Answer:
I am kind of confused-
Explanation:
Do you mind re-writing and explaining the question more?
''Surface waves<span> are neither longitudinal nor </span>transverse<span>. In longitudinal and </span>transverse waves<span>, all the particles in the entire bulk of the medium move in a parallel and a perpendicular direction (respectively) relative to the direction of </span>energy<span> transport. ... Any </span>wave<span> moving through a medium has a source.''</span>
A.) <span>If no unbalanced force acts upon the house of cards, then it will remain standing forever.
[ Other Statements doesn't make any sense in Physics, they can be true in some situation & can't be false, option A is the only answer ]
Hope this helps!</span>
Viscous force is the force that pushes against something travelling through a fluid. Viscous force is an analogue in fluids(liquids or gases) of the force of friction. It acts opposite to the direction in which the object is moving relative to the fluid.