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3 years ago

23. Explain how the particles move before, during, and after melting.

Physics

1 answer:

Ket [755]3 years ago

3 0

Answer:

Answer: Option (D) is the correct answer.

Explanation:

Before placing the spoon in a hot liquid, particles of spoon were closer to each other and vibrating at their respective positions.

But when the spoon is placed in a hot liquid then due to increase in temperature of spoon its particles gain kinetic energy. Therefore, they colloid more frequently.

Thus, we can conclude that switch the labels on the diagrams best explains how to correct Alana’s error.

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Digital thermometers often make use of thermistors, a type of resistor with resistance that varies with temperature more than st

Nezavi [6.7K]

Answer:

The temperature coefficient of resistivity for a linear thermistor is $1.38\times10^{-3}^{\circ}C^{-1}$

Explanation:

Given that,

Initial temperature = 0.00°C

Resistance = 75.0 Ω

Final temperature = 525°C

Resistance = 275 Ω

We need to calculate the temperature coefficient of resistivity for a linear thermistor

Using formula for a linear thermistor

$R=R_{0}(1+\alpha\Delta T)$

$R=R_{0}+R_{0}\alpha\Delta T$

$\alpha=\dfrac{R-R_{0}}{R_{0}\Delta T}$

Put the value into the formula

$\alpha=\dfrac{275-75}{275\times(525-0)}$

$\alpha=1.38\times10^{-3}^{\circ}C^{-1}$

Hence, The temperature coefficient of resistivity for a linear thermistor is $1.38\times10^{-3}^{\circ}C^{-1}$

4 0

3 years ago

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You have a suspect on the run in a dry, wooded area; they’ve ditched the gun but are hiding from you. how long do you have to fi

erma4kov [3.2K]

Answer:

C. a few days

Explanation:

The evidence that we will have to investigate is the gunshot residue on the body of the suspect. When a person fires a gun there will be a deposition of material from the components of the chemicals present in the gun. This deposit is called gunshot residue and consists of particles of the propellant or explosive primer.

Experimentation has shown that the period of time that is person will test possible for gunshot residue is 5.27 days.

7 0

3 years ago

State laws of magnetism

kykrilka [37]

Explanation:

A basic law of magnetism is that unlike poles attract each other. Two bar magnets can illustrate this. ... A pole of the second is brought, in turn, near each of the two ends of the hanging magnet.

Second Law of Magnetism

The force is in direct proportion to the product of the forces of the pole. The force exists in inverse proportion to the square of the middle distance between the poles. The force is dependent on the specific medium in which the magnets are placed.

4 0

3 years ago

The cart travels the track again and now experiences a constant tangential acceleration from point A to point C. The speeds of t

Veronika [31]

Answer:

the cart's speed at point B is 15.72 ft/s

Explanation:

Given the data in the question;

The car travels from point A to C in 3.00 s, its average acceleration $a_{avg}$ will be;

$a_{avg}$ = [ $V_{c}$ - $V_{A}$ ] / Δt

$V_{c}$ is 17.4 ft/s, $V_{A}$ is 13.2 ft/s and Δt is 3.00 s

so we substitute

$a_{avg}$ = [17.4 - 13.2] / 3

$a_{avg}$ = 4.2 / 3

$a_{avg}$ = 1.4 ft/s²

so average acceleration of the cart between the points A and B is 1.4 ft/s²

The instantaneous value of the velocity of the cart at point B will be;

$a_{avg}$ = Δv / Δt

now substitute [ $V_{c}$ - $V_{B}$ ] for Δv and t' for Δt

$a_{avg}$ = [ $V_{c}$ - $V_{B}$ ] / t'

$V_{B}$ = $V_{c}$ - $a_{avg}$ ( t' )

so we substitute 17.4 ft/s for $V_{c}$ , 1.20 s for t' and $a_{avg}$ = 1.4 ft/s²

$V_{B}$ = 17.4 - (1.4 × 1.20)

$V_{B}$ = 17.4 - 1.68

$V_{B}$ = 15.72 ft/s

Therefore, the cart's speed at point B is 15.72 ft/s

5 0

3 years ago

How does the wind reversing make the tempurature change asap pls

OlgaM077 [116]

Answer:

Because the difference in air temperature of neighbouring air masses causes the wind to blow. Warmer air is less dense, so colder air subsides into the space occupied by the warmer air due to the force of gravity, displacing the warmer air upwards. This is fundamentally the reason temperature change may be accompanied by wind. It is possible to think of situations where only one of these effects is observed at any one place, due to the large size or stationary nature of atmospheric boundary phenomena.

Explanation:

3 0

2 years ago

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