Answer:Explanation:
A microscopic hair examination can also determine if a hair was forcibly removed, artificially treated or diseased. A comparison microscope can be used to compare a questioned hair to a known hair sample in order to determine if the hairs are similar and if they could have come from a common source.
Answer: The mass of 0.5 mole of element ab is 81.67 g.
Explanation:
According to the mole concept, 1 mole of a substance contains . As, the mass of atoms is 0.49 g.
So,
Therefore, mass of 1 mole =
= 163.33 g/mol
Hence, mass of 0.5 mole of ab element is calculated as follows.
= 81.67 g
Therefore, the mass of 0.5 mole of element ab is 81.67 g.
Answer: Both masses are 0.285 m apart
Explanation:
According to the law of Universal Gravitation:
Where:
is the gravitational force between the masses
is the gravitational constant
is the mass of the first object
is the mass of the second object
is the distance between the objects
Isolating :
This is the distance between both objects
For this problem, we use the decay equation which is expressed as:
An = (Ao)e^-kt
where An is the amount left in t time, Ao is the initial amount and k is a constant.
We first calculate the value of k as follows:
An = (Ao)e^-kt
0.5 = e^-k(8)
k = 0.087
We calculate the time as follows:
An = (Ao)e^-kt
15.625 = 250e^-0.087t
t = 31.87 days