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3 years ago

What is the mass of a magnesium block that measures 2.5cm x 3.5cm x 1.5cm?

Physics

2 answers:

lukranit [14]3 years ago

4 0

Answer: 22.8 g

Explanation:

1) density = mass / volume ⇒ mass = density × volume

2) density of magnesium = 1.74 g/cm³ (from internet)

3) volume of a block = length × width × depth

volume of the magnesium block = 2.5cm × 3.5 cm × 1.5 cm = 13.125 cm³

4) mass of the magnesium block = 1.74 g/cm³ × 13.125 cm³ = 22.8375 g.

Rounding to 3 significant figures, mass = 22.8 g ← answer

antiseptic1488 [7]3 years ago

3 0

The mass of the magnesium block is found to be <u> 22.8 g.</u>

Density of a substance is defined as mass per unit volume.

Calculate the volume V of the magnesium block using the dimensions given in the problem.

$V=(2.5cm)(3.5cm)(1.5cm)\\ =13.125cm^3$

Magnesium has a density ρ of 1.74g/cm³. This can be taken from the standard tables.

Since density is mass per unit volume,

$\rho=\frac{m}{V}$

The mass of the block is therefore given by,

$m=\rho V$

Substitute 1.74g/cm³for ρ and 13.125 cm³for V.

$m=\rho V=(1.74g/cm^3)(13.125cm^3)=22.8375g$

The mass of the magnesium block is found to be <u> 22.8 g.</u>

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3 years ago

One violin creates a sound whose intensity level is 60dB. Find the intensity level of 16 violins, each playing at this intensity

Yanka [14]

Answer:

72.04 dB.

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solving for $I$ we get:

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3 years ago

When reading a digital volt-ohmmeter (DVOM), you have a reading of 2168 mV, which is the same as:__________

levacccp [35]

Answer:

D, both A and B

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The primary unit is Volt, represented as V. Due to the fact that there can be a much higher reading, or an even much more smaller one, comes the need for variants of the same unit.

10^-3 is called milli and represented as m

10^3 is called killo and represented as k

10^-6 is called micro and represented as µ

10^6 is called mega and represented as M

and even much higher variants of up to 10^12 and 10^-12

As we can see from the aforementioned example, 10^-3 is milli and represented as m

And our question gave us the unit in mV, which stands for millivolts.

Also, if we look at option B, it states, 2.168 volts. This 2.168 volts is also the same thing as A. Take a look at it this way, I said mV is 10^-3, right?

So, 2168*10^-3 is also 2168/100 which is 2.168. The only difference here is, once we make this conversion from mV, we have to drop the milli tag, because we have already made a conversion, and thus, leave it as V.

2168 mV = 2.168V

Hence why we picked option D, Both A & B as the right one

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3 years ago