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
zvonat [6]
2 years ago
11

Describe why cars are inefficient machines in terms of thermodynamics.

Physics
2 answers:
WARRIOR [948]2 years ago
8 0

Cars are inefficient by the fact that they convert fuel (chemical energy) to mechanical energy, only 30-40% of that energy can be converted to move the car.

Since Thermodynamic is basically about the conversion of energy, cars are inefficient since something has to be able to convert at least 50-75% of the energy to be efficient.

Alina [70]2 years ago
6 0

Cars are the mechanical device which convert chemical energy of fuel into mechanical energy, the engine used in the automobiles car are very inefficient, they can only convert 30-40% of chemical energy of fuel into mechanical energy, since thermodynamics is the branch of science that deals with the conversion of energy, thus due to poor conversion rate of chemical energy into mechanical energy, cars are known as inefficient machine.

You might be interested in
Coders play an important role in
Burka [1]

Answer:

it is a.health record documentation

Explanation:hope this helps

3 0
3 years ago
A quantity of a gas has an absolute pressure of 400 kPa and an absolute temperature of 110 degrees kelvin. When the temperature
shepuryov [24]

You can make sure there's no change in volume by keeping
your gas in a sealed jar with no leaks.  Then you can play with
the temperature and the pressure all you want, and you'll know
that the volume is constant.

For 'ideal' gases,

       (pressure) times (volume) is proportional to (temperature).

And if volume is constant, then

                 (pressure) is proportional to (temperature) .

So if you increase the temperature from 110K to 235K,
the pressure increases to  (235/110)  of where it started.

     (400 kPa) x (235/110)  =  854.55 kPa. (rounded)

Obviously, choice-b is the right one, but
I don't know where the .46 came from.
 
4 0
3 years ago
The time that an object takes to complete its orbit once around the sun
Naya [18.7K]

The farther away an object is from the Sun the slower it orbits around it. The closer an object is from the Sun the faster it orbits around it.

4 0
3 years ago
An electron is accelerated by a 3.6 kv potential difference. the charge on an electron is 1.60218 × 10−19 c and its mass is 9.10
katen-ka-za [31]
By definition, the potential energy is:
 U = qV
 Where,
 q: load
 V: voltage.
 Then, the kinetic energy is:
 K = mv ^ 2/2
 Where,
 m: mass
 v: speed.
 As the power energy is converted into kinetic energy, we have then:
 U = K
 Equating equations:
 qV = mv ^ 2/2
 From here, we clear the speed:
 v = root (2qV / m)
 Substituting values we have:
 v = root ((2 * (1.60218 × 10 ^ -19) * 3600) /9.10939×10^-31))
 v = 3.56 × 10 ^ 7 m / s
 Then, the centripetal force is:
 Fc = Fm
 mv ^ 2 / r = qvB
 By clearing the magnetic field we have:
 B = mv / qr
 Substituting values:
 B = (9.10939 × 10 ^ -31) * (3.56 × 10 ^ 7) / (1.60218 × 10 ^ -19) * 0.059
 B = 3.43 × 10 ^ -3 T
 Answer:
 
A magnetic field that must be experienced by the electron is:
 
B = 3.43 × 10 ^ -3 T
6 0
2 years ago
Choose all that apply. Which of the following questions could you answer by measuring length? 1 How tall are you? 2How far is it
horsena [70]

The correct options are:

1 How tall are you?

2How far is it from your house to your school?

3How wide is your refrigerator?

All these measurements involve to measure a length. Instead, the other two options involve to measure different physical quantities; for instance, the question

4 How much does your sister weigh?

Involve to measure a weight (and so, a mass), while the question

5 How warm is it in San Diego?

requires to measure a temperature.

8 0
3 years ago
Other questions:
  • Calculate the wavelength of the electromagnetic radiation required to excite an electron from the ground state to the level with
    5·2 answers
  • If the statement is true, select True. If it is false, select False.
    12·1 answer
  • How should you draw the field lines for Earth's magnetic field?
    10·2 answers
  • A broom with a long handle balances at its centre of gravity as shown in the figure. If you cut the broom into two parts through
    5·1 answer
  • A square coil ℓ = 2cm on a side with 30 turns rotates in a uniform magnetic field, B~ = B0zˆ = 0.1Tˆz, such that the normal of t
    6·1 answer
  • What is used to create the sequential order of elements?
    6·2 answers
  • Conclusions related to historical events are limited to subjective evaluation of the existing evidence because _____.
    14·1 answer
  • An object change in position according to its reference point is called
    11·2 answers
  • A body accelerate uniformly from rest at 2m/s square.Calculate its velocity after traveling 9m
    7·1 answer
  • ______ interference occurs when two waves are out of phase.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!