Tell whether logically or causally possible and example why a)Superman is not causally possible.
b)A squared circle is logically impossible, though it is causally possible.
c)Aliens are not logically possible.
d)A line without points is logically possible.

Notes On This:
1. if p is conceivable it means it is coherently imaginable (imagination is a mental faculty, a thought process linked to rationality).

2. the first step in the evidence that p is possible is to conceive it. we say p is coherently imaginable when its details can be filled and its implication drawn without it being contradictory, i. e., ~(p & ~p).

clearly, not everything that is conceivable is possible, ex. superman, dragons, gremlins, succubbi, are all conceivable, but not possible.

if p is conceivable then, from 2. it's logically possible. finally,

3. p is causally possible if it doesn't violate a law of nature.

how do logical possibility (LP) and causal possibility (CP) relate?

LI → CI
CP → LP

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft