Biology Forums - Study Force

Two boys in a canoe toss a baseball back and forth. What effect will this have on the canoe? Neglect (velocity-dependent) frictional forces with water or air.
 a. None, because the ball remains in the canoe.
  b. The canoe will drift in the direction of the boy who throws the ball harder each time.
  c. The canoe will drift in the direction of the boy who throws the ball with less force each time.
  d. The canoe will oscillate back and forth always moving opposite to the ball.
  e. The canoe will oscillate in the direction of the ball because the canoe and ball exert forces in opposite directions upon the person throwing the ball.

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[Ques. 2] The true period of revolution of any planet is
  a) the synodic period.
  b) the sidereal period.
  c) given in astronomical units.
  d) always exactly one year.

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[Ques. 3] If you know the impulse that has acted on a body of mass m you can calculate
 a. its initial velocity.
  b. its final velocity.
  c. its final momentum.
  d. the change in its velocity.
  e. its acceleration during the impulse.

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[Ques. 4] Sidereal period is defined as the time interval between two successive conjunctions of a planet with
  a) the Sun as observed from Earth.
  b) Earth as observed from the Sun.
  c) any other planet besides Earth.
  d) any star other than the Sun.

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[Ques. 5] The planet with the largest diameter is
  a) Earth.
  b) Jupiter.
  c) Mars.
  d) Neptune.

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[Ques. 6] When two bodies of different masses collide, the impulses they exert on each other are
 a. equal for all collisions.
  b. equal but opposite for all collisions.
  c. equal but opposite only for elastic collisions.
  d. equal but opposite only for inelastic collisions.
  e. equal but opposite only when the bodies have equal but opposite accelerations.

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[Ques. 7] The planet whose orbit lies nearest to the Sun is
  a) Mercury.
  b) Venus.
  c) Pluto.
  d) Mars.

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[Ques. 8] The law of conservation of momentum applies to a collision between two bodies since
 a. they exert equal and opposite forces on each other.
  b. they exert forces on each other respectively proportional to their masses.
  c. they exert forces on each other respectively proportional to their velocities.
  d. they exert forces on each other respectively inversely proportional to their masses.
  e. their accelerations are proportional to their masses.

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[Ques. 9] The average density of the Sun is
  a) less than the density of water.
  b) greater than the density of water but less than the average density of Earth.
  c) greater than the average density of Earth but less than the density of iron.
  d) greater than the density of any known element found on Earth.

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[Ques. 10] One of the predictions of Kepler's laws of planetary
  motion is that
  a) the planets move in circular orbits.
  b) for a non-circular orbit, the closer a planet is to the Sun the faster it travels.
  c) planets nearer the Sun have the longest orbital periods.
  d) all planets move in elliptical orbits around Earth.
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I can't even begin to explain how much your help meant to me.

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Thanks!