Answer:
Revolution of moon around the earth
Explanation:
The revolution of moon around the earth.
The gravitational force acting on the moon is balanced by the centripetal force acting on the moon.
Gravitational force of earth on moon is given by
where, M be the mass of earth, m be the mass of moon and r be the distance between moon and earth.
The centripetal force acting on moon is
These two forces balance each other and then the moon revolves around the earth in fixed orbit.
The work done by the engine is converted into kinetic energy of the motorbike+rider system:
where
W=6400 J is the work
m=200 kg is the mass of the system
v is the speed acquired by the motorbike
Rearranging the equation and substituting the numbers in, we find
Answer:
work output is always less than work input - the ratio is less than 1.
Explanation:
This principle comes from the fact that a machine or system cannot produce more work than is supplied to it, because this would violate the energy conservation law (work is a type of mechanical energy).
In theoretical machines called "ideal machines" the input work is the same as the output work, but these machines are only theoretical because in real applications there is always some type of energy loss, either in heat produced by a machine or processes for its operation, for this reason the output work is always less than the input work.
Regarding the ratio work output to work input:
because work input WI is always greater than work output WO.