All categories

2 years ago

A book is falling from the top shelf of a bookcase. Which statement correctly describes the change in the energy of the book?

Chemistry

2 answers:

olchik [2.2K]2 years ago

8 0

Answer: Option (B) is the correct answer.

Explanation:

When the book was at the shelf, it had only potential energy as potential energy is the energy possessed due to the position of an object.

Therefore, when the book falls from the book shelf it gains kinetic energy as kinetic energy is the energy possessed due to the motion of an object.

Thus, when the books is falling from the top shelf then the motion of book increases therefore, we can conclude that the potential energy decreases as kinetic energy increases.

Effectus [21]2 years ago

3 0

Answer:

Explanation:

I took the test

You might be interested in

The ionic equations represent the reactions between four metals, P, Q, R and S, and solutions of the salts of the same metals

EleoNora [17]

Answer:

P + Q2+ -> no reaction

R + P2+ -> R2+ + P

Q + S2+ -> Q2+ + S

S + P2+ -> S2+ + P

S + R2+ -> S2+ + R

S + Q2+ -> no reaction

What is the correct order of reactivity of the metals?

Most -----------------------> least

A. P R S Q

B. Q R S P

C. Q S R P

D. S Q P Rhhgu

5 0

3 years ago

1. john needs to create a buffered solution at a ph of 3.5 for his biomedical laboratory

Lunna [17]

Answer:

Use a ratio of 0.44 mol lactate to 1 mol of lactic acid

Explanation:

John could prepare a lactate buffer.

He can use the Henderson-Hasselbalch equation to find the acid/base ratio for the buffer.

$\text{pH} = \text{pK}_{\text{a}} + \log\dfrac{\text{[A$^{-}$]}}{\text{[HA]}}\\\\3.5 = 3.86 + \log\dfrac{\text{[A$^{-}$]}}{\text{[HA]}}\\\\\log\dfrac{\text{[A$^{-}$]}}{\text{[HA]}} = 3.5 - 3.86 = -0.36\\\\\dfrac{\text{[A$^{-}$]}}{\text{[HA]}} = 10^{-0.36} = \mathbf{0.44}$

He should use a ratio of 0.44 mol lactate to 1 mol of lactic acid.

For example, he could mix equal volumes of 0.044 mol·L⁻¹ lactate and 0.1 mol·L⁻¹ lactic acid.

6 0

2 years ago

What atom has 5 neutrons 4 protons and 2 electrons

Vilka [71]

<span>the atom that has these characteritics is called beryllium nucleus</span>

6 0

2 years ago

A car travels a constant speed of 60 Km/h for 3 hours what is the total distance the car has traveled?

ohaa [14]

Answer:

180 miles

Explanation:

60 × 3 = 180

[character limit pass]

7 0

2 years ago

Give the name of this alcohol.

solong [7]

Answer:

An alcohol is an organic compound with a hydroxyl (OH) functional group on an aliphatic carbon atom. Because OH is the functional group of all alcohols, we often represent alcohols by the general formula ROH, where R is an alkyl group. Alcohols are common in nature.

Explanation:

3 0

2 years ago