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Chapter 4: 2CP (page 136)
Approximately what is the radius of a copper atom? Is it , , , , or ?
The approximate radius of a copper atom is.
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A certain metal with atomic mass 2 脳 10-25 kg has an interatomic bond with length 2.1 脳 10-10 m and stiffness 40 N/m. What is the speed of sound in a rod made of this metal?
One mole of Nickel has a mass of , and its density is . You have a bar of nickel 2.5 m long, with a cross-section of 2mm on a side. You hang the rod vertically and attach a 40 kg mass to the bottom, and you observe that the bar becomes 1.2 mm longer. Next, you remove the 40 kg mass, place the rod horizontally, and strike one end with a hammer. How much time will elapse before a microphone at the other end of the bar will detect a disturbance?
The period of a particular spring-mass oscillator is when the amplitude is . (a) what would be the period if we doubled the mass? (b) What would be the period if we replaced the original spring with a spring that is twice as stiff (keeping the original mass)? (c) What would be the period if we cut the original spring in half and use just one of the pieces (keeping the original mass)? (d) What would be the period if we increased the amplitude of the original system to , so that the total distance traveled in one period is twice as large? (e) What would be the period if we took the original system to a massive planet where ?
A hanging copper wire with diameter 1.4 mm is initially 0.95m long. When a 36kg mass is hung from it, the wire stretches an amount 1.83mm, and when a 72kg mass is hung from it, the wire stretches an amount 3.66mm. A mole of copper has a mass of 63g, and its density is Find the approximate value of the effective spring stiffness of the interatomic force.
It is hard to imagine that there can be enough air between a book and a table so that there is a net upward (buoyant) force on the book despite the large downward on the top of the book. About how many air molecules are there between a textbook and a table if there is an average distance of 0.1 mm between the uneven surfaces of the book and table?
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