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TiliK225 [7]
3 years ago
13

The density of gold is 19 300kg/m cube. what is the mass of gold cube with the length 0.2015m?

Physics
1 answer:
Sergeeva-Olga [200]3 years ago
4 0

Answer:

157.9 kg

Explanation:

Density: This can be defined as the ratio of the mass of a body and it's volume.

The S.I unit of density is kg/m³.

From the question,

Density = Mass/volume

D = m/v............................ Equation 1

Where D = Density of gold, m = mass of gold, v = volume of gold.

make m the subject of the equation

m = Dv.................... Equation 2

Since the gold is a cube,

v = l³................... Equation 3

Where l = length of the gold cube.

Substitute equation 3 into equation 2

m = Dl³............... Equation 4

Given: D = 19300 kg/m³, l = 0.2015 m

Substitute into equation 4

m = 19300(0.2015)³

m = 157.9 kg.

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Answer:

0.56 atm

Explanation:

First of all, we need to find the number of moles of the gas.

We know that

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So, the number of moles of the gas is

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Now we can find the pressure of the gas by using the ideal gas equation:

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n = 0.023 mol is the number of moles

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Solving the equation for p, we find

p=\frac{nRT}{V}=\frac{(0.023 mol)(8.314 J/mol K)(298 K)}{0.001 m^3}=5.7 \cdot 10^4 Pa

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the pressure in atmospheres is

p=\frac{5.7\cdot 10^4 Pa}{1.01\cdot 10^5 Pa/atm}=0.56 atm

5 0
4 years ago
According to the law of conservation of momentum, objects will either stick together or bounce off of each other when they colli
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an astronaut on earth notes that in her soft drink an ice cube floats with 9/10 of its volume submerged. if she were instead in
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The gravitation force is 1/6 that of earth, and the ice in the same soft drink would float with 9/10 submerged option (B) is correct.

<h3>What is gravitational force?</h3>

All mass-bearing objects are attracted by gravitational force. Because it consistently attempts to bring masses together rather than push them apart, the gravitational force is referred to as attractive.

As we know, the gravitational force is given by:

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Where G is the gravitational constant.

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r is the distance between the masses.

Weight of ice cube = weight of soft drink displaced

mg = ρVg

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3 0
1 year ago
An electron moves at a speed of 1.0 x 104 m/s in a circular path of radius 2 cm inside a solenoid. The magnetic field of the sol
iogann1982 [59]

Answer:

(a) B = 2.85 × 10^{-6} Tesla

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r = \frac{mv}{qB}

⇒ B = \frac{mv}{qr}

Where: r is the radius, m is the mass of the electron, v is its velocity, q is the charge on the electron and B is the magnetic field

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b. Given that; N/L = 25 turns per centimetre, then the current, I, can be determined by;

B = μ I N/L

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I = B ÷ μN/L

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Answer;

It's about acceleration, right?

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