Answer:
See the explanation below.
Explanation:
A)
He was trying to say that everything that exists on this planet is a product of the explosion of stars billions of years ago and that the elements that were originated by the high temperatures of such an explosion are present on our planet, the human beings have chemical elements within our bodies such as carbon, oxygen, and hydrogen, these same elements are found in stars in the different galaxies.
B)
I agree with what was explained by Carl Sagan, the stars are born as a result of the death of other stars when the stars are small, its death consists only in an increase in volume followed by a collapse where it is reduced in size, but the stars of a considerable size such as Aldebaran, Antares, and others, their fate will be different they will explode, such explosion will generate great energy that will form the chemical elements and clouds of great density, depending on the gravitational interactions, a new star will be formed the heavier elements that revolve around the new star will be compacted generating new planets, thus generating a new solar system, which can last billions of years to form.
The Kinetic Energy Formula is as follows: KE = mass x velocity^2 / 2
Plug in the correct numbers into the units!
KE = 4 kg x 16 m/s ^2 / 2
Square the 16 m/s.
KE = 4 kg x 256 m/s / 2
Multiply 4 x 256
KE = 1,024 / 2
Divide!
KE = 512 Newton-meters or Joules!!
Answer:
Explanation:
The law of conservation of angular momentum states that angular momentum remains constant when there is no external moment or forces applied to the system. Let assume that star can be modelled as an sphere, then:
The final angular speed is:
Answer:
the tension in the part of the cord attached to the textbook is 7.4989 N
Explanation:
Given the data in the question;
As illustrated in the image below;
first we determine the value of the acceleration,
along vertical direction; we use the second equation of motion;
y = ut + at²
we substitute;
0 m/s for u, 1.29 m for y, 0.850 s for t,
1.29 = 0×0.850 + ×a×(0.850)²
1.29 = 0.36125a
a = 1.29 / 0.36125
a = 3.5709 m/s²
Now when the text book is moving with acceleration , the dynamic equation will be;
T₁ = m₁a
where m₁ is the mass of the text book ( 2.10 kg )
a is the vertical acceleration ( 3.5709 m/s² )
so we substitute
T₁ = 2.10 × 3.5709
T₁ = 7.4989 N
Therefore, the tension in the part of the cord attached to the textbook is 7.4989 N