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alukav5142 [94]
3 years ago
15

A space expedition discovers a planetary system consisting of a massive star and several spherical planets. The planets all have

the same uniform mass density. The orbit of each planet is circular.
In the observed planetary system, Planet A orbits the central star at the distance of 2R and takes T hours to complete one revolution around the star. Planet B orbits the central star at the distance of R. Which of the following expressions is correct for the number of hours it takes Planet B to complete one revolution around the star?

a. 1/â8T
b. 1/2T
c. 1/3â4T
d. 2T
e. â8T
Physics
1 answer:
Juliette [100K]3 years ago
7 0

Answer:

T/√8

Explanation:

From Kepler's law, T² ∝ R³ where T = period of planet and R = radius of planet.

For planet A, period = T and radius = 2R.

For planet B, period = T' and radius = R.

So, T²/R³ = k

So, T²/(2R)³ = T'²/R³

T'² = T²R³/(2R)³

T'² = T²/8

T' = T/√8

So, the number of hours it takes Planet B to complete one revolution around the star is T/√8

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<h2>Answer:</h2>

<em>Hello, </em>

<h3><u>QUESTION)</u></h3>

According to the second Newton's Law,

<em>✔ We have : F = m x a ⇔ m = F/a </em>

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The mass of the object is therefore 200 kg.

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Answer:

44.3 m/s

Explanation:

a) Draw a free body diagram of the mass M.  There are three forces:

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Sum of forces in the parallel direction:

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T − Mg sin 30° = 0

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Draw a free body diagram of the hanging mass m.  There are two forces:

Weight force mg pulling down,

and tension force T pulling up.

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∑F = ma

T − mg = 0

T = mg

Substitute:

mg = Mg / 2

m = M / 2

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b) Velocity of a standing wave in a string is:

v = √(T / μ)

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v = √(49 N / 0.025 kg/m)

v = 44.3 m/s

7 0
3 years ago
Which car is experiencing negative acceleration?
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Answer:B

Explanation:

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Can the velocity of a body revese the direction when acceleration is constant?
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Let volume of empty boat be = 100% = 1V

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In water 10%, 0.1V of the volume is submerged.

Mass, m of 1200kg increases the submerging from 10%, 0.1V to 70%, 0.7V

M leads to 0.1V boat submerging

boat submerging.

M + 1200kg leads to 0.7V boat submerging.

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By comparison

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The mass of the boat is 200kg.

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