Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • NCERT
  • The wheels of a car are of diameter 80 cm each. How many complete revolutions does each wheel make in 10 minutes when the car is travelling at a speed of 66 km per hour?

4. The wheels of a car are of diameter 80 cm each. How many complete revolutions does each wheel make in 10 minutes when the car is travelling at a speed of 66 km per hour?

Answers (1)

best_answer

Let the number of revolution of the wheel be n.

The circumference of the wheel is given by: 

        \\=\ 2\pi r\\\\=\ 2\pi \times 40\ =\ 80\pi\ cm

                                                                       

Now, the speed of the car is given by: 

         \\=\ 66\ Km/hr\ \\\\=\ 66\times \frac{100000}{60}\ cm/min\ \\\\=\ 110000\ cm/min.

Thus, the distance travelled in 10 minutes is:  =\ 1100000\ cm

According to the question, we get:

                                        n\times 80\pi\ =\ 1100000

or                                               n\ =\ 4375

Hence, the number of revolutions made by the wheel is 4372.

Posted by

Devendra Khairwa

View full answer

Similar Questions

Trending Articles/News

anam-khan

CBSE Class 10 board exams from February 15 to March 18; download date sheet 2025 PDF
anam-khan

CBSE Date Sheet 2025 Live: CBSE Class 10, 12 board exam timetable soon at cbse.gov.in; practical dates
anam-khan

CBSE Date Sheet 2025 Live: CBSE to announce Class 10, 12 board exam dates soon at cbse.gov.in; sample paper

Latest Question