Weblog on Physics

Solo di recente sono venuta a conoscenza dell'esistenza dei Dodecaedri Romani. Essi sono considerati misteriosi (Wikipedia) poiché non s...

Il termine diottra (greco dioptra, da diá = attraverso e opteuo = osservo) è in sé riferibile a qualunque strumento munito di uno o più trag...

Da Wikipedia: "La spanna è un'unità di misura antica, che si basa sulla distanza tra le punte del pollice e del mignolo in una mano...

A cannon initially resting on a frictionless surface of mass m 1 = 800 kg (when unloaded) is loaded with a “shot” of mass m 2 = 10.0 kg. T...

A flying squid (family Ommastrephidae) is able to “jump” off the surface of the sea by taking water into its body cavity and then ejecting t...

A 45.0-kg girl is standing on a 150-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionles...

A rifle with a weight of 30 N fires a 5.0-g bullet with a speed of 300 m/s. (a) Find the recoil speed of the rifle. (b) If a 700-N man holds...

A 730-N man stands in the middle of a frozen pond of radius 5.0 m. He is unable to get to the other side because of a lack of friction betwe...

A 40.0-kg child stands at one end of a 70.0-kg boat that is 4.00 m long. The boat is initially 3.00 m from the pier. The child notices a t...