The Earth-centered model of the Solar System contains____planets.

Physics

2 answers:

Liula [17]4 years ago

8 0

Answer:

Explanation:

the geocentric and heliocentric models of the solar system contained the movements of the Sun, the Moon, and the five known planets. Which were Mercury, Venus, Mars, Jupiter, and Saturn.

andreyandreev [35.5K]4 years ago

5 0

Explanation:

The Solar System is the gravitation bound system.
In this system sun is the head of family along with many kids named as planets the largest are the eight planets and the remainder kids named as dwarf planets and small Solar System bodies.
The Solar System formed about 4.6 billion years back from the gravitational collapse of a giant interstellar molecular cloud.
The majority of the system's mass is enclosed by the Sun, with the majority of the remaining mass occupied by Jupiter.

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Ratling [72]

Answer:

D) momentum of cannon + momentum of projectile= 0

Explanation:

The law of conservation of momentum states that the total momentum of an isolated system is constant.

In this case, the system cannon+projectile can be considered as isolated, because no external forces act on it (in fact, the surface is frictionless, so there is no friction acting on the cannon). Therefore, the total momentum of the two objects (cannon+projectile) must be equal before and after the firing:

$p_i = p_f$

But the initial momentum is zero, because at the beginning both the cannon and the projectile are at rest:

$p_i = 0$

So the final momentum, which is sum of the momentum of the cannon and of the projectile, must also be zero:

$p_f = p_{cannon}+p_{projectile} =0$

6 0

4 years ago

You are traveling along a freeway at 65 mi/h. You suddenly skid to a stop because of congestion in traffic. Where is the energy

sergey [27]

The work and energy theorem allows finding the result for where the kinetic energy of the car is before stopping is:

The energy becomes:

An important part in work on discs.

A part in non-conservative work due to friction.

Work is defined by the scalar product of force and displacement.

W = F . d

Where the bold indicate vectors, W is work, F is force and d is displacement.

The work energy theorem relates work and kinetic energy.

W = ΔK = $K_f - K_o$

In this case the vehicle stops therefore its final kinetic energy is zero, consequently the work is:

W = - K₀

Therefore, the initial kinetic energy that the car has is converted into work in its brakes. In reality, if assuming that there is friction, an important part is transformed into non-conservative work of the friction force, this work can be seen in a significant increase in the temperature of the discs on which the work is carried out.