If three identical bulbs are connected in series across a 12-V battery, the voltage across each bulb will be
a. 12 V.
b. 4 V.
c. different.
d. none of the above.
b
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Given that the charge on an up quark is +2/3 and the charge on a down quark is ?1/3, which combination represents a proton?
A. uud B. udd C. uuu D. ddd
An electron traveling toward the magnetic north with speed 400 km/s enters a region where the earth's magnetic field has the magnitude 5.0 × 10-5 T and is directed downward at 45° below horizontal
What magnitude magnetic force acts on the electron? (e = 1.60 × 10-19 C)
The discovery of a supernova by Tycho Brahe in 1572 contradicted the commonly held belief that the universe was
A) unchanging B) spherical C) infinite D) perfect
The three principal sources of internal heat of terrestrial planets are
A) conduction, differentiation, and accretion. B) accretion, differentiation, and radioactivity. C) accretion, differentiation, and eruption. D) convection, differentiation, and eruption. E) conduction, convection, and eruption.