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blondinia [14]
4 years ago
7

***PLEASE HELP*** (you don’t have to answer all but at least 1 or 2 answers would help!!!)

Physics
1 answer:
Reptile [31]4 years ago
8 0

Answer:

1. B. Contract

2. C. In dark matter and dark energy

3. A. In denser regions with little space between atoms

Explanation:

1. We know that the galaxy consists of a cluster of stars with their respective planets rotating around the center of the Galaxy, i.e. a galaxy is a formation of millions or billions of stars depending on its size. In the center of each galaxy is a black hole, this black hole will absorb all kinds of matter and in turn energy. black holes are the densest objects in the universe and no one escapes their gravity. And finally every star in the Galaxy will be absorbed by the black hole.

2. The most logical explanation to this question is that baryonic matter is the conformation of dark matter and dark energy. Everything that relates energy and dark matter can be grouped as baryonic matter.

3. After the explosion of a star originates the birth of a new one, with new planets, before the new conformation the explosion generates clouds of gas very dense, which are near the site of the explosion, this way, the material more dense contracts forming a new star, the remaining material of the dense gas clouds are grouped if you do not have the enough energy and with other requirements to form rocky planets and the clouds less dense than they were in the outside part of the bang form the gas planets. Therefore always in each group of planets, the closest to the star will be solid planets while the Outer Ones will be gaseous planets.

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The mechanical advantage of a machine is the ratio of the force produced by the machine to the force applied to it. Therefore, we may calculate the applied force using:
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4 years ago
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7.2
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Answer:

The kinetic molecular theory of matter asserts that: Matter is made up of particles that are continually moving. All particles contain energy, however the energy fluctuates depending on the temperature the sample of matter is in. This in turn decides whether the material exists in the solid, liquid, or gaseous form.

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3 years ago
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A student on a skateboard is moving at a speed of 1.40 m/s at the start of a 2.15 m high and 12.4 m long incline. The total mass
saw5 [17]

Answer:

W = 609.97J

Explanation:

In order to calculate the work done by the student, you take into account that the total work is equal to the change of the kinetic energy of the student, as follow:

W_T=\Delta K\\\\W+W_g-W_f=\frac{1}{2}m(v^2-v_o^2)\\\\W+Mgsin\alpha d-F_fd=\frac{1}{2}m(v^2-v_o^2)         (1)

The work done by the friction force is negative because it is against the motion of the student.

W: work done by the student = ?

Wf: work done by the friction force

Wg: work done by the gravitational force

Ff: total friction force = 41.0N

m: mass of the skateboard = 53.0kg

d: distance traveled by the student

v: final speed of the student = 6.90m/s

vo: initial speed of the student = 1.40m/s

α: angle of the incline

You first calculate the distance d, with the Pythagoras' theorem

d=\sqrt{(2.15m)^2+(12.4m)^2}=12.58m

Furthermore, the angle α is:

\alpha=tan^{-1}(\frac{2.15m}{12.4m})=9.83\°

Then, you solve the equation (1) for W and replace the values of all parameters:

W=\frac{1}{2}m(v^2-v_o^2)+F_fd-Mgsin\alpha d\\\\W=\frac{1}{2}(53.0kg)((6.90m/s)^2-(1.40m/s)^2)+(41.0N)(12.58m)\\-(53.0kg)(9.8m/s^2)sin(9.83\°)(12.58m)\\\\W=609.97J

The work done by the student is 609.97J

6 0
4 years ago
a moving ball rolls into a stationary ball. the total momentum of both balls after the collision will be
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The momentum of the rolling ball will have less momentum than before the collision and the stationary ball will have more momentum after the collusion.
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The SI units of mass density are kg/m3, but there are several other common units. One of the most commonly used units of mass de
gulaghasi [49]

Answer:

Explanation:

Given

mass of object m=59\ gm

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Therefore Buoyant force F_b=\rho \times V_d\times g

where \rho =Density\ of\ water(1000\ kg/m^3)

g=acceleration due to gravity

substituting values

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F_b=8.109\ N                                                                    

3 0
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