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PROBLEM 11.188
A golfer hits a ball with an initial velocity of
magnitude 0
v at an angle
with the
horizontal. Knowing that the ball must clear
the tops of two trees and land as close as
possible to the flag, determine 0
v and the
distance d when the golfer uses (a) a six-iron
with 31 ,
(b) a five-iron with 27 .
PROBLEM 11.188 (Continued)
PROBLEM 11.189
As the truck shown begins to back up with a constant
acceleration of
2
4 ft/s ,
the outer section B of its boom starts to
retract with a constant acceleration of
2
1.6 ft/s
relative to the
truck. Determine (a) the acceleration of section B, (b) the
velocity of section B when
2t
s.
PROBLEM 11.190
A velodrome is a specially designed track used in
bicycle racing. If a rider starts from rest and accelerates
between points A and B according to the relationship
at = (11.46 – 0.01878 v2) m/s2, what is her acceleration
at point B?
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PROBLEM 11.191
Sand is discharged at A from a conveyor belt and falls onto the
top of a stockpile at B. Knowing that the conveyor belt forms
an angle 25
with the horizontal, determine (a) the speed
v0 of the belt, (b) the radius of curvature of the trajectory
described by the sand at Point B.
PROBLEM 11.191 (Continued)
PROBLEM 11.192
The end Point B of a boom is originally 5 m from fixed Point A
when the driver starts to retract the boom with a constant radial
acceleration of 2
1.0 m/sr
and lower it with a constant
angular acceleration 2
0.5 rad/s .
At 2 s,t determine
(a) the velocity of Point B, (b) the acceleration of Point B,
(c) the radius of curvature of the path.
PROBLEM 11.192 (Continued)
PROBLEM 11.193
A telemetry system is used to quantify
kinematic values of a ski jumper
immediately before she leaves the ramp.
According to the system 500 ft,r
105 ft/s,r
2
10 ft/s ,r
25 ,
0.07 rad/s,
2
0.06 rad/s .
Determine
(a) the velocity of the skier immediately
before she leaves the jump, (b) the
acceleration of the skier at this instant,
(c) the distance of the jump d neglecting lift
and air resistance.
PROBLEM 11.193 (Continued)
