Two masses are suspended by cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, 
has a mass of 5.0 kg and the other mass,
has a mass of 3.0 kg. The acceleration of 
is
A. 3.3 
upward.
B. 3.3 upward.
C. 2.5 upward.
D. 2.5 upward.
E. 1.1 upward.
D. 2.5 upward.
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An atom that has equal amounts of protons and electrons is a ______________ ion
a. neutral b. positive c. negative d. polyatomic
Energy from the core of the Sun first travels slowly through the convection zone and then much faster through the radiation zone
Indicate whether the statement is true or false
A long wire is known to have a radius greater than 4.0 mm and to carry a current uniformly distributed over its cross section. If the magnitude of the magnetic field is 0.285 mT at a point 4.0 mm from the axis of the wire and 0.200 mT at a point 10 mm from the axis, what is the radius of the wire?
a. 4.6 mm b. 7.1 mm c. 5.3 mm d. 12 mm e. 10 mm
For the same temperature increase in a system, the change in entropy, ?S, is largest in a reversible
A. constant-volume process. B. constant-pressure process. C. adiabatic process. D. process in which no heat is transferred. E. process in which no work is performed.