d =

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d ½ g t2 d 5 m g 10 m/s2 ? t sqrt
(2d/g) t sqrt (1) t 1 second
Time to hit ground 1 second In that 1 second,
horizontal distance travelled 20m ? Horizontal
speed 20 m/s
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-- Questions --
MULTIPLE CHOICE. Choose the one alternative
that best completes the statement or answers the
question.
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1) An object is dropped and freely falls to the
ground with an acceleration of 1 g. If it is
thrown upward at an angle instead, its
acceleration will be A) 0 g. B) 1 g downward.
C) 1 g upward. D) larger than 1 g. E) none of
these. 2) A hunter on level ground fires a
bullet at an angle of 10 degrees below the
horizontal while simultaneously dropping another
bullet from the level of the rifle. Which bullet
will hit the ground first? A) the dropped one
B) Both hit at the same time. C) the fired one
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• 3) Which would require the greater change in the
  Earth's orbital speed (30 km/s) slowing down so
  the Earth crashes into the sun, or speeding up so
  the Earth escapes the sun?
• slowing down
• same each way
• C) speeding up
• 4) A projectile is thrown into the air at an
  angle of 50 degrees and lands on a target that is
  at the same level at which the projectile
  started. It will also land on the target if it
  is thrown at an angle of
• 40 degrees.
• B) 45 degrees.
• C) 55 degrees.
• D) 60 degrees.
• E) none of these.

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• 5) From Earth, one satellite appears to overtake
  another. The faster satellite is
• higher.
• lower.
• C) can't say.
• 6) A gun with a muzzle velocity of 100 m/s is
  fired horizontally from a tower. Neglecting air
  resistance, where will the bullet be 1 second
  later?
• A) 50 m down range
• B) 98 m down range
• C) 100 m down range
• D) 490 m down range
• E) none of these

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• 7) A ball player wishes to determine pitching
  speed by throwing a ball horizontally from an
  elevation of 5 m above the ground. The player
  sees the ball land 20 m down range. What is the
  player's pitching speed?
• A) about 5 m/s
• B) about 10 m/s
• C) about 20 m/s
• D) about 25 m/s
• E) none of these
• 8) An object is thrown vertically into the air.
  Because of air resistance, the time for its
  descent will be
• longer than the ascent time.
• B) equal to the ascent time.
• C) shorter than the ascent time.
• D) not enough information given to say.

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9) What prevents satellites such as the space
shuttle from falling? A) the absence of air drag
B) gravity C) centrifugal force D) centripetal
force E) Nothing they continually fall all
around the earth. 10) A "weightless" astronaut
in an orbiting shuttle is A) beyond the pull of
gravity. B) shielded from the Earth's
gravitational field. C) pulled only by
gravitation to the shuttle which cancels the
Earth's gravitational pull. D) like the shuttle,
pulled by Earth's gravitation. E) none of these.
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• 11) Earth satellites are typically more than 100
  km high so as to be above the Earth's
• gravitational field.
• atmosphere.
• C) both of these.
• 12) A rocket coasts in an elliptical orbit about
  the Earth. To attain escape velocity using the
  least amount of fuel in a brief firing time,
  should it fire off at the apogee, or at the
  perigee? (Hint Let "Fd change in KE" guide
  your thinking.)
• A) perigee, where it is closest and fastest
• B) apogee, where it is farthest and slowest
• C) same either location

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• 13) An airplane flies at 40 m/s at an altitude
  of 50 meters. The pilot drops a heavy package
  which falls to the ground. Where, approximately,
  does the package land relative to the plane's new
  position?
• A) beneath the plane
• B) 400 m behind the plane
• C) 500 m behind the plane
• D) more than 500 m behind the plane
• E) none of these.
• 14) Acceleration is greater for a satellite when
  it is at the
• same at both places.
• perigee.
• C) apogee.

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15) The radial velocity of an Earth satellite is
its velocity A) attributed to satellites moving
in any direction. B) parallel to the surface of
the Earth. C) perpendicular to the surface of
the Earth. D) none of these. 16) A satellite
in an elliptical orbit travels at constant A)
acceleration. B) velocity. C) speed. D) all of
these. E) none of these.
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-- Answers --
MULTIPLE CHOICE. The one alternative that best
completes the statement or answers the question.
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Chapter 10 1) Answer B 2) Answer C 3)
Answer A 4) Answer A 5) Answer B 6)
Answer C 7) Answer C 8) Answer A 9)
Answer E 10) Answer D 11) Answer B 12)
Answer A 13) Answer A 14) Answer B
15) Answer C 16) Answer E