A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water (of density 1000 kg/m3 ) while suspended from a harness. Her apparent weight is now 21.2 N. What is her density?
A) 1040 kg/m3
B) 1030 kg/m3
C) 1050 kg/m3
D) 56.1 kg/m3
E) 960 kg/m3
Question 2
During World War I, Germany used a Big Bertha cannon to hurl shells into Paris 30 miles away. This gun also had a long barrel. What is the reason for using a long barrel in these guns?
A) To provide a larger ratio of kinetic energy to potential energy.
B) To reduce frictional losses.
C) To allow the force of the expanding gases from the gunpowder to act for a longer time.
D) To increase the force exerted on the bullet due to the expanding gases from the gunpowder.
E) To reduce the force exerted on the bullet due to the expanding gases from the gunpowder.
Lungs
Lungs
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