Long shadows are cast at sunset when the sun is at its lowest.
The times of sunset (and sunrise) are readily available and may often be found in diaries.
56.25 feet
late afternoon (sunset)
There are two factors involved in casting a shadow: the height of the object and the direction (angle) of the light source. Generally, problems like this include the time of day or the angle of the sun or a comparison to some other object. As written, it is not possible to answer this question unequivocally.
84 feet tall
That all depends upon what time of day the shadow was cast. For example, at straight up noon, even a very tall building wouldn't cast much of a shadow, but at sunrise or sunset, even a tiny building might cast an 18 foot long shadow, or even longer.
Designate the unknown shadow length by s. Shadows cast at the same time and place are proportional to the height of the object casing the shadow. Therefore: 4/6 = s/21, or s = [4(21)]/6 = 14 feet.
For a given shadow object, and at a given time of the day, the shadows will be longer in winter, for then the Sun will be lowest in the sky
56.25 feet
late afternoon (sunset)
There are two factors involved in casting a shadow: the height of the object and the direction (angle) of the light source. Generally, problems like this include the time of day or the angle of the sun or a comparison to some other object. As written, it is not possible to answer this question unequivocally.
84 feet tall
4 feet24/16 = 6/x24x = 96x = 4
That all depends upon what time of day the shadow was cast. For example, at straight up noon, even a very tall building wouldn't cast much of a shadow, but at sunrise or sunset, even a tiny building might cast an 18 foot long shadow, or even longer.
It has something to do with what light happens to be around that person at the time. If there happens to be a bright light shining on an object, that object's 'shadow' will cast itself on whatever is around it. +++ More simply, the "something" is the object blocking the direct light from the source. The air scatters the light so the shadow is not very dark - on the air-less Moon a shadow is fully dark.
17.45 feet.
its not
The shadow of an object on a flat horizontal surface starts out long , pointing west. As the day progresses the shadow shortens and in the Northern hemisphere moves north of the object becoming shortest and pointing due north when it is noon local solar time. The shadow lengthens and points more westerly later on in the afternoon.