In science, a broad idea that has been repeatedly verified so as to give scientists great confidence that it represents reality is called
A) a paradigm.
B) a hypothesis.
C) Ptolemaic model.
D) a theory.
D
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A string with a mass per length of 2.00 g/m is stretched between two points that are 0.400 m apart. The third mode frequency of the stretched string is 20.0 Hz lower than the fourth mode frequency. What is the tension in the string?
A. 180 N B. 160 N C. 140 N D. 120 N E. 100 N
If life exits on Mars today, it is most likely to be found
A) beneath the surface B) on the surface C) floating in the atmosphere D) buried in the polar ice caps
A silver bar of length 30 cm and cross-sectional area 2.0 cm2 is used to transfer heat from a 100°C reservoir to a 0°C block of ice. How much ice is melted per second? (For silver, k = 427 W / m • °C. For ice, Lf = 334,000 J/kg.)
a. 4.2 g/s c. 0.80 g/s b. 0.085 g/s d. 0.043 g/s
Answer the following statement(s) true (T) or false (F)
1. 
U (uranium) can decay to 
Pb (lead) through an appropriate sequence of alpha and beta decay processes.