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3 years ago

What best describes how energy changes form in a car’s engine

Physics

2 answers:

Svet_ta [14]3 years ago

6 0

Multiple transformations occur as a result of the chemical energy in the fuel is changed to several forms of energy.

Elena L [17]3 years ago

4 0

Answer: Simplification can be done as:

1) initially we have chemical energy or potential energy in the fuel (it also can be electric energy in some cars)

2) the fuel is combusted, generating thermal energy and a change in pressure that moves pistons, so there is also mechanical energy at this moment.

3) the mechanical energy is used to move the car, so we again have mechanical energy, and some energy is dissipated as heat (this is why a car starts to gain temperature as it travels for a given time) so we again have some thermal energy, some that come from the combustion and some that comes from the motion itself (like friction in inner parts and such)

For the electrical cases, the electrical energy is transformed into mechanical energy and thermal energy directly, there is no combustion.

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If mechanical energy is conserved, then a pendulum that has a potential energy of 20 J at its highest point and 0.5 J at its low

liraira [26]

At the highest point: kinetic energy is 0 due to the speed is 0

So the total mechanical energy is 20

Assume no frictions present, then the mechanical energy is conserved

So at the lowest point, kinetic energy = mechanical energy - potential energy

Answer will be 20 - 0.5 = 19.5 J

4 0

4 years ago

[K1 A2 T1 C1] A golfer strikes a golf ball on level ground.

gregori [183]

Answer:

Explanation:

See the file attached .

b ) Range of projectile

= u²sin2θ / g

= 42² sin32 x 2 / g

= 42² sin64 / 9.8

= 161.8 m

c )

Max height = u² sin²32 / 2 g

= 42² sin²32 / 2x 9.8

= 25.27 m .

6 0

3 years ago

Maryam is driving her car when she glances at the temperature displayed on her dashboard. It says that the temperature is curren

Gre4nikov [31]

Answer: Maryam is driving her car when she glances at the temperature displayed on her dashboard. It says that the temperature is currently 78 degrees outside. This temperature is called a Sensation.

Explanation: To find the answer, we need to know more about the Sensation, perception and psychophysics.

<h3>What is sensation, perception and psychophysics?</h3>

Sensation can be defined as the process by which the physical energy from objects in the world stimulates the sense organs.
The process in which the brain interprets and organizes this sense of information is called, Perception.
The branch of physics that deals with the study of how physical properties of stimuli connected with the people's experience of stimuli is called the Psychophysics.

Thus, we can conclude that, the process of sensation happens here.

Learn more about the Sensation, perception and psychophysics here:

brainly.com/question/28044944

#SPJ4

3 0

2 years ago

Calculate the water pressure in the pipes at the bottom of a high-rise building that is fed by reservoir 60 m above the roof top

yan [13]

P + gh
14 + (9.8)(60) = 602kPa

5 0

3 years ago

Sir Percival and his horse are standing still on a field of honor when Sir Rodney, atop his steed gallops by with a constant vel

Ludmilka [50]

Answer:

d. none of these

Explanation:

From the given information:

Let assume that Percival catches Sir Rodney's horse in time "t" after covering a certain distance "s"

Then, using the second equation of motion:

$S = ut + \dfrac{1}{2}at^2$

FOR Percival, we have:

$S = (0\times t ) + \dfrac{1}{2} \times 0.6 \ m/s \times t^2 \\ \\ S = 0.3 \ m/s \times t^2 -- -- (1)$

FOR Sir Rodney;

$S = ut + \dfrac{1}{2}at^2$

$S = (3\times t ) + \dfrac{1}{2} \times 0 \times t^2 \\ \\ S =3t--- (2)$

Equating both equations together; we have:

0.3t² = 3t

0.3t² - 3t = 0

0.3t(t - 10) = 0

If Percival's position at rest = 0

Then; t = 10 s.

8 0

3 years ago