No spacecraft has been built yet that was able to absorb harmful
radiations in space, change weather conditions on Earth, or destroy
meteors and comets which might strike Earth.
We should continue to send robotic spacecrafts into space
because they help discard some myths about objects in space.
In other words, they help us learn things that we never knew before.
Answer:
4374 km/h
Explanation:
The momentum of the 1500 kg object is given by:
where
m = 1500 kg is the mass
v = 1.62 m/s is the velocity
Substituting,
We know that the smaller object of mass m' = 2 kg has the same momentum, so we can find its velocity by re-arranging the same equation:
Now to convert into km/h, keep in mind that:
1 km = 1000 m
1 h = 3600 s
So, we find
It is incorrect to say heavy objects sink in water because based on the density of the water it can actually cause the "heavy object" to float, out weighing it.