Popular questions and responses by joseph
  1. 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
  2. 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
  3. 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
  4. 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
  5. Chemistry

    The vapor pressure of liquid bromine at room temp is 168 torr. If the bromine is introduced drop by drop into a closed system containing air at 775 torr, what would the total pressure (in torr) be when no more bromine vaporized and a few drops of liquid

    asked on July 14, 2019
  6. 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
  7. Mathematics

    Given that, the coefficient of x^4 is 3840 in the binomial expansion of (1+qx)^6. Find: i. The value of q. ii show that the of sum of kx^3 and px^4 is 5120.

    asked on June 22, 2020
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. Chem.

    Benzene has a heat of vaporization of 30.72 kj/mol and a normal boiling point of 80.1 degrees celcius. At what temperature does Benzene boil when the external pressure is 440 torr? Since...I didn't get the right answer. I'll just show my work and see if

    asked on February 10, 2010
  15. 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
  16. 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
  17. 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
  18. Math

    Which equation represents a line that is parallel to the line whose equation is 3x - 2y = 7 A) Y= -3/2x + 5 B)Y= -2/3x + 4 C)Y= 3/2x - 5 D)Y= 2/3x - 4 I chose c

    asked on October 10, 2018
  19. Physics

    A toy rocket has a mass 0f 350g at launch. The force it produces is 15N and it is fired at an angle of 65° to the horizontal. What is the initial acceleration of rocket as a vector?

    asked on January 13, 2020
  20. Physics

    The constant resistance of a resistor is 30 ohms, independent of the temperature. The resistor is made up of an aluminium resistor with resistance R1 at 0°C in series with a carbon resistor with resistance R2 at 0°C. Evaluate R1 and R2, temperature

    asked on October 8, 2017
  21. 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
  22. 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
  23. chemistry

    Express your answer as a chemical equation. Identify all of the phases in your answer. H3PO + Sr(OH)2=

    asked on March 10, 2011
  24. 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 12, 2010
  25. 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
  26. 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
  27. math

    James has to choose his options in his final year at school. He must choose one subject from each of five different option groups. In the first group, there are six subjects to choose from. In the second group, there are four subjects to choose from. In

    asked on May 15, 2020
  28. 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
  29. 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
  30. 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
  31. Physics

    2 forces acting at a point make angles of 25 and 65 degrees respectively with their resultant which has a magnitude of 150 N .Find the magnitude of the two components.

    asked on December 31, 2010
  32. 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
  33. 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
  34. english/poem

    I am suppose to do a funny sonnet poem that has 10 syllables per line and 14 lines .Can you check my syllable or any mistakes. Oh homework! Oh homework! How I hate you! You smell, you stink, and you I don’t admire I want to tell you “go on” “git”

    asked on April 21, 2012
  35. Math

    An equalateral triangle has the length of it's sides given as (y+3)cm, (2y-x)cm and (4x +3)cm.Find (a) the value of x and y (b)perimeter of the triangle (c) altitude of the triangle to the nearest whole number

    asked on October 26, 2011
  36. chemistry

    The first-order reaction, SO2Cl2 ¨ SO2 + Cl2, has a rate constant equal to 2.20 ~ 10-5 s-1 at 593 K. What percentage of the initial amount of SO2Cl2 will remain after 6.00 hours?

    asked on September 27, 2010
  37. 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
  38. social studies

    The secularism of the Renaissance was a shift from what feature of medieval life?

    asked on May 21, 2019
  39. 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
  40. 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

    Select the complete subordinate clause (including all modifiers). I honestly did not know that you felt so strongly about the subject. A.I honestly b.I honestly did not know c.did not know that you d.that you felt e.that you felt so strongly f.that you

    asked on January 14, 2014


    asked on March 20, 2013
  43. 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
  44. algebra

    ax/b + cx/d =e solve for variable x

    asked on February 7, 2011
  45. 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
  46. reding

    milkweed jerry spinelli what do you think the black horse on the merry-go-round might have symbolized?

    asked on March 26, 2009
  47. 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
  48. 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
  49. 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
  50. 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
  51. language

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

    asked on November 23, 2017
  52. 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
  53. Mathematics

    A rectangle has been divided into two strips, A and B. The strips have the same width. 2/5 of strip A is shaded. 5/8 of strip B is shaded. The length of the rectangle is 40cm. What fraction of the rectangle is not shaded? Thank you. Joseph.

    asked on March 24, 2017
  54. 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
  55. chemistry

    How much heat (in cal) is necessary to heat 27.0 mL of octane (s= 0.526 cal/g ®C ; d = o.703 g/mL ) from 50.6 ®C to 67.2 ®C? I understand the Delta T is = 16.6®C But I don’t know what d stands for (density) or how to apply to the formula.

    asked on February 3, 2013
  56. 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
  57. math

    convert 101101two to a number in base ten.

    asked on March 22, 2012
  58. physics

    A reciprocating compressor is a device that compresses air by a back-and-forth straight-line motion, like a piston in a cylinder. Consider a reciprocating compressor running at 150 rpm. During a compression stroke, 1.30 mol of air is compressed. The

    asked on May 30, 2011
  59. 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
  60. 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
  61. History

    What was Joseph Stalin's full name?

    asked on May 31, 2020
  62. Algebra

    I need help with this question: x^2-20x+24

    asked on May 19, 2020
  63. English

    In a compare and contrast essay, which of the following transitions would show a comparison of ideas

    asked on April 13, 2020
  64. physics

    the efficiency of a machine is 80% determine the work done by a person using this machine to raise a load of 200kg through a vertical distance of 3.0m {take g=10m/s}

    asked on October 7, 2019
  65. Physics

    A spring 20cm long is stretched to 25cm by a load 5N. What will be it's length when stretched by 100N assuming that the elastic limit is not reached?

    asked on April 26, 2019
  66. math

    John who is 15 years old, is 3 years older than his younger brother Paul. If James their brother is 21years old. What is the average of the three brothers

    asked on April 4, 2019
  67. 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
  68. Physics

    A progressive wave equation is given by y=a sin (200(pie)t -(pie)x/17) Find; 1) The wavelength 2) Velocity 3) Frequency 4) Period

    asked on December 21, 2018
  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. 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
  71. Chemistry

    At 25oC, the equilibrium pressure of ammonia vapour above a 0.500 M aqueous ammonia solution is 0.84 kPa. Calculate the Henry's law constant for ammonia in M/bar. Do not include units. Include 4 significant figures.

    asked on February 8, 2018
  72. 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
  73. physics

    a motorbike weighs 400kg accelerates uniformly at 1.5m/s2 from rest to 22m/s. then the brakes are applied and it stops 2.5s later. (a)Sketch a graph showing the motion history (b)From the sketch,determine the total distance traveled (c)Determine the

    asked on September 6, 2017
  74. physics

    The ice skate of a 210-pound hockey player is in contact with the ice over a 2.5mm x 15cm area. Determine the freezing point of the ice under the blade of the skate?

    asked on October 30, 2016
  75. Math

    Use a tree diagram or systematic list to determine the number of ways a nickel, a dime, and a quarter can be flipped to get exactly one tail.

    asked on September 4, 2016
  76. Math

    A class of 23 students was using square tiles to build rectangular shapes. Each student had more than 1 tile and each had a different number of tiles. Each student was able to build only one shape of rectangle. All tiles had to be used to build a rectangle

    asked on June 20, 2016
  77. math

    find the hidden question. single load cost $2 and double load cost $4

    asked on February 10, 2016
  78. chemistry (moles)

    2.5g of a mixture of anhydrous BaOH and BaCl2 was dissolved in distilled water and made up to 250cm3. 20cm3 of this solution required 19cm3 of 0.1moldm3 of dilute nitric acid for complete reaction. Calculate the percentage by mass of BaCl2 present in the

    asked on January 21, 2016
  79. 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
  80. Math

    If the temperature was -10F and dropped by 16F what would the temperature be?

    asked on December 16, 2015
  81. Physics

    At the start of a road trip, the pressure of the air in a car tyre is 276kPa and the temperature is 12.0 degrees celsius. After driving for some time the pressure in the tyre is now 303kPa. Assuming that the volume of the air inside the tire remains

    asked on December 5, 2015
  82. 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
  83. Physics

    A projectile of mass 0.413 kg is shot from a cannon, at height 6.8 m, with an initial velocity vi having a horizontal component of 7.5m/s. The projectile rises to a maximum height of ∆y above the end of the cannon’s barrel and strikes the ground a

    asked on September 16, 2015
  84. 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
  85. math

    Juanita wants to give bags of stickers to her friends. she wants to give the same number of stickers to each friend. she's not sure if she needs 4 bags or 6 bags of stickers. How many stickers could she buy so there are no stickers left over.

    asked on February 23, 2015
  86. 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 20, 2015
  87. 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
  88. Trig

    A 24-foot ladder is placed against a building. The building is perpendicular to the level ground so that the base of the ladder is 11 feet away from the base of the building. How far up the building, in feet, does the ladder reach? Round to nearest

    asked on May 19, 2014
  89. Math

    Which relation is NOT a function? Y=0 X=2 Y=2x Y=x+2

    asked on February 6, 2014
  90. Pre-Calculus

    Write an algebraic expression in x for sec(arcsin(x/sqrt(x^(2) +4)))

    asked on January 8, 2014
  91. social studies

    Which iroquois nations lived the farthest from new york city?

    asked on October 9, 2013
  92. Physics

    A car is traveling at 24.4 m/s. If the driver has a reaction time of 1 second, what will be his stopping distance if his car slows down at 8 m/s2?

    asked on September 19, 2013
  93. 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
  94. 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
  95. math

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

    asked on February 11, 2013
  96. 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
  97. english

    Write S if the sentence is simple .Write C if the sentence compound. 1) Paul plays on the basketball team and works part time at the grocery store. Compound 2)He is an assistant manager in the deli.Simple 3) The store manager hired him as a bagger,but Paul

    asked on April 23, 2012
  98. Math 117

    Use rational exponent to write 4 cube root x multiply by 6 cube root 6x as a single radical expresion.

    asked on February 12, 2012
  99. Calculus

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

    asked on November 13, 2011
  100. geometry

    line AB is parallel to line CD, the measurement of angle A=2x-25, and the measurement of angle C=x+5. find the value of x. show work and explain your reasoning.

    asked on October 29, 2011


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