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primary 6 |
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Please help. Thk u
= 59.2 cm + 2 x radius of circle
= 59.2 cm + 2.9 cm + 2.9 cm
= 65 cm
Distance between 2 walls
= 11.2 m
= 11.2 x 100 cm
= 1120 cm
So, for the skateboard to move to the other wall and touch it,
Distance travelled by skateboard
= Distance between 2 walls - length of skateboard
= 1120 cm - 65 cm
= 1055 cm
Distance travelled by each wheel in
one complete revolution
= circumference of the circle
= 2 π r
= 2 x 3.14 x 2.9 cm
= 18.212 cm
Number of complete revolutions
= Distance travelled by skateboard
÷ distance travelled by 1 wheel in one complete revolution
= 1055 cm ÷ 18.212 cm
= 57.9288381
≈ 57 (nearest whole number)
(Note : the answer is not 58 as the last revolution was not complete. So only 57 complete revolutions were made by each wheel)
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Hope this helps.