Una molla di costante elastica 57 N/m è lunga 15 cm. Appendendo alla molla un cilindro di metallo la molla si allunga fino a 21 cm.
a) Disegna la molla scarica e la molla con il peso agganciato.
b) Inserisci i dati nel disegno.
c) Quanto vale l'allungamento della molla?
d) Quanto vale il peso del cilindro?
e) Di quanto si allunga la molla se appendiamo un peso di 9,5 N?

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?

At what time will the interfering waves have an amplitudeof zero?

Atriangle with equal sides of length 10 cm has -2.5-nc charged objects at each corner. part a determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. horizontally rightward vertically downward vertically upward horizontally leftward