How is the sunspot cycle directly relevant to us here on Earth?
A) The sunspot cycle strongly influences Earth's weather.
B) The Sun's magnetic field, which plays a major role in the sunspot cycle, affects compass needles that we use on Earth.
C) The brightening and darkening of the Sun that occurs during the sunspot cycle affects plant photosynthesis here on Earth.
D) Coronal mass ejections and other activity associated with the sunspot cycle can disrupt radio communications and knock out sensitive electronic equipment.
E) The sunspot cycle is the cause of global warming.
D
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A 2.0-C charge moves with a velocity of (
m/s and experiences a magnetic force of 
N. The x component of the magnetic field is equal to zero. Determine the z component of the magnetic field.
A. ?3.0 T B. +3.0 T C. +5.0 T D. ?5.0 T E. +6.0 T
____ is a mineral made of oxidized hydrogen
Fill in the blank(s) with the appropriate word(s).
According to Copernicus, retrograde motion for Venus must occur around
A) greatest elongation, when the planet is farthest from the Sun. B) inferior conjunction, when it passes between us and the Sun. C) superior conjunction, when the planet is on the far side of the Sun. D) quadrature, when the planet is 90 degrees away from the Sun. E) opposition, when the planet lies opposite the Sun in the sky.
What is the unit of electric current?
a. The volt. b. The joule. c. The coulomb. d. The ampere. e. The watt.