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Margarita [4]
2 years ago
9

Based on the principles of convection, conduction and thermal radiation, which scenario below is most similar to the following s

ituation?
You put a heating pad on your back after exercising.
A) Feeling a metal wire get warmer as you roast a marshmallow over a fire.
B) Warm air rising in a room where the air is moving.
C) The sun warming up the roof on a house.
D) Cold water sinking in a pot of water being warmed up on the stove.
Physics
2 answers:
Andrei [34K]2 years ago
8 0

Answer: Option (A) is the correct answer.

Explanation:

In convection, conduction, and thermal radiation there is transfer of heat. When you put a heating pad on your back after exercising then there will be transfer of heat from heating pad to the human body.

Similarly, when we roast a marshmallow then metal wire on which marshmallow is placed gets warm due to thermal radiation from fire, there will be conduction as heat is transferring from marshmallow to the wire and also there will be convection process as marshmallow will melt and sink at the bottom.

Since metal wire is held by our hand so, we will also feel the heat.

Thus, we can conclude that the most similar of the following situation is feeling a metal wire get warmer as you roast a marshmallow over a fire.

ozzi2 years ago
3 0
The answer is A- feeling a !etal wire get warmer as you roast a !arshmallow over a fire
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So the correct FBD will contain only one force and that force must be vertically downwards

So here correct answer must be

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8 0
2 years ago
Ultrasonic images are obtained from the inside organs of our body. This process uses which property of sound wave?
Temka [501]

This question involves the concepts of echo, ultrasonic images, ultrasonic sound waves.

The process of ultrasonic images uses the "echo" property of the sound waves.

Echo is the property of the sound wave by the virtue of which the sound wave reflects back to the source of the sound after hitting a surface or an object.

Ultrasonic images are obtained from inside organs of our body. This process involves the use of ultrasonic sound waves that have a frequency greater than 20,000 Hz. These sound waves are out of the range of audible sound by the human ear. When these ultrasonic sound waves are sent in form of pulses into the human body by the use of probes, they reflect back from the tissues of different organs to the probe. The probe then records the reflection properties of these sound waves and displays them in form of an image, known as ultrasonic images.

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4 0
2 years ago
Does the accuracy of a measurement made always depend on the precision of the instrument used to make the measurement? Why or Wh
mina [271]

Answer:

B

Explanation:

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8 0
3 years ago
A circular curve of radius 150 m is banked at an angle of 15 degrees. A 750-kg car negotiates the curve at 85.0 km/h without ski
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Then to calculate the frictional force (f) we can use the second equation

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f= 750 *9.8 sin(15°)-750*(85*1000/3600)^2/150= -880 N

6 0
2 years ago
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mylen [45]

Answer:

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2500/3.5 = 714.285s = 700s (with sig figs)

7 0
2 years ago
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