A cube of copper 0.10 meters on each side has an average grain size of 10 × 10-6 m. The average grain boundary energy of copper is 625 × 10-3 J/m2 . Assume that all of the grains are cubes 10 × 10-6 m across.
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An object initially at rest suddenly explodes in two fragments of masses and that move in opposite directions. If the speed of the first fragment is find the internal energy of the explosion
A) 38 J B) 30 kJ C) 30 J D) 38 kJ
An electron is confined in a harmonic oscillator potential well. A photon is emitted when the electron undergoes a 3?1 quantum jump
What is the wavelength of the emission if the net force on the electron behaves as though it has a spring constant of 9.6 N/m? (mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 290 nm B) 150 nm C) 190 nm D) 580 nm
Transmitting power at high voltage, e.g., 400,000 V, reduces the power loss for transmission lines. But such a voltage would destroy electrical devices in household use. How then can such 400,000 V electricity be used in a normal house?
a. The ground prongs on household plugs reduce the voltage to 120 V. b. Before reaching households, transformers are used to reduce the voltage appropriately. c. No matter the incoming voltage, a 120 V device only lets 120 V in. d. The 400,000 V is just theoretical; long distance transmission lines actually use 120 V.
If the Andromeda Galaxy collided with the Milky Way, what would most likely happen to Earth?
A) nothing B) The Sun and all its planets would be crushed by collisions with stars and planets from the Andromeda Galaxy. C) The Sun would not be disturbed, but the solar system would be ripped apart. D) The Sun would die, causing Earth to die as well.