As of 22 February 2014, it's worth $21.84.
That's not an actual dollar coin, but rather a silver bullion round. The coin might not have a date, but it should at least mention its weight. As of 19 February 2014, silver is worth $21.84 per troy ounce.
What is a silver dollar from 1702 worth today
A dollar.
Modern Silver Eagles (1986 to date) contain One Ounce of pure silver.
It depends on what you're calling a "Liberty dollar". All US silver dollars minted up till 1935 had a picture of Miss Liberty on the front. These are worth at least 75% of the current price of an ounce of silver, around $20 as of early 2011, and many of them are worth a lot more. The "dollar" bullion coins minted since 1986 aren't for spending and aren't really silver dollars but are worth a bit more than the price of an ounce of silver. Circulating $1 coins minted since 1971 don't have any silver and are only worth $1. If you have a specific coin you want to evaluate, please post a new question in the form "What is the value of a (date) US silver dollar?", where (date) is of course your coin's date.
What date? Post new question.
What you have is a silver buillion round. As of 28 December 2013, a one ounce round is worth $20.06.
Please post a new question that's less ambiguous. If you mean "what's the value of a silver dollar", include its date and mint mark. If you mean "what's the value of a silver certificate", include its date, the letter (if any) next to the date, and denomination. If you mean "how much is a dollar's worth of silver", Google the words SPOT PRICE SILVER and divide 1 by the price in dollars per ounce to get the number of ounces in $1.
The price of silver at the end of 30 November 2004 was $7.75 per ounce.
Check that date or denomination again. There were no silver dollars minted that year.
1922 is a very common date for silver dollars. At present, they're worth around $23 each.
It is a common date worth about $10 in silver scrap since it is 90% silver.