Briefly describe the three factors that would determine planetary temperatures in the absence of greenhouse gases
What will be an ideal response?
In the absence of greenhouse gases, the factors determining the planet's temperature are its distance from the Sun, which determines how much sunlight it receives per square meter; its albedo, how much sunlight that is reflected instead of absorbed by the surface; and how fast it rotates, which determines how the temperature differs between day and night.
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Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If two collinear vectors 
and 
are added, the resultant has a magnitude equal to 4.0. If is subtracted from , the resultant has a magnitude equal to 8.0. What is the magnitude of ?
A. 2.0
B. 3.0
C. 4.0
D. 5.0
E. 6.0
A region of space contains a uniform electric field oriented along the y-axis. A frame of surface area A is placed perpendicular to the y-axis in the xz-plane. The magnitude of the electric flux through this frame is ?0
A second frame is placed in the same electric field in such a way that the magnitude of the electric flux through it is ?0/2. How is the plane of second frame oriented with respect to the plane of the first one? A) at a 90° angle B) at a 60° angle C) parallel to the first frame D) perpendicular to the first frame E) at a 30° angle
If you push with 200 N of force against your 1500-N refrigerator and it slides across your kitchen floor at constant velocity, friction of the floor against the refrigerator must be
1) zero, 2) 200 N, 3) 1300 N, 4) 1500 N, 5) greater than 1500 N, and the force with which you push must be 6) equal and oppositely directed to the friction force. 7) the action force, and the friction the reaction force. 8) both of these. 9) none of these.
Jocko the clown at the top of a tall flagpole has considerable potential energy relative to the circus net below. After stepping off the pole and neglecting air resistance, his potential energy when he is half way to the net is
1) the same as at the top, 2) one quarter the amount at the top, 3) one half the amount at the top, 4) more than one-half the amount at the top, and compared to his kinetic energy when meeting the net, his kinetic energy at the half-way point is 5) one half. 6) the same as his potential energy at the half-way point. 7) both of these 8) neither of these