Consider that in country A, one million children were born in the year 2005. Out of these, 50,000 children died before the age of one. What is the infant mortality rate of country A?
Answers
Infant mortality rate is calculated using the following formula
Number of infants that died i a year/ Total number of children born in a given year x 100
Explanation:
As per data given in the question:
total children died= 50,000
total children born=10,00,000
so the infant mortality rate is as follow
50,000/ 10,00,000 x 100
mortality rate = 5%
➤ Answer :
➠ Question 1
Explain about work and enegry with examples.
➵ Answer 1
Work is said to be done when a force is applied on an object causing some displacement. Work is equal to the product of force and displacement. W = Fs. It is a scalar quantity. It's s.i. unit is joule.
Example - When we kick a ball ( force ) it is displaced from its original position.
Energy is defined as the capacity of doing work or any object that possesses energy can do work. It's s.i. unit is joule.
Example - When we are pushing an object we are using energy.
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➠ Question 2
Explain about types of energy with example.
➵ Answer 2
There are mainly two types of energy -
Kinetic energy.
Potential energy.
Kinetic energy - It is the energy possessed by a body by virtue of it's motion.
Formula of kinetic energy = \tt \cfrac{1}{2} \: m {v}^{2}
2
1
mv
2
Example - A bullet fired from gun can pierce a target due to it's kinetic energy.
Potential energy - It is the energy possessed by a body by virtue of it's position.
Formula of potential energy = \tt mghmgh
Example - The potential energy of the wound spring of a clock is used to drive the hands of the clock.
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➠ Question 3
Explain about free fall.
➵ Answer 3
When a body falls under the effect of the gravitation force of the earth alone then the body is said to be in the condition of free fall and the body is known as free falling body.
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