Answer:
(a) 
(b) 
Explanation:
Given data
The angular velocity of two cylinders ω=257 rad/s
The mass of the two cylinders m=2.88 kg
The radius of small cylinder r₁=0.319 m
The radius of larger cylinder r₂=0.605 m
For Part (a)
The rotational kinetic energy of the cylinder is given by:

Where I is rotational of inertia of solid cylinder about its central axis.
So

Substitute the given values
So

For Part (b)

Substitute the given values

Answer:
The initial speed of bullet is "164 m/s".
Explanation:
The given values are:
mass of bullet,

or,

mass of wooden block,

speed,

Coefficient of kinetic friction,

As we know,
The Kinematic equation is:
⇒ 
then,
Initial velocity will be:
⇒ 

On substituting the given values, we get
⇒ 


As we know,
The conservation of momentum is:
⇒ 
or,
⇒ Initial speed, 
On substituting the values, we get
⇒ 
⇒ 
⇒
The light coming out of a concave lens will never meet.
So, the answer is A. will never meet.
Happy Studying! ^^
Your answer is 632,100J which is Choice D
Metals are giant structures of atoms held together by metallic bonds. “Giant” implies that large but variable numbers of Atoms are involved - depending on the size of the bits of metal. most metals are close packed - that is, they fit as many items as possible into the available volume.