The visible radiation produced by new stars within a molecular cloud get absorbed by dust grains and heats up the cloud
A molecular cloud is an interstellar cloud of gas and dust in which molecules can form, the most common of which is hydrogen .
The formation of stars occurs exclusively within molecular clouds because of their low temperatures and high densities, because the gravitational force acting to collapse the cloud must exceed the internal pressures that are acting "outward" to prevent a collapse.
Visible radiation are absorbed by dust grains and heats up the cloud as it cannot penetrate through the cloud instead get absorbed by the cloud . Newly formed stars are visible nearby, their images reddened by blue light which got scattered by the pervasive dust.
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a. subduction.
Explanation:
A subduction zone is a zone where the oceanic crust dives beneath the continental crust.
- Subduction zones are typical features of convergent margins where two plates pulls together.
- They are formed by continent-oceanic covergence and ocean - ocean covergence.
- In oceanic - continent convergence, the denser oceanic crust slides under the continental crust because it is denser than the mantle below.
- In oceanic - oceanic crust convergence, either of the plate slides under the other into the mantle.
- Trenches, volcanoes, earthquakes are typical geologic features associated with them.
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Here it is the use of vector and conservation of momentum !
so,
√(16^2+21^2) ×1000= 3000 v
v =8.8 m/s
so answer is B !
if you have any doubt, you can ask ! just comment !