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PROBLEM 11.97
An airplane used to drop water on brushfires is flying
horizontally in a straight line at 180 mi/h at an altitude of
300 ft. Determine the distance d at which the pilot should
release the water so that it will hit the fire at B.
PROBLEM 11.98
A ski jumper starts with a horizontal take-off velocity of 25
m/s and lands on a straight landing hill inclined at o
30 .
Determine (a) the time between take-off and landing, (b) the
length d of the jump, (c) the maximum vertical distance
between the jumper and the landing hill.
PROBLEM 11.99
A baseball pitching machine
“throws” baseballs with a
horizontal velocity v0. Knowing
that height h varies between 788
mm and 1068 mm, determine
(a) the range of values of v0, (b) the
values of
corresponding to
h 788 mm and h 1068 mm.
PROBLEM 11.99 (Continued)
PROBLEM 11.100
While delivering newspapers, a
girl throws a newspaper with a
horizontal velocity
v
0
. Determine
the range of values of v
0
if the
newspaper is to land between
Points B and C.
PROBLEM 11.101
Water flows from a drain spout with an initial velocity of
2.5 ft/s at an angle of 15° with the horizontal. Determine the
range of values of the distance d for which the water will
enter the trough BC.
PROBLEM 11.102
In slow pitch softball the
underhand pitch must reach a
maximum height of between 1.8
m and 3.7 m above the ground. A
pitch is made with an initial
velocity of magnitude 13 m/s
at an angle of with the
horizontal. Determine (a) if the
pitch meets the maximum height
requirement, (b) the height of the
ball as it reaches the batter.
0
v
33
PROBLEM 11.103
A volleyball player serves the
ball with an initial velocity
v
0
of
magnitude 13.40 m/s at an angle
of 20° with the horizontal.
Determine (a) if the ball will
clear the top of the net, (b) how
far from the net the ball will land.
PROBLEM 11.104
A golfer hits a golf ball with an initial velocity of 160 ft/s at an angle of 25° with the horizontal. Knowing that
the fairway slopes downward at an average angle of 5°, determine the distance d between the golfer and Point B
where the ball first lands.
PROBLEM 11.105
A homeowner uses a snowblower to clear his
driveway. Knowing that the snow is discharged
at an average angle of 40° with the horizontal,
determine the initial velocity v
0
of the snow.
