Answer:
i don't really know the exact answer but i would say something like earthquakes or steam/excessive heat
Explanation:
The vertical components of velocity is 10.35 m/s and the horizontal component of velocity is 38.6 m/s
<h3>What are the components of velocity?</h3>
We know that velocity is a vector quantity, a vector often can be resolved into its components. The vertical components is V sinθ while the horizontal component is vcosθ.
Hence;
Vertical component = 40 m/s sin 15 degrees = 10.35 m/s
Horizontal component = 40 cos 15 degrees = 38.6 m/s
Learn more about components of velocity:brainly.com/question/14478315
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The correct answer to the question is - A). Light waves can travel in a vacuum and travel at a constant speed even if the light source is moving.
EXPLANATION:
Before going to answer this question, first we have to understand the fundamental postulate of quantum mechanics.
As per the fundamental postulate of quantum mechanics, the speed of light is always constant irrespective of the nature of frame of reference i.e speed of light is same both in inertial and non-inertial frame of reference. It is independent of the velocity of source also.
Again we know that light is an electromagnetic wave. Hence, it won't require any medium for its propagation. It can travel in space or vacuum also.
Hence, the correct option out of four options is that light waves can travel in a vacuum and travel at a constant speed even if the light source is moving.
The magnitude of the change in momentum of the block is 0.8 kg m/s.
<h3>
Change in momentum</h3>
A change in momentum is the different between the final momentum and the initial momentum of the object.
The magnitude of the change in momentum of the block between zero and 4.0 seconds is calculated as follows;
where;
- Vf is the final velocity at 4 seconds = ?
- Vo is the initial velocity at 0 seconds = 0
From the graph the velocity at 4 seconds is calculated as;
ΔP = 2(0.4 - 0)
ΔP = 0.8 kg m/s
Thus, the magnitude of the change in momentum of the block is 0.8 kg m/s.
Learn more about change in momentum here: brainly.com/question/7538238