Which of the following did Alfred Wegener not use to support his theory of continental drift?
A) paleoclimate data
B) similar fossils on widely separated continents
C) paleomagnetic data
D) similar rocks on widely separated continents
Answer: C
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An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, what is the direction of the magnetic field in this region?
A) along the +z-axis B) along the -z-axis C) along the -x-axis D) along the +y-axis E) along the -y-axis
Consider point charges of +Q and +4Q, which are separated by 3 m. At what point, on a line between the two charges, would it be possible to place a charge of -Q such that the electrostatic force acting on it would be zero?
A) 3/5 m from the +Q charge B) 1 m from the +Q charge C) 1 m from the +4 charge D) 3 m from the +4 charge E) There is no such point possible.
Light at the peak frequency of an incandescent lamp depends on the
A) amount of electrical energy transformed. B) rate of atomic and molecular vibrations. C) voltage applied to the lamp. D) electrical resistance of the lamp. E) transparency of glass.
A Venturi tube may be used as the inlet to an automobile carburetor. If the 2.0-cm diameter pipe narrows to a 1.0-cm diameter, what is the pressure drop in the constricted section for an airflow of 3.0 m/s in the 2.0-cm section? (? = 1.2 kg/m3.)
a. 70 Pa b. 85 Pa c. 100 Pa d. 120 Pa e. 81 Pa