During a very cold winter, water pipes sometimes burst due to
A) the ground contracting when colder.
B) water expanding when freezing.
C) water contracting when freezing.
D) thawing producing pressure on the pipes.
E) none of the above
Answer: B
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Answer the following statement true (T) or false (F)
Is the actual size of the universe larger than 14 billion light years?
A) The observable universe is 14 billion light years in each direction, so the actual universe is greater than 14 billion light years across. B) We do not have enough information to know this. C) The universe must be exactly equal in size to its age, so it must not be larger than 14 billion light years across in size. D) It is only 14 billion light years across to us; to an observer 10 billion light years away, it is smaller.
Electrons are "spin one-half," photons are
a. also spin one-half. b. spin zero. c. spin one. d. none of the above.
A rod (length = 2.0 m) is uniformly charged and has a total charge of 40 nC. What is the magnitude of the electric field at a point which lies along the axis of the rod and is 3.0 m from the center of the rod?
a. 40 N/C b. 45 N/C c. 24 N/C d. 90 N/C e. 36 N/C