A 188-pound astronaut in a training exercise experiences an acceleration of 7.2 g's. What is the net force (in newtons) acting on the astronaut?
a. 1,353.6 N b. 6,023.5 N
c. 59,030.5 N d. 13,536 N
b
RATIONALE: Three part problem. First convert lb to N W = mg = 188 [1 lb] = 188 [4.45 N] = 436.6 N Next change this weight to a mass. m = W/g = (436.6 N)/(9.8 m/s2) = 85.367 kg Finally, use Newton's 2nd Law. F = ma = (85.367 kg)(70.56 m/s2) = 6023.5 N [rounded to one decimal place]
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