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Question 1:

What is uniform circular motion?

A) Circular motion at a constant speed
B) Circular motion with a changing speed
C) Circular motion with a changing radius
D) Circular motion with a changing direction

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Explanation: The correct answer is A) Circular motion at a constant speed. Uniform circular motion refers to an object moving in a circular path with a constant speed. Although the speed remains constant, the direction of the object's velocity changes continuously.

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Question 2:

What is the direction of the tangential velocity vector in uniform circular motion?

A) Tangential to the circular path
B) Radial away from the center
C) Radial towards the center
D) Perpendicular to the circular path

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Explanation: The correct answer is A) Tangential to the circular path. The tangential velocity vector is always tangent to the circular path at any point. It represents the direction and magnitude of the object's velocity in uniform circular motion.

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Question 3:

Which of the following quantities remains constant in uniform circular motion?

A) Speed
B) Velocity
C) Acceleration
D) Radius

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Explanation: The correct answer is A) Speed. In uniform circular motion, the speed of the object remains constant. However, the velocity, which includes both speed and direction, changes continuously as the object moves around the circle.

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Question 4:

What is the relationship between the tangential velocity and the radius of the circular path in uniform circular motion?

A) They are directly proportional
B) They are inversely proportional
C) There is no relationship between them
D) The relationship depends on the mass of the object

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Explanation: The correct answer is B) They are inversely proportional. In uniform circular motion, the tangential velocity and the radius of the circular path are inversely proportional to each other. A larger radius results in a smaller tangential velocity, while a smaller radius results in a larger tangential velocity.

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Question 5:

What is the direction of the centripetal acceleration vector in uniform circular motion?

A) Tangential to the circular path
B) Radial away from the center
C) Radial towards the center
D) Perpendicular to the circular path

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Explanation: The correct answer is C) Radial towards the center. The centripetal acceleration vector is always directed towards the center of the circular path. It is responsible for continuously changing the direction of the object's velocity, keeping it on the circular trajectory.