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Svetllana [295]
3 years ago
15

Janet performed a correlational study on the relationship of hours of sleep and performance on a midterm. She found the correlat

ion coefficient to be .32. This indicates that
A. the relationship between sleep and exam performance is fairly strong




B. there is really no relationship between sleep and exam performance.




C. as hours of sleep increase, test performance goes down




D. as hours of sleep decreases, test performance stays the same.
Physics
2 answers:
slavikrds [6]3 years ago
5 0

Answer: The answer is A

Explanation: There is a strong relationship between them because if you get more sleep then you will have more energy and focus more on the exam.

Sergeeva-Olga [200]3 years ago
5 0
The answer is A

If I’m wrong pls tell me

Hope this helps ✌️
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3 years ago
When using a calorimeter, the initial temperature of a metal is 70.4C. The initial temperature of the water is 23.6C. At the end
Sunny_sXe [5.5K]

1) 29.8 C

At the beginning, the metal is at higher temperature (70.4 C) while the water is at lower temperature (23.6 C). When they are put in contact, the metal transfers heat to the water, until they reach thermal equilibrium: at thermal equilibrium the two objects (the metal and the water have same temperature). Therefore, since the temperature of the water at thermal equilibrium is 29.8 C, the final temperature of the metal must be the same (29.8 C).

2) 6.2 C

The temperature change of the water is given by the difference between its final temperature and its initial temperature:

\Delta T = T_f - T_i

where

T_f = 29.8 C\\T_i = 23.6 C

Substituting into the formula,

\Delta T=29.8 C-23.6 C=6.2 C

And the positive sign means that the temperature of the water has increased.

3) -40.6 C

The temperature change of the metal is given by the difference between its final temperature and its initial temperature:

\Delta T = T_f - T_i

where

T_f = 29.8 C\\T_i = 70.4 C

Substituting into the formula,

\Delta T=29.8 C-70.4 C=-40.6 C

And the negative sign means the temperature of the metal has decreased.

5 0
4 years ago
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Answer:

Could you please add the events

Explanation:

if not I could give a brief explanation of what happens in the phase and you could just eliminate?

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Katena32 [7]

Answer:

See explanations

Explanation:

Given that,

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The energy stored in an electric field is given as

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Where

U is the energy stored

εo is permissivity and it value is 8.85×10^-12C²/N..m²

And E is the electric field

Then,

U=½×8.85×10^-12×135²

U=8.06×10^-8J/m³

Then, the energy stored in 1m³ of air is 8.06×10^-8 J/m³

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