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The figure shows three forces applied to a trunk that moves leftward by 3.44 m over a frictionless floor. The force magnitudes are
F1 = 4.94 N, F2 -8.81 N, and F3 - 2.72 N, and the indicated angle is 8 - 60° (a) During the displacement, what is the network done on
the trunk by the three applied forces, the gravitational force, and the normal force? (b) Is there a net transfer of energy to or from
the trunk? (c) Does the kinetic energy of the trunk increase or decrease?
(a) Number
Units
(b)
(c)
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Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. which of the following best describes how such a telephone is able to transmit and receive information? a. the cellular telephone transmits, receives, and encodes information using only sound waves. b. the cellular telephone transmits, receives, and encodes information using only electromagnetic waves. c. the cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound. d. the cellular telephone transmits information by sound waves to a receiver which then encodes them and produces electromagnetic waves.