The change in rotation rate of a spinning object caused by its size change is a consequence of
A. conservation of magnetic energy.
B. the special theory of relativity.
C. conservation of angular momentum.
D. the law of action-reaction.
E. None of these choices is correct.
Answer: C
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Design a composite material made of epoxy and uniaxial E-glass fibers that has an axial thermal conductivity of 8 Wm-1 K-1 . The thermal conductivity of E-glass is 13 Wm-1 K-1 , and for epoxy it is 0.1 Wm-1 K-1 .
(a) What is the volume fraction of fibers and matrix in this composite? (b) What is the transverse thermal conductivity of this material?
Four students measure the mass of an object, each using a different scale. They record their results as follows:
Student A B C D E Mass (g) 49.06 49 50 49.1 49.061 Which student used the least precise scale? A) A B) B C) C D) D E) E
A 20-m long steel wire (cross-section 1.0 cm2, Young's modulus 2.0 × 10^11 N/m2), is subjected to a load of 25 000 N. How much will the wire stretch under the load?
a. 0.25 cm b. 2.5 cm c. 12.5 cm d. 25 cm e. 1.25 cm
How can a nucleus be described by particular values of A, Z and N when the mass of the nucleus is not equal to Zmp + Nmn, where mp and mn are the masses of free protons and neutrons?
a. A, Z and N have no intrinsic meaning. b. A, Z and N describe the number of particles of given types, but mass has no meaning when part of the mass is elsewhere in the universe. c. A, Z and N describe the number of particles an ideal rather than a real nucleus would have. d. A, Z and N describe the number of particles of given types in the nucleus, but not their masses in a bound state. e. A, Z and N describe the number of particles of given types in the nucleus since the missing mass consists of electrons that are also present in the nucleus.