1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Zanzabum
3 years ago
5

Identify each energy exchange as primarily heat or work and determine whether the sign of ΔE is positive or negative for the sys

tem. a. A rolling billiard ball collides with another billiard ball. The first billiard ball (defined as the system) stops rolling after the collision. b. A book falls to the floor. (The book is the system). c. A father pushes his daughter on a swing. (The daughter and the swing are the system)
Chemistry
1 answer:
Semmy [17]3 years ago
8 0

Answer:

a. Work, ΔE is negative;

b. Work, ΔE is negative;

c. Work, ΔE is positive.

Explanation:

In the three cases, there is energy exchange in primarily work. The heat is the energy flow because of the difference in temperature. Of course, some heat may be lost in the cases by dissipation.

In the letter <em>a</em> the system is at an initial velocity different from 0, and then it stops. The energy that is represented here is the kinetic energy, which is the energy of the movement. Note that the system goes from a higher velocity to 0, so it is losing kinetic energy, or work, so ΔE = Efinal - Einitial < 0.

In letter <em>b</em>, the system is falling from a certain high to the floor, so its gravitational potential energy is change. That potential energy represents the energy that gravity does when an object shifts vertically. Because it goes from a high to 0, the energy is been lost, so ΔE = Efinal - Einitial < 0.

In letter <em>c</em>, the system is going higher and with higher velocity, so there is a greatness in the gravitational potential energy and the kinetic energy, both works, so ΔE = Efinal - Einitial > 0.

You might be interested in
Name the following ketone:
alekssr [168]
A. cyclohexyne is the answer
5 0
3 years ago
If half of the moon is always illuminated why does its appearance from earth change?
irina [24]

Answer:

The different angles the moon has from sunlight to the earth

Explanation:

3 0
3 years ago
Read 2 more answers
Help please all please
Luden [163]

Answer:

I don’t want to download a pdf that I don’t know what it is…

Also, brainly strictly says that we can’t post questions about a test or quiz that is found in school…

Explanation:

5 0
3 years ago
Read 2 more answers
How can you tell that a white powder is salt without tasting it?
ZanzabumX [31]

You can detect salt in water without tasting by measuring the density of the water. Place a glass of spring water and a glass of the suspected salt water on a balance scale and the heavier one contains salt. Other ways to test for salt in water is to put a drop of water on the end of a nail and place in a gas flame. If the water contains salt, the flame will turn a yellow/orange color.

7 0
3 years ago
What happens when an electron jumps energy from energy level 3 energy level 6 in an atom
Alik [6]

Explanation:

high energy to Low energy

=the electron gains energy (K.E)

4 0
2 years ago
Other questions:
  • What is the difference between an ion and an isotope?
    12·1 answer
  • A sealed can with an internal pressure of 721 mmHg at
    10·1 answer
  • Who was the first hispanic justice of the United States Supreme Court
    14·2 answers
  • Place the following compounds in order of increasing vapor pressure. methane, CH4; pentane, CH3CH2CH2CH2CH3; 1-propanol, CH3CH2C
    5·2 answers
  • What metal is oxidized in the most common dry cell
    8·1 answer
  • Can a window pane be considered a mineral?
    13·2 answers
  • An engineer chooses to use bamboo as a building material because it grows
    15·2 answers
  • The energy released in cellular respiration was originally present in ____________
    5·1 answer
  • Releases energy in the form of ATP
    15·1 answer
  • Pls I need help! I need answer and explanation.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!