Question

Suppose a bike wheel has a diameter of 70 cm and the rider completes one cycle in
0.8 s. What is the speed of the bike?

Answer 1

Answer:

Step-by-step explanation:

radius 70/2=35 cm

circumference=2πr=2π×35=70π cm

time taken to complete one revolution=0.8 s

or distance covered in 0.8 s=70π

distance covered in 1 s=70π/0.8=700 π/8=175 π/2 s=87.5 π≈274.9 cm

speed=274.9 cm/s=2.749 m/s

Answer 2

Based on the diameter of the wheel, we can calculate that the speed of the bike is 2.75 m/s

First find the circumference of the wheel:

= π x diameter

= π x 70 cm

= 220 cm

Convert this to meters:

= 220cm / 100 cm per meter

= 2.20 meters

The speed is:

= Distance /Time

= 2.20 / 0.8

= 2.75 m/s

In conclusion, the speed is 2.75 m/s

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