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3 years ago

Which process is an example of a physical change?

Physics

1 answer:

Anit [1.1K]3 years ago

8 0

Answer:

Option A

Carrots are cut into small pieces and mixed into a salad

Explanation:

When physical changes occur, the actual composition remain the same but the molecules are re-arranged. Therefore, when carrots are cut into smaller pieces and mixed into salad, there will be no chemical reaction hence the actual composition will remain the same despite being cut and molecules in it re-arranged. Considering the other options, new substances are formed hence they are deemed as chemical changes. Therefore, option A is correct.

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Two parallel plates having charges of equal magnitude but opposite sign are separated by 11.0 cm. Each plate has a surface charg

VashaNatasha [74]

Two parallel plates having charges of equal magnitude but opposite sign are separated by 11.0 cm. Each plate has a surface charge density of 49.0 nC/m2. A proton is released from rest at the positive plate.

(a) Determine the magnitude of the electric field between the plates from the charge density.

b) Determine the potential difference between the plates.

Answer:

The Electric Field between the two plate is $E = 5.536*10^3 N/C$

The potential difference between the plate is V = $609 \ Volts$

Explanation:

From the we are given that

The separation between the plate is $d = 11.0 cm$

The surface charge density is $\sigma = 49.0 n C/m^2 = 49.0*10^{-9}$

Generally Electric field between the plate is mathematically given as

$E = \frac{\sigma }{\epsilon_0}$

Note that $\epsilon_0$ is the permitivity of free space and its value is $8.85 *10 ^{-12} C^2 /N \cdot m^2$

Now substituting values we have

$E = \frac{49*10^{-9}}{8.85*10^{-12}}$

$5.537*10^3 N/C$

Generally Potential difference between the plate is mathematically given as

$V =Ed$

Where E is the electric field which is $E = 5.536*10^3 N/C$

Substituting value we have

V = $= (5.537*10^3 N/C) (11.0*10^{-2}) =609 V$

3 0

4 years ago

You leave a hammer in the sun for several hours. When you pick it up, heat is transferred to your hand. How is most of the heat

zmey [24]

Because it is touching, the heat is being transferred via conduction.

4 0

3 years ago

It was a dark and stormy night.Buffy hameard thunder exactly 6 secounds after she saw lightning , the temperature of air is 15°C

SashulF [63]

Answer:

υ = 345.82 m/s

Explanation:

The formula used to find the speed of sound in air, at different temperatures is given as follows:

$v = v_{0}\sqrt{\frac{T}{273} }$

where,

υ = speed of sound at given temperature = ?

υ₀ = speed of sound at 0°C = 331 m/s

T = temperature in K = 15°C + 273 = 298 k

Therefore, using these values in the equation, we get:

$v = (331 m/s)\sqrt{\frac{298 k}{273 k}}\\$

5 0

3 years ago

Mars is known as Earth’s sister planet.

grigory [225]

1. True
2. Mercury
3. Jupiter
4. False its Jupiter than Saturn
5. False
6. True
7. I think maybe Venus sry don't know this one lol
8. Storm
9. Uranus

7 0

3 years ago

If an airplane is moving at a constant speed of 500 miles per hour in a straight line is it accelerating?

Zinaida [17]

No. It’s moving at a constant speed (speed is not changing) in a straight line (same direction so velocity is not changing) so it is not accelerating. Acceleration only occurs if there’s a change in speed/velocity.

4 0

4 years ago

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