When a collision is perfectly inelastic, then:
a. all the kinetic energy is conserved.
b. all the kinetic energy is gone.
c. the participants stick together.
d. the total momentum is zero.
c
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Two charges are located on the x-axis. A 22 ?C charge is located at the origin and a 47 ?C charge is located at x = 4.0 m. What is the magnitude of the electric field at x = 7.5 m?
a. 
b. 
c. 
d. 
e. 
A straight wire (length = 8.0 m) is bent to form a square. If the wire carries a current of 20 A, what is the magnitude of the magnetic field at the center of the square?
A. 17 ?T B. 14 ?T C. 11 ?T D. 20 ?T E. 36 ?T
Radioactivity Basics: A nucleus 
X undergoes one alpha decay followed by 3 beta-minus decays.(a) What is the resulting nucleus in terms of M and N?(b) If there had been 3 beta-plus decays instead of the beta-minus decays, what would have been the resulting nucleus in terms of M and N?
What will be an ideal response?
What is the Great Wall?
A) It is a ridge on the Moon near the crater Birt. B) It is the distance beyond which astronomers cannot view any more galaxies or even quasars. C) It is a large sheet of galaxies. D) It is the time before the universe started expanding, about which we can never know anything. E) It is an enormous intergalactic cloud of dust and gas that hides more distant galaxies.