If a binary system has a period of 4 years and a separation of 5 AU, then the total mass is 7.8 solar masses
a. True
b. False
Indicate whether the statement is true or false
True
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The position of a mass that is oscillating on a spring is given by x = (17.4 cm) cos[(5.46 s-1)t]. What is the angular frequency for this motion?
A) 0.183 rad/s B) 5.46 rad/s C) 2.34 rad/s D) 17.4 rad/s E) 0.869 rad/s
Instructions: On occasion, the notation 
= [A, ?] will be a shorthand notation for 
.
The vector 
has components +5 and +7 along the x and y axes respectively. If the vector is now rotated 90 degrees counterclockwise relative to the original axes, the vector's components are now
A. ?7; ?5.
B. 7; ?5.
C. ?7; 5.
D. 7; 5.
E. 7; 0.
A 3.0 cm section of a horizontal wire carrying a 6.7 A current from east to west is placed in a north to south 0.42 T magnetic field in the lab. What is the magnitude of the force on the 3.0 cm section of the wire?
A. 0.084 N B. 0.17 N C. 0.25 N D. 0.0017 N E. 0.0025 N
Evidence for the loss of water from the atmosphere of Venus via the action of ultraviolet light comes from the
A) observation of auroras high in the Venusian atmosphere caused by the action of ultraviolet light on water molecules B) fact that today, water is found only in the upper atmosphere of Venus C) observation of an ozone layer in the atmosphere which is formed from the breakup of water molecules by ultraviolet radiation D) observation of an excess of heavy hydrogen (deuterium) atoms in the atmosphere which are less easily able to escape once the water is broken apart