At temperatures well below half of the melting temperature, the primary mechanism of creep strain in metals is
(a) Cobel creep.
(b) Dislocation glide.
(c) Dislocation creep.
(d) Herring-Nabarro vacancy flux
(b) Dislocation glide.
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A cart starting from rest rolls down a hill and at the bottom has a speed of 4 m/s. If the cart were given an initial push, so its initial speed at the top of the hill was 3 m/s, what would be its speed at the bottom?
a) 4 m/s b) 5 m/s c) 6 m/s d) 7 m/s e) 25 m/s
A rock is thrown downward from an unknown height above the ground with an initial speed of 10 m/s. It strikes the ground 3.0 s later. Determine the initial height of the rock above the ground
a. 44 m b. 14 m c. 74 m d. 30 m e. 60 m
The wavelengths corresponding to the harmonics of an organ pipe that is open at one end and closed at the other can be found by saying that the length of the pipe must be equal to
A) an odd number of quarter-wavelengths. B) an odd number of third-wavelengths. C) an odd number of half-wavelengths. D) an integer number of half-wavelengths. E) an integer number of wavelengths.
The root mean square speed of a gas molecule is greater than the average speed, because the former gives a greater weight to
A. lighter molecules. B. heavier molecules. C. lower speeds. D. higher speeds. E. more probable speeds.