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 2.10 mm, and it is completely covered with a layer of pure gold 0.175 μm thick. you know that gold 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 advertsed coin at $4.98 (assume the density of gold is 19.3 g/cm3) is a valuable asset and you come up with a (a) what is the value of the gold for a single such coin (in cents)? assume that the price of gold is $38.00 per gram (b) what i1? what would be the cost (in dollars) of the gold to produce the coin if the coin were made entirely of gold?

The particle in a two-dimensional well is a useful model for the motion of electrons around the indole ring (3), the conjugated cycle found in the side chain of tryptophan. we may regard indole as a rectangle with sides of length 280 pm and 450 pm, with 10 electrons in the conjugated p system. as in case study 9.1, we assume that in the ground state of the molecule each quantized level is occupied by two electrons. (a) calculate the energy of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels. 9.27 electrons around the porphine ring (4), the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. we may treat the group as a circular ring of radius 440 pm, with 20 electrons in the conjugated system moving along the perimeter of the ring. as in exercise 9.26, assume that in the ground state of the molecule quantized each level is occupied by two electrons. (a) calculate the energy and angular momentum of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels.

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question

A3030 cmcm wrench is used to loosen a bolt with a force applied 0.30.3 mm from the bolt. it takes 6060 nn to loosen the bolt when the force is applied perpendicular to the wrench. how much force would it take if the force was applied at a 3030 degree angle from perpendicular? a 3030 cmcm wrench is used to loosen a bolt with a force applied 0.30.3 mm from the bolt. it takes 6060 nn to loosen the bolt when the force is applied perpendicular to the wrench. how much force would it take if the force was applied at a 3030 degree angle from perpendicular?