Right

Wrong

n/2

n

n - 1

n(n - 1)/2

?x

?²x

?²/x

?³/x

balancing partially revolving masses

balancing partially reciprocating masses

best balancing of engines

all of these

The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another

The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only

A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work

all of the above