ciliary muscle is relaxed
An object in free fall will fall approximately 64 feet in 2 seconds.
When an object is lifted 6 feet off the ground, its potential energy is a certain value based on its height and mass. If the same object is then lifted 12 feet off the ground, its potential energy will be doubled compared to when it was lifted 6 feet. This is because potential energy is directly proportional to the height to which the object is lifted.
Speed = (distance) / (time) = 33/5 = 6.6 feet per second
Ignoring air resistance ... Any object dropped near the Earth's surface reaches a speed of 43.9 feet per second after falling 30 feet. The velocity is 43.9 feet per second down. The object's weight makes no difference.
It would take approximately 50 seconds for an object to fall 60,000 feet in a vacuum without air resistance. However, in reality, factors like air resistance would affect the actual time it takes for the object to fall.
Fog, mist, dark
It means the average person can see clearly at 20 feet what you can see clearly at 15 feet.
3,280.8399 feet = 0.621371193 miles
[object Object]
Having 20/100 vision means that a person can see at 20 feet what someone with normal vision can see at 100 feet. This indicates poor visual acuity and may require correction with glasses, contact lenses, or surgery.
A 304800 meter object is 1000000 feet long!
Feet are the same as linear feet. Linear just distinguishes them clearly from square feet or cubic feet.
23 sec
It means you can see clearly at 20 feet what a normal person could see clearly at 70 feet. You may be needing glasses just for driving.
anaconda
7,500 square feet. To calculate square feet simply multiply length by width - the result is the area in square feet.
In nearsightedness, the eyeball is elongated and the focal point thus falls short of the retina. This results in good vision for objects very close to the face, but poor vision at any significant distance (even beyond a few feet, for any level of nearsightedness. Conversely, in farsightedness, the focal point is never reached, before the retina. Thus, objects which are near cannot be seen clearly. However, distance sight is preserved.