Una caja de 5.0 kg de masa, rueda por unplano inclinado habiendo un coeficiente de fricción cinética 0.35 entre la caja y el plano. El plano tiene un ángulo de inclinación de 35 grados como se muestra en la figura. La magnitud de la aceleración en m/s2
de la caja en el plano es:

Pistas
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El peso mg se descompone en dos componentes, en la dirección "x" es mg sen del ángulo y en la dirección "y" es -- mg cos del ángulo.

PlantearF neta y = 0 para calcular la magnitud de la fuerza normal y la fuerza de fricción sobre la caja:
n =- mg cos del ángulo = 0 n=? fc= cociente de fricción cinética x n=?

Aplicar la 2da ley de Newton en la dirección x y despejar a : Fneta x = -fc + mg sen del ángulo = m ax. ax=?

Taylor's experiment: 1. accurately measured the speed of light 2. locked together the phases of two light sources so that the interference pattern would not shift 3. showed that man's reaction time was much slower than the speed of light 4. showed that individual photons have wave characteristics

A33.1 g copper object is launched from a 1.5 m 30° steel incline positioned on the floor by being pulled up a string attached to a 50.0 g mass suspended vertically over a pulley. the object is projected towards a glass table where it lands when it is at the point along its trajectory with the lowest speed. it comes to a halt when it clears the opposite edge of the table. it then falls and lands on 9 physics texts each 5 cm thick that are stacked on the floor on the opposite side of the table. assume that the table does not have a ledge and the rectangular object experiences 0.05 n of air resistance as it falls towards the books. how far and how long did the object travel and how fast does it hit the books. assume that at the moment the copper object leaves the incline, the massless string and ideal pulley break off

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?