An object moves uniformly on a circle of radius 2 m with a period of 10 s. What is its speed?
Answer and explanation
Correct answer: B. m/s
- Step 1: In one period the object covers the circumference .
- Step 2: m/s.
Answer
m/s.
Why not the others: m/s: the factor 2 in is forgotten. m/s: the period is multiplied instead of dividing. m/s: the radius is squared.
Practise more Mechanics.
Free questions with an explanation for every one, and full timed General Education Diploma (GED Oman) mock tests.
More Mechanics questions
- A stone is thrown horizontally at 5 m/s from a cliff 19.6 m high. Taking m/s, how far from the base of the cliff does it land?
- A 2 kg crate on a rough horizontal floor is pushed by a horizontal force of 40 N. The coefficient of kinetic friction is 0.25. Taking…
- A 5 kg crate on a rough horizontal floor is pushed by a horizontal force of 30 N. The coefficient of kinetic friction is 0.2. Taking…
- A 2 kg crate on a rough horizontal floor is pushed by a horizontal force of 30 N. The coefficient of kinetic friction is 0.3. Taking…
- A 4 kg crate on a rough horizontal floor is pushed by a horizontal force of 50 N. The coefficient of kinetic friction is 0.25. Taking…
- A 4 kg object moves in a horizontal circle of radius 0.5 m at a constant speed of 6 m/s. What is the centripetal force acting on it?