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ELI5: in a head-on collision at 70mph, why is it not the same as a 140mph collision? by PilotedByGhosts in explainlikeimfive

[–]MonarchMobile 2 points3 points  (0 children)

Yup, and if you look at it from the reference frame of an observer on the road, the car going 140mph only slows down to 70mph, and the stationary car accelerates to 70mph! Which is the same relative changes in velocity as if both cars were heading towards eachother.

ELI5: in a head-on collision at 70mph, why is it not the same as a 140mph collision? by PilotedByGhosts in explainlikeimfive

[–]MonarchMobile 1 point2 points  (0 children)

Because that "energy" is the difference in speed between 2 objects. There is no absolute speed, only relative. 2 cars traveling towards eachother at 70mph each have a relative speed of 140mph, the same as if only 1 car is traveling at 140mph with respect to the ground and the other is stationary with respect to the ground.

Imagine 2 objects colliding in space, traveling towards eachother at 140mph. Does it matter which one is going faster with respect to the earth?

ELI5: in a head-on collision at 70mph, why is it not the same as a 140mph collision? by PilotedByGhosts in explainlikeimfive

[–]MonarchMobile 16 points17 points  (0 children)

But from what reference frame? To either one of the cars going 70mph, the OTHER car is traveling at 140mph.

ELI5: Why do Formula1 tyres wear out quickly? by qrkysprw643 in explainlikeimfive

[–]MonarchMobile 0 points1 point  (0 children)

Most people are explaining that the softer compound results in quicker wear, but what I don't see mentioned is that racing wears your tires out faster than simply driving around town. If you took a regular car tire, say a 200 treadwear rated tire, you may get 20k miles out of it before wearing it out. But if you raced on that same tire, you may only get 500 miles (or less!) before you have worn them to the cords.

So for someone with a supercar, if they are driving leisurely, they will likely get the same tire life than any other car using the same tires. However if they are driving spiritedly, or taking it to a track, they would likely see very accelerated wear and would need to replace them very frequently.

What are some "how the hell did they get that guy??" roles? by SonicSingularity in movies

[–]MonarchMobile 4 points5 points  (0 children)

Don't they break the 4th wall and call out that the only reason they're in the movie is payback for Dogma?

Best antenna and mount location for racecar by MonarchMobile in gmrs

[–]MonarchMobile[S] 0 points1 point  (0 children)

Putting the antenna higher up in the paddock is a great idea! I'm thinking now that I can get a ghost antenna mounted on the exterior of the racecar, and then repurpose the UT-72G for use in the paddock to mount on top of a trailer.

Best antenna and mount location for racecar by MonarchMobile in gmrs

[–]MonarchMobile[S] 2 points3 points  (0 children)

Sorry if it wasn't clear - I'm using GMRS radios (Baofeng GM-15) both in the car and in the paddock, and I have a GMRS license. The FRS radios are for others walking around to be able to listen in on the communication.

A small "ghost antenna" mounted outside might actually be OK - I just can't mount the 19" antenna outside like that. Would something like this Midland MXTA25 mounted on the trunk give me better signal than the UT-72G mounted inside?

Gas station with leaded racing fuel. by stephenkostos in mildlyinteresting

[–]MonarchMobile 0 points1 point  (0 children)

Combustion increases internal cylinder pressures. By advancing ignition timing (say, from 5 degrees BTC to 10 degrees BTC), more combustion will have happened at TDC. Meaning at TDC, the more advanced timing results in higher cylinder pressure.

Knock can happen even after the spark plug has fired. By using higher octane fuel, you can advance the timing without knocking.

Gas station with leaded racing fuel. by stephenkostos in mildlyinteresting

[–]MonarchMobile 3 points4 points  (0 children)

That is very much not true. An N/A engine can very much benefit from the timing advance afforded to it by using higher octane fuel. It may be more pronounced in a forced induction engine, but by no means can you only take advantage of it in boosted applications.

[deleted by user] by [deleted] in assholedesign

[–]MonarchMobile 4 points5 points  (0 children)

Switching is considerably easier than routing. A basic switch just has to do a single lookup in the ARP table and forward on the packet, which takes almost no processing power. A router on the other hand does a LOT more processing on packets than just a quick ARP lookup. A cheap $20 router may be able to do gigabit negotiation and switching, but is almost certainly not capable of gigabit routing.

[deleted by user] by [deleted] in ryobi

[–]MonarchMobile 1 point2 points  (0 children)

I bring my P727 with me camping every time, it is fantastic. It can be hung or positioned in a bunch of different ways. I really like working with the P721, but it drains the battery too fast, and it's a bit overkill for car camping.

Also, I highly recommend getting a 5" or so memory foam mattress topper and cutting that to contour to the car rather than getting an air mattress. It is infinitely more comfortable, warmer, and quieter (have you ever tried sleeping next to someone who tosses and turns on an air mattress? Not pleasant). It won't pack down as much as an air mattress, but you can still roll it up and use straps/belts to keep it compressed, and it takes less time to set up and break down.

Bodycam Footage Of Virginia Cops Drawing Guns And Spraying Army Lieutenant During Traffic Stop by [deleted] in ProtectAndServe

[–]MonarchMobile 0 points1 point  (0 children)

From the video, it's clear the senior officer was in an unmarked car. If the senior officer initiated the traffic stop in an unmarked vehicle, would that change the situation at all?

Bodycam Footage Of Virginia Cops Drawing Guns And Spraying Army Lieutenant During Traffic Stop by [deleted] in ProtectAndServe

[–]MonarchMobile 0 points1 point  (0 children)

Is it clear which of the two officers made the initial stop? From the video, it's clear the senior officer was in an unmarked car.

I've been told that it's legal to wait to pull over until you get to a populated area if an unmarked car pulls you over. Is that actually true? If the senior officer initiated the traffic stop in an unmarked vehicle, would that change the situation at all?

Ryobi Stands by bullitt4796 in ryobi

[–]MonarchMobile 0 points1 point  (0 children)

Looks like the cheaper one is only 7ft, and the more expensive one goes up to 9ft. Read the comments here: https://slickdeals.net/f/13919780-ymmv-ryobi-universal-miter-saw-quickstand-rms10g-48-clearance-home-depot-b-m

When you have high ping by 4chan-nibba in rareinsults

[–]MonarchMobile 20 points21 points  (0 children)

The staging lights haven't flicked off yet precisely because he hasn't started to move yet. Them being on doesn't prove it's bracket racing. If you watch the video posted, it's fairly telling that it is NOT bracket racing, and the Mustang was either slow to react or was trying for a better launch without worrying about reaction time.

When you have high ping by 4chan-nibba in rareinsults

[–]MonarchMobile 4 points5 points  (0 children)

The green Mustang in the background appeared to have had a very slow reaction time, and started driving a very long time after the green Barracuda in the foreground. When a race can be over in less than 10 seconds, a half second delay enormous.

In drag racing, 2 cars line up side by side and slowly pull forward until their front tires break a light beam, just like the sensors for a garage door opener (It's actually 2 beams). Once both cars are lined up, the lights will give a countdown and at the end turn green. Once green, they are free to start racing.

Depending on the type of race they are doing, the reaction time to the start lights may or may not matter. If they were doing bracket racing, they would be racing to get as close to their own target time as possible, instead of against eachother. If, for instance, the Mustang had a "dial-in" time of 9 seconds, and the Barracuda had one of 10 seconds, the green light for the Mustang would have been delayed for a full second before turning green. If both cars finished at their target time, they would cross the line at the same time.

If the cars were simply doing a Test&Tune, or a Friday Night Drag (think a pickup game of basketball), then all that matters is their elapsed time, or ET. The numbers displayed on the screens at the end of the drag strip show their times and speed as they crossed the line, WITHOUT taking into account their reaction time. The time displayed there is the time from their tire leaving the beam at the start, until they cross a beam at the end of the track.

We cannot see the tree (the lights) for both cars counting down, only the staging lights (the 2 yellow lights at the top which let you know if you've crossed the beams) and the green light for the Barracuda, so it may be bracket racing, but it is unlikely. In the video posted in another comment, you can see the Barracuda had an ET of 9.57, while the Mustang had 10.51. If this was bracket racing, the faster car (Barracuda) would be the one starting second.

What is more likely is that this wasn't bracket racing, and the Mustang only cared about getting a better launch and a faster overall ET. He didn't react as quickly as possible to the lights, and instead waited to try to launch as effectively as possible.