up is +
a) gravity force down = weight = -m g = -1210*9.81 = -11870 N
b) F is positive up
F = m a = 1210(-1.4)
F = - 1696 N
c)gravity pushing down, helicopter pushing up
d)lift is up
lift - 11870 = m a = -1696
lift = 11870 - 1696 = 10176 N up
Hey! I've tried using equations such as weight=m*g for this problem, but I don't think I'm doing it right. Can someone help?
A helicopter was seen carrying a heavy bag of sand (1210.0 kg). A student figured that the acceleration of the sand bag then was 1.4 m/s2 in the downward direction.
a) What is in Newtons the weight of the sand bag? (Use the upward direction as positive.)
b) What is in Newtons the net force acting on the sand bag? (Use the upward direction as positive.)
c) If we ignore the effects of air resistance, how many forces were acting on the sand bag?
d) What is in Newtons the force the helicopter exerts on the sand bag? (Use the upward direction as positive.)
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