mm camera having a 50 mm lens. The image dimensions of 35 mm film is 24 mm by 36 mm, and you want to make this a vertical photo in which your friend's image completely fills

    asked on April 14, 2008
  68. Physics

    Ronald Johnson, who is 80.0 kg, is running at 4.00 m/s when he suddenly jumps onto a stationary playground merry-go-round at a distance 1.50 m from the axis of rotation of the merry-go-round. Ronald Johnson is traveling tangentially to the edge of the

    asked on February 20, 2019
  69. 7th grade ss unit 1 lesson 13 test

    I am stuck on the test ss 2b one the lesson 13 test Why is mining important to the economy of the Untied states? I but mineral I am so stuck on this test

    asked on March 6, 2017
  70. Math - Statistics

    Suppose that the mean number of customers who arrive at the check-out counters each minute is 4. Create a Poisson Distribution with u (lamda) = 4 for x = 0 to 20. Compare your results to the histogram. 20 random numbers are generated with a Poisson

    asked on December 6, 2007
  71. Chemistry

    The pH of a buffer can be predicted using the Hendersen-Hasselbach equation: pH=pKa+ log([conjugate base][conjugate acid]) The choice of the conjugate acid-base pair (as you did in the previous questions) determines the pKa value to be used in the H-H

    asked on November 26, 2015
  72. Pre-Calc (Circles). Please help :(

    Five concentric circles with radii 1, 2, 3, 4, and 5 are drawn as shown dividing the circle of radius 5 into five regions: a circle of radius 1 and 4 annuuli (rings). What is the probability that a point chosen randomly from within the circle of radius 5

    asked on September 28, 2014
  73. physics

    Calculate the energy released in the fusion reaction 2 3 4 1 1 H + 1 H->2 H +0 n. The atomic mass of 3 1 H (tritium is 3.016049 u. I am lost! help please!

    asked on May 5, 2008
  74. Biology

    In an experiment, a researcher counts the number of oxygen bubbles produced by water plants placed under different colors of light. The researcher finds that water plants placed under white light release more oxygen bubbles than water plants placed under

    asked on July 27, 2014
  75. chem

    .070g caffeine dissolved in 4 mL water. caffeine is extracted from aqueous solution 3 times with 2mL portions of methylene chloride. calculate total amount of caffeine that can be extracted into the 3 portions. caffeine has a distribution coefficient of

    asked on February 8, 2010
  76. calculus

    Carbon-14 is a radioactive substance produced in the Earth's atmosphere and then absorbed by plants and animals on the surface of the earth. It has a half-life (the time it takes for half the amount of a sample to decay) of approximately 5730 years. Using

    asked on July 24, 2009
  77. math

    What would be a real life example for the functions y=5x and y=5/x

    asked on April 3, 2019
  78. chemistry

    Describe how to prepare 1 liter of 0.5N solution of HCl from concentrated HCl. H=1, Cl=35.5, spgr=1.19, 37.2%

    asked on September 7, 2010

    A banked circular highway curve is designed for traffic moving at 60 km/h. The radius of the curve is 205 m. Traffic is moving along the highway at 40 km/h on a rainy day. What is the minimum coefficient of friction between tires and road that will allow

    asked on December 4, 2008
  80. arithmetic

    How do I solve these questions? 3 1/3 - 2 2/5= 2.75 + .003 + .158 = 7/20 is equal to ? What is the value of the expression 2x2+ 3xy – 4y2 when x = 2 and y = - 4? 16x - 8 = If 2x – 3(x + 4) = - 5, then x = – 3(5 – 6) – 4(2 – 3) =

    asked on February 3, 2011
  81. Physics

    When a solar flare erupts on the surface of the sun, how many minutes after it occurs does its light show up in an astronomer's telescope on earth? I am totally confused..help!

    asked on March 31, 2008
  82. chemistry

    Using the volume 1.42mL of 95% ethyl alcohol that's required to dissolve 0.3g at 78 C, how do i find how much sulfanilamide that will remain in the mother liquor after the mixture is cooled to 0 C? (at 0 degrees=14mg/mL is the solubility) thanks

    asked on February 3, 2010
  83. organ chem

    Using the volume 1.42mL of 95% ethyl alcohol that's required to dissolve 0.3g at 78 C, how do i find how much sulfanilamide that will remain in the mother liquor after the mixture is cooled to 0 C? (at 0 degrees=14mg/mL is the solubility) thanks

    asked on February 3, 2010
  84. W

    Some people in a hotel are dropping water balloons from their window onto the ground below. The balloons take .15s to pass your 1.6m tall window. Where should security look for the raucous guest? Express your answer using tow significant figures.

    asked on September 23, 2015
  85. physics

    A wooden crate weighs 780 lb. What force is needed to start the crate sliding on a wooden floor when the coefficient of starting friction is 0.40?

    asked on February 22, 2013
  86. Physics

    Find the forces exerted by the two supports of a 4.0m, 50-kg diving board when a 60-kg woman stands at its end. The two supports are 0.8m apart. This time consider the mass of the diving board.

    asked on June 24, 2012

    A) As a wind instrument warms up, the resonant frequencies of the instrument tend to slightly decrease. B) If the air in a concert hall warms up, the resonant frequencies of the string instruments will change precisely the same as the resonant frequencies

    asked on April 15, 2011
  88. calculus

    A rectangular box is to be constructed from two different materials. The box will have a square base and open top. The material for the bottom costs $4.25/m2. The material for the sides costs $2.50/m2. Find the dimensions of the box with the largest volume

    asked on April 9, 2011
  89. physics

    A sample of charcoal from an archaeological site contains 55 g of carbon and decays at a rate of .877 Bq. How old is it? ok I am totally lost, I don't know where to start

    asked on May 5, 2008
  90. Chemistry

    Determine the mass of NH2CH2CO2Na and the volume of 0.150 M HCl solution required to make 1.35 L of a buffer solution at pH=10.75 and at a total concentration of 0.33 M. pKa(NH2CH2CO2H)=9.88. a.Mass of NH2CH2CO2Na: b. Volume of HCl solution: Hi Im sooo

    asked on November 16, 2016
  91. Science

    A 6.90-g sample of solid NiSO4·6H2O was heated such that the water turned to steam and was driven off. Assuming ideal behavior, what volume would that steam occupy at 1.00 atm and 100.0 °C?

    asked on November 19, 2015
  92. Chemistry

    Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) PCl3(g)+Cl2(g) Kc=1.80 at 250 degrees Celsius A 0.222 mol sample of PCl5(g) is injected into an empty 3.25 L reaction vessel held at 250 °C. Calculate the concentrations of

    asked on March 3, 2013
  93. physics

    A truck covers 40.0 m in 7.00 s while smoothly slowing down to a final velocity of 2.45 m/s.

    asked on September 16, 2010
  94. chem

    .070g caffeine dissolved in 4 mL water. caffeine is extracted from aqueous solution 3 times with 2mL portions of methylene chloride. calculate total amount of caffeine that can be extracted into the 3 portions. caffeine has a distribution coefficient of

    asked on February 8, 2010
  95. AP Physics

    While two forces act on it, a particle is to move at the constant velocity v = (3 m/s) i - (4 m/s) j. One of the forces is F1 = (2 N) i + (- 6 N) j. What is the other force? ( _____ N) i + ( _____ N) j Only two horizontal forces act on a 3.0 kg body that

    asked on November 13, 2008
  96. Physics

    The internal resistance of a dry cell increases gradually with age, even though the cell is not used. The emf, however, remains fairly constant at 1.5 V. Dry cells must be tested for age at the time of purchase by connecting an ammeter directly across the

    asked on February 12, 2008
  97. Physics

    A 450 uF capacitor is charged to 295 V. Then a wire is connected between the plates. How many joules of thermal energy are produced as the capacitor discharges if all of the energy that was stored goes into heating the wire? I am totally confused I don't

    asked on February 4, 2008
  98. Science/Biology/Physics

    1. Giraffes have long necks that allow them to reach more food sources in their habitat. The long neck trait is an example of A. selection. B. adaptation. C. radiation. D. homology. 2. Which of the following is the most common kind of chemical bond in

    asked on July 23, 2014
  99. chemistry

    The simple rule “Like dissolves like” is often used to describe the solubility of a substance in different solvents. Write a short paragraph discussing your evidence for this rule. Include in your discussion where you think this rule works best and

    asked on February 27, 2011
  100. Physics

    A coil of wire with 200 circular turns of radius of 3 cm is in a uniform magnetic field along the axis of the coil. the coil has R=40 ohms. At what rate, in Teslas per second, must the magnetic field be changing to induce a current of .150 A in the coil? I

    asked on March 3, 2008


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