Hot answers tagged

24

Gemini 2 (unmanned) was filmed for 90 seconds (second link) by an F-4


23

No, quantum mechanics cannot be used to transmit information faster than light. This is a common misconception based on misunderstanding how quantum mechanics works. Go here to read more about it. Technologies like quantum communication are valuable for other reasons though, but they still end up transmitting information at the speed of light, but in a ...


18

There's already two good answers that say a lot of what I wanted to say, and I will refrain from repeating any of their content here. I do think it is useful to add one more item of insight though. You say: "any quantum switch in this universe can be flipped instantaneously from elsewhere." When people talk about a "quantum switch flipping ...


17

tl;dr: There's certainly some propagation of sound waves possible at 100 km altitude. With a density a million times lower than at the surface the mean free path of individual molecules will approach a millimeter, so ultrasonics might be impacted, but for Human or GoPro frequencies it will be much quieter, but still there. Till what altitude above earth ...


16

The Space Shuttle SRBs had cameras, and after sep a falling SRB can clearly be seen falling with its twin. The way they fall in unison is amazing, note the parallel orientations for most of the fall.


13

There are two possible answers to this, although you probably won't like either of them. Answer 1: They don't. Falcon 9 only lands on prepared landing sites and Starship doesn't exist yet. Answer 2: We don't know. Falcon 9 will never land on non-prepared landing sites and Starship iterates so fast that it is impossible to predict what it will look like in 4 ...


12

The title of the question asks Till what altitude above earth sounds can be heard? @uhoh gave a detailed answer to that question. I'll instead speculatively answer an implied question in the body of the OP, What is the sound in the linked video? The OP implicitly assumes the sounds in the video were transmitted through the air to a microphone. (Many ...


10

or maybe just a high-altitude jet Some of the later shuttle launches were filmed from one of the NASA WB-57 aircraft. (personal photo) The nose-mounted camera package didn't produce terrific results IMHO. In addition I did find video of one rocket taken from another. It's not a film of the launch so maybe doesn't qualify ...


7

The largest commercially available width of a roll of stainless steel in the United States is 72 inches. Apparently this is a standard size, and getting something larger would be a custom order, and not quickly and easily available. The vendor Outokumpu (determined by photos of rolls, and the logo found upon them. Very similar to Lucents Brown Ring of ...


7

Launch Mount render: According to SpaceX the total height of Starship Super Heavy is 394 ft / 120 m According to Wikipedia the height of the Starship alone is 160 ft / 50 m My measurements of the render: 181 pixels for Starship upper stage; 428 pixels for Starship Super Heavy; 110 pixels for launch mount. The proportional ...


7

It is not uncommon to film rocket launches from the rocket Probably the most famous rocket tv footage, the Saturn Inner ring.


6

Based on practically proven Quantum-Entanglement principle, any quantum switch in this universe can be flipped instantaneously from elsewhere. Indeed, quantum entanglement can connect (alias entangle) two particles in a way that the change in one particle results in an immediate change in state for the other one. Theories about transmitting information ...


5

The Soyuz rockets, and all R-7 derivative rockets, separate their four liquid booster rockets in unison. Sometime in the past decade, the video feeds of cameras on the core Block A stage have been available showing this stage seperaton and the four boosters falling away from the core stages.


5

Falcon 9 likely could land on a somewhat uneven surface because its leg-base is rather wide and the legs contain one-time-use crush-able aluminum honeycomb impact absorbers. Still, this surface would need to be rather hard and flat to avoid being excavated by the landing engine's exhaust plume and the massive weight of F9 sinking it into the ground too much. ...


3

I know the answer is about 40 minutes but I do not have a source handy. Looking.


3

They are measured in Metric. Kilometers of altitude and Kilometers/hour of speed.


3

There is a great image in this answer. Including it here since there are many components and the image does a nice job of explaining it all. If you want to watch this from a 'birds eye view' you can watch the video SpaceX posted from the Sept 2020 flight for the SAOCOM mission sped up. SAOCOM Launch and Landing


3

Yes, space suit designers exist. For example Final Frontier Design. Also you can see some pictures of their suits, some historic designs and designers themselves at 1, 2 (text in Russian).


3

Concerning a dependence of a thrust from an altitude, solving a similar task I use the barometric formula to get the ambient pressure at given altitude. You can get a difference between known thrust (or specific impulse, if You want) in vacuum (Th1) and at sea level (Th0). This difference dTh = Th1 - Th0 will be multiplied by an altitude-dependent ...


2

While the given answers are very complete, I feel like they are also very complex to understand. So here's my two cents: When two qubits are entangled, they have to be in a "superposition". Practically, this means that they both have a 50/50% chance of being either 1 or 0. The only things we can do with qubits is reset them to zero (which breaks ...


2

I'm going to bang this out in English units because that's what I have a feel for and so am less likely to make an embarrassing mistake. Let's use the thrust equation for non-airbreathing engines, copied from here From the General Thrust Equation towards Tsiolkovsky, how to explain dropping these terms along the way? $ \ \ \ F = \dot{m}_\mathrm e V_\mathrm e ...


2

This is something SpaceX is actively planning. Elon Musk unveiled plans to use Starship for hypersonic passenger transport on Earth all the way back in September 2017, during his "Making Life Multiplanetary" presentation at the International Astronautical Congress. SpaceX even released a promotional video on the concept. More recently in June 2020, ...


1

I'm not aware of any structured courses for a 10 year old, but that doesn't mean they don't exist. In the meantime I would recommend your son watch good quality documentaries, such as those produced by: The BBC Nova National Geographic Anything presented by Neil deGrasse Tyson, such as the 2014 continuation of Cosmos Anything presented by Brian Cox ...


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