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lana66690 [7]
3 years ago
9

Powered ventilation systems should be turned on for how many minutes before starting the engine to ensure all gasoline vapors ha

ve been removed before ignition?
Physics
2 answers:
stepan [7]3 years ago
8 0

Answer:

Minimum of four minutes.

Explanation:

The essence of this is to avoid explosions by removing flammable gases due to reaction with sufficient oxygen. Evaporation of gasoline creates vapors or fumes that are denser than air which would settle to the bottom of a vessel and cause explosion if enclosed areas are not properly ventilated to remove the fumes.

Verizon [17]3 years ago
3 0
I really don’t undagaujsndwj
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The sun appears to move through the background stars. This apparent motion would not exist if:_________.
otez555 [7]

Answer:

b) the earth did not orbit the sun

Explanation:

The sun appears to move through the background stars due to parallax . Parallax is a phenomenon when the near object appears to move faster than the distant object . If we travel in a train , the near object like electric poles on rail track or trees and fields nearby appear to move faster against the distant background .

Hence when the earth moves around the sun , the sun appears to move against the background the stars which are far away . Had earth remained stationary at a place on its orbit around the sun , the sun would have appeared stationary against the background the   stars .

3 0
3 years ago
The number of molecules in a container is tripled and the kelvin temperature doubled. the volume remains unchanged. the new pres
Nonamiya [84]
N2 = 3*n1
T2 = 2*T1
V1 = V2

(n2 * T2)/P2 = (n1 * T1)/P1
3 n1 * 2 T1 / P2 = n1 *T1 / P1
P2 = 6*P1

Since P2 is 6P1, it is 6 times greater than original pressure
3 0
3 years ago
What type of heat transfer is used in a restaurant that uses ovens with fans inside?
Marina CMI [18]

convection


please mark brainliest any other problems or questions feel free to ask


5 0
3 years ago
A certain white dwarf star was once an average star like our Sun. But now it is in the last stage of its evolution and is the si
solmaris [256]

Answer:

4.384 * 10^13

Explanation:

Given the expression :

[(6.67 * 10^-11) * (1.99 * 10^30)] ÷ [(1.74*10^3)*(1.74*10^3)]

Applying the laws of indices

[(6.67 * 1.99) *10^(-11 + 30)] ÷ [(1.74 * 1.74) * 10^3+3]

13.2733 * 10^19 ÷ 3.0276 * 10^6

(13.2733 / 3.0276) * 10^(19 - 6)

4.3840996 * 10^13

= 4.384 * 10^13

6 0
2 years ago
20 Points available for physics help
Sonja [21]
The second one is correct not sure about the first one sorry
8 0
3 years ago
Read 2 more answers
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