A series LR circuit includes a 9.0 V battery, a resistance of 0.50 
and an inductance of 0.80 H. What is the current 2.0 s after the switch is closed?
A. 18 A
B. 13 A
C. 6.4 A
D. 5.2 A
E. 4.3 A
B. 13 A
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When there is electric current through an ionic liquid such as salty water, the moving charges are
A) only protons. B) only electrons. C) only negative ions. D) only positive ions. E) both positive and negative ions.
A 5-gallon container of water (approximately 20 kg) having a temperature of 212°F is added to a 50-gallon tub (approximately 200 kg) of water having a temperature of 50°F. What is the final equilibrium temperature (in °C) of the mixture?
a. 54 b. 36 c. 18 d. 66 e. 14
The toughness of a material is:
(a) The strain energy per unit volume needed to fracture the material. (b) The maximum engineering stress. (c) The true stress at fracture. (d) The ductility times the stress at fracture.
The most basic definition of life which takes account of the relative importance of the six fundamental properties of living things is that life is something that can
A) grow and develop B) respond to environmental changes C) utilize energy D) reproduce and evolve through natural selection