The Summer Triangle is formed by the stars Deneb, Vega, and Altair
Indicate whether the statement is true or false
TRUE
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If a two–body collision is not head–on, then we may always assume that:
a. momentum is conserved. b. kinetic energy is conserved. c. neither momentum nor kinetic energy are conserved. d. both momentum and kinetic energy are conserved.
Relative Velocity: An airplane with an airspeed of 120 km/h has a heading of 30° east of north in a wind that is blowing toward the west at 30 km/h. What is the speed of the plane relative to the ground?
A. 90 km/h B. 110 km/h C. 140 km/h D. 150 km/h
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 up out of 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.
Suppose that an atom has two energy levels separated by an energy difference ?E. When such atoms are in thermal contact with a reservoir at temperature T, there is roughly 1 atom in the higher state for every 4 in the lower state. What is the approximate ratio of ?E to kBT?
A. 
B. 4
C. ln 4
D. ?ln 4
E. e?1/4
F. e?4
T. Other (specify)