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3 years ago

7

What happens when a substance undergoes a physical change?

2 answers:

Andreyy893 years ago

4 0

It visually changes but keeps it's properties like ice to water to steam.

zaharov [31]3 years ago

4 0

Answer:

Its form is affected

Explanation:

A physical change implies only a modification in the physical properties of a substance. Contrary to this in a chemical change not only its form but its composition changes.

Processes like melting, transition to a gas, change of strength, textural change, shape, size, color, volume, and density, are examples of physical changes.

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An electric generator transforms mechanical energy into electrical energy. This process could be done by which of these?

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Answer:

its d

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Multiply 0.00032 cm by 4.02 cm and express the answer in scientific notation

FromTheMoon [43]

0.00032cm*4.02=1.2864 × 10^-3 in scientific notation.

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3 years ago

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A parallel plate capacitor is created by placing two large square conducting plates of length and width 0.1m facing each other,

borishaifa [10]

Answer:

8.854 pF

Explanation:

side of plate = 0.1 m ,

d = 1 cm = 0.01 m,

V = 5 kV = 5000 V

V' = 1 kV = 1000 V

Let K be the dielectric constant.

So, V' = V / K

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C = 8.854 pF

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3 years ago

A driver travels 225 miles in 4 hours and 30 minutes. What was his average speed in mph?

andrew-mc [135]

Answer:

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3 years ago

eimsori [14]

The time taken for the two balls to hit each other is 8 s.

The given parameters:

<em>Acceleration of the rocket, a = 2 m/s²</em>
<em>Length of the chamber, s = 4 m</em>
<em>Speed of the first ball, = V1 = 0.3 m/s</em>
<em>Speed of the second ball, V2 = 0.2 m/s</em>

The time taken for the two balls to hit each other is calculated by applying relative velocity formula as shown below;

$(V_1 - (-V_2) )t = s\\\\(V_1 + V_2) t = s\\\\(0.3 + 0.2) t = 4\\\\0.5t = 4\\\\t = \frac{4}{0.5} \\\\t = 8 \ s$

Thus, the time taken for the two balls to hit each other is 8 s.

Learn more about relative velocity here: brainly.com/question/17228388

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2 years ago

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