A body of mass m moves in a circle of radius r with constant angular velocity ω about a point. What is Its angular momentum about this point?
Correct answer: C. mr2 ω
- A. m ω
- B. mr ω
- C. mr2 ω
- D. mr ω2
Explanation
When a body moves in a circle with constant angular velocity, its angular momentum about a point can be calculated using the formula L=Iω, where L is the angular momentum, I is the moment of inertia, and ω is the angular velocity. For a body of mass m moving in a circle of radius r, the moment of inertia I=mr2. Therefore, the correct angular momentum is mr2ω. Options A, B, and D are incorrect because they either omit or incorrectly calculate the moment of inertia in the angular momentum formula.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
Practise Force and Motion
1,416 free Force and 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 Force and Motion questions
A car moves with a uniform speed of 2 m/s in a circle of radius 0.4 m. Its angular speed in rad/sec is:
A stone is whirled in a vertical circle at the end of a string. When the stone is at the highest position, the tension in the string is:
The acceleration of a body undergoing uniform circular motion is constant in:
If a body of mass m is moving with constant speed v (also called tangential velocity) in a circular path of radius r, its tangential acceleration is:
Which of the following statements is correct for a particle moving in a horizontal circle with constant angular velocity?
A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 0.1 rad. What is the radius of the wheel?