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The life expectancy at birth (years) of males and females in some countries is shown here. Males 67 69 69 57 55 54 50 49 50 48 Females 77 76 72 60 59 57 53 51 49 50 Calculate the correlation coefficient and describe the relation. => + 0.98; strong positive relationship..

Choose the appropriate scatter diagram for the number of hours worked and determine the relationship between the weekly pay (in $) an employee gets for doing certain job. Hours worked ( x ) Weekly pay ( y ) 10 50 12 55 14 55 15 60 16 73 18 70 20 75 22 87 23 90 => Graph 4, positive..

External forces acting on a body, bring about a change in its state or configuration. The latter is possible when the body is not free to move, but the molecules are compelled to change their positions. Such forces are called deforming forces. These forces bring about a change in the leng..

One of the greatest discoveries of the eighteenth century was the discovery of electricity. Think of life today without electricity and you will realize the part electricity plays in our day to day life. Static charges will not heat a toaster or operate an electric fan. Most of the jobs we want ele..

Current Electricity - One of the greatest discoveries of the eighteenth century was the discovery of electricity. Think of life today without electricity and you will realize the part electricity plays in our day to day life. Static charges will not heat a toaster or operate an electric fan. Most o..

The anode is a region of deficiency of electrons and hence anions give up electrons here. They migrate to the anode to give up as many electrons as they have negative charges. Hence the electrode at which oxidation takes place is anode (the positively charged electrode). In this case, t..

Summary - The essential conditions to be satisfied for work to be done are: Some force must act on the object The point of application of force must move in the direction of force W = F x S SI unit of work is joule Energy is the capacity to do work The two types of mechanical energy are kinetic ene..

. Just as for a given tube, the current of fluid flowing out depends on its viscosity, the electrical current flowing for a given potential difference depends on the electrical resistance of the conducto..

(i) Sodium atom loses an electron and gets converted to a positively charged sodium ion. Sodium atom is oxidized to sodium ion. (ii) Metals ionise by losing electrons. Metal atoms undergo oxidation to form metal ions. (iii) In some cases, where a metal has a variable valency, t..

. Can you tell where each of them would be after say 20 seconds? P and Q can move in any direction. To locate the exact position of P and Q we require their direction of motion als..