A161-kg block is pulled at a constant speed of 7.40 m/s across a horizontal floor by an applied force of 138 n directed 36° above the horizontal. what is the rate at which the force does work on the block?

510.6 W

Explanation:

The rate at which the force does work is called power therefore it is given by:

The instantaneous power applied on a rigid solid is given by the product of the constant force applied over the solid's velocity.

Here is the angle between the force and the velocity.

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.

probably not if net force is zero