Friday
October 24, 2014

Posts by Kabelo


Total # Posts: 68

life orention
identify two contenporary social issues in your community
August 27, 2014

Life orientation
8 ways in which ill health impact on the community
April 20, 2013

randhills college life orientation
3 environmental health hazard that cause ill health, crises, and or disasters within your community or any other community within south Africa and globally?
February 19, 2013

engineering science
If a person has a mass of 83 kg, what will that person weigh in newton
January 31, 2012

engineering science
A 250 cc motorbike must accelerate from rest to 126 km/h in 150 m in 10 seconds. Draw a velocity/time graph of the movement. (Hint: change km/h to m/s
January 31, 2012

5 ways in which the human or environmental problem impact on the community
In 10-15 lines critically discuss 5 ways in which the human or environmental problem impacts on the community
May 13, 2011

Life orientation
Identify one evironmental or human factor that causes ill health, accidents and disasters in south africa? *in 10-15 lines critically discuss 5 ways in which the human or environmental problem impacts in south africa.
May 4, 2011

physiology
please help with a link to scientific articles about metabolic demands of excercise in cardiovascular system
April 21, 2011

biochemistry
for each of these qualitative test,barfoed test,benedict test,seliwanoff test,bial test,molisch test,and iodine test, describe the class and give aspecific example of a carbohydrate that would yield a posiyive result?
April 8, 2011

chemistry
a weak acid has a pKa of 6.0. what is the ratio of conjugate acid to conjugate base at pH 5?
March 9, 2011

chemistry
describe an alternative method to prepare a 0.2M potassium phosphate buffer using KH2PO4 and KOH
February 27, 2011

chemistry
If a solution were made by mixing equal volume of 0.1M acetic acid(HA) and 0.1M Na-acetate(A^-) what pH would it gives?
February 20, 2011

chemistry
Phosphoric acid is a triprotic acid with pKa's of 2.14, 6.86, and 12.4.The ionic form that predominates at pH 3.2 is?choose the corect answer (a) H3PO4 (b) H2PO4^- (c) HPO4^2- (d) PO4^3-
February 15, 2011

chemistry
what is the [CH3COO^-]/[CH3COOH] ration in an acetate buffer (Ka=1.76 x 10^-5) at pH 3.8? show calculations
February 15, 2011

chemistry
then what must i do after i have the Ka of CH3COOH
February 13, 2011

chemistry
calculate pH of 0.1M CH3COOH of 100ml of that solution?
February 13, 2011

chemistry
calculate pH of 0.1M NH4^- of 100ml of that solution?
February 13, 2011

chemistry
these is 0.1M HCl of 100ml of that solution in a beaker,calculate pH?
February 12, 2011

chemistry
explain why you get two different pH values for same solution when calculating and using pH meter of same solution?
February 11, 2011

physics
two cars are heading at each other with the same speed v. The horn of one (f=3000Hz) is blowing,and is heard to have a frequency of 3400Hz by the people in the other car.Find v if the speed of sound is 344m/s
October 19, 2010

physics
find the ratio of the intensities of two sounds if one is 8 dB louder than the other
October 19, 2010

inorganic chermistry
what is the characteristic flame for sodium,lithium,barium,copper and calcium?explain why
October 1, 2010

inorganic chermistry
(a)explain why the colour for ions in the flame tests differ (b)Why do the chemicals have to be heated in the flame first before the colour light is emitted?
October 1, 2010

physics
consider a simple harmonic oscillation with m=0.5kg,k=10N/m and amplitude A=3cm,if the oscillation is released from rest at x=A when the clock is set to t=0,determine the position of the oscillation at t=2s
September 20, 2010

physics
What happens when the frequency of a force applied to a system matches the natural frequency of vibration of the system
September 20, 2010

physics
two notes wich have frequency ratio 2:1 are said to be seperated by an octave.A frequency wich is seperated by an octave from middle C(256Hz) is?
September 20, 2010

physics
a pendulum of length L=9.8m hangs in equilibrium and is then given velocity v=0.2m/s at its lowest point.What is the magnitude of the subsequent oscillation?
September 20, 2010

chemistry
what is the minimum number of electrons that would be expected to be in the valence shell of As in AsCl
September 20, 2010

physics
a pendulum of length L=9.8m hangs in equilibrium and is given velocoity v=0.2m/s at its lowest point.What is the magnitude of the subsequent oscillation?
September 19, 2010

chemistry
for an oxygen atom,wich requeres more energy,the addition of two electrons or the removal of one electron?explain why
September 19, 2010

chemistry
so wich one between the addition of two electrons or removal of an electron will requere more energy
September 18, 2010

chemistry
so wich one between the addition of two electrons or removal of an electron will requere more ionisation energy
September 18, 2010

chemistry
for an oxygen atom,wich requires more energy,tha addition of two electron or the removal of one electron?explain why
September 18, 2010

chemistry
why is the ionisation energy of oxgen less than that of nitrogen even if oxygen is to the right hand side of nitrogen?
September 18, 2010

chemistry
why is the 5th ionisation energy(IE) of carbon so much larger than its 4th?
September 18, 2010

physics
consider a simple harmonic oscillation with m=0.5kg, k=10N/m and amplitude A=3cm.WHat is the total energy of the oscillation,what is the maximum speed,what is the kinetic energy?
September 17, 2010

chemistry
1) A 3-fold degenrate subshell can carry a maximum number of how many electrons?
September 8, 2010

chemistry
what subshells would be found in the shells with n=3 and n=4?how many orbitals are there in a g subshell?
September 8, 2010

chemistry
write equations for the reactions of NaOH(aq) with solutions containing Al^3+ Cu^2+(aq),Pb^2+(aq) and Fe^3+(aq) ions respectively
September 5, 2010

chemistry
the major commercial aluminium ore is bauxite,AlO3.H2O(s).What is its molar mass?The analysis of a representive sample of bauxite shows it contains 70% by mass of Al2O3..What is the maximum mass of aluminium metal that could be obtained from 200kg of bauxite by the HAll ...
September 5, 2010

inorganic chemistry
what dominant colour appears for(a)the mecury street bulb (b)the sodium street lamp and (c) an incandescent bulb?
August 30, 2010

inorganic chermistry
a large number of hydrogen atoms have electrons excited to the n_h=4 state.How many possible spectral lines can appear in the emission spectrum as a results of the electron reaching the ground state(n_1=1)?
August 30, 2010

physics
help with the websites that discuss the mechanism followed during the manufacturing of a bar magnet such that it has a north and south pole
August 27, 2010

physics
two llong parallel vertical wires 0.3m apart are placed east-west of one another.The current in the eastely one is 30A and that in the other is 20A.Both currents flow upwards.The earth"smagnetic field is horizontal directed north and has magnetude field B=20x10^-6T....
August 24, 2010

chemistry
dr i can't see what you wrote here
August 16, 2010

chemistry
DR i can't see what you wrote here
August 16, 2010

chemistry
assuming that 1g of aspirin dissolves in 450ml of water at 10°C,how much aspirin would be lost in the 5ml of water added to the reaction mixture if the mixture were at 10°C during filtration?
August 16, 2010

chem102
assuming that 1g of aspirin dissolves in 450ml of water at 10°C,how much aspirin would be lost in the 5ml of water added to the reaction mixture if the mixture were at 10°C,durin filtration?
August 16, 2010

phys102
a copper wire has a diameter of 1.02mm,the wire carries a constant current of 1.67A,the density of the free electrons is 8.5X10^28 e/m^3.calculate the current density and drift velocity
August 14, 2010

phys102
please help with a website that talks about the misconsumption of electricity and their corrections
July 28, 2010

chem102
help with thes -iso and cyclo when doing the nomanclatur of organic compounds
July 25, 2010

chem102
the following names are incorrect,draw their structures and supply the correct name.(a)2-isopropylpentane (b)3-ethyl-5-methylhexane
July 24, 2010

phys101
please help with heat calculations that include the melting of ice
May 13, 2010

ohys101(heat)
a person had a skin temperature of 33degrees celcuis and was in a room where the walls were at 20degrees celcuis.if the emissivity is 1 and the body surface is 1.5meter squad,what is the rate of heat loss due to radiation? alpha=0.000000567W/meter squad k exponent 4
April 29, 2010

phys101
in a calorimeter can(water equivalent=40g)are 200g of water and 50g of ice,all at 0 degreea celcius.into these poured 30g of water at 90degrees celcuis.what will be the final temperature of the system?specific capacity of water is 4186j/kg per degrees celcius,of ice is 2310j/...
April 29, 2010

PHYS101
In a calorimeter can(water is melted above?
April 29, 2010

PHYS 101
Determine the volume of 200g of carbon tetrachloride,for wich specific gravity is 1.6
April 19, 2010

phys101
a homeowner wishes to drain her swimming pool by siphoning the water,whose depth is h,into a nearby gully a distance H below it,where H is much larger than h.She uses a pipe of cross-sectional areea a,and the pool has surface area A.How long does it take to empty the pool if h...
April 19, 2010

PHYS101
A VENTURI TUBE IS USED TO MEASURE THE WATER SPEED V IN A PIPE BY COMPARING THE WATER PRESSURE IN THE WIDE AND NARROW SECTIONS(CROSS-SECTIONAL AREAS A, A=A/4).FIND V IF THE DIFFERENCE IN MECURY LEVEL IS h=25mm.(THE DENSITY OF MERCURY IS =13600Kg/meter cube)
April 19, 2010

PHYS101
A VENTURI TUBE IS USED TO MEASURE THE WATER SPEED V IN A PIPE BY COMPARING THE WATER PRESSURE IN THE WIDE AND NARROW SECTIONS(CROSS-SECTIONAL AREAS A, A=A/4).FIND V IF THE DIFFERENCE IN MECURY LEVEL IS h=25mm.(THE DENSITY OF MERCURY IS =13600Kg/meter cube)
April 19, 2010

phys101
a hydraulic press contains oil of density=800kg/meter cube,and the areas of the large cylinder=0.5meter squad and area of small cylinder=0.0001meter squad.the mass of the large piston is 51kg,while the small piston has unknown mass m.If an additonal mass of 510kg is placed on ...
April 19, 2010

PHYS101
For a system,the cylinder on the left,at L,has a mass of 600kg and a cross-sectional area of 800centi meter squad.The piston on the right,at S,has cross-sectional area 25centi meter squad abd negligible weight.If the apparatus is filled with oil(DENSITY=0.78grams/centi meter ...
April 19, 2010

PHYS101
oil is added to the right hand arm of a U-tube containing water.The oil floats above the water to a height of h=10cm.The top of the oil+water column is a height d=2cm above the top of the water column in the other arm .Calculate the oil density?
April 19, 2010

chem101
a 0.1M NaOH solution has been prepared for you.Describe how you would prepare 1 litre of the same solution
April 11, 2010

chem101
what is the function of an indicator in a titration
April 11, 2010

chem101
if 23.74ml of 0.01470M NaOH are required to completely neutralize 25.00ml of gastric juice,calculate the concentration of the hydrochloric acid[in g/L]in stomach gastric juice
April 11, 2010

phys101
if the stress strai graph is a straight line,how much does the bar srtetch when applied force is increased by 50000N?
April 9, 2010

phys101
if the stress strai graph is a straight line,how much does the bar srtetch when applied force is increased by 50000N?
April 9, 2010

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