F = ma
1Speed-time graph of a ball turning around *
2Horizontal velocity graph of a ball turning around *
3Force balance across two pivoted rods *
4Westward drift when jumping to different heights *
5Shortest time between two cities with bounded acceleration *
6Work to lift a submerged bucket to the surface *
7Speed change from a slowly moving wall *
8Coins to sample for a precise total weight *
9Flight time to simulate Mars gravity *
10Final spin rate after a stone slides to a disk's rim *
11Ranking fall times of three projectiles *
12Maximum launch speed before a spring platform slips *
13Acceleration directions on a semicircular racetrack *
14Scaling of swim speed with a bacterium's size *
15Ramp angle that minimizes descent time *
16True statements from a velocity-position graph *
17Comparing accelerations of points on clock hands *
18Shape of a smoke plume after a wind gust *
19Gravitational field near a cavity in a planet *
20Speed of the Moon's day-night terminator *
21Ramp angle maximizing a rolling sphere's kinetic energy *
22Angle condition for an icebreaker to submerge ice *
23Period of oscillation on a nonlinear spring *
24Speed reduction for two satellites to meet *
25Fraction of ejected pellets that land back on a planet *
Работа 3
1The Jet Stream
2The Dark Forest
3Great Hall
USAPhO
1A1. Toffee Pudding
2A2. Flashlight
3A3. Electroneering
4B1. Disk Jockey
5B2. Hot Pocket
6B3. The Mad Hatter