Two objects are dropped from a bridge, an interval of 1.0 s apart. Neglect air. During the time that both objects continue to fall, their separation
A) increases.
B) decreases.
C) stays constant.
D) increases at first, but then stays constant.
E) decreases at first, but then stays constant.
A
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Three long wires parallel to the x axis carry currents as shown. If I = 20 A, what is the magnitude of the magnetic field at the origin?
a.
37 ?T
b.
28 ?T
c.
19 ?T
d.
47 ?T
e.
58 ?T
Neutron stars and black holes are formed by:
A) the star formation process. B) mass transfer in binary star systems. C) novae. D) type I supernovae. E) type II supernovae.
For an ohmic conductor, current is
a. directly proportional to voltage. b. directly proportional to resistance. c. independent of resistance. d. independent of voltage.
What is one thing that all monomers of addition polymers have in common?
A) The monomer has to have at least one double bond. B) The monomer has to have at least two functional groups (though they can be the same). C) The monomer has to have at least two functional groups (though they must be the different). D) The monomer has to be very small. E) The monomer has to have a number of polymer components.