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aksik [14]
3 years ago
15

The Earth belongs to the group of rocky planets that orbits between the sun and the asteroid belt. Place these planets in order,

starting closest to the sun. A) Mercury-Earth-Venus-Mars B) Mercury-Venus-Earth-Mars C) Mercury-Venus-Earth-Saturn D) Venus-Mars-Earth-Jupiter
Physics
2 answers:
galina1969 [7]3 years ago
6 0

Answer:

B. Mercury-Venus-Earth-Mars

Explanation:

kari74 [83]3 years ago
3 0
B. Mercury-Venus-Earth-Mars
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A fruit bat falls from the roof of a cave. We know that her potential energy was
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Answer:

v = 15.65 m/s

Explanation:

We use conservation of mechanical energy between initial (i) and final (f) states:

Pi + KEi = Pf + KEf

At the top of the cave at the instant the bat starts to fall, there is only potential energy since the bat's velocity is zero.

Pi = m g h = 600 J

and the KEi = 0 J (no velocity)

Knowing the height of the cave's roof (12.8 m) , we can find the mass of the bat:

m = 600 J / (g 12.5) = 4.9 kg

Using conservation of mechanical energy, the final state is:

Pf + KEf = 600 J

with Pf = 0 (just touching the ground)

KEf= 1/2  4.9 (v^2)

and we solve for the velocity:

600 J = 0 + 1/2  4.9 (v^2)

v^2 = 600 * 2 / 4.9 = 244.9

v = 15.65 m/s

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How is acceleration calculated?
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