Page 21 - Steady Mate Tg1 - Book B

Matematik Tingkatan 1 Bab 4 Nisbah, Kadar dan Kadaran

Kadar
4.2 Rates BUKU TEKS ms. 81 – 83

MESTI TAHU & INGAT

Kadar menunjukkan dua kuantiti yang berbeza unit berhubung antara satu sama lain.
Rates show two different quantities related to each other.
Misalnya / For example
Harga jual tembikai ialah RM2.60 .
1 kg
RM2.60
The selling price of watermelon is .
1 kg

E Nyatakan kadar dan dua kuantiti yang terlibat dalam setiap situasi berikut. TP 1 ARAS R
State the rate and the two quantities involved in each of the following situations.

Situasi Kadar Kuantiti yang terlibat
Situation Rate Quantities involved
Contoh
5 km 5 km Jarak dan masa
Badrus berjoging sejauh 5 km dalam masa 1 jam. / 1 hour Distance and time
Badrus jogs 5 km in 1 hour. 1 jam

1. Encik Fong membeli 3.5 kg buah avokado dengan RM175. 3.5 kg Jisim dan harga
Mr Fong bought 3.5 kg of avocados for RM175. RM175 Mass and price

2. Puan Nayla menghidangkan 500 ml sirap bandung dalam
5 biji cawan. 500 ml / 500 ml Isi padu dan bilangan cawan
Madam Nayla serves 500 ml rose syrup in 5 cups. 5 cawan 5 cups Volume and number of cups
3. Tenaga haba yang diperlukan untuk menukarkan 1 kg ais
kepada air pada suhu tetap ialah 336 000 J. 336 000 J Tenaga dan jisim
The amount of heat required to change 1 kg of ice to water at 1 kg Energy and mass
constant temperature is 336 000 J.

F Tukarkan unit kadar yang berikut kepada unit dalam kurungan. TP 2 ARAS S
Convert the units of the following rates to the units shown in brackets.

Contoh 1. 72 km per jam (m per saat) 2. 90 km per jam (m per saat)
72 km per hour (m per second) 90 km per hour (m per second)
54 km per jam (m per saat)
54 km per hour (m per second) 72 km / 72 km 90 km / 90 km
1 jam 1 hour 1 jam 1 hour
54 km / 54 km
1 jam 1 hour = (72 × 1 000) m = (90 × 1 000) m
(1 × 60 × 60) s (1 × 60 × 60) s
(54 × 1 000) m
= 72 000 m 90 000 m
(1 × 60 × 60) s = =
3 600 s 3 600 s
54 000 m
= = 20 m per saat = 25 m per saat
3 600 s
20 m per second 25 m per second
= 15 m per saat
15 m per second

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