The mass of a plane when taking off is 40 tons. knowing that the gravitational field strength at the surface of Earth is 9.8 N/kg, the weight of this plane at 9 km high would be
a) About 40 000 N
b) Exactly 392000 N
c) Slightly more than 392000 N
d) Slightly less than 392000 N
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Answer:
option D
Explanation:
m=40tons=40×1000=40000 kgs
g=9.8 N/kg
h=9 Km
w=mgh
w= 40000×9.8×9 =3528000
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