Answer:
A pulley is a circular disc having groove along it's circumference.
wheel and axle is an arrangement of two co-axial cylinders with different radii in which one rotates to give the rotation to another
It is only vehicles? Or can it be other things too. But trains also require a ticket.
Power is the possession of Authority
The correct answer is primary appraisal.
According to Lazarus's theory of stress, primary appraisal refers to the process wherein individuals form a judgement or an evaluation of a stressor (an external factor or stimulus that can potentially cause stress) when they are first faced with it. Individuals might either evaluate and judge the stressor as being either a challenge or threat. For instance, if you notice that someone has been following you for a few blocks, through the process of primary appraisal you will determine whether or not its a threat.
Answer:
D, the planets
Gravitational cycle of the planets are usees as a barrier for the sun.
