The mechanical energy of an object is equivalent to the sum of its potential and kinetic energy. If the helicopter is grounded, then its mechanical energy will be 20 J. If it is in the air, then its potential energy will be calculated using:P.E = mghAnd then added to the kinetic energy to obtain mechanical energy.
(C),Minerals
Minerals take thousand to millions of years to replace themselves therefore they are no renewable
Answer:
D. Running water is acting as a destructive force as it weathers and erodes rock.
Explanation:
Because the rock is breaking, the running water is acting as a destructive force.
I also had this question. Hope this helps! :)
Major shifts, that is shifts in the paradigms, are not very frequent - they would make scientific research unstable, as any result of a smaller study could be made invalid by a paradigm shift,
minor changes however are quite common - basically every scientific study adds to the common knowledge and this also can be considered a minor change.
Therefore the best answer is
<span>Major
shifts in scientific views very rarely occur, but minor modifications
of prior knowledge are continually made based on new research.</span>
