When a 500-N parachutist opens his chute and experiences 800 N of air resistance, the net force on him is
A) 300 N downward.
B) 500 N downward.
C) 800 N downward.
D) 300 N upward.
E) 500 N upward.
Answer: D
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Fill in the blank(s) with the appropriate word(s).
Two people are talking at a distance of 3.0 m from where you are and you measure the sound intensity as 1.1 × 10-7 W/m2. Another student is 4.0 m away from the talkers
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Determine the heat transfer and fin efficiency for a copper fin shown in Figure 2-72. The fin can be assumed to be very long and its base temperature taken as 200ºF.
