A tire rotates 140 rpm, how many rotations have been completed in 20 seconds?
rpm stands for rotations per minute, and 20 seconds is 1/3 of a minute, so divide 140 by 3 and you will have your answer!
140rev/60s * 20s =
To find the number of rotations completed in 20 seconds, you need to know the rotation rate in revolutions per minute (rpm) and then convert it to revolutions per second (rps).
Given that the tire rotates at a rate of 140 rpm, you can calculate the number of revolutions per second by dividing the rpm by 60 (since there are 60 seconds in a minute):
140 rpm ÷ 60 = 2.33 rps (rounded to two decimal places)
Now that you know the rotation rate in rps, you can determine the number of rotations completed in 20 seconds by multiplying the rotation rate by the time in seconds:
2.33 rps × 20 seconds = 46.6 rotations (rounded to one decimal place)
Therefore, approximately 46.6 rotations have been completed in 20 seconds.