Popular questions and responses by poppy
  1. physics

    An average of 120KW of electric power is sent to a small town from a power plant constant 10km away.the transmission lines have a total resistance of 0.4ohms, calculate the power loss if the is transmitted at 240v.

    asked on April 28, 2019
  2. Physics

    a concave lens of focal length 15cm forms an image 1/3 the size of the object. the object distance is

    asked on May 15, 2019
  3. physics

    A potentiometer circuit consists of a battery of e.m.f 5v and internal resistance 10 ohms connected in series with a 30 ohms resistor and a potentiometer wire AB of length 1m and resistance 20 ohms calculate:the total resistance of the circiuit ,the

    asked on April 26, 2019
  4. chemistry

    A piece of copper of mass 40g at 200°C is placed in a copper calorimeter of mass 60g containing 50g of water at 10°C. Ignoring heat losses, what will be the final steady temperature after stirring. (Specific heat capacity of copper= 0.4J/g°C, specific

    asked on April 8, 2019
  5. physics

    charges of +2uc,+3uc,and -8uc are placed at the vertices of an equilateral triangle of side 10cm. calculate the magnitude of the force acting on the -8uc charge due to the other two charges.?

    asked on April 26, 2019
  6. physics

    a bullet of mass 120g is fired horizontally into a fixed wooden block with a speed of 20 m/s. If the bullet is brought to rest in the block in 0.1s by a constant resistance, calculate the 1) magnitude of the 2) Distance moved by the bullet in the wood.?

    asked on April 7, 2019
  7. chemistry

    when the temperature of 4 dm3 of an ideal gas is increased from 200K to 400K and the pressure is halved, caculate the volume of the gas?

    asked on April 10, 2019
  8. physics

    an ammeter of resistance 0.1ohms has a full scale deflection of 50mA . Determine the resultant full scale deflection of the meter when a shunt of 0.0111 ohms is connected across its terminals?

    asked on April 2, 2019
  9. math

    determine the maximum area of a rectangular field that can be enclosed by 2400 m of fencing

    asked on October 23, 2011
  10. physics

    A glass bottle full of mercury has mass 500g. On being heated through 35 degree census, 12.43 gram of mercury expelled. Calculate the mass of mercury remaining in the bottle (cubic expansivity of mercury is 1.8 * 10 raise to power -4 pre Kelvin, linear

    asked on April 23, 2019
  11. History

    1. Why did early Chinese civilizations and dynasties thrive for thousands of years with little outside influence? A. The Great Wall prevented invasions.***** B. The Chinese did not need to trade for goods and resources. C. Mountains and deserts provided

    asked on April 5, 2019
  12. maths

    A cuboid has a diagonal of length 9 cm and a square base of side 4cm. What is its height?

    asked on April 10, 2019
  13. math

    the ninth term of an arithmetic sequence is 23 and the 33rd term of the sequence is -241 , calculate the sume of the first 15 terms of the sequence , using the formula s=n(2a+(n-1)d)/2

    asked on December 18, 2011
  14. Math

    the height , h(t) in metres of the trajectory of a football is given by h(t) = 2+28t-4.9t^2, where t is the time in flight, in seconds . Determine the maximum height of thefootball and the time wehn the height is reached

    asked on October 23, 2011
  15. algebra

    An apple, 2 oranges and 3 pears cost £2.10 altogether. An orange and a pear cost 64 pence. How much more does an apple cost than a pear?

    asked on January 2, 2020
  16. physics

    find the triple product of (A*B).C given that A =i + 4j, B=2i - 3j and C = i + k?

    asked on May 1, 2019
  17. physics

    Given three capacitors 0.3uF, 0.5 uF and 0.2 uF, the joint capacitance when arranged to give minimum capacitance is?

    asked on April 25, 2019
  18. physics

    A rocket of 30000kg mass acquires a speed of 2000k after takeoff. The power expended during this time is in 1minute?

    asked on April 19, 2019
  19. maths

    A man spend 3/4 of his salary on food,rent and transport and 1/10 of the remainder on clothes.what percentage of his salary is left?

    asked on April 9, 2019
  20. chemistry

    What is the percentage by mass of water of crystallization in a molecule of Na2co3.10h2o?

    asked on April 8, 2019
  21. health help me

    1. Starches and sugars that provide energy (1 point)kidneys enzymes carbohydrates vitamins 2. The system that removes waste from the body and controls the body's water levels (1 point)excretory digestive system liver kidneys 3. Organs that remove waste

    asked on November 17, 2012
  22. chemistry

    Under certain conditions, the reaction 3A+4B→5C is observed to proceed at a rate of 0.0412 M · s−1. What is the corresponding rate of change in product C?

    asked on January 25, 2020
  23. Physics

    What is the magntiude of force on a particle of mass 20kg with a displacement function S = 12.5t + t^2?

    asked on May 16, 2019
  24. physics

    how long will it take for a 1.5A current to coat evenly a layer of copper 0.1mm thick on both sides of a 12cm by 12cm copper plate(e.c.e of copper is 0.000331gC; density of copper 9gcm?

    asked on April 26, 2019
  25. physics

    The ice point of an ungraduated mercury in glass thermometer is x while it stem point is 90°This thermometer read 60°when the true tempetature is 40°c calculate the value of x?

    asked on April 22, 2019
  26. Physics

    A gun fires a bullet of a velocity of 200m/s at an angle of 40° to the horizontal. Find the velocity of the position of the bullet after 20second. Find also the range and time required of the bullet to reach the ground?

    asked on April 17, 2019
  27. physics

    What mass of methane is burnt off completely by 224cm3 of oxygen?

    asked on April 11, 2019
  28. physics

    A meter rule AB of mass 0.2kg was balanced horizontally on a single support when loads of 0.1kg and 0.08kg were placed at a distance of 60cm and 90cm respectively from A. find the position of the support and the magnitude of the downward force?

    asked on April 11, 2019
  29. mathematics

    Solve the inequality: 3(x+1) < 5(x+2) = 15?

    asked on April 10, 2019
  30. physics

    A solid weighs 10.5N in air and weighs 55N when immersnd in a liquid of density 900kgm-3. calculate the volume of the solid.?

    asked on April 9, 2019
  31. Social Studies

    Drag and drop the words and phrases to complete the sentences. disparities equalities overpopulated underpopulated emigration urbanization Rapid______ in Southeast Asia puts too much burden on infrastructure and services in cities. This leads to

    asked on April 9, 2019
  32. maths.

    1) the 1st digit of the square of the second digit 2) the sum of the 2nd and the 3rd digit is 4 3) if the 4th digit is equal to 2nd digit plus 1 4) if the 3rd and the 5th digit are 15 5) the sum of all the digit is 30 i.e when you add all your workings it

    asked on April 9, 2019
  33. math

    A ship,A moves due north at a speed of 30km/h while a second ship B moves at a speed of 20km/h on a bearing of 300' determine (a) the magnitude and direction of the velocity of B relative to A. (B) the shortest distance of approach of the two ship,if ship

    asked on April 9, 2019
  34. physics

    The binding energy of helium 4 He is 2 [atomic mass of proton = 1.00783U, atomic mass of neutron = 1.00867U] how do you calculate the mass of the atom?

    asked on April 7, 2019
  35. physics

    (1).The resistance of wire is giving by the relation Rt=Ro(1 alpha t Bt^2) T is the temperature alpha & Bt^2(beta) are constant R=Resistance of the wire in ohms Assuming the resistance of plantimum wire at 0°c,100°c,444.6°c and found to be 4.5,6.5 and

    asked on April 3, 2019
  36. chemistry

    which of the following is the entropy change positive? A. Thermal dissociation of ammonium chloride B. Reaction between an acid and a base C. Addition of concentrated acid to water D. Dissolution of sodium metal in water? please give the answer and

    asked on April 2, 2019
  37. English

    please answer these question and explain. One of the women who ...... in the premises ...... been ordered to quit? A. sells / have B. sell / has C. sell / have D. sells / has?

    asked on April 2, 2019
  38. math

    Factor each of the following expressions X^2+2x+y^2 5x^2-16x+3 (X+y)^2-64 Ax+bx-ay-by

    asked on September 4, 2012
  39. Bio

    Why do fish take in oxygen through its skin but does not release carbon dioxide through its skin.

    asked on December 21, 2011
  40. science

    your weight is 600 newtons and you have just finished building a raft which weighs 1000 newtons. what is the smallest upthrust force needed so that it will float with just you on it ? (please answer really quick )

    asked on November 6, 2011
  41. science

    what household foods/products are acids/alkali

    asked on January 9, 2008
  42. Social studies

    How did each side argue for and against the rights of states to secede from the Union?

    asked on April 17, 2020
  43. Maths

    Sarah invested £12000 into a unit trust 5 years ago. The value of the unit trust has increased by 7% per annum for each of the last three years. Before this the, the price decreased by 3% each annum. Calculate the current price of the unit trust.

    asked on October 6, 2019
  44. Careers

    I wanna know which career can i follow doing this subjects and which university offers this subjects for studying

    asked on October 6, 2019
  45. Chemistry

    In a study of halogen bond strength 0.50mol of iodine was heated in 2.5litre vessel and the following reaction occurred. Calculate the concentrations of the iodine and iodide at equilibrium at 2000k. Given that Kc=0.209?

    asked on May 16, 2019
  46. Maths

    the wages of 80 workers in a small factory is given thus. wage :- 1500 3500 6000 12000 20000 no of workers 8736 10883 11382 10367 8835 (a) what is the modal age (b) find the median wage (c) calculate the mean wage . need workings?

    asked on May 15, 2019
  47. Maths

    Calculate the actual amount paid for and the dividend received from the below transaction 600 $2 shares at 180k, dividend 7%?

    asked on May 15, 2019
  48. Maths

    Find the cost of $700 7/2% debenture stock at 84?

    asked on May 15, 2019
  49. Maths

    Calculate the compound interest on N7400 in 4 years at 6% p.a. If interest is calculated every three months.?

    asked on May 15, 2019
  50. Maths

    Gaga borrowed $2500 at 4% p.a compound interest. She repays $600 at the end of each year. Find out during which year the debt will finish.?

    asked on May 15, 2019
  51. Physics

    an electric cell of internal resistance of 0.5Π deliver a a current of 2.0A when resistance of 3Πis connected across it. the emf of the cell is

    asked on May 15, 2019
  52. Maths

    Find how much stock and returns isobtained from investing: N345 in 5% stock at 69?

    asked on May 15, 2019
  53. Physics

    the tension in a sonometet wire is tripled. the ratio of the new frequency to the initial frequency is

    asked on May 15, 2019
  54. Physics

    the frequency of a wave having wavelength 20cm and velocity 0.5m/s is

    asked on May 15, 2019
  55. engineering

    An oil company has to pay $10000 per year starting one years from today on a loan obtain for 5 years at an effective interest rate of 8%. Calculate the equivalent present value of this 5 yearly annuity.?

    asked on May 1, 2019
  56. maths

    2x-3y 2=x 2y-5=3x y?

    asked on April 30, 2019
  57. maths

    solve 2x-3y plus 2 equals x plus 2y minus 5 equals 3x plus y?

    asked on April 30, 2019
  58. maths

    A curved surface of a cone, based diameter 18cm, is formed from a sector of a circle, radius 15cm. find (a) the angle of the sector. (b) the total surface area.?

    asked on April 30, 2019
  59. maths

    solve 2x-3y 2=x 2y-5=3x y?

    asked on April 29, 2019
  60. Math

    1.find x and y if 3 raise to the power 2x-y equals 1 and 16 raise to the power x divided by 4 equals 8 raise to the power 3x-y 2. solve 2x-3y 2=x 2y-5=3x y?

    asked on April 29, 2019
  61. physics

    An airplane travel 1000k/h in a region where the Earth's magnetic field is about 5*10-5T. what is the potential diffenrence induced between the wing tips that are 70 m apart?

    asked on April 28, 2019
  62. physics

    A 20V supply is connected with a resistor of 4.0A/s 200ohm in an a.c circuit find the phase angle in the circuit?

    asked on April 27, 2019
  63. physics

    A reistance thermometer has a resistance of 20w at 0°c and 85w at 100°c if it resistance is 52w in medium calculate the corresponding temperature?

    asked on April 26, 2019
  64. maths

    An electric heater with a p.d of 240V connected across its terminals has a total resistance of 950Ω . Find the power rating of the heater?

    asked on April 26, 2019
  65. physics

    During electrolysis, 2.0 g of a metal is deposited using a current of 0.4A in 6 hours. The mass of the same metal which can be deposited using a current of 1.5A in 2 hour is?

    asked on April 26, 2019
  66. maths

    3x=16 solve for x?

    asked on April 26, 2019
  67. physics

    If the relative density of gold is 18.2, the volume of 2.4kg of gold is [Density of water = 103kgm-3]?

    asked on April 26, 2019
  68. maths

    The average of x,3,(x-n)5 and (2x-2)is 5, find the value of x?

    asked on April 26, 2019
  69. physics

    If a force of 40N stretches a wire from 20m to 20.02m, what is the amount of force required to stretch the same material from 20m to 20.07m?

    asked on April 25, 2019
  70. physics

    a child desires to reach a point that is 3.4km from its present location and in a direction that is 35° north of east.however, it must travel along streets that go either north-south or east-west. what is the minimum distance he could travel to reach his

    asked on April 25, 2019
  71. maths

    factorize 6x^2-8x+3?

    asked on April 24, 2019
  72. maths

    The number whose log is 2.9030 is?

    asked on April 22, 2019
  73. maths

    [x^2/2 -x 1/2] [1/x -1]?

    asked on April 20, 2019
  74. chemistry

    25.0cm3 of a solution containing 2.0g of NaOH per 250cm3 of a solution of H2SO4 for complete neutralization. Calculate the concentration of the acid solution in (i) mol/dm3 (ii) g/dm3? (H = 1.0, O = 16.0, Na = 23.0, S = 32.0)?

    asked on April 18, 2019
  75. chemistry

    CuSO4 + K3Fe(CN)6 = FeSO4 + K3Cu(CN)6 What is the color of 1. K3Fe(CN)6? 2. K3Cu(CN)6?

    asked on April 18, 2019
  76. physics

    A man exerts a pressure of 2.8 * 10³Nm^-2 on the ground and has 4 * 10^-2m² of his feet in contact with the ground. The weight of the man is?

    asked on April 17, 2019
  77. physics

    A body of mass 20g is suspended from the end of a spiral spring whose force constant is 0.5N/m. The body is set into a simple harmonic motion with amplitude 0.2m. Calculate the period of the motion?

    asked on April 17, 2019
  78. maths

    Resolve 5x-7/(x-1)(x-2)(x-3) into partial fraction using comparison coefficient method.pls i need ans asap with workings thanks in advance.?

    asked on April 17, 2019
  79. maths

    If in an investment, a man can make profit of 5,000 with probability of 0.8 or loss 1,000 with probability of 0.2, what is the expected profit of the man?

    asked on April 10, 2019
  80. maths

    1. Expand and simplify a) (2-x)^-2 b) (2+x)^-2 c) General formula for i) (x+y)^-n ii) (x-y)^-n iii) (x+y)^1/n iv) (x+y)^n/m v) (x+y)^-1/n vi) (x+y)^-n/m vii) (x-y)^1/n viii) (x-y)^n/m ix) (x-y)^-1/n x) (x-y)^-n/m Using Binomial theory and combination

    asked on April 10, 2019
  81. maths

    1 + root 2/ 2- root 3?

    asked on April 9, 2019
  82. physics

    "What is the phase difference of a progressive wave [y=0.5sin(2πx-60t] with a phase shift from (-2,0)to(1.5,0)"?

    asked on April 8, 2019
  83. maths

    In a certain university,the faculties A , B , C , D and E account for 15%, 20%, 25%, 10%, and 30%,respectively ,for the total admission . Suppose 5%, 5%, 8%, 3%,and 16% of the students from the respective faculty are female students. What is the

    asked on April 8, 2019
  84. physics

    1. The equilibrium constant for a certain system is 50 at 25 celsius. Calculate the free energy change 2. When the fee energy change: a) =0, the position of the equilibrium, temperature * change in entropy, free energy change at standard states

    asked on April 8, 2019
  85. maths

    Solve the equation 17=3x(x-5) correct to 2d.p?

    asked on April 8, 2019
  86. physics

    4 ways of reducing/preventing heat losses from a liquid in a calorimeter?

    asked on April 8, 2019
  87. physics

    how many moles of ammonia are produced by 2.8mol of hydrogen?

    asked on April 8, 2019
  88. maths

    Find the volume of R if logR+logR^2+LogR^4+LogR^8+LogR^16+LogR^32=63?

    asked on April 7, 2019
  89. English

    "What can we do to improve sanitation and clean water for those who lack access to a plumbing system?"Content should be more than 800 words. NO PLAGIARISM please.Thanks guys.?

    asked on April 7, 2019
  90. maths

    A curve y has gradient Dy/dx=3x^2-6x+2a)if the curve passes through the origin find it equation b)Find the area of the finite region included between the curve in a)and the x-axis.?

    asked on April 7, 2019
  91. physics

    water is pump from lake by an engine at a height of 5m above the lake surface. if the water is discharged through a nozzle of radius 7cm with speed of 33m/s calculate the power needed asumming perfect energy conversation in the system. density of water =

    asked on April 7, 2019
  92. physics

    A ball is moving at 18ms -1 in a direction inclined at 60° to the horizontal. the horizontal componet of its velocity is?

    asked on April 6, 2019
  93. maths

    A B & C contributed #8000, #6000, #4000 respectively as capital to an enterprise. Out of the total profit, C received #500 for his services as manager. Each of them received 20% on their first #3000 of His capital & the remaining profit was shared in the

    asked on April 6, 2019
  94. physics

    As the molecular complexity of the homologues increases a) the boiling point decreases in the same direction b) the density decreases in the same direction c) the solubility generally decrease d) there is no change in state e) none of the above?

    asked on April 6, 2019
  95. maths

    out of 72 students on a track team, 34 are boys what fractional past of the team are girls?

    asked on April 5, 2019
  96. physics

    calculate the energy stored in a stretched spring constant 10000Nm-1(newton per metre)when a force of 200N is applied to it's end?

    asked on April 5, 2019
  97. physics

    vector + vector?

    asked on April 5, 2019
  98. maths

    solve the equation 35x-2x^2=0?

    asked on April 5, 2019
  99. mathematics

    In a class of 20 students, 8 drink cocoa, 13 drink fanta and 5 drink cocoa only, how many do not drink cocoa fanta.?

    asked on April 4, 2019
  100. chemistry

    Indicate which type of reaction this belongs to 1) interaction of iron and steam in a closed solution 2) the action of chlorine on iron(ii)chloride solution?

    asked on April 4, 2019


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