A metal wire of resistance 48 ???? is cut into four equal pieces that are then connected side by side to make a new wire that is
1 answer:
Answer:
Explanation:
Resistance of wire, R = 48 ohm
It is cut into four pieces.
As we know that the resistance is directly proportional to the length of the wire.
So, the resistance of each piece of wire, R' = 48 / 4 = 12 ohm
Now the four pieces are connected in parallel. So the equivalent resistance is given by
Req = 3 ohm
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Answer:
a)
b)
Explanation:
Complete question statement is as follows :
A wooden block of mass M resting on a friction less, horizontal surface is attached to a rigid rod of length ℓ and of negligible mass. The rod is pivoted at the other end. A bullet of mass m traveling parallel to the horizontal surface and perpendicular to the rod with speed v hits the block and becomes embedded in it.
(a) What is the angular momentum of the bullet–block system about a vertical axis through the pivot? (Use any variable or symbol stated above as necessary.)
(b) What fraction of the original kinetic energy of the bullet is converted into internal energy in the system during the collision? (Use any variable or symbol stated above as necessary.)
a)
= mass of the bullet
= velocity of the bullet before collision
= distance of the line of motion of bullet from pivot =
= Angular momentum of the bullet-block system
Angular momentum of the bullet-block system is given as
b)
= final velocity of bullet block combination
Using conservation of momentum
Angular momentum of bullet block combination = Angular momentum of bullet
= Initial kinetic energy of the bullet
Initial kinetic energy of the bullet is given as
= Final kinetic energy of bullet block combination
Final kinetic energy of bullet block combination is given as
Fraction of original kinetic energylost is given as
Fraction =
Fraction =
Fraction =