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3 years ago

Which quantity is a scalar quantity?

Physics

1 answer:

kow [346]3 years ago

3 0

Answer:

area is the scalar quantity

Explanation:

Scalar quantity are those which only have magnitude and no direction.

For example: mass, time, distance etc.

Vector quantity are those which have both magnitude and direction.

For example: displacement , velocity etc.

From the given options, the quantity which is scalar is are a because it only has magnitude but no directions.

Where acceleration, velocity, displacement and force all are vector quantities., the correct answer is option B.

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Answer:

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Explanation:

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2 years ago

What is the first time at which the kinetic energy is twice the potential energy?

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3 years ago

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Answer:

C) one-half as great

Explanation:

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$\Delta x=v_0t+\frac{gt^2}{2}$

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3 years ago

Your friend wants to join the school track team, and has asked for your help to determine how fast she can run. What kind of inf

Zigmanuir [339]

Answer:

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hope this helps

have a good day :)

Explanation:

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3 years ago

Heat transfers energy from a hot object to a cold object. Both objects are isolated from their surroundings. The change in entro

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To develop this problem we will start from the definition of entropy as a function of total heat, temperature. This definition is mathematically described as

$S = \frac{Q}{T}$

Here,

Q = Total Heat

T = Temperature

The total change of entropy from a cold object to a hot object is given by the relationship,

$\Delta S = \frac{Q}{T_{cold}}-\frac{Q}{T_{hot}}$

From this relationship we can realize that the change in entropy by the second law of thermodynamics will be positive. Therefore the temperature in the hot body will be higher than that of the cold body, this implies that this term will be smaller than the first, and in other words it would imply that the magnitude of the entropy 'of the hot body' will always be less than the entropy 'cold body'

Change in entropy $\Delta S_{hot}$ is smaller than $\Delta S_{cold}$

Therefore the correct answer is C. Will always have a smaller magnitude than the change in entropy of the cold object

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3 years ago