A) 250
B) 275
C) 290
D) 295
Correct Answer: A
Solution :
Radius of the wheel \[=70\,\,\text{cm}=0.7\,\,\text{m}\] Circumference of the wheel \[=\left( 2\times \frac{22}{7}\times 0.7 \right)\,\,\text{m}=4.4\,\,\text{m}\] Distance to be covered in 1 min \[=\frac{66\times 1000}{60}=1100\,\,\text{m}\] \[\therefore \] Number of revolutions per minute \[=\frac{1100}{4.4}=250\]You need to login to perform this action.
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