Most popular questions and responses by francis
  1. Physics

    You cool a 100g slug of red hot iron (745oC) by dropping it into an insulated cup of negligible mass containing 75.0g of water, at 20oC. Assuming no heat exchange with the surroundings (a) what is the final temperature of the iron? (b) what is the final

    asked on April 24, 2017
  2. Physics

    1. A cylindrical disk of wood weighing 45.0N and having a diameter of 30.0 cm floats on a cylinder of oil of density 0.850 g/cm3. The cylinder of oil is 75.0 cm deep and has the same diameter of the wood. (a) What is the gauge pressure at the top of the

    asked on April 24, 2017
  3. physics(waves)

    A wave has a speed of 340m/s and a period of 0.28ms. what's the wavelength? so I worked this and I got 95.2m but the answer to d question says 0.095m. period(T) = 1/F (since F = 1/T) therefore, F = 1/0.28 = 3.5714 wavelength = velocity/frequency w =

    asked on February 23, 2015
  4. Science

    A uniform have metre rule,pivoted at 20cm mark balances horizontally when a mass of 50g is suspended from 4cm mark calculate the mass of the metre rule.

    asked on March 3, 2017
  5. chemistry

    what is the percentage yield of c2h2 with 50g of cac2 reacts with water to yield 13.5g of c2h2

    asked on February 17, 2016

    At noon, Al is 6km north of point O traveling south at 10km/h. Also at noon, Barb is 2km east of point ) traveling east at 5km/h. A) express the distance "d" between Al and Barb as a function of time "t" hours after noon. B) Find the time at which the

    asked on October 29, 2013
  7. Science

    C6H5NH2 + H2O C6H5NH3+ + OH- 1. Aniline, a weak base, reacts with water according to the rxn above. a. A sample of aniline is dissolved in water to produce 25.0 ml of a .10 M soln. The pH of soln is 8.82. What is Kb for this rxn? b. The soln in part b,

    asked on April 12, 2008
  8. Physics

    A cube of ice is taken from the freezer at -9.0°C and placed in a 71-g aluminum calorimeter filled with 261g of water at room temperature of 20.0°C. The final situation is observed to be all water at 13.4°C. What was the mass of the ice cube (in grams)?

    asked on April 4, 2017
  9. physics

    A toboggan slides down a hill and has a constant velocity. The angle of the hill is 6.50° with respect to the horizontal. What is the coefficient of kinetic friction between the surface of the hill and the toboggan?

    asked on June 30, 2013
  10. Chemistry

    A sample of iron weighing 15.0 g was heated with potassium chlorate (KClO3) in an evacuated container. The oxygen generated from the decomposition of KClO3 converted some of the Fe to Fe2O3. If the combined mass of Fe and Fe2O3 was 17.9g,calculate the mass

    asked on August 22, 2013
  11. science

    A tower is 24 m high. A stone is projected upwards from the tower, at a velocitry of 24,5 m/s. Calculate how long it would take the stone to reach the ground at the roof of the tower.

    asked on November 1, 2015
  12. physics

    A pupil pushes a wheelbarrow carrying 30kg sand it accelerates from rest to 2m/s in the distance of 1m. If the friction is on the wheelbarrow is 0.5n find accelaration

    asked on January 22, 2019
  13. mechanics and fluids

    a block of mass 6 kg resting on a horizontal surface is connected by a cord passing over a light, frictionless pulley to a hanging block of mass 4 kg. the coefficient of kinetic friction between the block and the horizontal surface is 0.5. after the block

    asked on September 8, 2014
  14. maths(direction cosines of vectors)

    find the direction cosines of the vector joining the two points (4,2,2,) & (7,6,14) (this is new to me, used to think it was just one point not two.)

    asked on March 9, 2015
  15. Maths

    find the equation of the perpendicular bisector of the line joining P(2, -4) to Q(-5,1) A. 8y-14x 13=0 B. 8y-14x-13=0 C. 8y 14x-13=0 D. 8y 14x 13=0 Please I need someone to help me with this, with an explanatory workings.

    asked on May 21, 2014
  16. Business

    Assume venture Healthcare sold bonds that have a ten year maturity,a 12 percent coupon rate with annual payment,and a $1000 par value.Suppose that two years after the bonds were issued ,the required interest rate fell to 7 percent .what would be the bond

    asked on December 7, 2015
  17. physics

    Calculate the energy required to vapourise 50g of water Initially at 80¡ãC if the specific heat capacity of water is 4.2 J/g.k. (specific latent heat of vapourisation of water is 2260 J/g)

    asked on July 31, 2014
  18. Math Analysis (Pre Calc)

    A pilot wants to fly 430 miles per hour at 45 degrees north of east, but there is a westerly wind blowing 20 miles per hour. What course correction does the pilot have to make to fly on his desired landing? I wasn't able to figure out any work for this

    asked on February 11, 2016
  19. physics

    what is the minimum effort required to raise a load of 5kg in an ideal pulley system taking gravity to be 10m/s/s

    asked on October 21, 2016
  20. math

    97 is the largest prime less than 100. What is the largest prime factor of 97! (97 factorial)? (Reminder: The number n! is the product of the integers from 1 to n. For example, 5!=5*4*3*2*1= 120.)

    asked on April 19, 2016
  21. MATH

    Nicole makes a keychain by using yellow, red and green beads. The number of red beads used is more than twice the number of yellow beads by 10, while the number of green beads used is more than one-third the number of yellow beads by 7. It is known that

    asked on November 7, 2015
  22. Maths

    ABC is an isosceles triangle |BC|=10CM, A=55 degrees calculate AC

    asked on May 23, 2019
  23. physics

    A stone tied to a strong is made tn resolue in a horizontal circle of radius 4m with angular speed of 2 radian,persecond with what tingential velocity will the stone move off the circle if the string cuts

    asked on October 18, 2011
  24. Social Studies

    What was Jefferson's laissez-faire policy? Can you Give an example of it.

    asked on November 30, 2009
  25. maths

    Solve 1.-6b+1+4b= -3b+6 2.8x - 4x = -8 3.the sum of twice a number and 14 less than the number is the same as the difference between -38 and the number. what is the number? 4. some number is six more than eight. what is the number? 5. 3.2x + 5.6x = 3.1 +

    asked on October 11, 2006
  26. physics

    A solid of mass 1kg suspended by a string is completely immersed in water. If the tension in the string is 5N, calculate the upthrust on the solid. (take g = 9.78m/s)

    asked on July 31, 2014
  27. physics

    An observer on Earth sees an alien vessel approach at a speed of 0.44c. The Enterprise comes to the rescue, overtaking the aliens while moving directly toward Earth at a speed of 0.89c relative to Earth. What is the speed of one vessel as seen by the

    asked on June 10, 2017

    An entertainer juggles balls while doing other activities. In one act, she throws a ball vertically upward, and while it is in the air, she runs to and from a table 5.50m away at a constant speed of 2.50m/s, returning just in time to catch the falling

    asked on July 13, 2010
  29. Physics!

    At a steam power plant, steam engines work in pairs, the output of heat from one being the approximate heat input of the second. The operating temperatures of the first are 520°C and 320°C, and of the second 310°C and 170°C. If the heat of combustion

    asked on May 23, 2017
  30. Physics

    Standard Temperature and Pressure (STP) is defined as a temperature of 0.00oC and a pressure of 100kPa. If the molar mass M of nitrogen is 14.0 g/mol, find the density (kg/m3) of nitrogen gas (N2) at STP. Nitrous Oxide or laughing gas is composed of the

    asked on April 24, 2017
  31. trig

    If x and y are complementary angles and 5 tan x-12=0,calculate by using a diagram the value of 2sin(squared)x+cos y.

    asked on May 3, 2012
  32. competitiveness,strategy,and productivity-operatio

    As a consumer,what things do you consider in judging the quality of cookies you buy in a supermarket

    asked on February 22, 2011
  33. math

    tilissa was on the middle rung of a ladder.she went up 3 rungs,thendown 5 rungs and then up 7 rungs where she rested.later she climbed up the remaining 7 rungs on the many rungs did the ladder have?

    asked on January 27, 2013
  34. gallegos

    "Robert can swim the first 50 meters of a race in 1 minute. Then he slows down by 12 seconds for each of the next 50 meters of a race. How long will it take Robert to swim a 400-meter race?

    asked on November 26, 2012
  35. Math

    M varies directly as the square of N. If N increases by 10%, find the percentage change in M

    asked on May 6, 2018
  36. Physics

    Boxes are moved on a conveyor belt from where they are filled to the packing station 11.3m away. The belt is initially stationary and must finish with zero speed. The most rapid transit is accomplished if the belt accelerates for half the distance, then

    asked on December 30, 2016
  37. math

    What is the greatest prime factor of 3105?

    asked on April 19, 2016
  38. applied chemistry

    Draw electron dot diagram for the following compound HCL,CO2,NH3,NH4CL,CH4 And H2O2

    asked on December 8, 2015
  39. math

    4.In Amy’s English class, 30% of the students play an instrument. She does not know how many in the whole school play an instrument, but there are 500 students in the school. A.Solve the proportion 30/100=n/500 to estimate the total number of students in

    asked on April 15, 2015
  40. Physics

    Calculate the specific heat capacity of substance x from the following data. A container made of the substance x has a mass of 3.6kg and contains 14kg of water. A 1.8kg-piece of the substance x initially at the temperature of 180°C is dropped into the

    asked on November 20, 2017
  41. Physics

    A horizontal pipe is shown and has an area of 40.0 cm2 in wide areas and 10.0 cm2 in narrow areas. It is also connected to a U shaped tube filled with mercury. water is flowing through the pipe at a rate of 5.00 L/s. Find (a) the flow speeds at the wide

    asked on April 24, 2017
  42. Maths

    The line x 7y=5 cuts the circle x^2 y^2=15 at the points P & Q. Find: a) P & Q. b) the midpoint of PQ.

    asked on March 2, 2015
  43. Maths (factor theorem)

    9x^2 6xy 4y^2 is a factor of 27x^3 - 8y^3, find the other factor.

    asked on July 18, 2014
  44. maths/permutation and combination

    Find the number of ways, the digits 0,1,2 and 3 can be permuted to give rise to a number greater than 2000. Please I need an explanatory workings!!!

    asked on May 21, 2014
  45. information literacy

    4. Which of the following statements about human-power search engines is true? A. People code the search engine so that they'll populate lists of trending search terms and phrases. B. Links are selected by users. C. Users send in their search request and

    asked on August 27, 2015
  46. spanish

    1). What is a "cognate"? 2). Why is learning cognates the most efficient and rapid way to learn to read, speak, increase vocabularly and get high marks on tests in a foreign language? Bonus question: What is the relationship between "cognates" and

    asked on June 23, 2012
  47. college

    importance of pharmacy delivery time of a 50mm burette calibration of a burette importance of uniformity of weight og tablets

    asked on September 11, 2008
  48. science

    Youre travelling down the road in a car with a total mass(including passengers) of 2.24 X 10^3 a)What is the change in kinetic energy of the car if you slow down from 80km/h to 70km/h(reducing your speed by 10km/h) B)what is the change in kinetic energy of

    asked on January 21, 2017
  49. Math

    Mia took a test with 60 multiple-choice questions. Her teacher told her she got 88% correct. A.Write and solve a proportion to figure out how many questions she got correct.

    asked on April 16, 2015
  50. Calculus

    differentiate tan-1(2x/1-x^2)

    asked on January 27, 2015
  51. gallegos

    "Robert can swim the first 50 meters of a race in 1 minute. Then he slows down by 12 seconds for each of the next 50 meters of a race. How long will it take Robert to swim a 400-meter race?

    asked on November 26, 2012
  52. Math

    What are the following numbers rounded to the nearest thousandth: 0.00673, 63.4982, 4.8919, 5.9198.

    asked on April 26, 2011
  53. Physics

    A glass flask with a mass ok 3.00kg and volume of 1000 cm3 is completely filled with mercury and is at a temperature of 55.0oC. The flask is then lowered into an ice water bath. After thermal equilibrium is reached, (a) what percentage of the flask will be

    asked on April 24, 2017
  54. Math

    3.Josh has a huge marble collection. He counts 280 marbles that are red, and he estimates that this is about 10% of his collection. A.Write and solve a proportion to estimate the total number of marbles Josh has.

    asked on April 16, 2015
  55. math

    The line x plus 7y=5 cuts the circle x^2 plus y^2=15 at the points P & Q. Find: a) P & Q. b) the midpoint of PQ. (I don't know why, but the plus sign does not show after I submit d question so dats y I wrote it in words)

    asked on March 2, 2015
  56. Calculus

    If Y = SecXTanX, find y" 4y' 4y. I can easily do the second part of the question if I could if only I could find d first and second derivative of SecXTanX, pls do help.

    asked on February 9, 2015
  57. College Algebra

    How to solve this system? x + [(3x-y)/(x^2+y^2)] = 3 y - [(x+3y)/(x^2+y^2)] = 0

    asked on October 11, 2014
  58. Maths (differentiation)

    Differentiate Y = 1/SinX^2

    asked on July 28, 2014
  59. English HL

    An essay about("Be quiet,"the leader hissed."they, mustn't know we are here".

    asked on January 27, 2013
  60. Physics

    A slingshot with k = 400. N/m is pulled back 0.0500 m to shoot a 0.100-kg stone. If the slingshot projects the stone straight up in the air, (a) what is the speed when the stone is first released, and (b) what is the maximum height to which the stone will

    asked on December 27, 2012
  61. Chemistry

    A sample of a curium isotope was roasted. It was determined that the product( curium oxide) contained 11,59% of oxygen.¿ What is the equivalent weight of the isotope in the oxide? ¿ What is the mass of the curium isotope? I have already gotten the answer

    asked on June 18, 2017
  62. Physics

    A bar of gold and a bar of silver are used to conduct heat from one end maintained at 80.0oC and another end maintained at 30.0oC. If both bars have the same length L = 1.00m and the same cross sectional area A=100cm2 and are insulated from the outside,

    asked on April 24, 2017
  63. Civic education

    Fundamental human right are said to be inalienable, discuss the limitations of human right

    asked on January 13, 2017
  64. Math

    I am a number. Go round the corners of the given figure 4 times. When you add my value with the number of corners you have crossed you get 46. Find my value.

    asked on February 17, 2016
  65. social studies

    how did the wright brothers change the world a short esssay

    asked on October 7, 2015
  66. Calculus

    The volume of a solid

    asked on February 6, 2015
  67. calculus

    lim x->0 (Sin^3 3x - 3x^3)/(x^3) (x^4)

    asked on January 29, 2015
  68. Maths

    if p:q=2/3:1/6 & q:r=3/4:1/2. find p:q:r

    asked on July 18, 2014
  69. science

    you are asked to make a 0.3M Calcium chloride solution in a flask that can hold 200ml.How would you do it.

    asked on February 16, 2013
  70. Physics

    A slingshot with k = 400. N/m is pulled back 0.0500 m to shoot a 0.100-kg stone. If the slingshot projects the stone straight up in the air, (a) what is the speed when the stone is first released, and (b) what is the maximum height to which the stone will

    asked on December 27, 2012
  71. math

    I work 1 and 1/4 hour per day how many hours do I work per week and for five weeks

    asked on November 26, 2012
  72. Geography - Italy

    My teacher gave us a reprt to do a brochure on italy such as currenices, goverment, sports, restaurants, and so far I have about 2 good website (withuout wikipedia!!!).

    asked on March 1, 2012
  73. Health care

    How has the payment of health care providers evolved over time? What caused these changes?

    asked on May 26, 2011
  74. Physics

    a bike is 25% efficient in converting energy of the bicyclist to mechanical energy. If a cyclist is travelling along a pathway at a constant speed of 5.8 m/s for 3600 s, and the average resistance is 22 N, how much mass does she lose assuming 1 kg is lost

    asked on April 12, 2011
  75. operation

    Briefly desribe the cookie production process

    asked on February 22, 2011
  76. science

    I have a container which hold 30ml of fresh water that I need to heat to boiling using electricity run through an assumed efficient resistor. Assuming an ambient temperature of 23 degrees celsius how much watt energy do I need to put into 30 ml to bring

    asked on September 21, 2010
  77. Physics

    Two vectors A and B have magnitude A = 3.00 and B = 3.00. Their vector product is A x B= -5.00k + 2.00i. What is the angle between A and B?

    asked on June 30, 2010
  78. social studies

    What will probably happen to the national identity or individual states as the European Union becomes stronger and a more important economic force?

    asked on April 17, 2008
  79. maths

    1. If the first and third of three consecutive odd integers are added, the result is 51 less than five times the second integer. Find the third integer. Let the 3 numbers be x, (x + 1) and (x + 2). Then, x + (x + 2) = 5(x + 1) - 51 Solve for x. We want

    asked on October 12, 2006
  80. maths

    1. If the first and third of three consecutive odd integers are added, the result is 51 less than five times the second integer. Find the third integer. 2. Write as a subtraction problem and evaluate. 15 less than -2 n, n+1, N+2, ... are consecutive

    asked on October 12, 2006
  81. MATHS

    A travel agent arranged a payment plan for a client. It required a down payment of $150.00 and 12 monthly payments of $642.00. What was the total cost of the plan? 2. translate into math expression and solve. Some number divided by negative four is four.

    asked on October 12, 2006
  82. Math

    3.Max says there were 6 students wearing shorts in his math class. He is not sure how many people were in the class, total, but he thinks about one third of them were wearing shorts. A. What percent is closest to 1/3 ? Explain. B.Write and solve a

    asked on April 15, 2015
  83. Calculus

    Find ¡Ò[dx/(x-2)(x+3)(x-4)] this is really confusing and I need help with it.

    asked on January 28, 2015
  84. Advanced Algebra

    If a pond can support up to 10, 000 fish, the rate of growth of the fish population is jointly proportional to the number of fish present and the difference between 10, 000 and the number of fish present. The rate of growth is 90 fish per week when 1, 000

    asked on November 15, 2014
  85. maths

    factorize completely X^2 + 2X^2 - 15X / 2X^2 - 18

    asked on July 18, 2014
  86. Maths (Integration)

    Integrate(1+x/x^3)dx Don't know how to go bout this, if the numerator was a whole number it would ve been easier for me, Pls help me out.

    asked on May 21, 2014
  87. Social Studies

    List the unique circumstances of the interwar period that may have led to ultranationalism.

    asked on October 22, 2012
  88. Social Studies

    Which underlying circumstances occurring during the interwar period of 1919 to 1939 may have influenced whether or not nationalist interest was nationalist or ultranationalist?

    asked on October 22, 2012
  89. literacy

    what sentence can you put the words collector and arrangement in 1 sentence

    asked on September 21, 2011
  90. Physics

    Aa particular bicycle is 25% effificent in converting the energy of a cyclist to mechanical energy (that is, she puts in four times as much energy as she gets out). if a cyclist is travelling along a pathway at a constant speed of 5.8 m/s for 1 h, and the

    asked on April 12, 2011
  91. social studies

    define: nation state nation-state

    asked on April 17, 2008
  92. social studies

    Physical Characteristics Of Strasbourg

    asked on April 17, 2008
  93. maths

    Solve the equation using the multiplication principle. -35 = 7k Solve the equation. clear fraction and decimal first. 2.(y-7)- (y+4)) = 6y 3. -5b - 8 = -5 - 2b - 1b Problem one: multiply both sides of the equation by 1/7 Problem two: I will be happy to

    asked on October 12, 2006
  94. us history

    How did the Homestead Strike influence the fact that President Grover Cleveland won the 1888 election? Thanks in advance. Try typing: Homestead Strike influence the President Grover Cleveland 1888 election? Into Google Search

    asked on October 8, 2006
  95. physics

    A world-class sprinter can burst out of the blocks to essentially top speed (of about 14.9m/s) in the first 11.6m of the race. How long does it take her to finish the 200m race?

    asked on June 12, 2017
  96. algebra

    I am a 5 digit number, my tens digit is thee times the hundreds digit

    asked on June 5, 2017
  97. English

    some have more than a hundred some have none

    asked on September 15, 2016
  98. physics

    A car A is 300m behind a car B and both are travelling in the same direction at 25m/s. Both cars begin at the same moment to accelerate at steady rate, but A has a greater acceleration and passes B in 20sec by which time B is doing 27•5m/s. Neglecting

    asked on April 27, 2016
  99. Electrical principles

    a. What current is flowing in a 2.0m length of wire in the Earth's field of 55μT if it experiences a force of 10mN? b. A 2 wire cable is suppling 100 A to a DC motor. Each wire has a 2 mm insulation layer and there is also a 2 mm separate insulation layer

    asked on August 14, 2015
  100. maths

    Show that r = 1/4 - 3Cos¦È is polar form of an ellipse and find its centre. pls can anyone could help with this.

    asked on May 11, 2015


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