Why is the Moon's cycle of phases (the synodic month) longer than the Moon's orbital period (the sidereal month)?
A) The Moon completes the cycle of lunar phases before it completes a full orbit around Earth.
B) The Moon has to complete more than one full orbit around Earth to complete the cycle of lunar phases.
C) The Moon orbits Earth faster than Earth orbits the Sun.
D) The Moon orbits Earth faster than Earth rotates.
E) The lunar month is based on the Moon's orbit, while the sidereal month is based on Earth's orbit.
B) The Moon has to complete more than one full orbit around Earth to complete the cycle of lunar phases.
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Addition by 1. Components: Vector 
has a magnitude of 6.0 m and points 30° north of east. Vector 
has a magnitude of 4.0 m and points 30° west of south. The resultant vector 
+ 
is given by
A. 2.7 m at an angle of 8.3° south of east. B. 2.7 m at an angle of 8.3° east of south. C. 3.2 m at an angle of 8.3° east of south. D. 3.2 m at an angle of 8.3° south of east. E. 2.3 m at an angle of 8.3° south of east.
John's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and erect, what is the focal length of the mirror?
A) 10 cm B) 20 cm C) 30 cm D) 40 cm E) 50 cm
What is the magnitude of the free-fall acceleration at a point that is a distance 2R above the surface of the Earth, where R is the radius of the Earth?
a. 4.8 m/s2 b. 1.1 m/s2 c. 3.3 m/s2 d. 2.5 m/s2 e. 6.5 m/s2
If a material is strain-rate sensitive, when the strain rate increases, the applied _________must increase drastically.
Fill in the blank(s) with the appropriate word(s).