<span>Plate tectonics is the theory that the earth's crust is broken up into plates
that float on top of a hotter and more fluid layer below. Evidence to
support this theory has been uncovered through the study of the earth's
past magnetic field, known as paleomagnetism.</span>
Answer:
The dust present in the clouds.
Explanation:
The complicated composition molecules that can be found in space are generally associated with clouds of dust. The significant amount of dust in these clouds provides protection not only for these molecules, but for any body that makes up or is associated with dust clouds.
It is exactly this dust that protects the molecules against the action of ultraviolet rays.
Answer:
Explanation:
Rydberg's formula is used to describe the wavelengths of the spectral lines of chemical elements similar to hydrogen, that is, with only one electron being affected by the effective nuclear charge. In this formula we can find the rydberg constant, knowing the wavelength emitted in the transcision between two energy states, we can have a value of the constant.
Where it is the wavelength of the light emitted, R is the Rydberg constant, Z is the atomic number of the element and are the states where .
In this case we have Z=1 for hydrogen, solving for R:
This value is quite close to the theoretical value of the constant
Answer:
a) = 72.75 kg
, b) V = 0.07275 m³
, c) ρ₂ = 1030.9 km / m³
, d) ρ₂= 996 kg / m³ float
Explanation:
This is an exercise that we must solve using the Archimedes principle, where the thrust is
B = ρ g V
a) Let's use Newton's second law
F = B - W
F = ρ g V - mg
The force is the apparent weight (m₂ = 2.25 kg) is directed downwards so it is negative
F = m₂ g
-m₂ g = ρ g V - m g
-m₂ g = g - mg
= -m₂ + m
= -2.25 + 75.0
= 72.75 kg
b) let's use the definition of density
ρ = m / V
V = m /ρ
V = 72.75 / 1000
V = 0.07275 m³
c) the density of man is
ρ₂ = m / V
ρ₂ = 75.0 / 0.07275
ρ₂ = 1030.9 km / m³
d) the volume of man increases because the lungs are full of air, as they are half full, with a capacity of 2.5 liters and two lungs the volume is
V’= ½ 2.5 2
V’= 2.5 liters
V’= 2.5 10⁻³ m³
The total volume of man is
Vt = 0.07275 + 0.0025
Vt = 0.07525
Let's calculate the density
ρ₂ = 75.0 / 0.07525
ρ₂= 996 kg / m³
As this is less than the density of water (1000 kg / m3) man must float
I have concluded that the formula for this equation would be F = ma, therefore the equation would look like this:
F = ma
F = 4,200n/ 2,000 kg
= 2.1
The rate of acceleration is 2.1, hopefully I this will be of assistance to you. :)