1 A thing ring has a mass of 6kg and a radius of 20cm. calculate the rotational inertia.
1 answer:
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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 =
θ₁ = tan⁻¹ 1.90
θ₁ = 62.29º
for the second case x₂ = 1.46 m
tan θ₂ = x₂ / L
θ₂ = tan⁻¹
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
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
old
We know that the parent Isotope remaining is given by the expression
where,
n = number of half lives passed
<h3>lokium Isotope</h3>From the question, the parent Isotope remaining is lokium
Therefore,
means 2 half lives have passed.
If from the question,
1 half life = 1000years
<h3>Rock age</h3>Therefore,
The rock sample's age =
For more information on rock samples such as lokium and DOL , visit