Answer: d) The atomic number decreases by 2
Explanation:
A particle alpha is He(2+)
Where we have:
A = 4
Z = 2
The atomic number, the number of protons, must be conserved:
At the beginning (before the emission) we have Z protons.
After the emission, we will have an element with an atomic number X , and an alpha particle with an atomic number = 2.
Then the total number of protons after the emission is X + 2.
The conservation equation is:
Z = X + 2
Isolating X we get:
X = Z - 2
Then after the emission, the atomic number is decreased by 2.
The correct option will be:
d) The atomic number decreases by 2
Answer:
Explanation:
moment of inertia of man
= mr² , m is mass of man and r is radius of table .
= 53 x 2.9²
=445.73
angular momentum of runner = mvr , v is velocity of runner .
53 x 3.6 x 2.9 = 553.32
angular momentum of turntable
= Iω , I is moment of inertia and ω is angular velocity of table .
= 76 x .2 = 15.2
Total angular momentum = 553.32 - 15.2
= 538.12
Let the common velocity when the runner comes to rest with respect to turntable be ω.
total moment of inertia of the system
= 445.73 + 76
= 521.73
Applying law of conservation of angular momentum
total initial angular momentum = final angular momentum
538.12 = 521.73 ω
ω = 1.03 rad /s .
A hot air balloon rises in the first place because the air inside is hot, which rises. So, if the air inside is not heated, it fails to rise and falls. Warm air rises because the particles get excited and jiggle with the heat, and cause the air to take up more space. So, as the surrounding air is probably colder and denser, the less dense hot air rises up in the hot air balloon.
Answer:
You didn't give the information needed for the answer bud
Explanation:
Answer:
Maybe A. waving your arms?