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Flauer [41]
3 years ago
11

4. Lead has a density of 11.5g/cm3. A rectangular block of lead measures 7cm ×5cm×2cm.

Physics
1 answer:
MArishka [77]3 years ago
6 0

Answer:

a.) volume = 70cm^3

b.) mass = 805 grams

Explanation:

see the explanation in attachment.

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The black woodpecker's beak is connected to its skull with ____ to prevent jolts.​
Nina [5.8K]

Answer:

hyoid bone

Explanation:

Woodpeckers have a special bone that acts like a seat-belt for its skull. It's called the hyoid bone, and it wraps all the way around a woodpecker's skull. Every time the bird pecks, the hyoid acts like a seat-belt for the bird's skull and the delicate brain it protects.

5 0
2 years ago
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Given the indices of refraction n_1 and n_2 of material 1 and material 2, respectively, rank these scenarios on the basis of the
aniked [119]

Answer:

a)  order of refraction is a, e, de, c , c) a f g

Explanation:

a) when lightning is refracted it must comply with the law of refraction

          .n₁ sin θ₁ = n₂ sinθ₂

          sin θ / sin δδa) when lightning is refracted it must comply with the law of refraction

          .n1 sin θ₁ = n2 sin θ ₂

          Sint θ1 / sin θ2 = n2 / n1

1 we see that the ray deviation is promotional to the ratio of the refractive indices

The order of refraction is a, e, de, c

.b) When a ray passes from a medium with less indicated refraction to a higher index the part of the reflected ray has a phase change of 180º

a) no phase change

b) reflected ray has a phase change of 180º

c) no phase change

d) no phase change

e) there is a phase change

f) these phase changeo  

1 we see that the ray deviation is promotional to the ratio of the refractive indices

The order of refraction is a, e, de, c

.b) When a ray passes from a medium with less indicated refraction to a higher index the part of the reflected ray has a phase change of 180º

a) no phase change

b) reflected ray has a phase change of 180º

c) no phase change

d) no phase change

e) there is a phase change

f) ay phase vabio

7 0
3 years ago
Why are chemical changes considered “unseen”?
jeka57 [31]
<span>Because they occur at an atomic level, changing the actual structure of the thing.

</span>
7 0
3 years ago
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Match the geologic time period with its corresponding event.
Mandarinka [93]

The dinosaurs first appeared in the Mesozoic and the first mass extinction occurred during the Paleozoic. Moreover, humans first appeared in the Cenozoic.

<h3>The geological eras and biological events</h3>

The dinosaurs emerged during the Triassic Period of the Mesozoic Era, approximately 220-225 million years ago.

The first mass extinction occurred in the Ordovician Period (the second period of the Paleozoic Era).

The Cenozoic is the current geological Era that encompasses the last 60 million years.

Learn more about geological eras here:

brainly.com/question/1288853

4 0
2 years ago
1. A(n) ___________ forms when atoms share one or more pairs of electrons.
Nitella [24]
1.COVALENT BOND   [c]                                                                                         2. Ionic bond                [d]                                                                                         3. Ionic bond             [d]                                                                                             4. a reaction where energy is released [b]                                                                5. 2FE2C03=4FE=3CO2 [a]                                                                                     6. The mass of reactant must be equal to  the number of mass of the product            [a]                                                                                                         7. Valence electrons [a]                                                                                             8. Atomic number [a]                                                                                                9. combustion  [c]                                                                                                      10. More nitrogen in the nitrogen cycle [a]
8 0
3 years ago
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