Which statement best describes why a machine is useful?

Hello. This question is incomplete. The full question is:

"Which statement best describes why a machine is useful?  A-A machine does a greater amount of work than the amount of work that is done on it.  B-A machine does a smaller amount of work than the amount of work that is done on it.  C-A machine can decrease both the input force and the input distance needed to do a given amount of work.  D-A machine can decrease either the input force or the input distance needed to do a given amount of work."

D-A machine can decrease either the input force or the input distance needed to do a given amount of work.

Explanation:

A machine is a device that uses energy and work to achieve a predetermined goal. In Physics, any device that changes the direction or intensity of a force with the use of work. In summary, we can say that what best describes why a machine can decrease the input force or the input distance needed to perform a certain amount of work, for this reason, the machine is useful.

depends on what you mean by "group." for order, it would be coleoptera (beetles). for class, it would be insecta (insects). for phylum, it would be the arthropoda (animals with jointed exoskeletons).

explanation:

the tires are rotating at 0.434 rpmlinear speed=45 m/sdiameter=0.550 mradius=0.275 mnow v= rωω= v/rω=45/0.275ω=163.6 rad/sω=163.6 rad/s (1rev/2π rad) (60s/1m)ω=1563 rpm