What is the efficiency of the
machine if the input is 263 J and
the output is 142 J?

Explanation:

Efficiency of a machine = (output / input ) × 100%

Efficiency =(142/263)×100= 54%

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.

which three statements are true about all alloys?