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Is there any input that SHA-1 will compute to a hex value of fourty-zeros, i.e. "0000000000000000000000000000000000000000"?
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SHA1 is a message hashing or digest algorithm where it generates a 160-bit unique value from the input. The size of the input does not matter, because SHA1 always generates a message hash of the same size, which is 160 bits.
The hash size for the SHA1 algorithm is 160 bits.
The length of a SHA1 hash is 160 bits or 20 bytes. In this application it is represented by 40 characters in hexadecimal form.
Yes, it's just incredibly unlikely. I.e. one in 2^160, or 0.00000000000000000000000000000000000000000000006842277657836021%.
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