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3 years ago

A rock occupies a volume of 2cm3 and has a mass of 54 grams. find the density of this rock.

1 answer:

5 0

Density is Mass divided by Volume, or;
$D=\frac{M}{V}\\D=\frac{54g}{2cm^{3}}=27\frac{g}{cm^{3}}$
Your answer is 27 g/cm³.

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Find the magnitude of the electrostatic force between a Na+ ion and a Cl− ion separated by 0.46 nm. N (b) Would the answer chang

adell [148]

Answer:

electrostatic force = 1.08 × $10^{-9}$ N

and if sodium ion replace by Li+ and chloride by Br− then there will be no change in electrostatic force

magnitude of electrostatic force will be same

Explanation:

given data

separation d = 0.46 nm = 4.6 × $10^{-10}$ m

to find out

electrostatic force between Na+ and Cl− ion

and if sodium ion replace by Li+ and chloride by Br−

solution

we know electrostatic force formula that is

electrostatic force = K ×Q1×Q2 / d² .........................1

here k is coulombs constant that is = 9 × $10^{9}$ and Q1 and Q2 is

charge that is Q1 = + 1.6 × $10^{-19}$ C

and Q2 = - 1.6 × $10^{-19}$ C

so put all these value in equation 1

electrostatic force = K ×Q1×Q2 / d²

electrostatic force = 9 × $10^{9}$ ×1.6 × $10^{-19}$ × -1.6 × $10^{-19}$ / (4.6 × $10^{-10}$ )²

so electrostatic force = 1.08 × $10^{-9}$ N

and if sodium ion replace by Li+ and chloride by Br− then there will be no change in electrostatic force

so magnitude of electrostatic force will be same

3 0

4 years ago

Time is just perception based on how we view change A. Socrates B. John watson C. William james D. None of the above

Lubov Fominskaja [6]

Answer:

C. William James

Explanation:

William James was an American philosopher and psychologist and was considered to be one of the leading thinkers of the nineteenth century. His book "The Principle of Psychology" earned him worldwide recognition.

In the last chapter of this book, he stated that time is nothing but a sensation. He argued that time as a duration is sensed and only influenced on how we view change.

6 0

3 years ago

A typical sugar cube has an edge length of 1 cm. If you had a cubical box that contained a mole of sugar cubes, what would its e

SOVA2 [1]

Since <span>volume of each cube is 1 cm^3
Then we can get the </span>volume of 1 mole of cubes, which is $1 * 6.02 * 10^23 cm^3$
The edge $edge = v^1/3$
And the new adge that we are looking for: $new edge = (6.02*10^23)^1/3$ = $= 1.8191 * 46415888.336 
= 84435142.472 
$
So, the final soution for the edge length of cube is 844km.

Do hope it helps!
Regards.

5 0

3 years ago

What is the force exerted

Norma-Jean [14]

Answer:

I wish i saw the field shown to the right

Explanation:

3 0

4 years ago

You're sitting on a warm granite rock, enjoying the sunshine. You decide it's time to test the water. You take off your shoes an

Morgarella [4.7K]

Answer: seen below

Explanation:

a) Water has the highest specific heat capacity in this case while sand has the lowest specific heat capacity.

b) Sand absorb the least energy for it temperature change (increase or decrease). This means that their temperatures change more quickly due to it low specific heat capacity of 0.290J/g°C) at 25°C)

c) using the formula:

Q = m × cP × (final temperature -initial temperature)

where:

Q = heat

m = is the mass

cP = is the mass heat capacity,

T= is the temperature

Q = 2 kg × 600 J/(kg°C) × (30°C - 20°C)

Q = 12000 J

d) in simpler term, The second law of thermodynamics states that when energy changes from one form to another form, entropy The second law of thermodynamics says that when energy changes from one form to another form, or matter moves freely, entropy (which is a measure of the amount of energy in a physical system that cannot be used to do work) in a closed system increases. This is why your feet gets cold when you put them in the water.

4 0

3 years ago