Biology Forums - Study Force

Spring tides occur when the Moon is in
  a) new phase.
  b) waxing gibbous phase.
  c) first-quarter phase.
  d) waning gibbous phase.

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[Ques. 2] A child bounces a 50-gram superball on the sidewalk. The velocity of the superball changes from 21 m/s downward to 19 m/s upward. If the contact time with the sidewalk is 1/800 s, what is the magnitude of the force exerted on the superball by the sidewalk?

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[Ques. 3] A solar eclipse occurs when the Moon is at or
  near
  a) full phase.
  b) new phase.
  c) first-quarter phase.
  d) last-quarter phase.

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[Ques. 4] 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.

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[Ques. 5] 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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[Ques. 6] The phase of the Moon observed on the overhead
  meridian at 10 A.M. local solar time is a
  a) waning crescent moon.
  b) waxing crescent moon.
  c) waxing gibbous moon.
  d) waning gibbous moon.

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[Ques. 7] At what local solar time will the new phase of the
  Moon be on the overhead meridian?
   
  a) 6 a.m.
  b) 6 p.m.
  c) 12 noon.
  d) 12 midnight.
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[Ques. 8] In an elastic collision between two bodies of equal mass, with body 2 initially at rest, body 1 moves off at angle  relative to the direction of its initial velocity and body 2 at angle . The sine of the sum of  and , sin( + ), is equal to
 a. 0.
  b. 0.500.
  c. 0.707.
  d. 0.866.
  e. 1.00.

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[Ques. 9] Which one of the following is not a surface feature
  of the Moon?
  a) a maria.
  b) A ray.
  c) A node.
  d) A rill.

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[Ques. 10] Stan argues that momentum cannot be conserved when a collision is not a head-on collision. Rachel insists it is conserved because each body receives an impulse of equal magnitude. Rachel is correct because
 a. each body exerts an equal and opposite force on the other during the collision.
  b. the forces act during equal time intervals.
  c. the law of conservation of momentum for an isolated system is a vector equation.
  d. of all of the above.
  e. of only (a) and (b) above.

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