Peter rides his bike at a speed of 27 km/h.
What is this speed in m/s?
(A) `7.5`
(B) `18.75`
(C) `97.2`
(D) `450`
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Peter rides his bike at a speed of 27 km/h.
What is this speed in m/s?
(A) `7.5`
(B) `18.75`
(C) `97.2`
(D) `450`
`A`
`text(27 km/h)` | `= 27\ 000\ text(metres per hour)` |
`= (27\ 000)/60\ text(metres per minute)` | |
`= (27\ 000)/(60 xx 60)\ text(metres per second)` | |
`=7.5\ text(m/s)` |
`=> A`
During a ten-minute period, Kath is exercising and Jim is resting.
How much more air would Kath breathe than Jim during this time?
(A) 40 Litres
(B) 94 Litres
(C) 940 Litres
(D) 1060 Litres
`C`
`text(Kath’s air volume)`
`= 10 xx 100`
`=1000\ text(L)`
`text(Jim’s air volume)`
`= 10 xx 6`
`= 60\text(L)`
`:.\ text(Extra air that Kath breathes)`
`= 1000 – 60`
`= 940\ text(L)`
`=> C`
Bhawana purchases pool chlorine in a new container which holds 35 kg.
She begins using this new container on the first day of a week.
How many full weeks should this container last? (2 marks)
--- 4 WORK AREA LINES (style=lined) ---
`text(15 full weeks.)`
`text(Cups used per week)` | `= 3 + 6 = 9` |
`text(Chlorine usage per week)` | `= 9 xx 250text(g)` |
`= 2250 text(g)` |
`text(Total chlorine available)\ = 35text(kg) = 35\ 000\ text(grams)`
`text(Time it will last)` | `= (35\ 000)/2250` |
`= 15.555…` |
`:.\ text(The container will last 15 full weeks.)`