Kirchhoff's Rules: Determine the current in the 7.0-? resistor for the circuit shown in the figure. Assume that the batteries are ideal and that all numbers are accurate to two significant figures.
A. 0.28 A
B. 1.3 A
C. 1.6 A
D. 2.1 A
Answer: C
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A 100 lb sack of potatoes falls from an airplane. As the velocity of fall increases, the air resistance also increases. When air resistance equals 100 lb, the acceleration of the sack will be ____ m/sec/sec
a. 0 b. 16 c. 32 d. 9.8 e. 24
Given that organic molecules need to react in order to produce life, this suggests we should search for worlds in the solar system that have
A) either an atmosphere, or a surface or subsurface liquid medium such as water, or both. B) organic molecules on their surfaces C) an atmosphere D) rocky surfaces
An aquarium contains a 5-cm layer of water (n = 1.333) floating on top of carbon tetrachloride (n = 1.461). If the angle of incidence into the water from the carbon tetrachloride is 20°, what is the angle of refraction into the air?
a. 20° b. 30° c. 38° d. 69° e. 26°
Two large parallel conducting plates are 8.0 cm apart and carry equal but opposite charges on their facing surfaces. The magnitude of the surface charge density on either of the facing surfaces is 2.0 nC/m2 . Determine the magnitude of the electric potential difference between the plates
a. 36 V b. 27 V c. 18 V d. 45 V e. 16 V