Answer:
the decay of half of the nuclei only a half-life has passed
, b) in rock time it is 1 108 years
Explanation:
The radioactive decay is given by
N = N₀
If half of the atoms have decayed
½ N₀ = N₀
½ =
₀
Ln 0.5 = - λ t
t = - ln 0.5 /λ
The definition of average life time is
= ln 2 / λ
λ = ln 2 / 
λ = 0.693 / 100 10⁶
λ = 0.693 10⁻⁸ years
We replace
t = -ln 0.5 / 0.693 10⁻⁸
t = 10⁸ years
We see that for the decay of half of the nuclei only a half-life has passed
b) in rock time it is 1 108 years
Answer:
The centripetal force is provided by the x component of the Normal Force.
Explanation:
The centripetal force is a force that makes something to follow a cicular trayectory, this force is always oriented to the center of the circunferency-
So you can see in the image that i attached there is only two forces actting on the car, the normal force and the weigth, and as you can see the y component of the normal force cancels with the weigth, but the x component of the normal force (as it has nothing to cancel with) makes the car follow the circular trayectory so this is the centripetal force.
<span>An influx of warm, moist air into the tornado's parent thunderstorm may cause the tornado to intensify or entering a valley.</span>
Answer:
4500
Explanation:
from the question,
m=30
h=15
g=10(constant)
using the formula P. E = mgh
therefore, P. E = 30×10×15 =4500
therefore the potential energy of the child is 4500