☔ Stay Dry — Explore

Lift your hand to block the rain
Starting camera…
● Hand Lost
Status
🤚
Raise your hand!
🤚

Raise your hand or an umbrella
above your head to block rain

Adjust the Rain

10 m/s
30°

☔ Stay Dry — Challenge

Score: 0
Simulation Mode
Vr:— θr:—° Vp:—m/s
Status
☀️
Waiting…
Score
0
Vector Diagram
Vr — Rain velocity
Vp — Person velocity
Vrp — Apparent rain
Umbrella axis
Your umbrella angle
—

+ forward, − backward

Correct answer
Hidden

Revealed after submit

Apparent rain speed
—

Magnitude of Vrp

🌧 Physics Challenge

At what angle should you hold your umbrella?

Vrp,x = Vr·sin(θ) − Vp = ?
Vrp,y = Vr·cos(θ)       = ?
θumbrella = atan2(Vrp,x , Vrp,y) = ?°
°