An object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.
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Answer:
myelin sheath
Explanation:
Myelin sheath are the protective tissue that helps in protecting the nerve cells of the human body. It plays an important role in transmitting the information from brain to the body and vice-versa. Healthy myelin sheath helps in better and quick transmission of nerve signals. It is highly resistant towards electrical resistance.
The distance between the orbits of two satellites is 7.97 m.
Explanation:
Johannes Kepler was the first to propose three laws for the planetary motion. According to him, the orbits in which planets are rotating are elliptical in nature and Sun is at the focus of the ellipse. Also the area of sweeping is same.
So based on these three assumptions, Kepler postulated three laws. One among them is Kepler's third law of planetary motion. According to the third law, the square of the time taken by a planet to cover a specified region is directly proportional to the cube of the major elliptical axis or the radius of the ellipse.
So,
Thus, for the geosynchornous satellite, as the time taken is 24 hours, then the radius or the major axis of this satellite is
Similarly, for the another satellite orbiting in time period of 12 hours, the major axis of this satellite is
So, the difference between the two radius will give the distance between the two orbits, 13.21-5.24 = 7.97 m.
So the distance between the orbits of two satellites is 7.97 m.
Answer:
b) The ball is a freely falling body for the duration of its flight.
Explanation:
When an object is thrown upwards, it moves against the direction of gravity. Its velocity decreases with respect to its motion, and zero at the maximum height. After which it falls back to the surface of the earth.
Since the ball moves initially against the force of gravity, its acceleration would be -9.8 m/ at its highest point. Thus since acceleration is constant, the ball is a freely falling body for the duration of its flight.
Answer:
The moon is 400x smaller but it's also 400x closer so it looks the same size even though it's not
Explanation: