You are relaxing at home, working on your coin collection. You have learned that collectible coins are sometimes plated with gold to enhance their beauty and value. On an online site that sells collectible coins, you see a commemorative quarter-dollar advertised for sale at $4.98. The information on the site says that the coin has a diameter of 24.6 mm and a thickness of 2.07 mm, and it is completely covered with a layer of pure gold 0.160 µm thick. You know that gold is a valuable asset and you come up with a scheme by which you would separate the gold from the base coin and sell the gold at the current market price. You begin your scheme by buying the advertised coin at $4.98. (Assume the density of gold is 19.3 g/cm3.)
(a) What is the value of the gold for a single such coin (in cents)? Assume that the price of gold is $32.00 per gram.
(b) What would be the cost (in dollars) of the gold to produce the coin if the coin were made entirely of gold?
You are relaxing at home, working on your coin collection. You have learned that collectible coins...
You are relaxing at home, working on your coin collection. You have learned that collectible coins are sometimes plated with gold to enhance their beauty and value. On an online site that sells collectible coins, you see a commemorative quarter-dollar advertised for sale at $4.98. The information on the site says that the coin has a diameter of 24.6 mm and a thickness of 2.08 mm, and it is completely covered with a layer of pure gold 0.165 µm thick....
Collectible coins are sometimes plated with gold to enhance their beauty and value. Consider a commemorative quarter-dollar advertised for sale at $4.98. It has a diameter of 24.3 mm, a thickness of 1.78 mm, and is completely covered with a layer of pure gold 0.154 µm thick. The volume of the plating is equal to the thickness of the layer multiplied by the area to which it is applied. The patterns on the faces of the coin and the grooves...
2. Collectible coins are sometimes plated with gold to enhance their beauty and value. Consider a commemorative quarter-dollar advertised for sale at $4.98. It has a diameter of 24.3 mm, and is completely covered with a layer of pure gold 0.218 um thick. The price of gold is $28.90 per gram; the density is 19.3 g/cm3. The patterns on the faces of the coin and the edge of the coin have a negligible effect on its area. The volume of...
> Hi, I love the work you are doing. It has been very helpful, it has aided my understanding of of some tricky questions in physics. I would like to suggest that you kindly include the missing face in the evaluation of the total surface area. It seems you skipped a constant 2 in front of Pi r^2. I am certain you meant; TSA = 2*Pi*r^2 + 2*Pi*r*h. Apart from that your work flow is flawless. Kind regards
Zee Lee Mon, Mar 21, 2022 4:59 AM