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3 years ago

Hot coffee in a mug cools over time and the mug warms up. Which describes the energy in this system?

Physics

2 answers:

Travka [436]3 years ago

8 0

Answer: option 3

The heat energy from the coffee is transferred to the mug. This is because of entropy change. For a certain time period the coffee release the heat to the adjacent walls of the mug. But after certain period of time both the mug and coffee reaches to the same temperature i.e., they become under equilibrium state.

And also over the time period the heat may also transfers to the surroundings and the mug will cool down and matches to the surrounding temperature.

natima [27]3 years ago

4 0

Answer: Thermal energy from the coffee is transferred to the mug.

Explanation:

Heat loss will occur due to convection radiation and conduction

The mug gains heat from the coffee by conduction

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A wave has a wavelength of 4. 9 m and a velocity of 9. 8 m/s. The medium through which this wave is traveling is then heated so

tatiyna

The wavelength of a wave is obtained by taking the ratio of wave speed and frequency.

The wavelength of the heated wave is 9.8 m. Hence, option (b) is correct.

What is frequency of a wave?

The number of oscillations completed by a wave in one second is known as the frequency of a wave. It is expressed as the ratio of the velocity of the wave to its wavelength.

Given data-

The wavelength of the wave is, $\lambda = 4.9 \;\rm m$ .

The velocity of the wave is, v = 9.8 m/s.

The mathematical expression for the frequency of the wave is,

$f = \dfrac{v}{\lambda}$

Solving as,

$f = \dfrac{9.9}{4.9}\\\\f =2 \;\rm Hz$

Now, with constant frequency and the double magnitude of velocity (v' = 2 × 9.8 = 19.6 m/s). The wavelength of the heated wave is calculated as,

$f = \dfrac{v'}{\lambda'}$

here,

$\lambda'$ is the wavelength of the heated wave.

Solving as,

$2 = \dfrac{19.6}{\lambda'}\\\\\lambda' = \dfrac{19.6}{2}\\\\\lambda' = 9.8 \;\rm m$

Thus, we can conclude that the wavelength of the heated wave is 9.8 m. Hence, option (b) is correct.

Learn more about the frequency of wave here:

brainly.com/question/1324797

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2 years ago

When you kick a ball by a force of 26.3 newtons, what is the magnitude and direction of the force that you experience?

VikaD [51]

26.3 N in the reverse direction

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3 years ago

What is the difference between a learner’s license and an operator’s license?

Stells [14]

A Learner’s license is available to those at least 15 years old that have passed the written and vision tests.
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3 years ago

Explain how you can use the factors of production to produce a fruit juice in a production company

frozen [14]

Answer:

The factors of production include Land, Labour, Capital and Enterpreneurship

Explanation:

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The cost of planting and payment of workers usually comes from the capital which is often used in running the business by the owner which makes certain decisions to ensure the fruit company is in place. All these factors work hand in hand to ensure production of fruit in a production company is possible.

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2 years ago

Help.. mee.. ;-; Dont answer if you dont know I dont want to fail this

timama [110]

Answer:

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Explanation:

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2 years ago

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