If two objects collide and are stationary, what must the total momentum of the sum of the objects have been before collision?
1 answer:
Explanation:
Concept: In collision between two isolated bodies momentum is always conserved.
Also, if the collision is elastic kinetic energies are also conserved
m1v1i + m2v2i = m1v1f + m2v2f.
and in elastic collision
Momentum is preserved in collisions between two objects. The initial moment not being zero, the final momentum is not zero. This means both object has to be in motion.
However, it may be possible for one of the objects to be at rest after the collision. For instance, if the masses of the two objects are same, then after a head-on elastic collision the object initially at rest is moving and the object initially moving is at rest.
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<h2>Answer: 7020.117 m/s</h2>
Explanation:
The velocity of a satellite describing a circular orbit is<u> constant</u> and defined by the following expression:
(1)
Where:
is the gravity constant
the mass of the massive body around which the satellite is orbiting, in this case, the Earth
.
the radius of the orbit (measured from the center of the planet to the satellite).
This means the radius of the orbit is equal to <u>the sum</u> of the average radius of the Earth and the altitude of the satellite above the Earth's surface
.
Note this orbital speed, as well as orbital period, does not depend on the mass of the satellite. It depends on the mass of the massive body (the Earth).
Now, rewriting equation (1) with the known values: