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USAPhO 2022

Теоретический тур

PDF организаторовВсе заданияВсе решения
1Take Five
2Chain Reaction
3Lego Movie

Работа A

PDF организаторовВсе заданияВсе решения
1Maximum height from height at half speed *
2Speed hitting an obstacle at a higher initial speed *
3Percent kinetic energy lost in an inelastic collision *
4Trajectory after a pendulum string breaks *
5Total kinetic energy of a rolling ball *
6Maximum tension in a pendulum released horizontally *
7Functional form from a measurement graph *
8Friction force from the ground on a wedge *
9Comparing forces to raise a mass at velocity and acceleration *
10Oscillation period of a rod hung by two strings *
11Minimum launch speed to reach a neighboring planet *
12Force ratio on masses from a two-radius pulley *
13Minimum force to tip a locked laptop *
14True statements about a block sliding in a bowl *
15Optimal angle for a projectile to hit a wall highest *
16Minimum friction for a pushed pencil to roll *
17What must be equal between two halves of a spinning rod *
18Water height when a cork begins to float *
19Hydrostatic force on a submerged toy with sealed legs *
20Wire shape with zero normal force on a bead *
21Cork height in a damped fluid during elevator motion *
22Downward acceleration of a block on two wedges *
23Comparing fall times with linear and quadratic drag *
24Orbit area from a satellite's speed at apoapsis *
25Minimum friction for a rubber band on a cylinder *

Работа B

PDF организаторовВсе заданияВсе решения
26Distance between bounce points on a 45-degree slope *
27Moments of inertia of a four-mass wheel about different axes *
28Balancing mass after moving a seesaw's fulcrum *
29Shape formed by firework shells over time *
30Average speed of a round trip with a river current *
31Momentum of a heavier block pushed the same way *
32Scale reading while pulley masses are falling *
33Launch angle for a ball to bounce twice and return *
34Minimum force to slide a box pushed at an angle *
35Force to stretch a combination of three springs *
36Pressure force on a cup with a tied floating block *
37Minimum friction to hold two roped bricks on a slope *
38Maximum height of a ballistic pendulum with rotation *
39Surface area and volume after a cylinder splits into droplets *
40Which thrust direction keeps the same faster orbit *
41Effective point of a normal force on an inclined block *
42Timing between a puck's wall collisions in a sliding box *
43Oscillation frequency of a rod on two springs *
44Rotational oscillation frequency of a rod on two springs *
45Acceleration of a hollow sphere on an accelerating plane *
46Comparing uncertainty in a rectangle's area and perimeter *
47Launch angles for a projectile to never hit its planet *
48Velocity-acceleration curve of simple harmonic motion *
49Kinetic energy gained sliding down a moving ramp *
50Collision time scaling for heavier attracting masses *

Экспериментальный тур

PDF организаторовProblemSolution
4The Future Circular ColliderУсловиеРешение
PDF организаторовВсе заданияВсе решения
1A1. Moment of Clarity
2A2. Death Metal
3A3. Rainbow Road
4B1. Virial Reality
5B2. Broken Vase
6B3. Time Crystal