The collar of mass m slides on the rough horizontal shaft under the action of the force f of constant magnitude f ≤ mg but variable direction. if ! = kt where k is a constant, and if the collar has a speed v1 to the right when ! = 0, determine the velocity v2 of the collar when ! reaches 90°. also determine the value of f which renders v2 = v1.

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.

3.2x10^7

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.