Assuming no friction, how does the initial gravitational potential energy of

Physics

1 answer:

babymother [125]3 years ago

5 0

Answer:

a) They are the same.

Explanation:

Assuming no friction, there should be no energy transfer and thus the Law of Conservation of Energy says:

$PE=KE,\\mgh=\frac{1}{2}mv^2$

These types of problems also disregard any air resistance the surface of the object may cause. Therefore, no energy is transferred and from the Law of Conservation of Energy, $100\%$ of energy is preserved.

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A roller coaster starts from rest at point A. What is its speed at point C if the track is frictionless.

OleMash [197]

At A, coaster is only associated with potential energy.
At B, coaster is associated with kinetic as well as potential energy.
Since the track is frictionless, no energy will be lost when coaster reaches from point A to point B. Therefore, according to conservation of energy, total energy at A should be equal to total energy at B.
Total energy at A = mgh = mg(12)
Total energy at B = mgh+ mv²/2 = mg(2) + mv²/2
∴12mg = 2mg + mv²/2
∴(12g-2g)×2 = v²
∴v² = 20g
∴v = 14m/s.

Again conserving energy at points B and C.
Total energy at B = 2mg + m(14)²/2
Total energy at C = 4mg + mv²/2
∴2mg + m(14²)/2 = 4mg + mv²/2
Solving this you get,
v = 12.52 m/s.
Therefore, speed of roller coaster at point C is 12.52 m/s.

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4 years ago

How does an airplane engine work?

vivado [14]

Answer:

Explanation:

Un motor aeronáutico o motor de aviación es aquel que se utiliza para la propulsión de aeronaves mediante la generación de una fuerza de arrastre.

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eso depende de el motor que cada avion tenga

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3 years ago

A stone is dropped from rest from the top of a building. It takes Î”t = 2.2 s for it to reach the ground.

NeTakaya

Answer:

Value of magnitude of acceleration will be $9.8m/sec^2$