Unformatted text preview: ht and
comes to a momentary stop
when it reaches a height
y = 11.1 m from the floor.
The ramp is not frictionless
The ramp is not frictionless.
What is the increase ∆Eth in
the thermal energy of the
beagle and the ramp because
Andrei Sirenko, NJIT the sliding?
of Two industrial spies sliding an initially stationary 225 kg floor safe a displacement
d of magnitude 8.50 m, straight toward their truck. The push F1 of spy 001 is
12.0 N, directed at an angle of 30º downward from the horizontal; the pull F2 of
spy 002 is 10.0 N, directed at 40º above the horizontal. The magnitudes and
directions of these forces do not change as the safe moves, and the floor and safe
make frictionless contact.
a) What is the net work done on the safe by the
forces F1 and F2 during the displacement d ? b) During the displacement, what is the work Wg
done on the safe by the gravitational force Fg
and what is the work done on the safe by the
normal force N from the floor?
c) Lecture 9 The safe is initially stationary. What is its
speed vf at the end of the 8.50 m
displacement? Andrei Sirenko, NJIT 34...
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