Explanation:
It is given that, a solid metal sphere of diameter D is spinning in a gravity-free region of space with an angular velocity of ω.The sphere is slowly heated until it reaches its melting temperature, at which point it flattens into a uniform disk of thickness D/2.
The angular momentum remains conserved in this case. The relation between the angular momentum and the angular velocity is given by :
Where
are moment of inertia of sphere and the disk respectively
Here, volume before = volume after
Initial angular momentum,
..........(1)
Final angular momentum,
............(2)
From equation (1) and (2) :
Hence, this is the required solution.
Answer:
A. Inertial Confinement and B. Magnetic Confinement
Answer:
Explanation:
We are asked to find the force being applied to a book. According to Newton's Second Law of Motion, force is the product of mass and acceleration.
The mass of the book is 0.75 kilograms and the acceleration is 0.3 meters per square second. Substitute these values into the formula.
Multiply.
1 kilogram meter per second squared is equal to 1 Newton. Therefore, our answer of 0.225 kilogram meters per second squared is equal to 0.225 Newtons.
<u>0.225 Newtons of force</u> are applied to the book.
Answer:
B. Hydrogen
Explanation:
Hydrogen reacts with the water molecules by giving a proton to them.
In (A. Dalton's) atomic model, negative electrons orbit the positively charged nucleus.
