The date is September 21 and the Moon is at full
phase. An observer who sees this moon on her
overhead meridian at this time
a) sees the Sun setting.
b) sees the Sun rising.
c) cannot see the Sun.
d) sees the Sun overhead.
Question 2
In an elastic collision between two bodies of mass m1 and m2, with m2 initially at rest, mass 1 moves off at angle relative to the direction of its initial velocity and mass 2 at angle . An exam paper shows the equations below: m1v1i 0 = m1v1f cos + m2v2f sin = m1v1f sin + m2v2f cos What error(s) has the student made?
a. In the first equation, m2v2f sin should be m2v2f cos.
b. In the second equation, m2v2f cos should be m2v2f sin.
c. In the second equation, the plus sign between the terms on the right should be a minus sign.
d. All of the errors listed above.
e. Only errors (a) and (b) above.
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