The rope is strung around a pulley of radius 40 cm and mass 3.0 kg. The block is let go from rest. How fast is it moving when it has dropped by 20 cm?
Rigid Body
A rigid body is an object which does not change its shape or undergo any significant deformation due to an external force or movement. Mathematically speaking, the distance between any two points inside the body doesn't change in any situation.
Rigid Body Dynamics
Rigid bodies are defined as inelastic shapes with negligible deformation, giving them an unchanging center of mass. It is also generally assumed that the mass of a rigid body is uniformly distributed. This property of rigid bodies comes in handy when we deal with concepts like momentum, angular momentum, force and torque. The study of these properties – viz., force, torque, momentum, and angular momentum – of a rigid body, is collectively known as rigid body dynamics (RBD).
Question 3
![3. The rope is strung around a pulley of radius
40 cm and mass 3.0 kg. The block is let go
from rest. How fast is it moving when it has
dropped by 20 cm?
4. A box slides down a ramp that makes a 20°
angle with the ground To keep the box
moving at a constant speed, Fred pushes
back on it with a 68 N horizontal force. How
much work does Fred do on the box as it
slides 3.5 m down the ramp?
1.5 kg](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fabf2f152-89f0-4046-91ff-b1dc5b87079f%2Fed6e6b26-3311-448c-bdf2-51a0335e348c%2F8dncyx_processed.jpeg&w=3840&q=75)
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