Water thrown from a wet tennis ball forms spiral streams as each droplet starts out with the tangential velocity of the surface plus some radial velocity. Droplets that leave the same location on the sphere a bit later have rotated a bit further and start with a slightly rotated velocity vector, resulting in spiral streams.
Water thrown from a wet tennis ball forms spiral streams as each droplet starts out with the tangential velocity of the surface plus some radial velocity. Droplets that leave the same location on the sphere a bit later have rotated a bit further and start with a slightly rotated velocity vector, resulting in spiral streams.
A jet of water striking a solid sheet at an angle does not reflect, but creates a circular pool, like an impact crater.
A jet from a high pressure water pistol striking a solid sheet at an angle does not reflect, but creates a circular pool, like an impact crater.
Video at 3000 frames per second reveals the periodic motion of lips and cheeks during the type of ‘buzz’ used by trumpet players (and inspired here by a jet from a water pistol).
High speed video at 3000 fps reveals a hemispherical dome formed during the splash from a 1 inch bolt dropped into water.
