The average speed of a object after completing a circle of 5m radius in 5seconds is?
Correct answer: A. 2π
- A. 2π
- B. π
- C. Zero
- D. 10π
Explanation
Average speed is defined as the ratio of total distance and total time to cover that distance. Average Speed = Total distance / Total time. The total distance covered in a circle will be calculated using the circumference of the circle. C = 2πr. C = 2π(5). C = 10π. The distance covered in a circle is 10π. The total time taken is given as 5 seconds. Avg Speed = 10π/5. Avg Speed = "2π".
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Angular and Linear Quantities
Rotational motion relates angular displacement, angular velocity and angular acceleration to linear displacement, tangential velocity and tangential acceleration through the radius. Questions use radians, v equals r omega and tangential acceleration, while distinguishing tangential velocity from centripetal acceleration and angular quantities from their linear counterparts.
Practise Rotational and Circular Motion
521 free Rotational and Circular Motion MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Angular and Linear Quantities questions
If angular frequency is doubled, centripetal force becomes:
The acceleration is 4 when:
A car accelerates from 0 km/hto 72 km/h in 5 seconds. If it has wheels of diameter 50 cm. the angular acceleration of its wheels is:
The tyres on a bicycle have a diameter of 24 inches. If the tyres are turning at a rate of 50 revolutions per minute, determine the bicycle's speed in miles per hour (mph).
An object moving in a circle is tied to a string. What happens when the string is cut?
When a body moves in a circle of radius r with angular speed w, its centripetal acceleration is: