When a current flows down a wire
A. electrons are moving in the direction of the current.
B. electrons are moving opposite the direction of the current.
C. protons are moving in the direction of the current.
D. protons are moving opposite the direction of the current.
E. both protons and electrons are moving in the direction of the current.
B. electrons are moving opposite the direction of the current.
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A 10-? resistor and a 20-? resistor are connected in parallel, and this combination is connected in series to a 30-? resistor. If the arrangement is hooked to a 12-V battery, how much current flows in the circuit?
An automobile moving along a straight track changes its velocity from 40 m/s to 80 m/s in a distance of 200 m. What is the (constant) acceleration of the vehicle during this time?
a. 8.0 m/s b. 9.6 m/s c. 12 m/s d. 6.9 m/s e. 0.20 m/s
What are the two fundamental laws that lie at the heart of quantum mechanics?
A) (1) the uncertainty principle and (2) the exclusion principle B) (1) the absoluteness of the speed of light and (2) the equivalence principle C) (1) the law of conservation of energy and (2) the electromagnetic force law D) (1) the law of conservation of angular momentum and (2) the law of conservation of energy
The process by which molecules escape from a liquid into the gas phase is called
A) evaporation B) gasification C) sublimation D) condensation