Web Paint-by-Number Forum
Comments on Puzzle #30621: Classical Physics Problem
By Brian Bellis (mootpoint)

peek at solution       solve puzzle
  quality:   difficulty:   solvability: moderate lookahead  

Puzzle Description Suppressed:Click below to view spoilers

#1: Brian Bellis (mootpoint) on Dec 11, 2017 [SPOILER]

Comment Suppressed:Click below to view spoilers
#2: Brian Bellis (mootpoint) on Dec 11, 2017 [HINT]
The hunter's pith helmet is the only sticking point in this solve. I had to guess and check on row 11 until I reached a contradiction then guess again.
#3: Wombat (wombatilim) on Dec 11, 2017 [HINT]
After line and color logic, this is what I did:

If R17C3 is black, it causes a contradiction in C7. LL.
If R16C3 is black, it means C1 is in R8-9, which in turn causes a contradiction in R17.

LL solves the rest.
#4: Aurelian Ginkgo (AurelianGinkgo) on Dec 11, 2017 [SPOILER]
Comment Suppressed:Click below to view spoilers
#5: Norma Dee (norm0908) on Dec 11, 2017
When I Googled the problem the example they used was a blow gun, which made the explanation easier to understand. But I am assuming that when you say gun, you mean a rifle as a shotgun wouldn't make much sense. Wouldn't the tremendous difference in speed between a bullet and a dart change things a bit? Unless it's a sniper firing from a mile or more away, if your aim is right with a rifle, you pretty much have one dead monkey an instant after the trigger is pulled and the discussion about the effects of gravity on falling objects wouldn't apply.
#6: Kristen Vognild (kristen) on Dec 11, 2017 [HINT] [SPOILER]
Comment Suppressed:Click below to view spoilers
#7: Norma Dee (norm0908) on Dec 11, 2017
A blow dart averages 400 ft per second compared to the average rate of a bullet of 2,500 feet per second.
#8: Brian Bellis (mootpoint) on Dec 11, 2017 [SPOILER]
Comment Suppressed:Click below to view spoilers
#9: JoDeen Mozena (ozymoe) on Dec 12, 2017 [SPOILER]
Comment Suppressed:Click below to view spoilers
#10: Brian Bellis (mootpoint) on Dec 12, 2017
No, gravity pulls the bullet down from its straight line path at the same rate as the monkey. The only thing that messes with this is if the spinning bullet gets some lift and flies.
#11: JoDeen Mozena (ozymoe) on Dec 12, 2017 [SPOILER]
Comment Suppressed:Click below to view spoilers
#12: Joe (infrapinklizzard) on Dec 13, 2017 [HINT]
ll/cl
three-way logic on the 1 in c7 - no matter whether it is in r11, 12, or 13, c3r11 will be white.

three-way logic on the 1 in r17 - no matter whether it is in c1, 2, or 3, r13c1 will be white.

ll to finish
#13: Web Paint-By-Number Robot (webpbn) on Dec 13, 2017
Found to be solvable with moderate lookahead by infrapinklizzard.
#14: Joe (infrapinklizzard) on Dec 13, 2017 [SPOILER]
Comment Suppressed:Click below to view spoilers
#15: JoDeen Mozena (ozymoe) on Dec 14, 2017
Thanks, Brian and Joe. It finally sank in!
#16: Belita (belita) on Jan 2, 2018
My high school physics teacher actually demonstrated this using an air rifle and a teddy bear. But he had the gun aiming straight across the room from the bear. This picture shows the gun aiming up at the monkey, and surely that would throw off the whole thing.

Show: Spoilers

Goto next topic

You must register and log in to be able to participate in this discussion.