The most distant known objects in space are called ______________
Fill in the blank(s) with correct word
quasars
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Two charged particles, Q1 and Q2, are a distance r apart with Q2= 5Q1. Compare the forces they exert on one another when 
is the force Q2 exerts on Q1 and 
is the force Q1 exerts on Q2.
A.
.B.
.C.
.D.
.E.
.A rope is lying on a table. You pick up one end and start raising it with a constant velocity. The force you have to exert on the rope is
A) equal to the weight of the portion of the rope that is not on the table. B) greater than the weight of the portion of the rope that is not on the table. C) less than the weight of the portion of the rope that is not on the table but not zero N. D) zero N. E) Cannot be determined without additional information.
Any change of the energy of a system occurs because of
a. energy transfer across the boundaries of the system. b. combustion of fuels within the system. c. radioactive decay of elements within the system. d. all of the above. e. only (b) and (c) above.
Imagine that you could put three electrons into isolation in a box. Initially, electrons A and B have kinetic energy E0 and electron C has kinetic energy 2E0. After isolation from observation for a short time, you examine the electrons again and find that one electron has energy 2E0 and two electrons have energy E0
Assume for this problem's sake that the electrons can transfer energy to one another but only in increments of E0. Assume also that all electrons are exactly the same. What is the probability that the higher energy electron is electron C?