Chapter 4: Q21P (page 166)
If in a certain material whose atoms are in a cubic array the interatomic distance is and the mass of one atom is , what be the density of this material?
Short Answer
The density of the material is .
Chapter 4: Q21P (page 166)
If in a certain material whose atoms are in a cubic array the interatomic distance is and the mass of one atom is , what be the density of this material?
The density of the material is .
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Get started for freeA certain metal with atomic mass 2 × 10-25 kg has an interatomic bond with length 2.1 × 10-10 m and stiffness 40 N/m. What is the speed of sound in a rod made of this metal?
Two wires are made of the same kind of metal. Wire A has a diameter of 2.4 mm and is initially 2.8m long. You have a 8kg mass from wire A, measure the amount of stretch, and determine Young’s modulus to be Wire B, which is made of the same kind of metal as wire A, has the same length as wire A but twice the diameter. You hang the same 8kg mass from wire B, measure the amount of stretch, and determine Young’s modulus ,
Which one of the following is true?
An object of mass is attached by two stretched springs (stiffness and relaxed length ) to rigid walls, as shown in figure 4.60. The springs are initially stretched by an amount . When the object is displaced to the right and released, it oscillates horizontally. Starting from the momentum principle, find a function of the displacement of the object and the time describes the oscillatory motion.
(a) What is the period of the motion?
(b) If were shorter (so the springs are initially stretched more), would the period be larger, smaller, or the same?
Question:A certain metal with atomic mass 2 × 10−25 kg has an interatomic bond with length 2.1 × 10−10 m and stiffness 40 N/m. What is the speed of sound in a rod made of this metal?
Two blocks of mass m1 and m3 , connected by a rod of mass m2 , are sitting on a low friction surface, and you push to the left on the right block (mass m1 ) with a constant force of magnitude F(Figure 4.57).
(a) What is the acceleration of the blocks?
(b) What is the vector force exerted by the rod on the block of mass m3 ? ( is approximately equal to the compression force in the rod near its left end.)What is the vector forceexerted by the rod on the block of massm1? is approximately equal to the compression force in the rod near its right end.)
(c) Suppose that instead of pushing on the right block (mass m1 ), you pull to the left on the left block (mass m3) with a constant force of magnitude F . Draw a diagram illustrating this situation. Now what is the vector force exerted by the rod on the block of mass m3?
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