Popular questions and responses by Joseph
  1. science

    NH2-, NH3, and NH4+ have H-N-H bond angles of 105, 107 and 109. Explain this variation in bond angles.

    asked on August 10, 2010
  2. Mathematics

    Perfume is sold in two different sizes of bottle The 80ml bottle is priced at £55 The 50ml bottle is usually priced at £45, but is on special offer If you buy one 50ml bottle of perfume, you get a second for half price By calculating the price per ml

    asked on November 11, 2017
  3. Physics

    A man using a 70 kg garden roller on a level surface exerts a force 20 kgf at 45 degrees to the ground . Find the vertical force of the roller on the ground if he ; a) pulls the roller. b) pushes the roller.

    asked on January 10, 2011
  4. mathematics

    Also, use tables and not calculators. Finally, do not forget your units. 1. A ladder 20 METRES long rests against a vertical wall. The distance between the foot of the ladder and the wall is 9 METERS a. Find, correct to the nearest degree, the angle that

    asked on July 30, 2020
  5. Physics

    A bullet of mass 50g is fired with a velocity of (500,0)m/s in to a sack of sand of mass 20kg which is swinging from rope. At the moment the bullet hits, the sack has a velocity of (0,3)m/s. Workout the velocity of bullet and sack just after the bullet

    asked on January 12, 2020
  6. Computers

    What is one important feature of an AUP? A. a list of all available courses B. a clear outline of the consequences of violating the policy C. a permissive approach to internet usage D. a calendar for the academic year

    asked on February 20, 2015
  7. Health

    Identify two factors that affect your health that as a teenager you can control.

    asked on January 10, 2019
  8. Math (Combinatorics)

    In how many ways can I place 5 different beads on a bracelet if flipping or rotating the bracelet does not change the order of the beads?

    asked on June 30, 2013
  9. math

    The length of a rectangle is 5cm longer than the its breadth. Find the length and breadth if the perimeter is 26 cm

    asked on April 27, 2020
  10. Geometry

    Please help me!!! 1. Read the following paragraph from "From Behind the Veil." When she reached her room Siham could barely stop herself from laughing out loud. She picked up her veil and danced with glee, then stopped in the middle of the room and began

    asked on February 27, 2020
  11. math

    a ship drops its anchor into the water and creates a circular ripple. the radius of this ripple increases at a rate of 50m/s a) find an equation for the circle 10 seconds after the anchor is dropped i got x^2+y^2=500? is that correct

    asked on June 23, 2019
  12. pre-al

    If you roll a standard number cube 42 times, how many times do you expect the cube to show a six or an eight?

    asked on May 9, 2017
  13. Physics

    A spaceship of mass 2.1×10^6 kg is cruising at a speed of 5.0×10^6 m/s when the antimatter reactor fails, blowing the ship into three pieces. One section, having a mass of 4.8×10^5 kg , is blown straight backward with a speed of 2.3×10^6 m/s . A second

    asked on November 11, 2015
  14. math

    what number gives the same result when multiplied by 6 as it does when 6 is added to it?

    asked on January 25, 2011
  15. Science

    Concentrated phosphoric acid is 90% by mass and the remaining mass is water.The molarity of phosphoric acid in 90% is 12.2M at rtp. a)What is the density of the solution at rtp ? b)What volume (in mL)of this solution is needed to make a 1.00L solution of a

    asked on November 11, 2015
  16. Math

    An arithmetic progression has 11 as its first term and fourth term is 32.find the sum of the first nine terms.

    asked on October 4, 2019
  17. science

    Which statement is not true of simple machines? A.They can change the amount of work done on an object. B.They can change the distance over which you apply a force. C.They can change the direction in which you apply a force. D.They can change the amount of

    asked on August 29, 2018
  18. physics

    the length of an aluminum is 76.5cm and that of an iron ruler is 80cm at 0¡ãc. at what temperature will the length of the rules become equal

    asked on July 20, 2015
  19. organic chemistry

    Provide a structure for the following compound: C9H10O3; IR: 2400–3200, 1700, 1630 cm–1; 1H NMR: δ 1.53 (3H, t, J = 8 Hz); δ 4.32 (2H, q, J = 8 Hz); δ 7.08, δ 8.13 (4H, pair of leaning doublets, J = 10 Hz); δ 10 (1H, broad, disappears with D2O

    asked on February 19, 2015
  20. math

    Trent earned $28,500 last year. He paid $8,265 for rent. What percent of his earnings did Trent pay for rent

    asked on February 26, 2013
  21. physics

    A 5.0 kg block of some unknown material is suspended from a spring scale and submerged in water.? The spring scale reads 39.3 N. What is the specific gravity of the block? I get 5051.5 kg/m^3 but its incorrect.

    asked on June 27, 2012
  22. math

    convert 101101two to a number in base ten.

    asked on March 22, 2012
  23. Physics

    Yo-Yo man releases a yo-yo from rest and allows it to drop, as he keeps the top end of the string stationary. The mass of the yo-yo is 0.056 kg, its moment of inertia is 2.9 X 10^-5 kg X m^2 and the radius r of the axle the string wraps around is 0.0064 m.

    asked on October 23, 2011
  24. math

    the 5 term of a gp is 4375 and the 2 term is 35 find (a)the 3 (b)the 6 (c)the sum of the first five terms

    asked on October 15, 2018
  25. Math

    A transversal intersects two lines. Which conditions would always make the two lines parallel? A) Vertical Angles are Congruent B) Alternate interior angles are congruent C) Corresponding angles are supplementary D) Same-side interior angles are

    asked on October 10, 2018
  26. maths

    solve the equation using cramer's rule. 3x+2y=12 and 2x+3y=7

    asked on May 27, 2018
  27. Algebra

    Write an equation for a function that has a graph with the given characteristics. The shape of y=^3 squareroot x is shifted 7.3 units to the left. This graph is then vertically stretched by a factor of 9. ​Finally, the graph is reflected across the

    asked on December 6, 2016
  28. math

    the volume of a rectangular prism is 2,058 cm3. The length of the prism is three times the width. The height is 14 centimeters. Find the other dimensions

    asked on April 13, 2016
  29. chemistry

    An optically active compound A, C6H10O2, when dissolved in NaOH solution, consumed one equivalent of base. On acidification, compound A was slowly regenerated. Treatment of A with LiAlH4 in ether followed by protonolysis gave an optically inactive compound

    asked on April 10, 2015
  30. Chemistry

    How many resonance structures do these following acids have? H2CO3-carbonic acid H3PO4-phosphoric acid H2SO4-sulfuric acid HNO3-nitric acid CH3COOH- acetic acid CH2ClCOOH- chloroacetic acid CHCl2COOH- dichloroacetic acid CCl3COOH- trichloroacetic acid

    asked on November 4, 2014
  31. Physics

    Steam of mass 11.0 g at 100°C is added to 114.8 g of ice at 0.00°C. Find the final temperature of the system.

    asked on November 14, 2012
  32. chemistry

    Sterling silver, an alloy of silver and copper, contains 7.5 percent copper by mass and has a density of 10.3 g/cm3. How many copper atoms are in a sterling silver sphere whose radius is 2.0 in?

    asked on August 2, 2010
  33. chem

    The normal melting point of copper is 1357 K and heat of fusion of Cu is 13.05 KJ. How much heat, in kilojoules, is evolved when a 3.70 kg sample of of molten Cu freezes?

    asked on February 11, 2010
  34. Math- Truth Tables

    Construct a Truth Table for the given statement: 1. p implies ~(pVq) 2. ~(p AND q)Vp I thought this is how to do it, but my teacher marked it incorrect: 1. p q ~(pVq) p implies ~(pVq) T T F T implies T= T T F F T implies F= F F T F F implies F= T F F T F

    asked on December 15, 2007
  35. Art

    Van Gogh's Starry would you describe his use of lines, colors, shapes and textures I love that piece. How would you describe it? I will be happy to offer critisms and critique of your observations, however, I am not going to do your

    asked on July 15, 2006
  36. Math

    Make the subject of the formula U=1-3v over ut-w

    asked on November 7, 2019
  37. physics

    a stainless steel orthodontic wire is applied to a tooth.the wire has an upstretched length of 3.1cm and a radius of 0.11mm.if the wire is stretched 0.10mm,find the magnitude and direction of the force on the tooth.disregard the width of the tooth assume

    asked on November 19, 2018
  38. math

    if 1/2,1/x,1/3 are successive terms of an arithmetic progression. Show that 2-x /x-3 = 2/3.

    asked on December 27, 2017
  39. language

    Barbra Jordan believes that we must put our faith in children because?

    asked on November 23, 2017
  40. Math

    Five years ago, a father was 3 times as old as his son. Now, their combined ages amount to 110 years. Thus, the present age of the father is?

    asked on September 4, 2017
  41. Math

    Exponetial Functions In the following exponential relations, solve for x using logarithms. Round your answers to 4 decimal places. a) 5^3x=65 b) 2^2x+3=80

    asked on December 31, 2015
  42. Chem.

    Ethanol has a heat of vaporization of 38.56 KJ/Mol. And a normal boiling point of 78.4 degrees celcius. WHAT is the vapor pressure of ethanol at 18 degrees celcius?? Okay...I don't really get out to solve for it actually. ln (P2/760 torr)= -38560/8.3145 *

    asked on February 10, 2010
  43. Chem.

    Ethanol has a heat of vaporization of 38.56 KJ/Mol. And a normal boiling point of 78.4 degrees celcius. WHAT is the vapor pressure of ethanol at 18 degrees celcius??

    asked on February 10, 2010
  44. Physics

    A 40-kg block is dragged along a horizonatl surface by an applied force as shown. The coefficient of kinetic friction is µk = 0.4 and the block moves at constant velocity. What is the magnitude of F ?

    asked on March 28, 2020
  45. Chemistry

    The initial concentration of NH3 in the zero order reaction NH3→3H2+N2 is 0.0312 M. After 30.0 seconds, the concentration of NH3 is 0.0302 M. What is the rate constant k for the reaction?

    asked on February 21, 2019
  46. english

    what is the meaning of the Root bell

    asked on March 14, 2016
  47. stats

    The controller for a garage door opener has nine binary switches that can be set to either on or off. How many different total settings can be set on this controller?

    asked on October 26, 2015
  48. chemistry

    Distinguish clearly between ▲G for a reaction and ▲S of the same reaction. Which of the two is used to predict whether a reaction is spontaneous? why? (4 marks)

    asked on March 21, 2015
  49. Inorganic Chemistry

    Which of the following species contain an inversion center? Choose all that apply. SeF6 [IF4]- SnF4 InH3

    asked on March 5, 2015
  50. Inorganic Chemistry

    Which of the following species contain a C4 axis and a σh plane? Choose all that apply. [ICl4]- SiCl4 XeF4 GeH4 [PO4]3

    asked on March 5, 2015
  51. physics

    A uniform horizontal bar of length L = 5 m and weight 243 N is pinned to a vertical wall and supported by a thin wire that makes an angle of theta = 39o with the horizontal. A mass M, with a weight of 300 N, can be moved anywhere along the bar. The wire

    asked on June 27, 2012
  52. spanish/another question

    Choose the best word Sernoritas, ustedes (vino, vinieron) answer vinieron is it right?

    asked on April 26, 2012
  53. Science

    The cirucumference of a ballon is 75 inches and the diameter is 12 inches what is the volume? Science - Ms. Sue, Saturday, February 18, 2012 at 9:54pm Thank you. volume = 4/3 ð r3 V = (4/3) * 3.14 * 6^3 V = (4/3) * 3.14 * 216 V = (4/3) * 678.24 V = ? I am

    asked on February 19, 2012
  54. Calculus

    Find the point on the line 2x+7y-6=0 which is closest to the point (-5,5.

    asked on November 13, 2011
  55. physics

    A child pedals a tricycle, giving the driving wheel an angular speed of 0.373 rev/s. If the radius of the wheel is 0.260 , what is the child's linear speed?

    asked on October 23, 2011
  56. Math

    The length of a rectangle is twice its width if the area of the rectangle is 200 m squared, find its perimeter.

    asked on January 17, 2011
  57. Statistics

    A student studies for a statistics exam where all questions are true or false. A reputable source indicates that with studying the student has a 90% chance of answering each question correctly. There are only three questions on the test. What is the

    asked on November 28, 2010
  58. Physics help please

    The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.030 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.055 kg and is initially at rest. The

    asked on November 7, 2010
  59. Physics please help cant figure this out

    starting with an initial speed of 5.00 m/s at a height of 0.265 m, a 1.75 kg ball swings downward and strikes a 4.45 kg ball that is at rest, as the drawing shows. (a) Using the principle of conservation of mechanical energy, find the speed of the 1.75 kg

    asked on November 5, 2010
  60. Science

    which of the following are predicted by the molecular orbital model to be stable diatomic species N22-, O22-, F22-

    asked on October 23, 2010
  61. chemistry

    write the net ionic equation for the following : 2CuCl(aq)-> CuCl2(aq)+ Cu(s) 4NaCl(aq)+2H2SO4(aq)+MnO2(s)-> 2Na2SO4(aq)+2H2O(l)+Cl2(g) 3KOH(aq)+Fe(NO3)3(aq)->Fe(OH)3(s)+ 3KNO3(aq)

    asked on September 6, 2010
  62. Chemistry

    A gaseous mixture of O2, H2, and N2 has a total pressure of 1.50 atm and contains 8.20 g of each gas. Find the partial pressure of each gas in the mixture They don't give you Volume and Temperature. Please explain it to me, thank you!

    asked on August 2, 2010
  63. chemistry

    For the reactions that occurred spontaneously in the individual tables, balance these reactions assuming they are in an acidic solution. Reaction 1: Cu I^- Ag Br^- Reaction 2: Zn Pb Cu Ag Reaction 3: Cl2 Br2 I2 Reaction 1 I 2(aq) Cu2 + (aq) Ag + (aq) Br2

    asked on April 15, 2008
  64. chemistry

    Reaction 1: I2(aq)Cu^+2(aq) Ag^+(aq)Br2(aq) Column 1---Column 2---Column 3---Column 4---Column 5 I-(aq)---X---X---T---T Cu(s)---T---X---T---T Ag(s)---X---X---X---T Br-(aq)---X---X---X---X Reaction of metals and solution of ions Reaction 2:

    asked on April 14, 2008
  65. legal and ethical environment of business

    For the past ten years, DWI has wanted to develop the lucrative Iraqi oil reserves for its exploration, drilling, refining, and transport division; DWI's Oil Division has been limited to Siberia and the South China Sea up to this date, and was precluded

    asked on May 23, 2007
  66. physics

    A ball thrown with a speed of 100m/s attains a height of 150m calculate the angle of projection

    asked on November 20, 2019
  67. algebra

    how do you simplify |4x + 8 - 10| ≥ 6 ? because i got x ≤ 2 and x ≥ -6 as the answer. But, someone else got x ≤ 2 and x ≥ -1.. (because they simplified by subtracting 8 to 10) (it is absolute value) so, i thought that you would add 10 to 6 to

    asked on November 5, 2019
  68. Algebra 1

    A 10 meter rope is cut into two pieces so that one piece is equal to 5 meters longer than 4 times the shorter piece find the lengths to both sides

    asked on September 24, 2019
  69. physics

    A golfer hits a ball from the origin with an initial speed of 30.0 m/s at an angle of 50 degrees above the horizontal. The ball lands on a green that is 5.00 m above the level where the ball was struck. (a) How long was the ball in the air? (b) How far has

    asked on October 26, 2018
  70. Functions

    Milk is leaking from a carton at a rate of 3mL/min. There is 1.2 L of milk in the carton at 11:00 a.m. How much will be left in the carton at 1:00 p.m.? f(x)=1200-3x

    asked on September 10, 2018
  71. Physics

    A wet bar of soap slides freely down a ramp 17.0 m long, inclined at 38.0 degrees. How long (in seconds) does it take to reach the bottom? (Neglect friction.)

    asked on February 21, 2017
  72. math algebra

    Sum the following term of progression to the last term, logx, logx^2 logx^3.... logx^120

    asked on February 12, 2017
  73. Physics

    A 15 ft plank of mass 50 kg is laid across two ladders. The ladders are 5 ft apart, and the plank is laid such that 5 ft of it hang off at each end. You have a mass of 90 kg. (a) How far out past the ladder can you walk before it gets dangerous? I tried

    asked on December 11, 2016
  74. Math

    Convert to an exponential equation. log Subscript w Q=13 Thanks

    asked on December 6, 2016
  75. math

    a girl walks 800 m on a bearing of 129 degrees.calculate how far east and south she is from her starting point.

    asked on May 16, 2016
  76. Physics

    An object 20cm high is placed 40cm from a lens of focal length 24cm. Calculate: a) The power of the Lens? b) The distance from the lens to the position of the image?

    asked on March 7, 2016
  77. Math

    11 + 2z= 14.78 Find the variable

    asked on January 27, 2016
  78. Math

    14 + y/8 = 10 What is the variable?

    asked on January 27, 2016
  79. Math

    13+d=44 What does the variable represent

    asked on January 27, 2016
  80. Math

    5/6 (2g+1)-g Simplify the expression

    asked on January 27, 2016
  81. Math

    Two even integers are represented by 2n and 2n+2. Explain how you can find the value of those integers if their sum is 14. Name the integers.

    asked on January 27, 2016
  82. MATH

    You are asked to calculate the weight that a hotel elevator can safely carry. You should expect your answer to be

    asked on January 14, 2016
  83. Math

    If the value of a car decreased by 10 percent and is now worth $ 21,000. What was the original cost of the car?

    asked on October 27, 2015
  84. Math

    If a car decreased by 10 percent and is now worth $14,000. What was the original price of the car

    asked on October 27, 2015
  85. Physics

    Michael Jordan has the record for the highest vertical jump at 48 inches (1.22m). While on the ground, he speeds up over a distance of 0.6 m to achieve the necessary launch speed. What acceleration does his legs provide in order to achieve his height?

    asked on October 19, 2015
  86. Mathes


    asked on August 18, 2015
  87. Regent University

    A point charge of 0.5 is brought to a point a in free space. How much work is required to do this?

    asked on August 2, 2015
  88. Chemistry

    How energy is needed to vaporize 100 g of ethanol from its boiling point?

    asked on June 24, 2015
  89. math

    A coin is tossed 3 times. Find the probability that all the 3 are heads (A) if it is known that the first is heads (B) if it is known that the first 2 are heads (C) if it is known that the 2 of them are heads

    asked on February 7, 2015
  90. statistics

    A coin is tossed 3 times. Find the probability that all the 3 are heads (A) if it is known that the first is heads (B) if it is known that the first 2 are heads (C) if it is known that the 2 of them are heads

    asked on February 7, 2015
  91. mathematic

    a bag contains 3rdmarbles, 2white and 3green a boy takes at one marble at random. what is the prob that it is either red or white?

    asked on February 2, 2015
  92. physic

    In a serious accident, a nuclear power plant's reactor vessel cracks, and all of the cooling water drains out. Although nuclear fission stops, radioactive decay continues to heat

    asked on May 6, 2014
  93. physics

    A metal ball of mass 1.8 kg with initial temperature of 46.5 C is dropped into a container of 3 kg of water at 15 C. If the final temperature is 22.6 C, what is the specific heat of the metal? c_metal =____ J*kg*C?

    asked on May 4, 2014
  94. anatomy physiology/check please

    Muscular dysgenesis or dysgeny is a lethal, recessive, genetic disease of mice that is caused by a mutation in the mdg gene. Skeletal muscles from dysgenic mice are paralyzed and the animals die shortly after birth. You are a research scientist interested

    asked on April 4, 2013
  95. science

    A 10.0 kg cart and a 15 kg cart are locked together with a compressed spring between them. They are then released so that the spring pushes the two carts apart. The 15 kg cart is moving at 3.0 m/s afterward. How fast is the 10.0 kg cart moving?

    asked on February 16, 2013
  96. math

    jewelry marked 14 karat gold is 14/24 pure gold. what is the percent

    asked on February 11, 2013
  97. Physics

    A 2.2m of steel wire hangs vertically down from a support. A 1.5m length of brass wire of the same diameter is attached to the lower end of the steel wire.when a 10 kg mass is attached to the lower end of the brass wire a total extension of 0.05 m is

    asked on January 10, 2013
  98. chemistry

    What volume of oxygen at s.t.p is required for the complete combustion of methane according to the following equation. CH4 2O2= CO2 2H2O

    asked on January 10, 2013
  99. Physics

    A toy train is moving on a track from right to left. You are told that work is the dot product of force and displacement. In what direction would you apply a force so that you do the most negative work on the train? a)You would apply a force that is in the

    asked on September 10, 2012
  100. Physics

    Which of the following statements related to vectors is not correct? a) A "one way" road sign is an example of a vector. b)A vector is a physical description that includes both a number and a direction. c)If someone states, "Joe is traveling at 30 miles

    asked on September 9, 2012


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