(b) During a severe snowstorm, a layer of snow (ice crystals) forms on the body of an animal in a
field. The snow and the surrounding air are at 0°C. The snow begins to melt.
(i) The mass of snow that falls on the animal is 1.65 kg. The specific latent heat of fusion of
snow is 330000 J/kg.
Calculate the thermal energy needed to melt this snow.
thermal energy
[2]
Answers
Explanation:
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Multiplication of Fractions
In multiplication of fractions to multiply a fraction by one or more natural numbers or fractions, proceed as follows:
(i) Convert the natural numbers (if any) to improper fractions.
(ii) Convert the mixed numbers (if any) to improper fractions.
(iii) Multiply numerator with numerator and denominator with denominator and cancel the common factors of the numerator and denominator and place the product of the numerator over the denominator.
(iv) Convert into mixed fraction if needed.
Product of two fractions = Product of their numerators
Product of their denominators
[Place the product of the numerators over the product of the denominators]
i.e., a/b × c/d = (a × c)/(b × d)
There are three steps to multiply fractions are:
1. Multiply the numerators of the fractions (the top numbers).
2. Multiply the denominators of the fractions (the bottom numbers).
3. Simplify the fraction if needed to the lowest terms.
For example:
(i) 3/7 × 4/5
= (3 × 4)/(7 × 5)
= 12/35
(ii) 7/3 × 5/2
= (7 × 5)/(3 × 2)
= 35/6
(iii) 5 × 3/7
= 5/1 × 3/7
= (5 × 3)/(1 × 7)
= 15/7
(iv) 5/12 × 9
= 5/12 × 9/1
= (5 × 9)/(12 × 1)