[o[2].[2] A parachute opens during the spacecraft’s descent through the atmosphere. Figure 2 shows the parachute—spacecraft system, with the open parachute displacing
the atmospheric gas. This causes the system to decelerate.
Figure 2
_--» displacement of gas

parachute — \
direction \
of travel \

/
. . ——~ spacecraft
displacement of gas
Explain, with reference to Newton's laws of motion, why displacing the atmospheric
gas causes a force on the system and why this force causes the system to
decelerate.
[4 marks]

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.