ARS

What is the actual advantage and disadvantage of having an arm-mounted sword (as in a full-size sword mounted on the wrist) versus sword that's held normally on the handle?

Does modern military helmet actually bulletproof enough to resist firearms to prevent headshot or it's limited to just protecting the head from impact and splinters?

So, imagine this scene in an actin movie: You're thrown away, whether by explosion, punch or from being kicked off a helicopter taking off and you landed on the classic "glass roof" on top of the building. The glass is cracked (but didn't break) when you impact it, and now you have to get out of the glass area. Realistically speaking, if the glass is already cracked, which position should be used to get away from it (while minimizing the disturbance that could break the glass): -lay down and slowly crawl away to safety -get on all fours and slowly get away -try to stand on your legs and carefully take each step to get away

Is it possible to reenter the atmosphere stealthily for undetected planetary insertion (to the extent of visual and radar invisibility) with proper controlled deceleration in orbit (and during reentry) to minimize atmospheric friction and heating (that creates a highly visible plasma) with the combination of radar and visual countermeasure (optic camo, anti-radar coating, etc.)

In video games, there's often a case where a different weapon with same type has different attack power despite using same type of bullet. I know this is for the sake of game balance, but what I want to ask, does this kind of difference also true in real life? A same bullet used in 2 different (but same type of gun) has different penetration, force, and destructive power (note: not ballistic properties like trajectory/ grouping, etc.) for example, using .50 cal bullet on different anti-materiel rifle produce a result where one is more powerful than others, or instead, using the same bullet is just as effective as shooting it from different gun

Yeah, I mean larger. The smaller planet has much more mass and stronger gravity than the larger ones

Is it possible for a planet to have a moon that's much larger than it is as long as the planet in question has much more mass (and stronger gravity)? For example, a rogue planet that wanders the universe entered a system and gets captured by a planet much smaller than it (but has much more mass and stronger gravity). Or is there an absolute limit of moon's size related to the parent planet it orbits?

Does the flight trajectory of an object is affected by the rate of acceleration and how the atmospheric drag behaves during the flight? For example, there are 2 projectiles launched into space at suborbital trajectory. Both has the same delta-V, same mass and same angle of launch. However, projectile A is launched normally using rocket engines while projectile B is shot using mass driver. In this case: 1. Projectile A has a gradual acceleration to max speed and atmospheric drag that steadily rises as it flies through atmosphere before it finally reached space 2. Projectile B has instantaneous acceleration to max speed and the atmospheric drag is instantaneously jumped to max before it finally reached space Assuming these 2 have the same delta-V (but different flight characteristic), does the trajectory produced are identical to each other?

If I want to break the speed record, which one of these environment that would put the most and the least strain on the vehicle at high speed? (ignoring the difficulty of attaining high speed in that environment, assume we can go as fast as we want) -sky: flight speed record (vehicle only interact with air) -ground: land speed record (vehicle interact with air and ground) -sea surface: sailing speed record (vehicle interact with water and air) -underwater: submarine speed record (vehicle interact only with water)

I see, thanks for your advice. I'm planning to buy a new PSU at the end of March. Hopefully it would solve my problem

Alright, thanks for the answer

I am planning to buy a new PSU, should 650w enough? Or should I go higher?

@Gargamel thanks

Thanks for the response. Here's my spec: I'm still thinking whether I should: -Increase house voltage to reduce the margin of power fluctuation -Buy a voltage stabilizer with higher range of power output -Buy a UPS (should I use UPS and Stabilizer at the same time?)

Guys, I need some help So I recently bought a PC for my 3D print design and modeling need (because my laptop are no longer sufficient). It's a mid-end computer, and it did it's job properly, however, there are things that's bugging me since I used it. So, the electricity in my house is kinda unstable (but still sufficient), with the voltage frequently rise and fall erratically. Here's what happen: 1. At first, I plugged the power cable of the PC directly into wall socket. The result is, everytime there's a power fluctuation, the computer just freeze, that is, the cursor disappear, any sound stopped and the screen just freeze in place with no way to recover it, necessitating a hard restart 2. Then I bought a voltage stabilizer to at least make the power flow consistent (that was the only conclusion I can gather). The result is, yeah, everytime there's a power fluctuation, the PC no longer frozen in place, as the stabilizer whirrs to stabilize the voltage. However, now it exhibit an annoying habit: Everytime I worked on it, especially those that involves heavy rendering of 3D objects on screen, or doing something intensive that requires heavy GPU use, the PC frequently start to just turned off (screen goes black) and then restart on it's own (without me touching the buttons), often, such event are accompanied by a soft screech from the voltage regulator (p.s the regulator output is 220v, and my PSU range is between 170-230v) Should I increase the power voltage in my house? Is it the problem with PSU? Should I bought UPS? Thanks for the answer, I know this is not a tech support forum, but I'd like to hear your thoughts about it

Could MANPADS locks on grounded aircraft? (Either with engine turned on or not) is there a minimum altitude limit where MANPADS couldn't lock to aircraft? and if the missile is heatseeking type, could it be aimed at tanks with running engine to be used as a makeshift (albeit ineffective) AT missile?

If a stealth aircraft such as F-117 or B2 is taken into WW2 era where the radar is still during it's early age, would it be completely invisible to the radar?

Double that number just in case the yield is less than 1kg

If the outer space treaty said that space isn't really owned by everyone, if colonies are built close to each other, let's say colony A and B are built in such a close proximity, does colony A still have sovereignity claim to what's inside their colony? That is, inside their pressurized structure area, not the soil outside where inhabitants from both are free to place anything outside with no such things as territorial border

@kerbiloid, @monophonic K then. Thanks for the answer

I wanna ask for you who lives in a country with winter season. Which one is better for navigating snowy environment? Wide off-road wheels (chains optional)? or caterpillar track with additional grousers? or heavy duty rotary screw propeller? Does it also effective on wide flat of ice terrain (not soft snow)?

Ah I see. Thanks for the answer

Is there a general rule for when the canard needed in aircraft design? When it's acceptable or just a hindrance when added?

Does a forward swept canard makes sense for high-speed fighter jet? (While the wing are trapezoidal like F-35). Also, what's the impact of the size area of rear horizontal stabilizer when compared with the wing size area? (Aka, the effect of surface area ratio between wing and stabilizer (stabilizer surface area is up to half the wing area))

In a typical scenario of PIT maneuver during police chase, the pursuing police vehicle rams the target vehicle's sides rear from the rear (cars are typically heavier on the front, while the rear is lighter), hopefully to make the target spin out of the control by using it's heavier front as a rotation point. Now, if we take this occurence in an ideal scenario, taking the physics into account, what would happen to the target vehicle and the police vehicle if: 1. The target's rear is as heavy as the front (no lighter or heavier side) 2. The target's overall weight is much heavier than the front of police vehicle 3. The target has a rear mounted engine (meaning the rear that's getting rammed is the heavier side while the front is the lighter side)