The ____ is 18 years and 11 days long
a. sidereal period
b. synodic period
c. eclipse season
d. Saros cycle
e. eclipse year
d
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Life probably did not originate on the land surface because
A) impacts would have destroyed any life that appeared B) water was not plentiful on land C) there was no ozone layer to shield out harmful UV rays D) organic materials were not present on the land
A charged particle having electric charge Q=4.0 e enters a region of magnetic field 1.2 T at an angle of 
relative to the magnetic field direction. If the speed of the particle upon entering the region is 2.8 x 104 m/s and the magnitude of the force on it is 1.3 x 10-14 N, what is the angle 
?
a. 
b. 
c. 
d. 
A 2.0-cm length of wire centered on the origin carries a 20-A current directed in the positive y direction. Determine the magnetic field at the point x = 5.0 m on the x-axis.
A. 1.6 nT in the negative z direction B. 1.6 nT in the positive z direction C. 2.4 nT in the negative z direction D. 2.4 nT in the negative z direction E. None of the above
Jovian planets are found in the inner solar system
a. True b. False Indicate whether the statement is true or false