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General Discussion
Blog: Challenge Questions
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02/01/2014
12:00 AM
Icy Explanation: Newsletter Challenge (February 2014)
Last post:
02/26/2014
1:13 AM
24
4682
01/01/2014
12:00 AM
Brass Plate Heating: Newsletter Challenge (January 2014)
Last post:
01/21/2014
11:47 PM
41
5482
12/01/2013
12:00 AM
Expansive Expansion: Newsletter Challenge (December 2013)
Pathfinder Tags:
challenge questions
Last post:
12/04/2013
12:21 AM
15
2446
10/31/2013
5:01 PM
Spark Safety: Newsletter Challenge (November 2013)
Last post:
12/13/2013
9:49 AM
52
2287
09/30/2013
4:59 PM
A Dicey Problem: Newsletter Challenge (October 2013)
Pathfinder Tags:
challenge questions
Last post:
11/05/2013
9:43 AM
72
3434
09/01/2013
4:59 PM
Particle Mass: Newsletter Challenge (September 2013)
Pathfinder Tags:
challenge questions
Last post:
09/25/2013
2:43 PM
53
2197
07/31/2013
5:01 PM
Rubik's Hypercube: Newsletter Challenge (August 2013)
Pathfinder Tags:
challenge questions
Last post:
08/21/2013
1:19 AM
39
2876
06/30/2013
5:01 PM
Tube Race: Newsletter Challenge (July 2013)
Pathfinder Tags:
challenge questions
Last post:
01/01/2014
12:11 AM
106
5458
06/01/2013
12:00 AM
Time Traveler: Challenge Question (June 2013)
Pathfinder Tags:
challenge question
time travel
Last post:
06/27/2013
8:46 PM
70
5947
05/01/2013
12:00 AM
Dropping the Ball: Newsletter Challenge (May 2013)
Pathfinder Tags:
challenge question
elastic collision
Last post:
06/04/2013
10:30 AM
43
2821
03/31/2013
4:59 PM
Speed Race: Newsletter Challenge (April 2013)
Pathfinder Tags:
challenge questions
Last post:
05/15/2013
9:55 PM
190
5771
03/01/2013
12:00 AM
Candy Conundrum: Newsletter Challenge (March 2013)
Pathfinder Tags:
challenge questions
Last post:
03/14/2013
10:59 AM
36
4225
01/31/2013
12:00 AM
A Balance of Power: Newsletter Challenge (February 2013)
Pathfinder Tags:
challenge questions
weight
Last post:
03/03/2013
2:20 PM
121
4435
01/01/2013
12:00 AM
Roll of the Dice: Newsletter Challenge (January 2013)
Pathfinder Tags:
challenge questions
probability
Last post:
02/01/2013
3:48 PM
100
3969
12/01/2012
12:00 AM
Float Your Boat: Newsletter Challenge (December 2012)
Pathfinder Tags:
boats
challenge questions
Pressure
Water
Last post:
04/14/2017
4:02 AM
109
3882
11/01/2012
8:25 AM
Water Weight: Newsletter Challenge (November 2012)
Pathfinder Tags:
calculations
Pressure
Water
water weight
weight
Last post:
06/07/2013
10:27 AM
138
5098
09/30/2012
12:00 AM
The Case of the Lost Transmission: Newsletter Challenge (October 2012)
Pathfinder Tags:
automotive
challenge questions
electric cars
steam locomotives
Last post:
11/02/2012
2:33 AM
63
4474
09/01/2012
12:00 AM
Sweet Preservative: Newsletter Challenge (September 2012)
Pathfinder Tags:
challenge question
Last post:
11/01/2012
3:51 PM
26
2757
07/31/2012
12:00 AM
Impossible Heights: Newsletter Challenge (August 2012)
Pathfinder Tags:
California redwoods
challenge questions
Last post:
09/08/2012
6:48 AM
115
4456
07/01/2012
12:00 AM
Set the Tone (July 2012)
Pathfinder Tags:
challenge questions
wavelength
Last post:
11/01/2012
7:04 PM
48
3810
06/01/2012
12:00 AM
Keeping Cool: Newsletter Challenge (June 2012)
Pathfinder Tags:
challenge questions
humidity
Last post:
06/19/2012
9:42 AM
29
3082
04/30/2012
4:59 PM
Singing Like Pavarotti: Newsletter Challenge (May 2012)
Pathfinder Tags:
challenge questions
Last post:
05/23/2012
12:20 AM
64
4199
04/01/2012
12:00 AM
Weight of the Hourglass: Newsletter Challenge (April 2012)
Pathfinder Tags:
challenge questions
Last post:
05/06/2012
7:45 PM
300
6775
03/01/2012
4:59 PM
The Case of the Big Spark: Newsletter Challenge (March 2012)
Pathfinder Tags:
challenge questions
Last post:
04/20/2012
3:37 PM
47
5365
02/03/2012
2:19 PM
Polar Bear Fur: Newsletter Challenge (February 2012)
Pathfinder Tags:
challenge question
fur
pigment
polar bear
Last post:
02/22/2012
12:02 AM
20
4618
12/31/2011
12:00 AM
The Rain and the Sea: Newsletter Challenge (January 2012)
Pathfinder Tags:
challenge questions
ocean
rain
waves
weather
Last post:
04/04/2012
1:15 AM
109
6100
12/01/2011
10:46 AM
Earth’s Atmosphere: Newsletter Challenge (December 2011)
Pathfinder Tags:
atmosphere
challenge questions
earth
helium
hydrogen
...
Last post:
02/06/2012
12:21 AM
20
6807
10/31/2011
12:00 AM
Frozen Pond: Newsletter Challenge (November 2011)
Pathfinder Tags:
challenge questions
fish
freezing water
frozen pond
water expands
Last post:
01/04/2012
1:50 PM
113
8740
10/03/2011
10:09 AM
Paramagnetic Behavior: Newsletter Challenge (October 2011)
Pathfinder Tags:
challenge questions
paramagnetic behavior
Last post:
04/03/2012
2:46 PM
14
4292
08/31/2011
5:01 PM
The Floating Superconductor: Newsletter Challenge (September 2011)
Pathfinder Tags:
liquid nitrogen
permanent magnets
superconductor
Last post:
10/02/2011
5:11 AM
18
5830
07/31/2011
5:01 PM
Magnetic Monopole: Newsletter Challenge (August 2011)
Pathfinder Tags:
challenge questions
magnetic monopole
Last post:
08/10/2011
6:57 PM
36
6270
07/01/2011
8:46 AM
Accelerating Spaceship: Newsletter Challenge (07/01/11)
Last post:
10/26/2011
6:44 PM
265
7506
06/01/2011
11:15 AM
Efficient Lamp: Newsletter Challenge (06/01/11)
Pathfinder Tags:
challenge questions
Last post:
12/03/2011
9:00 PM
24
6426
05/01/2011
5:01 PM
X-rays in Crystals: Newsletter Challenge (05/03/11)
Last post:
07/06/2011
9:26 PM
23
6133
04/03/2011
5:01 PM
A Balancing Act: Newsletter Challenge (04/05/11)
Last post:
05/03/2011
5:42 AM
31
5474
02/27/2011
5:01 PM
Too Close for Comfort: Newsletter Challenge (03/01/11)
Last post:
05/05/2011
5:20 AM
134
7360
01/30/2011
5:01 PM
Satellite Mass: Newsletter Challenge (02/01/11)
Last post:
03/10/2011
8:54 AM
117
6759
01/02/2011
5:01 PM
Calculating Machine: Newsletter Challenge (01/04/11)
Last post:
08/02/2011
12:58 PM
116
7776
12/05/2010
5:01 PM
The Remainder: Newsletter Challenge (12/07/10)
Last post:
01/05/2011
12:03 AM
76
5888
10/31/2010
5:01 PM
Marathon Runner: Newsletter Challenge (11/02/10)
Last post:
12/03/2010
10:59 AM
64
5443
10/03/2010
5:01 PM
Rectangular Floor: Newsletter Challenge (10/05/10)
Last post:
11/09/2010
5:42 PM
172
6874
09/05/2010
5:01 PM
Baseball Force: Newsletter Challenge (09/07/10)
Last post:
12/07/2010
1:00 PM
76
5940
08/01/2010
5:01 PM
Peak Electric Field: Newsletter Challenge (08/03/10)
Last post:
09/03/2010
6:44 PM
54
6881
07/04/2010
5:01 PM
Helium Balloon: Newsletter Challenge (07/06/10)
User-tagged by
8 users
Last post:
08/11/2010
3:56 PM
278
9225
05/30/2010
5:01 PM
Sailing: Newsletter Challenge (06/01/10)
User-tagged by
1 user
Last post:
08/04/2010
5:20 AM
401
10938
05/02/2010
5:01 PM
Funny Drag: Newsletter Challenge (05/04/10)
Last post:
07/25/2010
1:59 AM
79
6815
04/04/2010
5:01 PM
Path To The Moon: Newsletter Challenge (04/06/10)
Last post:
04/25/2010
1:49 PM
46
5772
02/28/2010
5:01 PM
Slick Roads: Newsletter Challenge (03/02/10)
Last post:
08/30/2010
11:42 PM
181
9864
02/15/2010
5:01 PM
The Weight Lifter: CR4 Challenge (02/16/10)
Last post:
01/11/2011
1:28 PM
111
3214
02/07/2010
5:01 PM
Banked Highway: CR4 Challenge (02/09/10)
Last post:
08/28/2010
3:14 AM
99
2989
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