poppy

Most popular questions and responses by poppy
1. 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

2. 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.?

3. 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

4. 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

5. 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?

6. 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?

7. 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?

8. 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

9. 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?

10. 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?

11. 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

12. 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.

13. 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?

14. physics

1. Solve 5x*6×5*3*x-4 2. 3*4y*5 ×9*-2y*-2 3. 16x*5-4*-2x*3×(2x*2)*-3?

15. maths

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

16. Maths

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

17. 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?

18. physics

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

19. 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)?

20. 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.?

21. 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

22. Maths

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

23. maths

The number whose log is 2.9030 is?

24. physics

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

25. chemistry

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

26. 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.?

27. 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?

28. 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

29. maths

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

30. maths

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

31. Bio

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

32. 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?

33. 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?

34. 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?

35. 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.?

36. 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)"?

37. 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?

38. 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.?

39. chemistry

(1) define the term metallic lustre and nonmetallic lustre ? (2) highlight the different between them as well as given two example of each mineral that exhibit the major types of crystal?

40. 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

41. maths

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

42. 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?

43. maths

factorize 6x^2-8x+3?

44. 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

45. maths

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

46. 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

47. Maths

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

48. maths

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

49. 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

50. 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?

51. 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?

52. chemistry

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

53. maths

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

54. 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.?

55. physics

A string under tension produces a note of frequency 14Hz. Determine the frequency when the tension is quadrupled????

56. maths

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

57. 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.?

58. 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

59. 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

60. physics

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

61. 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?

62. Physics

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

63. 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.?

65. math

solve these ⅛ /¾?

66. Physics

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

67. 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

68. 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?

69. maths

3x=16 solve for x?

70. physics

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

71. maths

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

72. physics

Using the simultaneous or matrix method to solve the following: (1) 450alpha 4500B(beta).......eqn(2) (2) 2000.7alpha 889511.22B...eqn(3)?

73. 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.?

74. 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?

75. English

Choose the option that has the same vowel sound as the one represented by the letters underlined. boat? A. board B. bought C. go D. glory

76. 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

77. physics

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

78. 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

79. English

You may not have heard the last word on the matter ...... ? A. may you have B. haven't you C. have you D. mayn't have you just the reason for the answer.

80. 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?

81. 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?

82. Math

An ice cream stand has nine different flavors. A group of children come to the stand and each buys a double scoop cone with two flavors of ice cream.If none of the children choose the same combination of flavors ,but all possible combinations of flavors

83. 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

84. math

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

85. Physics

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

86. 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?

87. maths

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

88. maths

1 + root 2/ 2- root 3?

89. Physics

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

90. physics

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

91. 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?

92. 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

93. FL studies weekly or social studies

in my newspaper why did the French and Spanish start fighting?

94. 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.?

95. physics

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

96. 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?

97. 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 =

98. Maths

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

99. mathematics

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