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
timofeeve [1]
3 years ago
6

During the stage of internal combustion engine operation in which the piston rises and compresses the fuel in the combustion cha

mber,
a. both the intake and exhaust valves are closed.
b. both the intake and exhaust valves are open.
c. the exhaust valve is open and the intake valve is closed.
d. the intake valve is open and the exhaust valve is closed.
Physics
2 answers:
katovenus [111]3 years ago
5 0

The piston rises and compresses the fuel in the cylinder during
the "compression" stroke. 

Both valves have to closed in order to compress the fuel in there. 

If either valve were open, just a crack, then the gases wouldn't get
as compressed as they should ... they'd just get forced out into the
fuel line or the exhaust line through the open valve.

Leokris [45]3 years ago
5 0

your answer is a. both the intake and exhaust valves are closed.

i just took the test

You might be interested in
The third floor of a house is 8m above street level. How much work is needed to move a 136kg refrigerator to the third floor?
jonny [76]

m = Mass of the refrigerator to be moved to third floor = 136 kg

g = Acceleration due to gravity by earth on the refrigerator being moved = 9.8 m/s²

h = Height to which the refrigerator is moved  = 8 m

W = Work done in lifting the object

Work done in lifting the object is same as the gravitational potential energy gained by the refrigerator. hence

Work done = Gravitation potential energy of refrigerator

W = m g h

inserting the values

W = (136) (9.8) (8)

W = 10662.4 J



8 0
2 years ago
Which are heterogeneous mixtures?
inna [77]
C. Sugars dissolved in water
4 0
3 years ago
Which best describes electromagnetic waves moving from gamma rays to radio waves along the electromagnetic spectrum
kondor19780726 [428]

Answer:

Explanation:

No

9 0
3 years ago
the choices below each describe the appearance of an h-r diagram for a different star cluster. which cluster is most likely to b
Kitty [74]

The cluster that is most likely to be located in the halo of our galaxy is the diagram that shows main-sequence stars of every spectral type except O, along with a few giants and supergiants.

<h3>What are star clusters?</h3>

Star clusters are large collections of stars. Star clusters are classified into two types: Globular clusters are gravitationally bound groups of tens of thousands to millions of old stars.

Because of their location on the dusty spiral arms of spiral galaxies, they are sometimes referred to as galactic clusters. Stars in an open cluster share a common ancestor as they all formed from the same massive molecular cloud.

A typical spiral galaxy has a faint, extended stellar halo. A stellar halo is an essentially spherical population of stars and globular clusters thought to surround most disk galaxies and the cD class of elliptical galaxies. It should be noted that a halo is a spherical cloud of stars surrounding a galaxy. Astronomers have proposed that the Milky Way's halo is composed of two populations of stars.

Learn more about star on:

brainly.com/question/21379923

#SPJ1

7 0
1 year ago
The 1.0-kg collar slides freely on the fixed circular rod. Calculate the velocity v of the collar as it hits the stop at B if it
soldi70 [24.7K]

Answer:

6.21 m/s

Explanation:

Using work energy equation then

U_{1-2}=T_B- T_A\\58d-mgh=0.5m(v_b^{2}-v_a^{2})

where d is displacement from initial to final position, v is velocity and subscripts a and b are position A and B respectively, m is mass of collar, g is acceleration due to gravity

Substituting 1 Kg for m, 0.4m for h, v_a as 0, 9.81 for g then

58(\sqrt{0.4^{2}+0.3^{2}}-0.1)-(1\times 9.81\times 0.4)=0.5\times 1\times (v_b^{2}-v_a^{2})\\19.276=0.5\times 1v_b^{2}\\v_b=6.209025688 m/s\approx 6.21 m/s

7 0
3 years ago
Other questions:
  • Why is energy important to motion?
    5·2 answers
  • What is a cool example of newtons 3rd law?
    12·2 answers
  • HURRRY PLEASEEEEE!!!
    11·2 answers
  • (a) Find the energy of the ground state (n = 1) and the first two excited states of an electron in a one-dimensional box of leng
    5·1 answer
  • A football is thrown vertically with an initial velocity of 33m/s. Calculate the velocity of the ball when it’s height increased
    12·1 answer
  • A train travels 120 km at a speed of 60 km/h, makes a stop for 0.5 h, and then travels the next 180 km at a speed of 90 km/h. Wh
    8·1 answer
  • Larry sees a group of people weeping, with frowns on their faces and their eyes turned down. Larry their expressions to understa
    13·1 answer
  • 10. How far did the crate move horizontally?
    14·1 answer
  • After the right string is cut, the meterstick swings down to where it is vertical for an instant before it swings back up in the
    12·1 answer
  • An object that is dropped from a height H falls with a constant acceleration of g. The final
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!