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. ## 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

6. ## Beryl

Pb3(ASO4)2.the solubility product expression

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

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)

9. ## chemistry

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

10. ## chemistry

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

11. ## Chemistry

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

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. ## chemistry

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

14. ## 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.

15. ## 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.

16. ## maths

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

17. ## 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

18. ## 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

19. ## 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?

20. ## 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

21. ## 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

22. ## maths

formular for finding the area of a football pitch

23. ## 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

24. ## 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

25. ## 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

26. ## Chemistry

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

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

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

29. ## 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

30. ## Chemistry

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

31. ## 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

32. ## 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

33. ## 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

34. ## 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..

35. ## 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

36. ## 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

37. ## English

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

38. ## Mabel hill, physics

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

39. ## 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

40. ## 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

41. ## Chemistry

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

42. ## 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

43. ## 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

44. ## PHYSICS

Pressure at the bottom doesnot depdnd on..

45. ## 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

46. ## life orientation

provide recommendation on how to address poverty?

47. ## Chemistry

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

48. ## 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

49. ## Chemistry practice

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

50. ## 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)

51. ## 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?

52. ## Chemistry

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

53. ## Physics/chemistry

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

54. ## 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

55. ## 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.]

N=a+bT^2

57. ## life orientation

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

58. ## Prcts chemistry

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

59. ## physics

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

60. ## 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

61. ## 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

62. ## physics,

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

63. ## 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

64. ## science

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

65. ## 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

66. ## Chemistry

Define the terms 'weak acid' and 'catenation'

1. ## Maths

solve it

posted on May 28, 2019
2. ## maths

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

How can sports detract nation building

posted on March 10, 2019
4. ## chemistry

agreed

posted on November 11, 2018
5. ## Math

posted on July 24, 2018
6. ## math

1 WHOLE NUMBER 1 OVER 3

posted on January 18, 2018
7. ## Computer

OK. Thanks

posted on September 16, 2017
8. ## 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
9. ## 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
10. ## Physics/chemistry

C?

posted on September 16, 2017
11. ## English

C. Challenges but I want to be more sure

posted on September 16, 2017
12. ## Computer

File name.. But not that sure

posted on September 16, 2017
13. ## Maths

86,100

posted on September 16, 2017
14. ## Maths

86,100

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

YES

posted on October 13, 2016
16. ## math

posted on May 15, 2016
17. ## English

Because i want too know best

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

South africa

posted on April 13, 2016
19. ## 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
20. ## PHYSICS

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

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

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

posted on August 23, 2015
22. ## Physics

DISPLACEMENT

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

provide recommendation

posted on May 8, 2013
24. ## Mpumulana

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

posted on February 6, 2013
25. ## environment

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

posted on April 15, 2012
26. ## Physics

Can someone help plz

posted on October 12, 2011
27. ## Chemistry

Thanx a lot GOD BLESS YOU

posted on September 23, 2011
28. ## environment

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

posted on July 18, 2011
29. ## physics

Heat is moving inward

posted on July 17, 2011
30. ## 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