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3 years ago

Which of the following describes a major role of gravity in star formation?

Physics

2 answers:

artcher [175]3 years ago

8 0

Answer:

B. Gravity compresses gases at the center of a solar nebula until temperatures are high enough for nuclear fusion to occur.

Explanation:

Stars are born in stellar nurseries known as nebula. Sun, the star at the center of the solar system was born in the solar nebula.

Nebula is a molecular cloud of dust and gases. Due to gravity, this cloud collapses under its own weight and condenses to form the core. It gathers more mass till the temperature of the core rises enough to start the nuclear fusion reaction. A star is born then.

MrRissso [65]3 years ago

7 0

The ans is B) because gravity attracts and doesn't repel

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A wooden block with mass 1.60 kg is placed against a compressed spring at the bottom of a slope inclined at an angle of 30.0° (p

andreyandreev [35.5K]

Answer:

The amount of potential energy that was initially stored in the spring is 88.8 J.

Explanation:

Given that,

Mass of block = 1.60 kg

Angle = 30.0°

Distance = 6.55 m

Speed = 7.50 m/s

Coefficient of kinetic friction = 0.50

We need to calculate the amount of potential energy

Using formula of conservation of energy between point A and B

$U_{A}+k_{A}+w_{A}=U_{B}+k_{B}$

$U_{A}+0-fd=mgy+\dfrac{1}{2}mv^2$

$U_{A}=\mu mg\cos\theta\times d+mg h\sin\theta+\dfrac{1}{2}mv^2$

Put the value into the formula

$U_{A}=0.50\times1.60\times9.8\cos30\times6.55+1.60\times9.8\times6.55\sin30+\dfrac{1}{2}\times1.60\times(7.50)^2$

$U_{A}=88.8\ J$

Hence, The amount of potential energy that was initially stored in the spring is 88.8 J.

7 0

2 years ago

What are the 3 Newton's law of motions?

irinina [24]

Answer:

laws of motion relate an object’s motion to the forces acting on it. In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

4 0

2 years ago

Help me please!

MrMuchimi

I think it’s A
Good luck

6 0

2 years ago

Cartilage is present in the joints of our body, which helps in their smooth

Elden [556K]

It would result in stiffness and pain. Additional stress would be put onto the joints as well. Hope this helps, cheers!

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2 years ago