The right answer to this question is A. a crest that is toppling over. When a surfer rides an ocean wave on her surfboard, she is actually riding on a crest. The crest is the point on a wave with the maximum value or upward displacement within a cycle.
I don't no if this helps but the body heat from your hand causes the liquid to boil, which in turn makes the liquid evaporate, turning it to gas. The expanding gas pushes the liquid upwards and when you release your hand, equilibrium is re-established.
Answer:
5 is the tripoid stand
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The medulla in the brain controls the breathing rate in the lungs
The net force on an object subject to friction is equal to the sum of the applied force and the frictional force.
Mathematically,
Here, m is mass of object and a is its acceleration. We take frictional force negative because it opposes the motion of object.
Given, 
, 
and 
Substituting these values in above formula, we get
.
Thus, the acceleration of an object is 
