clonetrooper099
28.10.2020 •
Physics
Determine the required height h of the crest of the roller coaster to thebottom so that when it is essentially at rest at the crest of the hill it will reacha speed of 28 m/s when it comes to the bottom.
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Ответ:
h = 40 m
Explanation:
Assuming no friction present, total mechanical energy must be conserved, so the following expression stands:ΔK + ΔU = 0 (1)Now, if the car is at rest at the crest of the hill, the change in kinetic energy is just as follows:(2)
where vb = speed at the bottom = 28 m/s
If we define the bottom as our zero reference level for the gravitational potential energy, we can write the following equation:(3)
From (1) we get:ΔK = -ΔUReplacing by (2) and (3), we get:Ответ:
boston
Explanation:
because