una pallina di ferro (d=7.9 x 10al cubo (3) kg/m3 del diametro di 18 mm è immersa in un bicchiere d'acqua. Qual è l'intensità della forza peso e della spinta di archimede sulla pallina?

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

What makes thermal imaging cameras useful? they can detect differences in color. they can detect differences in wave speeds. they can detect differences in temperature. they can detect mechanical waves.

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain