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When a metal is heated its density decreases. There are two sources that give rise to this diminishment of ρ: (1) the thermal expansion of the solid, and (2) the formation of vacancies. Consider a specimen of gold at room temperature (20?C) that has a density of 19.320 g/cm3.
(a) Determine its density upon heating to 800oC when only thermal expansion is considered.
(b) Repeat the calculation when the introduction of vacancies is taken into account. Assume that the energy of vacancy formation is 0.98 eV/atom, and that the volume coefficient of thermal expansion, αv is equal to 3αl.
Two converging lenses, A with a focal length of +2.0cm and B with a focal length of +5.0cm, are placed 14cm apart. An object is place 3.0cm to the left of lens A. A prism with angles 45°,45°, and 90° is to be utilized to turn a beam of light through ..
He is playing outside and has an east wind affecting the puck which has a magnitude of 12m/s. What will the direction of the puck be in degrees and what will be its velocity?
Find the net downward force on the tank's flat bottom, of area 1.60 m^2, exerted by water and air inside the tank and air outside the tank.
galileo discovered that something remains unchanged for balls rolling down inclined planes. what remains the same as
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Which of the following would be considered a physical property? Which statement best describes a compound?
A 6650kg iceberg with density 931 {\rm kg/m}^3 is afloat in seawater with density 1030 {\rm kg/m}^3. Find the volume of water displaced by the iceberg
A sold cylinder of radius .35 m is released from rest from a height of 1.8 m and rolls down the incline as shown. What is the angular and transitional speed
a physics teacher performing an outdoor demonstration suddenly falls from rest off a high cliff and simultaneously
A 390 nm thick film floats on a puddle of water. When illuminated normally with 700 nm light there is no reflection, but 400 nm light is strongly reflected. What is the film's index of refraction
Find the critical angle for an optical fiber whose core has n value of 1.55 and whose cladding has n value of 1.20
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