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satela [25.4K]
3 years ago
15

The sun rose at 6:54 this morning.is this an observation or inference?

Physics
2 answers:
Levart [38]3 years ago
8 0

Answer:

observation

Explanation:

Through an observation information is acquired. The acquiring of information must be through the five senses directly or indirectly. When a person takes an observation using eyes it is a form direct observation. When a person takes an observation using scientific instruments it is a form indirect observation.

Inference is the deduction of observations taken.

Here, the sun rose at 6:54 this morning is an observation i.e., a person saw the sun rise at 6:54. It has not been deduced that the sun rose at 6:54.

jeka57 [31]3 years ago
4 0


Observation: You saw/ observed something and you are stating that.

Inference: You are predicting something to be true. If so and so, then this will occur.

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Answer:

Option B) The fuel for nuclear fusion comes from sea water

Explanation:

Nuclear fusion can not be carried out by using any type of water as water is composed of stable water molecules (H_{2}O which is quite difficult to be decayed by any simple method.

Moreover, fusion reactions demands the combination of nuclei of lighter elements for which it makes use of the heavy isotopes of Hydrogen that are Deuterium and Tritium as fuel to carry out the nuclear fusion.

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Meaning of live stock farming​
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Livestock is commonly defined as domesticated animals raised in an agricultural setting to produce labor and commodities such as meat, eggs, milk, fur, leather, and wool. In particular, livestock, especially beef, dairy and sheep stocks, have out-sized influence on greenhouse gas emissions from agriculture

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two soccer players are running for the same ball during a game. Without looking the two collide. One player has a mass of 45 kg
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4 years ago
A meteorite has a speed of 90.0 m/s when 850 km above the Earth. It is falling vertically (ignore air resistance) and strikes a
Schach [20]

Before it hits the sand bed, the meteorite is accelerating uniformly with g=9.80\dfrac{\rm m}{\mathrm s^2}, so that its speed v satisfies

v^2-{v_0}^2=-2g\Delta y

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v^2-\left(-90.0\dfrac{\rm m}{\rm s}\right)^2=-2\left(9.80\dfrac{\rm m}{\mathrm s^2}\right)(-850,000\,\mathrm m)\implies\boxed{v=4080\dfrac{\rm m}{\rm s}}

3 0
3 years ago
A 50 kg boy is at the edge of a circular platform of radius 4.0 m which is rotating freely
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Answer:

0.62 rad/s

Explanation:

Angular momentum is conserved.

I₁ ω₁ = I₂ ω₂

where I is moment of inertia and ω is angular velocity.

The total moment of inertia is the sum of the platform's inertia and the boy's.

(I + m r₁²) ω₁ = (I + m r₂²) ω₂

Given I = 1000 kg m², m = 50 kg, r₁ = 4.0 m, r₂ = 3.0 m, and ω₁ = 0.5 rad/s:

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900 = 1450 ω₂

ω₂ = 0.62 rad/s

8 0
3 years ago
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