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प्रश्न
An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 minutes 20 s?
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उत्तर
Diameter, d = 200 m, r = `d/2` 100 m
Time for one round = 40 s
Distance travelled in 2 minutes and 20 s
(2 × 60 + 20 = 140 s)
= `140/40`
= 3.5 rounds
Distance travelled = Circumference of the circle × 3.5
= 2πr × 3.5
= `2 xx 22/7 xx 100 xx 3.5`
= 2200 m
Displacement after 3.5 rounds
= diameter of the track
= 200 m
संबंधित प्रश्न
Fill in the following blank with suitable word :
Displacement is a…………………… quantity whereas distance is a………………………….
If the displacement of an object is proportional to the square of time, then the object is moving with :
Differentiate between distance and displacement.
Write an expression for the distance S covered in time t by a body which is initially at rest and starts moving with a constant acceleration a.
Explain the following concept in your own words with everyday examples:
Distance
Copy the following table and fill in the blank spaces.
| Quantity | S.I. Unit | Scalar or Vector |
| Displacement | ___________ | ___________ |
Which of the following figures represent uniform motion of a moving object correctly?
Give some examples for vector quantity.
An object is dropped from rest at a height of 150 m and simultaneously another object is dropped from rest at a height of 100 m. What is the difference in their heights after 2s if both the objects drop with the same accelerations? How does the difference in heights vary with time?
Choose the correct option.
