Why do bridges have expansion joints?
a. They would buckle and crack otherwise.
b. to let water run off
c. to absorb vibrations due to traffic
d. for ease in construction
a
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Two small charged objects repel each other with a force F when separated by a distance d. If the charge on each object is reduced to one-fourth of its original value and the distance between them is reduced to d/2 the force becomes:
A) F/16 B) F/8 C) F/4 D) F/2 E) F
The contained air in a closed, sealed can placed on a hot stove will undergo an increase in
A) internal energy. B) temperature. C) pressure. D) all of the above E) none of the above
When an object of mass m is pushed to relativistic speed v, its momentum is
A) greater than mv. B) smaller than mv. C) equal to mv.
What feature of the photosphere is evidence for convection in the sun?