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Anarel [89]
3 years ago
10

Determine the change in thermal energy of 100 g of copper (M = 63,5, Debye 348K) if it is cooled from

Physics
1 answer:
Setler [38]3 years ago
8 0

Answer:

given,

mass of copper = 100 g

latent heat of liquid (He) = 2700 J/l

a) change in energy

Q = m Cp (T₂ - T₁)

Q = 0.1 × 376.812 × (300 - 4)

Q = 11153.63 J

He required

Q = m L

11153.63 = m × 2700

m = 4.13 kg

b) Q = m Cp (T₂ - T₁)

Q = 0.1 × 376.812 × (78 - 4)

Q = 2788.41 J

He required

Q = m L

2788.41 = m × 2700

m = 1.033 kg

c) Q = m Cp (T₂ - T₁)

Q = 0.1 × 376.812 × (20 - 4)

Q = 602.90 J

He required

Q = m L

602.9 = m × 2700

m =0.23 kg

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Which of these is not shared by bohrs model and the modern atomic model?
KonstantinChe [14]

Answer:

D. both have electrons that orbit the atomic nucleus in a simaler way

Explanation:

the bohrs model electrons orbit in a circular pattern were as the modern atomic model orbit in every which way

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3 years ago
You nose out another runner to win the 100.000m dash. If your total time for the race was 11.8 seconds and you aced out the othe
daser333 [38]
You completed 100.000 m in 11.800 second

you aced out the other runner by 0.001 seconds

time taken by other runner to finish = 11.800 + 0.001 = 11.801s

speed of other runner = 100/11.801 m/s

distance covered by him in 11.8 s = 100/11.801 × 11.8 = 99.992 m

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4 years ago
Question 29 (1 point)
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The answer is true. fluorescence demonstrates a sparkly like light beam and also can bounce off of other beams
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What do astronomers use to calculate the age of the universe
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The age of the oldest stars ,

Patterns of background radiation ,

How fast distant galaxies are moving away from us.

6 0
3 years ago
Read 2 more answers
How could Sam determine the distance he drove and the true displacement between the two locations
irina1246 [14]

Distance is the physical length travelled. While the displacement is the shorter distance between any two given points.

<h3>What is distance?</h3>

Distance is a numerical representation of the distance between two objects or locations.

Distance can refer to a physical length or an estimate based on other factors in physics or common use. |AB| is a symbol for the distance between two points A and B.

Displacement is defined as the shortest distance between the two points.

Sam determines the distance by doing the calculation as;

distance = speed × time

Hence, the Sam determines the distance and displacement by the respective formulas.

To learn more about the distance, refer to the link;

brainly.com/question/26711747

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