Un bloque de masa (5 Kg), se desplaza por un plano inclinado con un ángulo de 20°, sabiendo que el coeficiente de fricción entre elplano y el bloque es de 0,3. Determine A)Fuerza normal (N), B)Fuerza de fricción (fr), C)Componente en x del peso (Px), D) Componente del peso en y (Py) y E)la aceleración del sitema (a).

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

the part of the wave he is travelling on is the crest