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inna [77]
3 years ago
12

An unknown substance has a mass of 15 g and a volume of 4 cm3. Calculate the density of the unknown substance.

Physics
1 answer:
myrzilka [38]3 years ago
5 0

Answer:

Density is 3.75g/cm3

Explanation:

Density = mass ÷ volume

= 15g ÷ 4cm3

= 3.75g/cm3

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Alika [10]

Answer:

Sound travels faster in liquids than in gases because molecules are packed more closely together. This means that when the water molecules begin to vibrate, they quickly begin to collide with each other forming a rapidly moving compression wave. Sound travels over four times faster than in air

Explanation:

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2 years ago
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If the temperature of an iron sphere is increased A)its density will decrease .B)its volume will decrease. C)its mass will decre
babymother [125]

Answer:

A) Its density will decrease

Explanation:

When an object is heated, its volume increases. This is due to the fact that the particles in the medium vibrate more (if it is a solid) or they move more (if it is a liquid or a gas), therefore they tend to occupy a larger space.

At the same time, the mass of the object does not change, because the mass just represents the amount of matter contained in the object, so it does not increase/decrease at different temperatures.

The density of an object is defined as the ratio between the mass (m) and the volume (V):

d=\frac{m}{V}

We said that the mass remains unchanged while the volume increases: since the density is inversely proportional to the volume, this means that the density decreases.

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3 years ago
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How the Law of Conservation of Matter is supported by the experimental demonstrations?
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6 0
2 years ago
Which feature or process is unique to nuclear power plants when compared to conventional coal-burning power plants?
Mazyrski [523]

Answer:

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The first thing you should know is that acceleration is a vector, therefore, it has magnitude, and direction.

By definition, we have that the vector acceleration is given by:

a = \frac{dv}{dt}\\

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a = \frac{\frac{m}{s}}{s}\\

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The symbol of acceleration is:

a^{->}

Answer:

The statements about acceleration that are true are:

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