2006-09-26 06:45:51 · 5 answers · asked by praveena k 1 in Science & Mathematics ➔ Mathematics
To find the circumference of the tyre, you firstly need to calculate the distance travelled per minute by the tyre.
Thus 40km/hr = 40000 metres per hour. (Then divide by 60 to get distance per minute)
Thus 40000/60 = 666.667 metres per min.
As the wheel rotates 150 time every minute you can then calculate how far the tyre travels for every revolution.
Thus 666.67 / 150 = 4.444 metres per revolution of the wheel.
This distance travelled per revolution is also the circumference of the wheel. Therefore the wheel circumference is 4.444 metres.
Hope this helps.
2006-09-26 06:57:51 · answer #1 · answered by Hepialid 2 · 0⤊ 0⤋
The car speed is 40 Km/hr. That is 0.66 Km/min. On the other hand, the distance the car travels in one minute is equal to the tire's rpm multiplied by its circumfrance (Since it travels a distance equal to its crcmfrnce in one rotation of the tyre). That is:
X=150*P
which we know equals 0.66 Km. Thus P=4.4 m
2006-09-26 06:56:32 · answer #2 · answered by Mahyar 3 · 0⤊ 0⤋
40 Km/hr = 40/60 Km/min = 2/3 Km/min
In one minute the tyre rotating 150 times.
Therefore the circumference is (2/3)/150 = 2/450 Km = 1/225 Km = about 4.44 metres
2006-09-26 06:55:22 · answer #3 · answered by ? 7 · 0⤊ 0⤋
150 rpm = 150 X 60 = 9000 revs/h
Speed: 40km/h = 40 000m/h
9000 revs in 40 000 m gives one revolution (which is the circumference) in 40 000 divided by 9000 = four and four ninths meter .
2006-09-26 07:57:53 · answer #4 · answered by Chris G 1 · 0⤊ 0⤋
C=pie x d
40km/h = 40000m/h = 666.67m/min.
666.67/C = 150
C = 666.67/150
C = 4.45m
2006-09-26 06:53:36 · answer #5 · answered by Anonymous · 0⤊ 0⤋