Popular questions and responses by dan
  1. Chemistry

    Identify the predominant intermolecular force in each of these substances. 1. Hydrogen 2. Dipole-Dipole 3. London A)H20 B)NH3 C)CH3 C=O OCH3 D)CH4 E)CH OH-C-OH CH3 what I have so far is A) 1 B) 1 C) 2 D) 3 E) I'm not sure about E, I think it might be

    asked on December 7, 2015
  2. English

    I need an example of a simile for 'relieved'.

    asked on March 28, 2016
  3. Physics

    Speed of Asteroids With the same Radius? Two spherical asteroids have the same radius R . Asteroid 1 has mass M and asteroid 2 has mass 2M. The two asteroids are released from rest with distance 10R between their centers. What is the speed of each asteroid

    asked on April 12, 2011
  4. Trigonometry

    a bicycle with 24inch diameter wheels is traveling at 15mi/hr. a) Find the angular speed of the wheels in rad/min. b)How many revolutions per minute do the wheels make?

    asked on April 7, 2015
  5. Physics-Resonance

    A 3.00 m long pipe is in a room where the temperature is 20 C. What is the fundamental frequency if the pipe is closed at one end? Would this count as an open pipe still, or a closed pipe? This is what I did. Wavelength = 2L/n Wavelength = 2(3)/1

    asked on February 14, 2011
  6. physics

    An object carries a charge of -8.0 uC, while another carries a charge of -2.0 uC. How many electrons must be transferred from the first object to the second so that both objects have the same charge? Qavg = (object 1 + object 2)/2 Qavg= -5uC Object 2- Qavg

    asked on July 23, 2012
  7. world issuse

    I'm a 7 letter word u read daily,my 5th 6th and 7th letter increase each year,my 3rd n 4th letter are the same,my 3rd 2nd n 5th letter cover 75% of the world.

    asked on May 24, 2011
  8. calc 1

    Gravel is being dumped from a conveyor belt at a rate of 30 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. How fast is the height of the pile increasing when the pile is 14

    asked on April 5, 2015
  9. Algebra

    If z = (x-8)/(2x) then x=?

    asked on September 21, 2015
  10. chemistry

    What is the percent yield for the reaction PCl3(g) + Cl2(g) --> PCl5(g) if 119.3 g of PCl5 are formed when 61.3 g of Cl2 react with excess PCl3? I don't understand how to set this up?

    asked on July 13, 2011
  11. Algebra

    Let L1 be the line passing through the points Q1=(−2, −3, −4) and Q2=(−5, −2, −3) and let L2 be the line passing through the point P1=(−27, 31, −25) with direction vector →d=[−6, 9, −6]T. Determine whether L1 and L2 intersect. If so,

    asked on September 25, 2018
  12. trig

    The captain of a ship at sea sights a lighthouse which is 120 feet tall. The captain measures the the angle of elevation to the top of the lighthouse to be 19 ^\circ. How far is the ship from the base of the lighthouse?

    asked on October 1, 2011
  13. physics

    The largest-caliber antiaircraft gun operated by the German air force during World War II was the 12.8 cm Flak 40. Suppose this weapon fired a 26.2 kg shell with a muzzle speed of 800 m/s. What propulsive force was necessary to attain the muzzle speed

    asked on January 6, 2013
  14. hcc

    When you add sugar to it, your cup of coffee becomes not only sweet, also fattening. which part is wrong??

    asked on September 11, 2016
  15. Science

    Hydrogen peroxide can be prepared in several ways. One method is the reaction between hydrogen and oxygen, another method is the reaction between water and oxygen. Calculate the ΔG°rxn of each reaction below? 1) H2(g) + O2(g) H2O2(l) ΔG°rxn=? (in kJ)

    asked on February 5, 2016
  16. Physics

    A golfer hits a shot to an elevated green. The ball leaves the club with an initial speed of 16 m/s at an angle of 58' above the horizontal. If the speed of the ball just before it lands is 12 m/s, what is the elevation of the green above the point where

    asked on October 10, 2017
  17. accounting

    A company purchased a machine on January 1 of the current year for $750,000. Calculate the annual depreciation expense for each year of the machine's life (estimated at 5 years or 20,000 hours, with a salvage value of $75,000). During the machine's 5-year

    asked on August 25, 2012

    A voltaic cell is constructed that is based on the following reaction. Sn2+(aq) + Pb(s) -> Sn(s) + Pb2+(aq) (a) If the concentration of Sn2+ in the cathode half-cell is 1.80 M and the cell generates an emf of +0.219 V, what is the concentration of Pb2+ in

    asked on April 6, 2012

    A voltaic cell is constructed that uses the following half-cell reactions. Cu+(aq) + e− -> Cu(s) I2(s) + 2 e− -> 2 I−(aq) The cell is operated at 298 K with [Cu+ ] = 2.7 M and [I− ] = 2.7 M. (a) Determine E for the cell at these concentrations. (b)

    asked on April 14, 2012
  20. Chemistry

    Anthracene is a yellow, crystalline solid found in coal tar. Complete this structure for anthracene, C14H10, by adding bonds and hydrogen atoms as necessary. What type of hybrid orbitals are utilized by carbon in anthracene? >>sp3 How many σ bonds and π

    asked on November 22, 2015
  21. Math

    Which of these numbers is the smallest? 0.24, 0.02, 0.11, 2, 0 (Is 0 considered to be the smallest number here?)

    asked on September 18, 2015
  22. trigonometry

    Solve the following equation for all solutions: sin(6x)cos(11x)-cos(6x)sin(11x)=-.1

    asked on May 15, 2015
  23. MaTH

    Consider the line 9x-6y=-3 . What is the slope of a line parallel to this line? What is the slope of a line perpendicular to this line?

    asked on February 18, 2013

    Consider the reaction. PbCO3(s) PbO(s) + CO2(g). calculate the equilibrium pressure of CO2 in the system at the following temperatures.(IN atm) (a) 270°C (b) 480°C ..... delta Hf(KJ/mol).. d.Gf(KJ/mol).. S(J/mol-K) PbCO3(s)..-699.1 .. -625.5 .. 131.0

    asked on March 20, 2012
  25. Math

    What is the degree of the monomial? 6x^5

    asked on May 23, 2014
  26. Physics

    A rowboat crosses a river with a velocity of 3.30 mi/h at an angle 62.5° north of west relative to the water. The river is 0.795 mi wide and carries an eastward current of 1.25 mi/h. How far upstream is the boat when it reaches the opposite shore?

    asked on January 25, 2013
  27. physics

    A thin 2kg box rests on a 6kg board 50cm long with 20cm hanging off the edge of a table. How far can the center of the box be from the end of the table before the board begins to tilt?

    asked on October 12, 2011
  28. Chemistry

    1. Which molecule should have the higher dipole moment, and why? a) COF2 because it contains more F atoms. b) COFH because the polar bonds in COF2 nearly cancel each other out. c)COF2 because it contains more lone pairs. >> I think the answer is a)?

    asked on November 22, 2015
  29. chemistry

    How many grams of O2 are required to burn 46.0 grams of C5H12?

    asked on June 22, 2011
  30. Physics

    Suppose a monatomic ideal gas is changed from state A to state D by one of the processes shown on the PV diagram. Find the total work done on the gas if it follows the constant temperature path A-C followed by the constant pressure path C-D. A = 2atm and

    asked on December 6, 2010
  31. Physics

    You are explaining why astronauts feel weightless while orbiting in the space shuttle. Your friends respond that they thought gravity was just a lot weaker up there. Convince them and yourself that it isn't so by calculating the acceleration of gravity 248

    asked on July 8, 2012
  32. math

    Alexa and Emma are looking up at their house from the backyard. From alexa's point of view, the top of the house is at an ang;e of elevation of 40 degree. From Emma's point of view, directly closer to the house, it is 60 degree. The house is 15 metres

    asked on November 2, 2012
  33. Math

    910 students in a class 2/5 are girls and 2/7 of the girls play netball. How many girls play netball

    asked on December 30, 2019
  34. linear algebra

    Let L1 be the line passing through the points Q1=(3, −3, 4) and Q2=(−3, 6, 7). Find a value of k so the line L2 passing through the point P1 = P1(−6, 11, k) with direction vector →d=[1, −1, −2]T intersects with L1. Not sure how to go on..

    asked on September 25, 2018
  35. Chemistry

    The specfic heat of iron is 0.11cal/g C. The heat of fusion of iron, the heat required to convert iron from a solid to liquid at its melting point, is 63.7cal/g. Iron melts at 1530 C. How much heat must be added to 2g of iron at 25c to completely melt it?

    asked on March 15, 2013
  36. Algebra

    The parametric equations for a line L1 are as follows: x = −1−2t y = 4+4t z = 3−2t Let L2 be the line parallel to L1 and passing through the point (2, 5, −3). Find the point P on L2 whose x-coordinate is −3. P = (−3, 0, 0)

    asked on September 25, 2018
  37. grammer

    find the error?? The client’s hospital stay was prolonged, do to a superinfection. client’s/stay was/do to

    asked on February 10, 2017
  38. chemistry

    Name and draw the molecular structure of this compound CH3CH(C2H5)CH(CH3)CH(C3H7)CH2CH3

    asked on September 19, 2015
  39. trigonometry

    Solve sin(x)=−0.89 on 0≤x

    asked on May 3, 2015
  40. trigonometry

    Find the exact value of sin(285∘)

    asked on May 17, 2015
  41. Physics

    A snowmobile, with a mass of 530 kg, applied a force of 410 N backwards on the snow. a) What force is responsible for the snowmobile’s resulting forward motion? (Hint: Think action–reaction force pairs.) b) If the force of friction on the snowmobile is

    asked on March 28, 2014
  42. Physics( Explain and choose right answer)

    A ball on the end of a rope is moving in a vertical circle near the surface of the earth. Point A F T is at the top of the circle; C is at the bottom. Points B and D are exactly halfway between A and C. Which one of the following statements concerning the

    asked on March 24, 2014
  43. Pre-Calc

    Using the difference for formula, find the tan 255. Step by step would be appreciated

    asked on December 18, 2013
  44. Physics

    A long jumper leaves the ground with an initial velocity of 12 m/s at an angle of 28-degrees above the horizontal. Determine the time of flight, the horizontal distance, and the peak height of the long-jumper.

    asked on February 26, 2013
  45. Physics

    An object carries a charge of -8.0 ìC, while another carries a charge of -2.0 ìC. How many electrons must be transferred from the first object to the second so that both objects have the same charge? Qavg = (object 1 + object 2)/2 Qavg= -5ìC Object 2-

    asked on July 23, 2012

    Use the solubility rules to predict whether the following substances are soluble or insoluble in water: a) K2CrO4 _______________ b) NiSO4 _______________ c) Cu(OH)2 ______________ d) Pb(C2H3O2)2 __________ e) Ag2CO3 _______________ f) Al2S3

    asked on May 13, 2012
  47. electrical year 2

    how do i answer this. A series RL circuit contains two resistors and two inductors.the resistors are 33 ohms and 47 ohms the inductors have inductive reactances of 60 ohms and 30 ohms. the applied voltage is 120 v. what is the voltage drop on the 33 ohm

    asked on October 23, 2017
  48. business math

    Camille Keegan sells lamps for $105.55 that cost her $75.00. Camille's percent of markup based on the selling price is:

    asked on March 22, 2016
  49. Chemistry

    A 18.7 g sample of CaCO3 was treated with aqueous H2SO4 producing calcium sulfate, water and 3.65 g of CO2(g) according to: CaCO3(s) + H2SO4(aq) -> CaSO4(s) + H2O + CO2(g). What was the percent yield of CO2?

    asked on October 26, 2015
  50. Math

    An airplane is heading north at an airspeed of 300km/ hr, but there is a wind blowing from the northwest at 50km/hr. How many degrees off course will the plane end up flying, and what is the plane's speed relative to the ground?

    asked on May 27, 2015
  51. Physics

    In an electricity experiment, a 0.900g plastic ball is suspended on a 50.0cm long string and given an electric charge. A charged rod brought near the ball exerts a horizontal electrical force F⃗ elec on it, causing the ball to swing out to a 23.0∘

    asked on December 15, 2014
  52. physics

    A cargo plane is moving with a horizontal velocity of vx = +225 m/s at a height of y = 920 m above level ground as shown in the figure below when it releases a package. Ignoring air resistance, how much time will it take the package to reach the ground?

    asked on March 26, 2013
  53. Math

    A rock band has 5 members, and 2/5 of the members play string instruments. Also, 0.4 of the members sing. Does the band have the same number of string instrument players as singers. I think no. Am i correct? Please explain it.

    asked on March 6, 2013
  54. Trig

    A pilot is flying over a straight highway. He determines the angles of depression to two mileposts, 3 mi apart, to be angle x = 31° and angle y = 49°, as shown in the figure. (Round your answers to two decimal places.) Find the distance of the plane from

    asked on February 29, 2012
  55. Physics

    A 9.60 g coin is placed 10.7 cm from the center of a turntable. The coin has a coefficient of static friction of 0.80 and a coefficient of kinetic friction of 0.60 with the turntable. The turntable's angular velocity slowly speeds up until the coin starts

    asked on October 17, 2011
  56. chem

    If ice were to be placed in a container at a temperature of -2 oC, with a water vapor pressure of 2 torr, you would see a decrease in the volume of solid ice over time.

    asked on September 6, 2010
  57. physics

    Ball 1, with a mass of 100g and traveling at 12 m/s , collides head on with ball 2, which has a mass of 340g and is initially at rest. What are the final velocities of each ball if the collision is perfectly elastic? What are the final velocities of each

    asked on October 18, 2009
  58. Algebra

    Evaluate the function at the given value of the independent variable and simplify. f(x) = 2x2 - 5x + 6; f(x - 1)

    asked on July 3, 2008
  59. Chem

    Change in enthalpy problem. Consider the reaction represented below. Referring to the data in the table below, calculate the standard enthalpy change for the reaction at 25 degrees C. O3(g)+NO(g)-->O2(g)+NO2(g) Standard enthalpy of formation in kJ/mol:

    asked on November 19, 2007

    (a) If your relaxed eye has a refractive power of 56.0 D, and your lens-to-retina distance is 2.35 cm, determine if you are nearsighted or farsighted. (b) If you are nearsighted, determine your far point. If you are farsighted, determine your near point.

    asked on December 4, 2017
  61. algebra

    a purse contains 26 coins, some of which are dimes and the rest are nickels. Altogether, the coins are worth more than $2.10. At least how many dimes are in the purse?

    asked on September 25, 2011
  62. chemistry

    iron(III) oxide reacts with carbon monoxide gas to form solid iron metal and carbon dioxide gas: Fe2O3 + 3 CO --> 2 Fe + 3 CO2 If you begin the reaction with 84.34 g of iron(III) oxide and 68.87 g of CO, which reactant will be in excess at the end of the

    asked on July 12, 2011
  63. Physics Spring

    A mass sitting on a horizontal, frictionless surface is attached to one end of a spring; the other end is fixed to a wall. 1.0 J of work is required to compress the spring by 0.12 m. If the mass is released from rest with the spring compressed, it

    asked on November 15, 2010
  64. Chemistry problem

    What is the expected freezing point of a 3.50 m aqueous solution of BaCl2 (Kfp=1.86C/m)? What is the boiling point (Kbp=0.512C/m? & which is affected to the greater extent, the boiling point or the freezing point?

    asked on November 12, 2009
  65. Physics

    This is a four part question, I need help with the fourth part. 1. I found the Gravitational Potential Energy of a gymnast at her maximum height above a trampoline to be 400J. 2. I found the Kinetic Energy of her just before she makes contact with the

    asked on November 6, 2009
  66. Chemistry

    If the column of water in the water bormeter rose to a height of 35 feet, what would the atmospheric pressure be in mm Hg?

    asked on October 21, 2008
  67. Chemistry

    A chemical technician prepares Ni(NH3)6Cl2 by adding 4.55 g of solid NiCl2·6H2O to 25 mL of 6.0 M aqueous NH3. What is the maximum mass of Ni(NH3)6Cl2 that will be produced? how would I do this question?

    asked on December 14, 2015
  68. physics

    Estimate the speed in mph with which water comes out of a garden hose using your past observations of water coming out of garden hoses and your knowledge of projectile motion. (Take the inclination angle to be 45°, the initial height to be 1.0 m, and the

    asked on September 6, 2015
  69. calc

    A company runs food service concessions for sporting events throughout the country. Their marketing research department chose a particular football stadium to test market a new jumbo hot dog. It was found that the demand for the new hot dog is given

    asked on April 6, 2015
  70. Physics

    A man is on his apartment balcony 25m above ground level. He has a fire hose aimed directly at another man who is a ground level, a horizontal distance of 35m from the apartment block. The man on the balcony opens the nozzle and water travels with a speed

    asked on February 18, 2015
  71. Chemistry

    A solution of hydrogen peroxide, H2O2, is titrated with potassium permanganate, KMnO4, according to the following equation: 5H2O2 + 2KMnO4 + 3H2SO4 = 5O2 + 2MnSO4 + 8H2O + K2SO4. It requires 46.0 mL of 0.145 Mol/L KMnO4 to titrate 50.0 mL of the solution

    asked on July 3, 2014
  72. Physics

    A satellite is given a boost of 540 MJ of energy to move it from its initial orbit at an altitude of 150 km to a higher altitude orbit. If the satellite has a mass of 1.16 ✕ 10^3 kg, what is the new altitude it reaches? Take the mass of the Earth to be

    asked on April 2, 2014
  73. Chemistry

    How many moles of gas are in a 30 liter scuba canister if the tempature of the canister is 300 k and pressure is 200 atmospheres?

    asked on March 12, 2013

    If the side chain of a glutamic acid residue has a pKa of 4.1, at pH 6.1 the ratio of uncharged to charged side chain would be about A. 100:1 B. 10:1 C. 1:1 D. 1:10 E. 1:100 -i HAVE NO IDEA Which of the following amino acids has a side chain that can serve

    asked on January 16, 2013
  75. Physics

    A railroad car moves under a grain elevator at a constant speed of 3.70 m/s. Grain drops into the car at the rate of 580 kg/min. What is the magnitude of the force needed to keep the car moving at constant speed if friction is negligible? F = Ma -> R *

    asked on May 22, 2012

    A 1.00-L solution saturated at 25°C with lead(II) iodide contains 0.54 g of PbI2. Calculate the solubility-product constant for this salt at 25°C.

    asked on March 3, 2012
  77. stats

    A final exam in Math 160 has a mean of 73 with standard deviation 7.73. Assume that a random sample of 24 students is selected and the test score of the sample is computed. Assuming the scores are normally distributed, what percentage of sample means are

    asked on January 23, 2012
  78. Physics

    Compressed air is used to fire a 41.0 g ball vertically upward from a 1.0-m-tall tube. The air exerts an upward force of 3.7 N on the ball as long as it is in the tube. How high (in m) does the ball go above the top of the tube, assuming that the

    asked on October 10, 2011
  79. math

    If a a sheet of cardboard measures 9 feet by 6 feet and is made into a perfect cube, what would the length of each edge be?

    asked on May 9, 2011
  80. Math

    The bus fare in a city is $1.75. People who use the bus have the options of purchasing a monthly coupon for $29.00. With the coupon book, the fare is reduced to $0.75. Determine the number of times in a month the bus must be used so that the total monthly

    asked on May 3, 2009
  81. American Government

    How did the Founders expect to promote civic virtue in a country as large and diverse as the United States?

    asked on August 22, 2008
  82. Chemistry (reactions)

    Ch3Ch2Ch2MgBr + H2O = I just need to complete the reaction not balance it.

    asked on April 6, 2008
  83. science

    An unknown element X forms a compound with bromine: XBr. Predict the chemical formula of the compound that element X makes with oxygen. Justify your answer.

    asked on April 27, 2020
  84. physics

    In an arcade game, a 0.12 kg disk is shot across a frictionless horizontal surface by being compressed against a spring and then released. If the spring has a spring constant of 230 N/m and is compressed from its equilibrium position by 8.0 cm, what is the

    asked on March 13, 2017
  85. language

    1:Which word is a conjunction in the sentence: The man quickly but carefully opened the oysters hard shell. A:quickly B:but C:carefully D:opened

    asked on March 2, 2017
  86. Critical thinking

    I need to identify if each premise is acceptable or unacceptable, and for this the conditions of acceptability are acceptable by observation, testimony, authoritative testimony (only use if the premise explicitly refers to an authority), and a priori And

    asked on November 5, 2015
  87. Chem

    Complete combustion of 8.30 g of a hydrocarbon produced 26.7 g of CO2 and 9.10 g of H2O. What is the empirical formula for the hydrocarbon? My Work: First I tried to find the Amount of C and H in the product... Which I got 1 Mole of Carbon and 2 moles of

    asked on October 21, 2015
  88. algebra

    A particular style of sunglasses costs the retailer $80 per pair. At what price should the retailer mark them so he can sell them at a 20% discount off the selling price and still make 30% profit on his cost?

    asked on September 30, 2015
  89. trig

    An airplane is heading north at an airspeed of 500 km/hr, but there is a wind blowing from the northwest at 50 km/hr. how many degrees off course will the plane end up flying, and what is the plane's speed relative to the ground? So here is my work...

    asked on May 28, 2015
  90. trigonometry

    A Wheel of radius 14in. is rotating 0.5 rad/sec. What is the linear speed v, the angular speed in RPM ( rev per min), and the angular speed in deg/sec?

    asked on April 8, 2015
  91. chemistry

    Not sure how to complete this chemical reaction: Li + Fe(NO3)3 --->

    asked on November 3, 2014
  92. physics

    Three forces act on a moving object. One force has a magnitude of 62.6 N and is directed due north. Another has a magnitude of 45.9 N and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the object

    asked on October 3, 2014
  93. chemistry

    Plan how you would make 100mL of a buffer solution with a pH of 10.80 to be made using only sodium carbonate, sodium hydrogen carbonate and water. You should specify the amount of sodium carbonate and sodium hydrogen carbonate that you would use. Below is

    asked on April 4, 2014
  94. Chemistry

    A 7mL triprotic acid was analyzed and found to contain 0.2572 grams of acid, evidence of phosphate group. Find the molecular weight of the acid, and identify acid. Thank you.

    asked on April 3, 2013
  95. Physics

    At a certain instant, a ball is thrown downward with a velocity of 8.0 m/s from a height of 40 m. At the same instant, another ball is thrown upward from ground level directly in line with the first ball with a velocity of 12 m/s. Find (a) the time when

    asked on February 26, 2013
  96. Linear Algebra

    Consider the system x-2y=k-1 4x+(1-k^2)y=8 For what values of k does the system have a. unique solution? b. infinitely many solutions? c. no solution?

    asked on December 18, 2012
  97. Physics

    Which one of the following stresses would be most likely to cause a bone to fracture? A) tensile stress B) compressive stress C) sheer stress D) bulk stress

    asked on November 7, 2012
  98. Trig

    From a point 120 feet from the base of a plant building the angle of elevation to the roof line of the building is 38 degrees. The angle of elevation to the top of an antenna is 43 degrees. The antenna is attached to the nearest edge of the roof and the

    asked on October 24, 2012
  99. math

    consider the equation x^2+kx+1=0 a single fair die(dice)is rolled to determine the value of the middle coefficient, k. the value for k is the number of dots on the upper face of the die. what is the probability that the equation will have real, unequal

    asked on September 19, 2012
  100. Physics

    When a resistor is connected across the terminals of an ac generator (112 V) that has a fixed frequency, there is a current of 0.500 A in the resistor. When an inductor is connected across the terminals of this same generator, there is a current of 0.400 A

    asked on August 3, 2012


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