Determining the composition of an astronomical body using its emitted or reflected light is called ________.
A. radiation
B. astronomy
C. spectroscopy
D. refraction
E. quantization
Answer: C
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A 30.0-kg child sits on one end of a long uniform beam having a mass of 20.0 kg, and a 40.0-kg child sits on the other end. The beam balances when a fulcrum is placed below the beam a distance 1.10 m from the 30.0-kg child. How long is the beam?
A) 2.12 m B) 1.98 m C) 1.93 m D) 2.07 m E) 2.20 m
A cubic centimeter of pure water at maximum density has a mass of
a. 1 g. b. 1 kg. c. 1 cg. d. 1 lb. e. none of these
For a particular spring, the spring constant
A. Increases as the spring is stretched B. Increases as the spring is compressed C. Decreases as the spring is compressed D. Is the same regardless of stretching or compressing
If sufficient force is applied to a crystal, it can be permanently deformed. Permanent deformation in metal crystals occurs due to atomic displacements on the planes that are most closely packed, and it happens in the most closely packed directions. Assume that a force is applied to a crystal of FCC copper that permanently stretches the crystal in the [001] direction. The (111) plane is one of the close-packed planes in FCC copper on which permanent deformation could occur.
(a) What is the angle between the [001] direction and the normal to the (111) plane? (b) Atom displacements along which close-packed directions within the (111) plane could contribute to the permanent deformation of the crystal in the [001] direction?