a book with a mass of 1 kg is dropped from a height of 3 m. what is the potential energy of the book when it reaches the floor?

Answers

Answer 1

Answer: Well, first of all, the formula for finding potential energy is;
PE=mgh
Where; m is the mass
g is the gravitational force or acceleration due to gravity
h is the height.
Anyway, according to the question, the mass is 1kg, the acceleration due to gravity has a constant value of 10ms² . And the height is 3m. Now you just have to use all these in the formula. So;
mgh= 1 x 10 x 3. That will be 30. And the unit of potential energy is Joule. So the answer is 30 joules. Hope i helped. Have a nice day.

Answer 2

Answer:

Final answer:

A book dropped from a certain height has no potential energy when it reaches the floor, since the height (a factor in the potential energy equation 'PE = mgh') becomes zero.

Explanation:

The potential energy of an object of mass (m) at height (h) is given by the formula PE = mgh, where g is the acceleration due to gravity (approximated as 9.8 m/s² on Earth). In this case, however, when a book reaches the floor after being dropped, its height is 0 meters, hence its potential energy is also 0 joules because potential energy is dependent on height.

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What two factors determine the acceleration of an object

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the total mass and the force exerted on it

What are five types of chemical weathering

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Carbonation, hydrolysis, hydration, oxidation, and solution.

solution,carbonation,hydration,oxidation,and hydrolysis

How to clams get calcium?

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They eat the nutrients from the seaweed in the water.

They began to filter the water around them for calcium.

This is also how they produce the shells , They would collect calcium from the water around and slowly "release loose glue" to push up to the front of the outer layer and it drys to be harder.

I really hope that this helps you out a lot.

V\3. The atomic masses of any two elements contain the same number of _a. atoms
b. grams
c. ions
d. milliliters

Answers

a. atoms

Explanation:

Let's take as example carbon and lead. Carbon have an atomic mass of 12 a.m.u while lead have an atomic mass of 207 a.m.u. Value of atomic masses are the same with as the value of molar masses. So carbon have a molar mass of 12 g/mole while lead have a molar mass of 207 g/mol.

Avogadro's number it tell us that in 1 mole of particular substance there are 6.022 × 10²³ particles. Taking in account this, in 12 g of carbon there are 6.022 × 10²³ carbon atoms and in 207 g of lead there are 6.022 × 10²³ lead atoms atoms.

The atomic mass of any two elements contain the same number of atoms.

Learn more about:

Avogadro's number

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Calculate the mass of barium sulphate formed when 500 cm3 of 1 mol dm sodium sulphate solution is reacted completely with barium chloride solution.[ Relative atomic mass : O = 16; S = 32; Ba = 1371

Answers

Answer:

116.69 g.

Explanation:

Let's write down the reaction taking place when barium chloride reacts with sodium sulfate. This is a double displacement reaction, meaning the anions will be exchanged to produce barium sulfate and sodium chloride:

$BaCl_2(aq)+Na_2SO_4(aq)\rightarrow BaSO_4(s)+2 NaCl(aq)$

Let's find the moles of sodium sulfate. Given the volume of:

$V_(Na_2SO_4)=500 cm^(3)$

Convert this to milliliters knowing that:

$1 mL = 1 cm^3$

Therefore:

$V_(Na_2SO_4)=500 cm^3\cdot (1 mL)/(1 cm^3) =500 mL\cdot(1 L)/(1000 mL) =0.500 L$

Also, we know that:

$1 dm^3 = 1 L$

Convert the molarity into mol/L:

$1 (mol)/(dm^3)\cdot (1 dm^3)/(1 L)=1 (mol)/(L)$

Multiply molarity by volume to find moles of sodium sulfate reacted:

$n_(Na_2SO_4)=1 (mol)/(L)\cdot0.500 L=0.500 mol$

According to stoichiometry of the equation, 1 mole of sodium sulfate produces 1 mole of sulfate, so 0.500 mol of sodium sulfate produce 0.500 mol of barium sulfate. That said, we have moles of barium sulfate produced. To find mass, let's multiply this amount of moles by the molar mass of barium sulfate:

$m_(BaSO_4)=0.500 mol\cdot233.38 (g)/(mol) =116.69 g$

Potassium has an atomic number of 19.Which of a potassium atom's electrons are its valence electrons?
Select one:
a. Those in the third shell from the nucleus.
b. Those in the second shell from the nucleus.
c. Those in the outermost shell.
d. Those in the innermost shell.

Answers

The correct response would be C. Those in the outermost shell, and of highest electron energy are the valence electrons for potassium.

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