Answer:
5026.55 m/s
Explanation:
Gravitation potential of a body in orbit from the center of the earth is given as
Pg = -GM/R
Where G is the gravitational constant 6.67x10^-11 N-m^2kg^-2
M is the mass of the earth = 5.98x10^24 kg
R is the distance from that point to the center of the earth = r + Re
r is the distance above earth surface, Re is the earth's radius.
R = 1610 km + 6370 km = 7980 km
Pg = -(6.67x10^-11 x 5.98x10^24)/7980x10^3
Pg = -49983208.02 J/kg
The negative sign means that the gravitational potential is higher away from earth than it is at the earth's surface (it shows convention).
This indicates the kinetic energy per kilogram that the chest of jewel will fall with to earth.
Gravitation Potential on earth's surface is
Pg = -GM/Re
= -(6.67x10^-11 x 5.98x10^24)/6370x10^3 = -62616326.53 J/kg
Difference in gravity potential = -49983208.02 - (-62616326.53)
= 12633118.51 J/kg
The velocity V of the jewel chest will be
0.5v^2 = 12633118.51
V^2 = 25266237.02
V = 5026.55 m/s
Answer:
The two factors that increase the size of a population are natality, which is the number of individuals that are added to the population over a period of time due to reproduction, and immigration, which is the migration of an individual into a place.
Explanation:
Thus, astronomers can<span> identify what kinds of stuff are in </span>stars<span> from the lines they find in the </span>star's spectrum<span>. This type of study is called spectroscopy. The science of spectroscopy is quite sophisticated. ... The spectral line also </span>can tell<span> us about any magnetic field of the </span>star<span>.</span>
Answer:
J
Explanation:
Parameters given:
We know that the electron fell from level 4 to level 1. We can use the Rydberg's equation to find the that is emitted by the electron in the process. Rydberg's equation is given as:
1/λ =
where R = Rydberg's constant =
1/λ =
1/λ =
1/λ =
1/λ =
∴ λ = m
Energy of the photon is given by:
E = (hc)/λ
where
h = Planck's constant =
c = speed of light = 299792458 m / s
∴ E =
E = J
The energy of the photon is J
Answer:
today's species evolved from those of the past.
Explanation:
By comparing fossils of a specie from long ago to those of today, we can conclude that today's species evolved from those of the past.
- Fossils are the preserved remains of ancient life forms found within sedimentary bed layers.
- These fossils helps scientists to understand ancient life forms.
- According to the discovery of Charles Darwin, organisms have evolved and are still evolving.
- Understanding past life forms gives a way to characterize present day species better.