Most popular questions and responses by Gift
1. ## physics

A 10uf capacitor is charged from a 30v supply and then connected across an uncharged 50uf capacitor.Calculate a. The final potential difference across the combination b. The final and initial energies

2. ## PHYSICS

THE MASS OF VENUS IS 81.5% OF THE EARTH AND ITS RADIUS IS 94.9% THAT OF THE EARTH. A)COMPUTE THE ACCELERATION DUE TO GRAVITY ON THE SURFACE OF VENUS FROM THESE DATA.B)IF A ROCK WEIGHS 75.0N ON EARTH,WHAT WOULD IT WEIGH ON THE SURFACE OF VENUS?

3. ## maths

D is partly constant and partly varies with V. when V=40, D=150 and when V=54, D=192. (i)find the formula connecting D and V (ii) find D when V =73.

4. ## Civics

Major local civic problems

5. ## Beryl

Pb3(ASO4)2.the solubility product expression

6. ## science

an you please solve the questions for me 1. 3 moles of pesticide of molecular mass 200 g/mole is applied to a closed system consisting of 20 m3 of water, 10 m3 of air, 1 m3 of sediment, and 0.001 m3 of fish. Determine the concentration and amount in both

7. ## maths

A girl starts at A and walks 2km south to B.she then walks 3km west to C.find the distance and bearing of C from A.

8. ## chemistry

separation techniquesfor silver chloride and sodium trioxonitrate(v).and properties of the three state of matter.

9. ## Math

The quantity is partly constant and partly varies inversely as the square of x. When w=1,x=11 and when w=2,x=5. Find the formula connecting w and x find w when x=4.

10. ## chemistry

Use the bond enthalpies and bond energies in the data book in themochemical equations to calculate the reaction enthalpy of: H2(g) +Br2(g) -> 2HBr(g)

11. ## chemistry

By using the bond enthalpies and bond energies in thermochemical equations to calculate the reaction enthalpy of; H + Br=2HBr

12. ## Chemistry

How many moles of silver will be deposited from a silver (i) trioxonitrate (v) solution by 16.0g of copper (Ag=108,Cu=63.5)

13. ## Science

What is the formular of kenetic energy

14. ## chemistry

properties of the three state of matter.and seperation techique for silver chloride and sodium trioxonitrate(v)

15. ## university of calabar

A stoppered flask at 25 0C contains 250 ml water, 200 ml octanol, and 50 ml of air. An unknown amount of o-xylene is added to the flask and allowed to partition among the phases. After equilibrium has been established, 5.0 mg of o-xylene are measured in

16. ## Chemistry

What are the two electronic structural conditions for the stability of an atom?

17. ## Science

A car is moving at a constant velocity when it is involved in a collision.the car comes to rest after 0.45sec with an average acceleration of 65,0 m/s2 in the direction opposite that of the car's velocity. What was the speed ,in km/h, of the car before the

18. ## physics

You are on a new planet and want to know the acceleration due to gravity. You take a ball and kick it at an angle of 18.0° at a speed of 22.1 m/s. If the ball is in the air for 7.40 s, what is the magnitude of the acceleration due to gravity?

19. ## maths

I added 18 to 3 times a number, the result is equal to 5 times the number. what is the number ?

20. ## Math

The quantity is partly constant and partly varies inversely as the square of x. When w=1,x=11 and when w=2,x=5 find the formula connecting w and x find w when x=4

21. ## maths

The formula P=9d + 320 is the cost of buying an article "p" while "d" is the number of articles bought. if P=N797.00 find the number of articles.

22. ## physics

a plane is headed north with a velocity of 400km/hr and west wind blowing at 70km/hr.find the distance of the plane from its base in 2hrs

23. ## physics

When water falls from the top of the waterfall,at the victoria falls in zimbabwe,the temperature of the water at the top is less than the temperature at the bottom.If 180.5g of water falls a distance of 125.0m, calculate the increase in temperature of the

24. ## chemistry

what is hydrogen?

25. ## Pre-calculus

A researcher performs an experiment to test a hypothesis that involves the nutrients niacin and retinol. She feeds one group of laboratory rats a daily diet of precisely 34.53 units of niacin and 25,430 units of retinol. She uses two types of commercial

26. ## science

a plane is headed north with a velocity of 400km/hr and west wind blowing at 70km/hr.find the distance of the plane from its base in 2hrs

27. ## physics

a plane is headed north with a velocity of 400km/hr and west wind blowing at 70km/hr.find the distance of the plane from its base in 2hrs

28. ## Chemistry

Calculate the enthalpy of combustion of acetylene(per mol acetylene)using bond enthalpies and energy diagram

29. ## maths

formular for finding the area of a football pitch

30. ## Chemistry

Calculate the enthalpy of combustion of acetylene(per mol acetylene) using bond enthalpies and energy diagram

31. ## Chemistry

Use the bond enthalpies and bond energies from the data book in themochemical equations to calculate the reaction enthalpy of:H2(g) + Br2(g) ->2HBr(g) and show your workings in the question above in an energy level diagram.please..

32. ## Chemistry

1)Define the term'geometric isomers' 2)Give geometric isomers and corresponding names for the following condensed structural formula: CH3CH2(CH)2CH3

33. ## Chemistry practice

Glycine is the amino acid used to make proteins a)for each mole of glycine that burns,973.49k/mol of which is libarated eqution and the values of delta Hf^o for the products of combustion to calculate the enthalpy of formation for glycine.Represent your

34. ## life orientation

provide recommendation on how to address poverty?

35. ## PHYSICS

AT WHAT DISTANCE ABOVE THE SURFACE OF THE EARTH IS THE ACCELERATION DUE TO EARTH'S GRAVITY 0.980M/S² IF THE ACCELERATION DUE TO GRAVITY AT THE SURFACE HAS MAGNITUDE 9.80M/S²

36. ## science

3 moles of pesticide of molecular mass 200 g/mole is applied to a closed system consisting of 20 m3 of water, 10 m3 of air, 1 m3 of sediment, and 0.001 m3 of fish. Determine the concentration and amount in both grams and mole units in air, water, sediment

37. ## statistics

The time required by workers to complete an assembly job has a mean of 50 minutes and a standard deviation of 8 minutes. To spot check the workers' progress on a particular day, their supervisor intends to record the times 60 workers take to complete one

38. ## Chemistry

Xenon is one of the noble gases, and is generally quite unreactive.in fact,it was long believed that all the noble gases were totally unable to form compounds.It came as quite a surprise,therefore,when it was discovered that some of its compounds could be

39. ## Mabel hill, physics

Two force,3N and 4N act on a body in the direction due north and east respectively. Calculate their equilibrium?

40. ## Life orientation

Idemtify 3 enviromental health hazards that causes ill health,accidents,crises and disaster within a community in South Africa and globally.include evidence that is current of the identified issues

41. ## Chemistry

Calculate the pH of 0.0115M acetic acid solution at 25 degrees celcius with Ka=1.75*10^-5

42. ## Chemistry practice

Calculate using the enthaly of formation,the enthalpy of combustion of methanol,CH3OH

43. ## Maths,variation

the distance covered by a falling ball varies as the square of the time taken. If a ball falls through 1800m in 15seconds,calculate the distance when the time taken is 15seconds and the time taken for is distance of 648m.solve using variation

44. ## Physics/chemistry

Which of the following substances does not conduct electricity? A. Graphite B. Glass C. Sulphuric acid D. Table salt solution

45. ## Physics/chemistry

Which of the practices will lead to losses in electrical power transmission? A. Using transmission cables of large diameter B. Transmitting at high voltage and low current C. Transmitting at relatively low voltage and high current D. Using a step-up

46. ## Computer

The name given to program that is stored in the system or in a diskette is known as... A. Index B. Icon C. File name D. None of the above

47. ## English

What a....! The more you look, the less you see. A. Wonder B. Miracle C. Challenges D. Paradox

48. ## Maths

A bank charges 2 1/2% commission for issuing a bank draft. If a customer obtained a bank draft for #84,000 from the bank, calculate the total cost of the bank draft

49. ## PHYSICS

Pressure at the bottom doesnot depdnd on..

50. ## Mechanics

A constant force of 40newton is applied tangentally to the rim of the wheel with 20cetimetre radius the wheel hs moment of intial 30kg find (a)angular acceleration (b)angular speed after 4second frm rest (c)d number of revolution made in(d)show that d work

51. ## life orientation

identify one enviromental or human factor that causes ill health, accident crises, and disaster within your community

52. ## Chemistry

Write down (a) condensed and (b) skeletal structural formulas for isomers of an organic substance whose chemical formula has 5 carbon atoms and 12 hydrogen atoms and (c) provide the common name for each of the isomers

53. ## physics

A piece of metal has a density of 0.20g/cm^3.what is the volume in cm^3 of a 1g sample of a substance?

54. ## physics

a)Hydrogen has a much higher specific heat capacity than milk. What can you say about the specific heat capacity of hydrogen?b)wrap a cotton wool around a thermometer,will its temperature rise?Explain your answer c)if you are holding a metal nail with one

55. ## Chemistry

Standard enthapies of formation are not always like bond enthalpies.Explain

56. ## Physics

Malaan is travelling from Makhado to Polokwane by taxi at a speed of 120km/h.A Nissan bakkie passes the taxi while it is on its way to Polokwane and is moving at 150km/h. a) Determine Malaan's velocity with respect to the Nissan bakkie b) what is the taxi

57. ## Chemistry

Skeletal structural formulas of pentane,2 methyl butane and 2,2 dimethyl propane

58. ## Chemistry practice

Using the form of energy diagram,make a concept map of the two different methods of calculation of reaction enthalpy(via the bond enthalpy and via the enthalpy of formation)

59. ## chemistry

State whether each of the following will increase,decrease or unchange when catalyst is added to the reaction and give an explanation for your answer please a) rate of reaction b)activation energy c)reaction enthalpy d)equilibrium of reaction

60. ## Biology

The reproductive system of a male mammal is made up of... A. Claspers, prostrate gland, sperm duct and vas deference. B. Festis, prostrate gland, sperm duct and vas deferens. C. Oviduct, urethra, testis, and sperm duct. D. Testis, uterus, prostrate gland

61. ## math

Two chords in a circle are equal in lengh.The distances from the centre of the circle can be represented by x2 and 4x respectively.How far is it chord from the centre of the circle?[Under the topic of properties of a circle.]

62. ## Chemistry

Define the terms 'weak acid' and 'catenation'

63. ## physics

What is the boiling and freezing points of celsius scale and kelvin

65. ## physics,

A 40degree Celsius thermometer reads 0.7degree Celsius at it boiling point of water. Evaluate the correct thermometerwhen it reads at 30degree Celsius

N=a+bT^2

67. ## science

For the monatonic gas in #3,estimate the momentum of the gas for a particle mass of 3x10^-4g

68. ## Prcts chemistry

Calculate the pH of 0.0115M acetic acid solution at 25 degrees celcius with Ka = 1.75*10^-5

69. ## Maths

M varies directly as n andinversely as the square of p. Given that m=3 when n=2 and p=1, write down an equation connecting gmnp

1. ## Lo

posted on August 24, 2019
2. ## Maths

solve it

posted on May 28, 2019
3. ## maths

posted on April 27, 2019
4. ## Life orientation

How can sports detract nation building

posted on March 10, 2019
5. ## chemistry

agreed

posted on November 11, 2018
6. ## Math

posted on July 24, 2018
7. ## math

1 WHOLE NUMBER 1 OVER 3

posted on January 18, 2018
8. ## Computer

OK. Thanks

posted on September 16, 2017
9. ## Physics/chemistry

So according to your explanation, transmitting at high voltage and low current will lead to losses in electrical power transmission right? Which is option B. Though am not a science student rather Art but the question appeared on my hnd aptitude test, so I

posted on September 16, 2017
10. ## Biology

That's how the spellings are on d question paper they gave us. D only mistake I made was the one I wrote 'vas deference instead of vas deferens' other ones are the same on my question paper. Thanks

posted on September 16, 2017
11. ## Physics/chemistry

C?

posted on September 16, 2017
12. ## English

C. Challenges but I want to be more sure

posted on September 16, 2017
13. ## Computer

File name.. But not that sure

posted on September 16, 2017
14. ## Maths

86,100

posted on September 16, 2017
15. ## Maths

86,100

posted on September 15, 2017
16. ## Social Studies

YES

posted on October 13, 2016
17. ## math

posted on May 15, 2016
18. ## English

Because i want too know best

posted on April 24, 2016
19. ## Life orientation

South africa

posted on April 13, 2016
20. ## Trigonometry

The bearing of town P and Q is 315°, while town R is south of town P and west of town Q. if town R is 60km away from town Q, how far is town R to from town P

posted on March 22, 2016
21. ## PHYSICS

200gX12.5cm=12.5cmXp. p=200g

posted on September 10, 2015
22. ## life orientation

bad road that direct impact on the physical, emotional, social and economic

posted on August 23, 2015
23. ## Physics

DISPLACEMENT

posted on July 7, 2015
24. ## Life orientation

provide recommendation

posted on May 8, 2013
25. ## Mpumulana

Why do some criminals use facebook as a tool to achieve their goal

posted on February 6, 2013
26. ## environment

5 ways in which the human or enviromental problem impacts on the community

posted on April 15, 2012
27. ## Physics

Can someone help plz

posted on October 12, 2011
28. ## Chemistry

Thanx a lot GOD BLESS YOU

posted on September 23, 2011
29. ## environment

In 10-15 line critically discuss 5 ways in which the environment problem impect on the community

posted on July 18, 2011
30. ## physics

Heat is moving inward

posted on July 17, 2011
31. ## Chemistry

Hydrogen has a much higher specific heat capacity than milk.what can you say about the specific heat capacity of hydrogen?

posted on July 16, 2011