Popular questions and responses by Anne
  1. Physics

    The drawing shows a square, each side of which has a length of L = 0.25 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a third charge q3 = -7.00 10-9 C placed at corner A and then

    asked on January 30, 2012
  2. electric circuit

    Some types of fuses used to protect electric meters have resistances of several ohms. Is this objectionable (a) in ammeter circuits and (b) in voltmeter circuits? Why?

    asked on July 29, 2014
  3. Chemistry

    The SI unit of length is a meter, which is defined as the length equal to 1,650,763.73 wavelengths of light emitted by a particular energy transition in krypton atoms. Calculate the frequency of the light to three significant figures.

    asked on October 31, 2012
  4. Algebra

    An airplane flies 165 miles from point A in the direction 130 degrees and then travels in the direction 245 degrees for 80 miles. Approximately how far is the airplane from A?

    asked on April 24, 2015
  5. English

    What are some similarities and differences between Emerson's beliefs and Thoreau's beliefs?

    asked on December 9, 2019
  6. Physics

    An electron is released from rest at the negative plate of a parallel plate capacitor and accelerates to the positive plate (see the drawing). The plates are separated by a distance of 1.4 cm, and the electric field within the capacitor has a magnitude of

    asked on February 1, 2012
  7. english

    what roles are played by the female characters you encountered in this unit? describe some of these females characters, their traits, and the roles they played within the selections you read, especially considering that all of those selections had male

    asked on December 19, 2017

    6. The following words share a denotative meaning. Which one has a negative connotation? (1 point) confident certain decisive demanding ~ 7. Read the following Chippewa song. Identify its purpose. A loon I thought it was But it was My love's splashing oar.

    asked on September 23, 2012
  9. Physics

    Help!! I would greatly appreciate help with this question. Consider a pulse of laser light aimed at the Moon that bounces back to Earth. The distance between Earth and the Moon is 3.84 * 108 m. Show that the round-trip time for the light is 2.56s.

    asked on December 4, 2014
  10. Math

    a 25.00 gram sample is placed in a graduated cylinder and then the cylinder is filled to the 50.0 mL mark with benzene. the mass of benzene and solid together is 58.80 gram. assuming that the solid is insoluble in benzene and that the density of benzene is

    asked on August 23, 2010
  11. Chemistry

    A solution containing a mixture of 0.0381 M potassium chromate (K2CrO4) and 0.0769 M sodium oxalate (Na2C2O4) was titrated with a solution of barium chloride (BaCl2) for the purpose of separating CrO42– and C2O42– by precipitation with the Ba2 cation.

    asked on October 15, 2015
  12. Math

    In a hardware store the ratio of shovels to rakes is 3:5. If there are 10 more rakes than shovels, how many rakes are there in the hardware store? I know shovels = r-10 but don't know where to go from there?

    asked on June 30, 2014
  13. Math

    If 8,x,y,z and 20 are in A.P.find x,y,z

    asked on March 19, 2016
  14. science

    4. When a fan is turned on, it changes electrical energy into ______ energy. A. motion B. magnetic C. gravitational D. electromagnet 5. An experiment discovered that a particular material was a poor conductor of electricity. This material would most likely

    asked on April 16, 2015
  15. differential equation

    in the theory of learning the rate at which the subject is memorized is assumed to be directly proportional to the amount left to be memorized. also the rate at which the subject is forgotten is directly proportional to the amount memorized in their time

    asked on October 26, 2014
  16. Physics

    A car is being driven along a country road on a dark and rainy night at a speed of 20 m/s. The section of road is horizontal and straight. The driver sees that a tree has fallen and covered the road ahead. Panicking, the driver locks the breaks at a

    asked on November 6, 2011
  17. physics

    While you sleep, your body is using energy at a rate of 77 W. How many food calories are used during an eight hour period? One food calorie is equal to 4186 joules.

    asked on November 6, 2011
  18. Physics

    A 18 kg child slides down a 4.0 m-high playground slide. She starts from rest, and her speed at the bottom is 2.8 m/s. What is the change in the thermal energy of the slide and the seat of her pants?

    asked on May 14, 2011
  19. Math

    A boat, whose speed in still water is 2.80m/s , must cross a 280m wide river and arrive at a point 120m upstream from where it starts. To do so, the pilot must head the boat at a 45.0 degrees upstream angle. What is the speed of the river's current?

    asked on September 12, 2009
  20. geometry

    Hi can you please help me with this thank you The area of a triangle is 4 times the area of the smaller triangle formed by joining the midpoints of two sides True or false. Draw a counterexample to show if it's false.

    asked on June 18, 2020
  21. maths

    proof that tanx + secx -1/tanx - secx+1 = 1+sinx/cosx

    asked on June 26, 2018
  22. Government

    Pluralists believe that the dominant player in American politics is (1 point) the president. groups. the government. rich individuals. the media. All of the following are generally more true of Americans than Europeans EXCEPT (1 point) they volunteer more

    asked on October 24, 2012
  23. chemistry

    If an alcohol solution has a pH of 5 would it be a primary, secondary or tertiary alcohol or a phenol?

    asked on January 18, 2011
  24. math

    a cold front moves in at noon and in 5 hours, the temperature had dropped 23%. the temperature at 5:00 p.m. was 14%. let x be the temperature at noon. write an equation to find x.

    asked on November 30, 2010
  25. Science-Chemistry

    1)Fill in the blanks. In a liquid, particles are _____arranged. They move about in ____ directions and slide over one another. Can I say "irregularly" & "any" as the answers? I know "random directions" is better, but can we accept "any directions"? 2) When

    asked on January 26, 2009
  26. Geometry

    Find the area of the shaded region, if the rectangle has dimensions 8m and 18m and the circle is inscribed in the rectangle. I just need an example on how to solve for this. I'm pretty bad at following without examples and my book doesn't show one.

    asked on July 14, 2016
  27. algebra

    a cheetah ran 300 feet in 2.92 seconds. What was the cheetahs average speed in miles per hour? Please show steps.THANKS!!

    asked on May 30, 2016

    A 15g bullet is fired horizontally into a block of wood with a mass of 2.5 k and embedded in the block. Initially the block of wood hangs vertically and the impact causes the block o swing so that its center of mass rises 15cm. find the velocity of the

    asked on August 6, 2014
  29. Math

    There are 12 girls and 9 boys in Mrs. Johnson's classroom. She said that if she randomly selects one student from her classroom the probability that it is a boy is 3/4. Which mistake did Mrs. Johnson make? A. She divided the number of girls by the total

    asked on March 20, 2013

    Briefly describe Poe’s requirements for the short story genre.

    asked on October 2, 2012
  31. College Biology help!

    Is this true? Explain. To make a 100 osmolar solution of magnesium chloride, 60g of the salt are placed in a liter of water.

    asked on September 5, 2012
  32. Chemistry

    Write the reversible equation for the esterification and hydrolysis of glyceryl ethanoate

    asked on February 7, 2011
  33. math

    Students noticed that the path of water from a water fountain seemed to form a parabolic arc. They set a flat surface at the level of the water spout and measured the maximum height of the water from the flat surface as 6 inches and the distance from the

    asked on November 14, 2016
  34. physics

    1)An elastic material has a length of 36cm when a load of 40N is hung on it and a length of 45cm when a load of 60N is hung on it. The original length of spring is? 2)A force of 100N stretches an elastic spring to a total of 20cm. If an additional force of

    asked on April 9, 2013
  35. algebra

    solve the inequality and write the solution set using interval notation. 4x+7

    asked on September 15, 2012
  36. Physics

    Two point charges are fixed on the y axis: a negative point charge q1 = -26 µC at y1 = +0.21 m and a positive point charge q2 at y2 = +0.38 m. A third point charge q = +8.5 µC is fixed at the origin. The net electrostatic force exerted on the charge q by

    asked on January 24, 2012
  37. urgent math

    find the equilibrium point for the demand and supply functions D(p)=79-8p and S(p)=37+6p, where p is the price, in dollars, D(p) is the number of units demanded, and S(p) is the number of units supplied.

    asked on December 8, 2011
  38. Physics

    Suppose the stone is thrown at an angle of 32.0° below the horizontal from the same building (h = 49.0 m) as in the example above. If it strikes the ground 69.3 m away, find the following. (Hint: For part (a), use the equation for the x-displacement to

    asked on May 17, 2011
  39. Chemistry-atoms

    A. How many protons are in one atom of fluorine - 19? B. How many neutrons are in one atom of potassium - 39? C. How many electrons are in one neutral atom of V - 51? D. What is the symbol for the element that has 78 protons? E. What is the symbol for the

    asked on April 14, 2011
  40. physics

    A carton lies on a plane tilted at an angle theta 29 degrees to the horizontal, with a friction of uk .12.If the carton starts from rest 7.90 up the plane from its base, what will be the carton's speed when it reaches the bottom of the incline?

    asked on October 15, 2010
  41. trig

    Prove that tan4x=(4tanx-tan^3x)/(1-6tan^2 x+tan^4 x) *note: the exponents are just numbers. there are no variables in the exponents.

    asked on March 27, 2010
  42. PHysics

    a 15g bullet strikes and becomes embedded in a 1.1kg block of wood placed on a surface in front of the gun. if the coefficient of kinetic friction between the block and the surface is 0.25 and the impact drives the block a distance of 95m before it comes

    asked on December 6, 2008
  43. Chemistry - Thermodynamics

    The heat capacity of a bomb calorimeter is 87.5 kJ/K (this value is for the total heat capacity including that of the water jacket around the reaction chamber). If 67.2g of CH4 (g), is combusted under such reaction conditions, what will be the increase in

    asked on December 12, 2007
  44. Calculus

    I have to get the result of the serie from 1 to infinite of |sin(4n/π) +3|/ 4^n I really don't know what to do... Please I would really appreciate if anyone can help me

    asked on June 1, 2017
  45. Math

    Adam cuts the cake into equal-sized pieces. Each piece has a length of 5 centimeters, a width of 5 centimeters, and a height of 3 centimeters. How many pieces of cake does Adam have? I stated 75, I used the volume equation l x w x h.

    asked on February 21, 2017
  46. Physics

    An electric heater the temperature of 120g of water in a thin light vessel through 10k in 2 minutes, when placed in 70g of water contained in a metal vessel of mass 0.55kg the temperature rises through 9k in the same time. Calculate from the above The heat

    asked on February 21, 2017
  47. algebra

    Write a compound inequality that the graph could represent. Please exlain and show if you can. Thank you...

    asked on May 30, 2016
  48. physics

    The radius of a roll of paper is 7.6 cm and its moment of inertia is I = 2.9 × 10^3 kg·m2. A force of 3.2 N is exerted on the end of the roll for 1.3 s, but the paper does not tear so it begins to unroll. A constant friction torque of 0.11 m·N is

    asked on May 8, 2016
  49. Math please help.

    Find the function that has the greater rate of change As x increases by 1, y increases by 3. The graph- x: -1 | 0 | 1 y: 0 | 2 | 4 A. the slopes are equal B. the graph has a greater slope C. the function rule has a greater slope**** D. none of the above

    asked on May 3, 2015
  50. math

    Juan lives 2.5 miles to the park. It took him 12 minutes to ride his bike to the park. What was his average speed in miles per hour

    asked on November 29, 2014
  51. Chemistry

    How is the atomic structure of a Copper differ from Germanium, Silicon and Gallium Arsenide ? Tnx :))

    asked on July 4, 2014
  52. math

    One week Trey rented 4 DVDs and 2 video games for $18. The next week he rented 2 DVDs and 1 video game for $9. Find the rental costs for each video game and DVD.

    asked on January 22, 2014
  53. Physics

    Suppose you walk 18.0m straight west and then 25.0 m straight north. How far are you from your starting point and what is the compass direction of a line connecting your starting point to your final position>

    asked on June 11, 2013
  54. Physics

    A cannonball is fired with a velocity of 200 m/s at an angle of 25 degrees above the ground. After the total flight of 45.6 seconds, the cannonball returns to the ground. Calculate: the initial horizontal and vertical components of the velocity, the

    asked on October 23, 2012
  55. Physics

    A tall strongman of mass m = 93 kg stands upon a scale while at the same time pushing on the ceiling in a small room.If the scale reads 1062 N (about 239 lb), what is the magnitude of the normal force that the ceiling exerts on the strongman?

    asked on September 21, 2012
  56. Accounting

    Please prepare the following journal entries. Indicate which account should be debited and which account should be credited along with the dollar amount of the debit and credit. a) Investors invested $100,000 in exchange for 10,000 shares of common stock.

    asked on April 19, 2012
  57. Physics

    A 30.0 kg box is being pulled across a carpeted floor by a horizontal force of 230 N., against a friction force of 210 N. Calculate the acceleration of the box and find the x and y components of the acceleration of the box. Align the positive direction

    asked on March 26, 2012
  58. physics

    A balloon rubbed against denim gains a charge of -9 µC. What is the electric force between the balloon and the denim when the two are separated by a distance of 5 cm.

    asked on March 1, 2012
  59. Chemistry

    How to prepare 1L of 96% v/v ethanol from 99% v/v ethanol? Can you show me the calculation steps?Thanks.

    asked on February 15, 2012
  60. 11th grade

    4. The use of technology such as telephones and computers means that money exchanges and other financial transactions can be a. based on the U.S. dollar all over the world. b. converted to prices in any currency. c. made instantaneously. d.sensitive to

    asked on December 21, 2010
  61. Physics

    As you approach the I-90 exit in your uncle's little red sports car convertible, you happen to notice a cat crossing the road. Not that you have any particular love of cats (especially this one, whose snooty disposition seems to beckon for a game of

    asked on November 1, 2010
  62. geometry

    prove the following statements using a coordinate proof. the diagonals of a rectangle bisect each other.

    asked on February 2, 2008
  63. General Chem - Electrochemistry

    Give the cell diagram notation of the electrochemical cell that could be used to determine experimentally the dissociation constant (Kw) of water. The standard reduction potential for O2 + H20 + 4 e- ----> 4OH- is 0.40 V For other possible half-reactions,

    asked on December 12, 2007
  64. science

    True or False: Drag and tailwind are examples of a contact force.

    asked on December 16, 2019
  65. Math

    Find the volume of a spherical cone in a sphere of radius 17 cm. if the radius of its zone is 8 cm.

    asked on May 22, 2018
  66. Biology

    A farmer wants to propagate a good variety of a crop in a way which maintained all its desirable traits. Which of the following methods should be used? A. Self Pollination B. Vegetative propagation C. Growing seeds produced from this variety D.

    asked on September 30, 2017
  67. Biology

    A farmer grew only one type of onion. All of the onion plants died from the same disease. What can be said of this onion plant population. A. Only few plants were resistant to the disease B. All of the onion plants were resistant to the disease. C. The

    asked on September 30, 2017
  68. Chem

    How would the pressure of a gas change if suddenly the intermolecular forces were repulsive rather than attractive?

    asked on December 6, 2016
  69. Chem

    suggest an explanation for the ideal nature of helium compared to the other gases

    asked on December 6, 2016
  70. Math

    A total of 45 412 runners participated in the Vancouver Sun Run. Of these runners, 0.85% completed the run in under 40 min. How many runners completed in under 40 mins? In fact, 0.13% of the runners completed the run in less than 34 min. How many runners

    asked on October 21, 2016
  71. Math Limits

    lim(as p-->4) of (p^3 - 64) / (4-p) My work: p^3 - 64 = (p-4)(p^2 + 4p + 16) 4 - p = -(p-4) ((p-4)(p^2 + 4p + 16)) / -(p-4) p-4 cancels out -(p^2 + 4p + 16) -((4)^2 + 4(4) + 16) -(16 + 16 + 16) - 48 Is this right?

    asked on October 17, 2016
  72. Math

    Hello, I'm supposed to do the following questions for the equation y=cos(pi/3)x for intervals [0,6] a) For what values of x does the instantaneous rate of change appear to equal 0? b) For what value(s) of x does the instantaneous rate of change appear to

    asked on August 24, 2016
  73. algebra

    Question 8: What is the value of c such that: x2 + 14x + c, is a perfect-square trinomial? a. 7 b. 98 c. 196 d. 49

    asked on June 1, 2016
  74. algebra 1

    What is the simplified form of the expression? x^8*2y^10*5x^5

    asked on June 1, 2016
  75. Algebra

    A taco stand sells tacos for $3.35 easch. The stands expenses for the day are $210. Define our variables and write an inequality to represent the amount of tacos they need to sell per day to make a profit, and then solve the inequality. Provide your

    asked on May 30, 2016
  76. Algebra

    Your friend claims that she has a bag of 30 coins containing nickels, dimes, and quarters. The total value of the 30 coins is $3. There are twice as many nickels as there are dimes. Is your friend correct? Explain your reasoning

    asked on September 6, 2015
  77. physics

    Two workers pull horizontally on a heavy box, but one pulls twice as hard as the other. The larger pull is directed at 25.0 degrees west of north, and the resultant of these two pulls is 350.0 N directly northward. Use vector components to find the

    asked on August 18, 2015
  78. physics

    A capacitor is rolled from two strips of aluminum separated by two strips of paraffin-coated paper. Each strip is 5.40cm wide. The foil is 7.00μm thick, and the paper is 50.0μm thick. What length, in cm, should the strips be if a capacitance of 24.0nF is

    asked on January 30, 2015
  79. Statistics

    The marks of 100 students in an examination are normally distributed with mean of 25 marks and a standard deviation of 10 marks. (a) Given that the pass mark is 20, estimate the number of students who passed the examination. (b) If 5.59% of the students

    asked on October 23, 2014
  80. math

    your team has two x·sq-tiles, three x-tiles, and one unit tile on his desk and another person has one x·sq- tile, five x-tiles, and eight unit tiles on her desk. You decide to put all of the tiles together on one desk. What is the name for this new group

    asked on September 17, 2014
  81. Math

    Let n = c x p, where p is a prime number, and c is a composite number less than p. The number c has three unique prime factors. How many unique prime factor does n^2 have?

    asked on July 2, 2014
  82. physics

    Suppose that the range of output frequencies is from 47.4 Hz to 14.8 kHz for a pipe organ. Take 343 m/s for the speed of sound. (a) What is the length (in units of m) of the longest pipe open at both ends and producing sound at its fundamental frequency?

    asked on November 22, 2013
  83. Science

    Astrologers relate the location of stars and planets to events in human lives. Many years ago, people classified astrology as a science. Why do modern scientists consider astrology to be a pseudoscience A. Astrology does not involve the use of telescopes.

    asked on October 20, 2013
  84. Stats/math

    The deciles of any distribution are the 10th, 20th,...90th percentiles. The first and last deciles are the 10th and 90th percentiles, respectively. What are the first and last deciles of the standard Normal distribution? HOw would i solve this? thank you

    asked on September 14, 2013
  85. Maths A Year 12

    Four years ago, an art collector bought a painting for $32 500. He knows that this painting appreciates at 15% a year. What is this painting worth now, to the nearest $100?

    asked on June 9, 2013
  86. Maths A

    $20 000 is invested in a term deposit at 5.4% p.a. with monthly rests. What will be the value of this investment after 3 years?

    asked on June 9, 2013
  87. Math

    Ray wanted to put his tomato plants in rows with the same numbers of plants in each row. He knew that if he planted 5,6, or 7 rows of tomatoes, he would have at least one plant left over. However, his plants could be placed evenly in 8 rows. Which of the

    asked on March 30, 2013
  88. Math

    hailey wants to rake her entire yard. This morning she raked 1/3 of the yard, and this afternoon she raked another 3/5 of the yard. What fraction of her yard still needs to be raked?

    asked on March 23, 2013
  89. math

    the perimeter of a rectangle is 40 feet and its area is 96 square feet. find the length and width?

    asked on March 6, 2013
  90. Government

    The passage of the Civil War amendments—the Thirteenth, Fourteenth, and Fifteenth Amendments—did not end discrimination of African Americans. However, the Supreme Court has relied on these amendments in deciding civil rights cases such as the case of

    asked on January 5, 2013
  91. physics

    A certain car is capable of accelerating at a uniform rate of 0.93 m/s2. What is the magnitude of the car’s displacement as it accelerates uniformly from a speed of 86 km/h to one of 98 km/h? Answer in units of m

    asked on November 11, 2012
  92. Physics

    Block 1 is up an incline and is attacthed to block 2 by a rope, with m2 = 5.0 kg and è = 33°.If the coefficient of static friction between block #1 and the inclined plane is ìS = 0.24, what is the largest mass m1 for which the blocks will remain at

    asked on October 20, 2012
  93. Biology

    Scientists observe a newly established population of sexually reproducing plants growing on the shore of a small island. An observable trait of the plant has two possible phenotypes. It is determined by a single gene, with the dominant allele having

    asked on October 3, 2012
  94. Math

    A rectangular sandbox has a length of 60 inches, a width of 40 inches, and a depth of 6 inches. What is the volume in cubic inches?

    asked on August 2, 2012
  95. Chemistry

    A 1.00-L solution saturated at 25°C with calcium oxalate (CaC2O4) contains 0.0061 g of CaC2O4. The solubility constant (Ksp) for this salt is [CaC2O4=128.09 g/mol]

    asked on April 16, 2012
  96. Chemistry

    How would you find the pH of a solution prepared by mixing 50 mL of 0.125 M KOH with o.050 L of 0.125 M HCl?

    asked on April 16, 2012
  97. Physics 2

    The average intensity of light emerging from a polarizing sheet is 0.807 W/m2, and the average intensity of the horizontally polarized light incident on the sheet is 0.972 W/m2. Determine the angle that the transmission axis of the polarizing sheet makes

    asked on April 5, 2012
  98. math

    The average of two numbers is 34. The first number is three times the second number. what are the two numbers?

    asked on April 1, 2012
  99. Science-Chemistry

    In the following test for Sulfated Ash, ammonium carbonate solution was added. What is the purpose of adding ammonium carbonate solution? Heat a silica crucible to redness for 30 minutes, allow to cool in a desiccator and weigh. Place 1g of the substance

    asked on March 18, 2012
  100. math

    Solve variation problem if m varies jointly as z and p, and m=10 when z=2 and p=7.5, find m when z=5 and p=7

    asked on February 24, 2012


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