If you draw a spacetime diagram, the worldline of an object that is stationary in your reference frame is
A) vertical.
B) horizontal.
C) slanted.
D) curved.
E) a circle.
A
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You want to produce a casting of sterling silver that is silver plus 13 atomic % copper. Pure silver is too soft for many applications, and adding 13 atomic % copper strengthens the silver without significantly changing the color. To produce the sterling silver casting, you are going to melt commercially pure silver and copper in a furnace, and then you will pour the liquid metal mixture into a mold. The following questions relate to this alloy.
(a) In selecting a furnace, what must be the minimum value of the high-temperature capability of your selected furnace?
(b) In transferring the liquid metal from the furnace to the mold, what is the minimum temperature that the metal can reach so that none of the metal has solidified?
(c) After the casting has cooled to room temperature, what phases are present, what is the equilibrium chemical composition (Ci) of each phase present, and what is the atom fraction (fi) of each phase present?
The nucleus of a hydrogen atom, a proton, sets up an electric field. The distance between the proton and electron is about 5.1 × 10^-11 m. What is the magnitude of the electric field at this distance from the proton? [The charge on the proton is +1.6 × 10^-19 C.]
Ocean waves with a wavelength of 120 m are coming in at a rate of 8 per minute. What is their speed?
a. 8.0 m/s b. 16 m/s c. 24 m/s d. 30 m/s e. 4.0 m/s
Rocks break down to form sediment via
A) erosion. B) transportation. C) sedimentation. D) weathering.