you have to look around the area were the object mite have been at
1. there mush be a source of light 2.the light must strike an object 3.the light must be reflected from the object to your eye
Gravity I guess :-)
The force of gravity must be greater than the mass of the object
He (or she) must float motionless and unattached to any object or cable.
-- You "see" only when light enters your eye. -- You 'see' an object only when light from that object enters your eye. -- If the object itself doesn't generate light, then light from some other source must illuminate the object, and some of that light must reflect from the object to your eye. -- In absolute darkness, there is no light, and you do not 'see'.
When light reflects, on an object it bounces off of the object and you can see the object much more clearly.
first the pupil must expand to let the light in and the image falls on the retina. comes and rod cells absorb the light and transmit a signal to the brain and the brain flips the image right side up again that's what must happen for the eye to see.
they must become unbalancedBy Eiman Ranafrom Faisalabad,Pakistan
For acceleration to occur, there must be a change in an object's velocity over time. This change can happen by increasing or decreasing the object's speed or by changing its direction of motion. In essence, acceleration is a measure of how much an object's velocity changes per unit of time.
The force of gravity must be greater than the mass of the object
For an object to be seen, it must reflect light into your eyes. This reflection allows your brain to interpret the information and form an image of the object in your mind. The object must also be within your field of vision and not obstructed by other objects.
A stationary frame of reference.