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3 years ago

No physical processes have ever been demonstrated which provide a mechanism for the universe to assemble itself.

2 answers:

8 0

There are some very plausible hypotheses in modern Cosmology that use
well-known and long-proven Physics and Math to explain the evolution of the
universe, and account very nicely for the items and structures that we see all
around us in every direction.

The hypotheses have not been demonstrated, because it's really hard to
set up an experiment in the lab, and then wait several billion years for the
interstellar nebula to condense into a star and planets and life to form on
the planets.

So to answer the question, it's true that the processes have not been
demonstrated. But it's false that no plausible hypotheses exist that explain
the evolution of the modern universe, and that correspond nicely with what
we're able to observe of the structure of the universe today.

denis23 [38]3 years ago

7 0

Look into the big bang theory not sure if it is considered to be demonstrated but it is a popular scientific theory

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3 years ago

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If the gravitational forces exist between all objects in the universe why aren't people affected by the gravitational force exer

Rama09 [41]

Answer: People are not affected by the gravitational force of cars and buildings because their masses are too small to exert a strong enough force for people to feel.

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3 years ago

Our understanding of the atom has changed over time. Which idea that was once accepted is now considered scientifically inaccu

liubo4ka [24]

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3 years ago

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The center of mass of a 0.30-kg (non-uniform) meter stick is located at its 45-cm mark. What is the magnitude of the torque (in

lbvjy [14]

Answer:

The magnitude of the torque due to gravity if it is supported at the 28-cm mark is 0.5 N-m.

Explanation:

Given that,

Mass of the meter stick, m = 0.3 kg

Center of mass is located at its 45 cm mark.

We need to find the magnitude of the torque due to gravity if it is supported at the 28-cm mark. Torque acting on the object is given by :

$\tau=r\times F\\\\\tau=(45-28)\times 10^{-2}\times 0.3\times 9.79\\\\\tau=0.499\ N-m$

$\tau=0.5\ N-m$

So, the magnitude of the torque due to gravity if it is supported at the 28-cm mark is 0.5 N-m.

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3 years ago

A construction crane lowers a beam into place at constant speed. Consider the work Wg done by gravity on the beam and the work W

aalyn [17]

Answer:

Wg is positive and WT negative.

(Letters in options are all wrongly written).

Explanation:

Remember that the work of a force is the internal product between the force and the displacement $W=F.d$ .

Since the displacement is downwards like the weight, the work done by gravity is positive, while the work done by the tension is negative since it points upwards.

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3 years ago