Unlock document.
This document is partially blurred.
Unlock all pages and 1 million more documents.
Get Access
PROBLEM 11.116* (Continued)
max
tan 40.2484
xu
PROBLEM 11.117
The velocities of skiers A and B are
as shown. Determine the velocity
of A with respect to B.
PROBLEM 11.118
The three blocks shown move with constant velocities. Find the velocity of each
block, knowing that the relative velocity of A with respect to C is 300 mm/s upward
and that the relative velocity of B with respect to A is 200 mm/s downward.
PROBLEM 11.119
Three seconds after automobile B passes through the intersection shown,
automobile A passes through the same intersection. Knowing that the speed
of each automobile is constant, determine (a) the relative velocity of B with
respect to A, (b) the change in position of B with respect to A during a 4-s
interval, (c) the distance between the two automobiles 2 s after A has
passed through the intersection.
Copyright © McGraw-Hill Education. Permission required for reproduction or display.
PROBLEM 11.119 (Continued)
Auto B 44 ft/s
Bv
(44 ft/s)(5 s) 220 ft
BB
t rv
/BABA
rrr
Law of cosines
222
/
/
(132) (220) 2(132)(220) cos110
292.7 ft
BA
BA
r
r
Distance between autos 293 ft
PROBLEM 11.120
Shore-based radar indicates that a ferry leaves its slip with a
velocity
18 km/h
v
70°, while instruments aboard the
ferry indicate a speed of 18.4 km/h and a heading of 30° west
of south relative to the river. Determine the velocity of the
river.
PROBLEM 11.121
Airplanes A and B are flying at the same altitude and are
tracking the eye of hurricane C. The relative velocity of C
with respect to A is
/
350 km/h
CA v
75°, and the relative
velocity of C with respect to B is
/
400 km/h
CB v
40°.
Determine (a) the relative velocity of B with respect to A,
(b) the velocity of A if ground-based radar indicates that the
hurricane is moving at a speed of 30 km/h due north, (c) the
change in position of C with respect to B during a 15-min
interval.
PROBLEM 11.121 (Continued)
PROBLEM 11.122
Instruments in an airplane which is in level flight indicate that the velocity relative
to the air (airspeed) is 120 km/h and the direction of the relative velocity vector
(heading) is 70° east of north. Instruments on the ground indicate that the velocity of
the airplane (ground speed) is 110 km/h and the direction of flight (course) is 60°
east of north. Determine the wind speed and direction.
Problem 11.123
Knowing that at the instant shown
block B has a velocity of 2 ft/s to
the right and an acceleration of 3
ft/s
2
to the left, determine (a) the
velocity of block A, (b) the
acceleration of block A.
A
A
