Which of the following procedures would not be expected to increase the fatigue-crack initiation life of a plain low-carbon steel?
(a) Case hardening
(b) Shot peening
(c) Decreasing the grain size
(d) Annealing
(d) Annealing
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Many of the smallest Jovian moons are most likely
A) captured asteroids and comets B) captured objects from outside the solar system C) small clumps of gas left over from the formation of the host planet D) fragments of other moons
A rock is projected from the edge of the top of a building with an initial velocity of 12.2 m/s at an angle of 53° above the horizontal. The rock strikes the ground a horizontal distance of 25 m from the base of the building. Assume that the ground is level and that the side of the building is vertical. How tall is the building?
a. 25.3 m b. 29.6 m c. 27.4 m d. 23.6 m e. 18.9 m
Which of the following scenarios involves energy that we would typically calculate with Einstein's formula E = mc2?
A) A small amount of the hydrogen in a nuclear bomb becomes energy as fusion converts the hydrogen to helium. B) A burning piece of wood produces light and heat, therefore giving off radiative and thermal energy. C) A mass raised to a great height has a lot of gravitational potential energy. D) An object accelerated to a great speed has a lot of kinetic energy.
Two sources of light illuminate a double slit simultaneously. One has wavelength 570 nm and the second has an unknown wavelength. The m = 5 bright fringe of the unknown wavelength overlaps the m = 4 bright fringe of the light of 570 nm wavelength
What is the unknown wavelength? A) 456 nm B) 326 nm C) 380 nm D) 713 nm