Tuesday, February 19, 2019

yl: geography

CONTINUED FROM PAGE 1 picture that represents two things:

FOR EXAMPLE Cloud cover at a particular time is n Indicated by filling in certain portions of the circle. n The greater the fill, the more the cloud cover, measured in eighths or oktas. Wind direction is represented by an arrow pointing in the direction from where the wind is coming. n The wind speed is denoted by ‘feathers’ on the wind arrow – a short feather indi- cating five knots, a larger one 10 knots, a long and short one 15 knots, and so on. Temperature is measured in degrees Celsius to the nearest whole degree. Pressure at a station is standardised to sea-level pressure measured in millibars. n Sometimes the hundreds figure for the pressure is omitted as being understood, since the pressure is almost always between 950 and 1050 millibars. n For example, a pressure of 987.8 millibars would be written as 878; 1014.3 millibars as 143. In the next lesson, we will look at how to illustrate weather systems using isobars and relevant symbols.

n The cloud cover n The wind speed.

The central circle represents the cloud cover. A black circle means the sky is com- pletely overcast and cloudy, and a white or empty circle means that the sky is com- pletely clear of clouds. The amount of black shown in the circle tells the fraction of the sky that is covered. It’s like cutting up a pie to represent one half or one quarter. Weather symbols are plotted on a synoptic chart used for weather forecasting, and show the position of weather stations collecting information about the weather and details of the various weather elements.

The position of a meteorological station is marked by a small circle.

The weather report for each station is then plotted in and around the circle. n Elements like temperature and pressure are entered as plain figures. n Others, like the occurrence of rain, snow, cloud and fog, are plotted as interna- tionally agreed symbols.

Send comments kerry-ann.hepburn@gleanerjm.com.

yl: mathematics

CONTINUED FROM PAGE 21 Substituting M = 6 – 4 , –3 + 1 = 2 , – 2 2 2 2 2

(ii) The gradient of the line K.

The correct answer for a. is: M = ( 3 , 6)

( )

(3) Given the points X ( 1 , 0) and Y (– 2 , a ), if the gradient is 2/3, find a.

HOMEWORK (1) Given the points A (2 , – 3) and B( 4 , – 5), find the values of: (a) m (Gradient) (b) M (Midpoint) (2) The line K passes through the points A (6, 6) and B (0, – 2).

(4) The line segment connects the points M (1, 8) and N (r, s). If the midpoint of MN is (4, 5), calculate the values of r and s.

M =(1 , –1 )

PRACTICE EXAMPLE Find the coordinates of the midpoint of the line the following points.

Have a good week.

Find: (i) The midpoint of the AB.

a. A ( 2 , 4) B ( 4 , 8) b. X ( 3 , – 4) Y (– 5 , 0)

Clement Radcliffe is an independent contributor. Send comments to kerry-ann.hepburn@gleanerjm.com.

yl: mathematics

CONTINUED FROM PAGE 23 then Soviet Union, Japan, South Africa, Australia, and New Zealand. As living standards in most poor countries began to rise in subsequent decades, they were renamed the ‘developing countries’. The business dictionary outlined that economic development is a progress in a country’s finances and it usually refers to the adoption of new technologies; with the transition from agriculture-based to industry-based economy, and the general improvement in living

standards. Human development, on the same hand, is defined as the process of enlarging people’s freedoms and opportunities and improving their well-being. The Economic Times further alluded that the Human Development Index is a statistical tool used to meas- ure a country’s overall achievement in its social and economic dimensions, which are based on the health of people, their level of education attainment and their standard of living.

of development. Happy readings to all.

SOURCES USED Sen, A. (1995. Development as freedom. Oxford University Press. New York. wwww.britannica.com ww.jm.undp.org

Nicole Baker teaches at Eltham High School. Send comments to kerry-ann.hepburn@gleanerjm.com.

In the next lesson, we will be looking at the indicators

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