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Eduardwww [97]
3 years ago
8

following statement supports which theory? "Astronomers have observed protoplanetary disks around distant newborn stars." Big Ba

ng theory Nebular theory Cell theory String theory
Physics
2 answers:
Ad libitum [116K]3 years ago
8 0

Answer:

nebular theory

Explanation:

Irina-Kira [14]3 years ago
5 0

Answer: B

Nebula theory

Explanation:

Nebular Theory: This states that the solar system developed out of an interstellar cloud of dust and gas, called a nebula. If astronomers have observed protoplanetary disks around distant newborn stars, the Sun-to-be collected most of the mass in the nebula's center, forming a Protostar

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What happens to the density of a fluid as the substance gains thernal energy
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Density reduces

Explanation:

The density of a fluid will reduce as a substance gains more thermal energy. Heat is a form of thermal energy usually noticed as temperature differences in a matter.

  • When thermal energy is gained by a body, the temperature of the body rises.
  • The particles of the medium gains more kinetic energy.
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3 years ago
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Answer:

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Explanation:

4 0
3 years ago
Which of the following describes the efficiency of real machines?
Leokris [45]
Choice-B is the true one.
3 0
3 years ago
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A ball of mass 5 kg attached to a string is swung in a horizontal circle of radius 0.5 m. If the tension in the string is 10 N,
kirill115 [55]

Answer:

0 J

Explanation:

given,

mass of the ball = 5 kg

radius of the horizontal circle = 0.5 m

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Work done = ?

Work done by the tension in the circular path will be equal to zero.

This is because body moves in circular path, the centripetal force act along the radius of the circle and motion is right angle to the tension on the string.

so, work done = F s cos θ

     θ = 90°,

work done = F s cos 90°        ∵ cos 90° = 0

Work done = 0 J

8 0
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tensa zangetsu [6.8K]

Answer:

Explanation:

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3 years ago
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