Does using oxygen to separate molten
1 answer:
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Answer:
(a) 28690 m/s (b)
Explanation:
The orbital speed is define as:
(1)
Where r is the radius of the trajectory and T is the orbital period.
To determine the orbital speed of the Earth it is necessary to know the orbital period and the radius of the trajectory. That can be done by means of the Kepler's third law and average velocity equation.
The average velocity in a Uniform Rectilinear Motion is defined as:
(2)
Where v is the velocity, d is the covered distance and t is the time.
Equation 2 can be rewritten for d to get:
(3)
In this case, v will be the speed of light and t, the 8 minutes that takes to reach the Earth.
The time will be converted to seconds so the units in equation 3 can match:
⇒
Replacing all those values in equation 3 it is gotten:
Kepler’s third law is defined as:
Where T is orbital period and r is the radius of the trajectory.
It is necessary to pass from meters to astronomical unit (AU), 1 AU is defined as the distance between the Earth and the Sun.
That can be expressed in units of years.
But there are 31536000 seconds in one year:
Finally, equation 1 can be used:
<u>So Earth orbital speed around the Sun is 28690 m/s.</u>
<em>b) What is its kinetic energy?</em>
The kinetic energy is defined as:
(4)
Notice that it is necessary to found the mass of the Earth, that can be done combining the Universal law of gravity and Newton's second law:
(5)
M will be isolated in equation 5:
Where r is the radius of the Earth ()
<u>Hence, the kinetic energy of Earth is .</u>
Answer:
<em>The mass of the object is 40 Kg</em>
Explanation:
<u>Net Force</u>
According to the second Newton's law, the net force exerted by an external agent on an object is:
F = m.a
Where:
a = acceleration of the object.
m = mass of the object.
The mass can be calculated by solving for m:
The object has a net force of F=600 N acting on it and travels at , thus the mas is:
m = 40 Kg
The mass of the object is 40 Kg
Answer:
Options d and e
Explanation:
The pendulum which will be set in motion are those which their natural frequency is equal to the frequency of oscillation of the beam.
We can get the length of the pendulums likely to oscillate with the formula;
where g=9.8m/s
ω= 2rad/s to 4rad/sec
when ω= 2rad/sec
L = 2.45m
when ω= 4rad/sec
L = 9.8/16
L=0.6125m
L is between 0.6125m and 2.45m.
This means only pendulum lengths in this range will oscillate.Therefore pendulums with length 0.8m and 1.2m will be strongly set in motion.
Have a great day ahead