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
o-na [289]
2 years ago
7

8. A car initially has 100 J of total energy. After driving down the road, the car's

Physics
1 answer:
sveta [45]2 years ago
8 0

The work done on the car is -20 J.

Work done on the car is negative, meaning that the car actually does work on the external system.

<h3>Energy and law of conservation of energy</h3>
  • Energy is the ability to do work
  • the law of conservation of energy states that the total energy in a system is conserved

From the law of conservation of energy, the initial energy of the car before it moves down the road remains constant or unchanged.

  • Initial energy = 100 J
  • Initial energy = Final energy - work done on car
  • Final Energy = Work done on car + initial energy

80J = Work done on car + 100 J

Work done on car = 80 - 100J

Work done on car = -20 J

Hence, the work done on the car is -20 J

Work done on car is negative.

Since work done on the car is negative, it means that the car actually does work on the external system. Hence, the decrease in the energy of the car.

Learn more about energy and work at: brainly.com/question/13387946

You might be interested in
Increasing which two things would increase gravitational potential energy?
sukhopar [10]

Answer:

Mass and height

Explanation:

Gravitational potential energy is energy an object possesses because of its position in a gravitational field. The most common use of gravitational potential energy is for an object near the surface of the Earth where the gravitational acceleration can be assumed to be constant at about 9.8 m/s2.

Which is represented as;

PE_g=mgh

PE_g stands for gravitational potantial energy,

m stands for mass of object,

g is the gravitational constant and

h is the height.

Here we see that mass of object and height is directly proportional to the gravitational potential energy.

That means increasing in mass and height will result in increasing gravitational potential energy.

7 0
2 years ago
A rock is dropped from the top of a building. after 4 seconds it is moving at 40 m/s. what was the acceleration of the rock
Marta_Voda [28]
Its moving 10 m/s every sec.
6 0
2 years ago
The light from the Sun heats a metal surface. This is an example of what?
Sedaia [141]
Radiation. That's perhaps the only way that energy gets from the Sun to the earth. The space between the two is a vacuum, so conduction is more or less out as is convection. There's no obvious sign of mirrors, so reflection seems to be out as well.
8 0
3 years ago
Read 2 more answers
2. Après avoir déterminé l'intervalle
SpyIntel [72]

Answer:

i have no idea what this is

Explanation:

8 0
2 years ago
Which set of terms best defines what affects kinetic energy and potential energy, respectively?
aleksley [76]
<span>The correct answer is "velocity, height". Kinetic energy is affected by: mass and velocity, while potential energy by: mass, gravity and height (or "position"). Considering these combinations, only the third choice is the correct one: a) position, gravity describe only potential energy, B) gravity, position describe only potential energy, C) velocity, height describe respectively kinetic and potential energy, D) height, velocity would respectively describe potential energy first and then kinetic energy, it is in the wrong order, thus the correct answer is C.</span>
5 0
3 years ago
Read 2 more answers
Other questions:
  • A ? watcher is a citizen who is paid by the parties to keep a watchful eye on the voters and the officials.
    14·2 answers
  • Sandra is having difficulty with her reading assignment because she does not fully understand the language. Which online tool wo
    11·2 answers
  • Assume that charge −q is placed on the top plate, and +q is placed on the bottom plate of a parallel plate capacitor. What is th
    11·1 answer
  • Which of the following is the best definition of work?
    9·1 answer
  • The current in a hair dryer measures 20.0 amps. The resistance of the hair dryer is 6 ohms. What is the voltage?
    14·1 answer
  • A garden hose is attached to a water faucet on one end and a spray nozzle on the other end. The water faucet is turned on, but t
    8·1 answer
  • Which rock is made mostly of dark, fine-grained silicate minerals, chiefly plagioclase feldspar and pyroxene, and magnetite?
    5·1 answer
  • If light travels 300,000 km/s how long does light reflected from mars take to reach earth when mars is 65,000,000 km away
    10·1 answer
  • How many digits are in front of the decimal in scientific notation?
    9·1 answer
  • HELP PLEASE <br> THANK YOU!!
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!