What surprised scientists to learn about Mercury from MESSENGER's data?
a. Mercury is still geologically active with molten lava flows on the surface.
b. Mercury does have an atmosphere causing some erosion of the surface.
c. Mercury has significantly more craters than the Moon
d. Mercury has a magnetic field despite its size.
e. Mercury is rotating faster than earlier predicted.
d
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The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
A. E. B. F. C. G. D. H. E. A.
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
What is the ratio of the pressure that a constant-volume gas thermometer registers at the boiling point of water to the pressure it registers at the freezing point?
A) 1.00 B) 1.24 C) 1.32 D) 1.37 E) 1.80
Which of the following objects is experiencing Earth's gravitational force?
A. a skydiver falling under the force of gravity B. an airplane taking-off C. a boat floating in water D. All of these choices are correct. E. Only an airplane taking-off and a skydiver falling under the force of gravity above.