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kaheart [24]
3 years ago
7

1 A thing ring has a mass of 6kg and a radius of 20cm. calculate the rotational inertia. ​

Physics
1 answer:
marissa [1.9K]3 years ago
7 0

Answer:

2400kgm²

Explanation:

Rotational inertia=mass x radius²

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Gravity is ____________________ to the distance between and difference in mass between two objects
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Gravity is proportional to its mass<span> and </span>distance between<span> it and another </span><span>object</span>
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As you move from left to right on the periodic table, what generally happens to the electronegativity? *
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It increases as the number of protons and electrons in the shell increases
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A small mirror is attached to a vertical wall, and it hangs a distance of 1.87 m above the floor. The mirror is facing due east,
Oksana_A [137]

Answer:

 t = 1.62 h

Explanation:

A flat mirror fulfills the law of reflection where the incident angle is equal to the reflected angle.

          θ_i = θ_r

If we use trigonometry to find the angles, the mirror is at a height of L = 1.87 m,   and the reflected rays reach a distance x1 = 3.56 m

         tan θ₁ = x₁ / L

         tan θ₁ = \frac{3.56}{1.87}

         θ₁ = tan⁻¹  1.90

         θ₁ = 62.29º

for the second case x₂ = 1.46 m

        tan θ₂ = x₂ / L

        θ₂ = tan⁻¹  \frac{1.46}{1.87}

        θ₂ = 37.98º

the difference in degree traveled is

         Δθ = θ₁- θ₂

          Δθ = 62.29 - 37.98

          Δθ = 24.31º

as in the exercise they indicate that every 15º there is an hour

         t = 24.31º (1h / 15º)

         t = 1.62 h

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3 years ago
Speed acceleration question.
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Assume each trial ( roll of cubes) represents 1000 years. Imagine that you found a rock sample was 25% Lokium and 75% DOL, how w
olasank [31]

Assuming each trial represents 1000years, and <u>rock </u>samples were found, the rock sample will be given half-life of

  • The rock sample will be 2000years old

<h3>Isotope</h3>

We know that the parent Isotope remaining is given by the expression

\frac{1}{2}^n

where,

n = number of half lives passed

<h3>lokium Isotope</h3>

From the question, the parent Isotope remaining is 25\% lokium

0.25 = \frac{1}{4} = \frac{1}{2^2} = \frac{1}{2}^2

Therefore,

\frac{1}{2}^2 means 2 half lives have passed.

If from the question,

1 half life = 1000years

<h3>Rock age</h3>

Therefore,

The rock sample's age = 2*1000 = 2000years

For more information on rock samples such as lokium and DOL , visit

brainly.com/subject/chemistry

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