Which planet is very hot because of an extreme greenhouse effect?
a) Mars
b) Earth
c) Venus
d) Mercury
e) Jupiter
Ans: c) Venus
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In vacuum, the components of an EM wave are 
and 
0. In what direction is this wave moving?
A. positive x-direction B. negative x-direction C. positive y-direction D. negative y-direction E. positive or negative z-direction
Why can't the carbon dioxide cycle easily correct for the increasing amounts of carbon dioxide introduced into our atmosphere by industrialization?
A) it operates far too slowly to correct for any short-term changes B) pollution has stopped the carbon dioxide cycle from operating C) the carbon dioxide cycle only influences carbon dioxide produced by natural sources D) it operates far too quickly to correct for any short-term changes
A segment of wire carries a current of 25 A along the x axis from x = ?2.0 m to x = 0 and then along the z axis from z = 0 to z = 3.0 m. In this region of space, the magnetic field is equal to 40 mT in the positive z direction. What is the magnitude of the force on this segment of wire?
a. 1.0 N b. 5.0 N c. 2.0 N d. 3.6 N e. 3.0 N
The ______________ effect provides evidence of motions within other planetary systems
Fill in the blank(s) with correct word