Three phases
At takeoff, the ICBM enters the boost phase. During this phase, the rockets send the ICBM into the air, pushing it upward for about 2 to 5 minutes, until it reaches space, Coyle said. ICBMs can have up to three rocket stages. Each one is discarded (or ejected) after it burns out. In other words, after the first stage stops burning, rocket No. 2 takes over, and so on.
Moreover, these rockets can have liquid or solid propellant. Liquid propellants "generally burn longer in the boost phase than solid-propellant rockets [do]," Coyle said. In contrast, solid propellants "provide their energy in a shorter amount of time and burn faster."
Liquid and solid propellants can send rockets equally far, "but most countries start out with liquid propellant technology because it's well understood," Coyle said. "[As] they graduate, they move to solid propellant to get the faster burn times. It also avoids the hazards of dealing with dangerous liquids that are both flammable and toxic."
In the second phase, the ICBM enters space as it continues on its ballistic trajectory. "It's flying through space very fast, maybe 15,000 mph or 17,000 mph [24,140 or 27,360 km/h]," Coyle said. "It's taking advantage of the fact that there's no air resistance out there."
Some ICBMs have technology that allows them to take a star shot — that is, they can use the location of the stars to help them better orient toward their target, Coyle said.
In the third phase, the ICBM re-enters the atmosphere and hits its target within minutes. If the ICBM has rocket thrusters, it might use them to better orient itself toward its target, Coyle said. However, because of the intense heat encountered when they re-enter the atmosphere, ICBMs can burn up and fall apart unless they have proper heat shields, Coyle noted.
For the Hwasong-15, the entire trajectory took 54 minutes, significantly longer than North Korea's 37-minute test on July 4, 2017, and its 47-minute test on July 28, 2017, Wright wrote on his blog.
Folks I have a theory which I would like you to look into. The recent tragedies which occured in Itbayat, Batanes where 9'died and 60 were injured, together with the destruction of heritage sites, plus the capsizing of boats in the sea between Guimaras and Iloilo where 31 died, have made me ponder the role of North Korean firing of missiles recently.
On July 25, 2019, North Korea fired two missiles which traveled 690 kilometers. It landed in the sea of Japan.
After two days, Juky 27, 2019, at 4:16 am, Batanes suffered from that disastrous earthquake.
Then on the 31st of July, and the 2nd of August, 2019, North Korea fired missiles again.
August 3rd, a squall happened which caused three passenger boats to capsize on that strait between Guimaras and Iloilo.
The closeness of the dates of the events makes me think if the missiles which enter the atmosphere and can land with tremendous thunder on the sea could have causedthe disasters that affected us.
Now let us asko the DOST to provide us a scientific view of why these environmental disasters are happening to us and to link the connections between the use of missiles and their effects on the atmosphere and the environment. I am not a scientist and have limited knowledge of how missiles work. But when people die and cultural relics are destroyed, it is time for us to speak up, firing missiles is no lo ger funny, don't you think?
Please read below a description of what happens when an intercontinental ballistic missile as North Korea uses,
From livescience.com
"Three phases
At takeoff, the ICBM enters the boost phase. During this phase, the rockets send the ICBM into the air, pushing it upward for about 2 to 5 minutes, until it reaches space, Coyle said. ICBMs can have up to three rocket stages. Each one is discarded (or ejected) after it burns out. In other words, after the first stage stops burning, rocket No. 2 takes over, and so on.
Moreover, these rockets can have liquid or solid propellant. Liquid propellants "generally burn longer in the boost phase than solid-propellant rockets [do]," Coyle said. In contrast, solid propellants "provide their energy in a shorter amount of time and burn faster."
Liquid and solid propellants can send rockets equally far, "but most countries start out with liquid propellant technology because it's well understood," Coyle said. "[As] they graduate, they move to solid propellant to get the faster burn times. It also avoids the hazards of dealing with dangerous liquids that are both flammable and toxic."
In the second phase, the ICBM enters space as it continues on its ballistic trajectory. "It's flying through space very fast, maybe 15,000 mph or 17,000 mph [24,140 or 27,360 km/h]," Coyle said. "It's taking advantage of the fact that there's no air resistance out there."
Some ICBMs have technology that allows them to take a star shot — that is, they can use the location of the stars to help them better orient toward their target, Coyle said.
In the third phase, the ICBM re-enters the atmosphere and hits its target within minutes. If the ICBM has rocket thrusters, it might use them to better orient itself toward its target, Coyle said. However, because of the intense heat encountered when they re-enter the atmosphere, ICBMs can burn up and fall apart unless they have proper heat shields, Coyle noted.
For the Hwasong-15, the entire trajectory took 54 minutes, significantly longer than North Korea's 37-minute test on July 4, 2017, and its 47-minute test on July 28, 2017, Wright wrote on his blog."
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