17) When you suddenly stand up after lying down for a while, your body may not
compensate quickly enough for the pressure changes and you might feel dizzy for a
moment. If the gauge pressure of the blood at your heart is 12.13 kPa and your body
doesn't compensate, what would the pressure be at your head, 45.3 cm above your
heart? (assume blood mass density = 1060 kg/m3)
5 ?
a) 4.54 kPa
b) 7.42 kPa
c) 201 kPa
d) 15.2 kPa
18) From the above question: If the gauge pressure of the blood at your heart is 12.13 kPa
and your body doesn't compensate, what would it be at your feet, 1.30 \times 10^2 cm below
your heart? (assume blood mass density = 1060 kg/m3)
a) 25.6 kPa
b) 4.53 kPa
c) 154 kPa
d) 0.23 kPa
19) For 2 moles of He gas inside a cylinder at 20 degrees Celsius: Find the total internal
energy of the He gas.
a) 7.3 kJ
b) 5.1 kJ
c) 0.25 kJ
d) 120 kJ
20) Find the average kinetic energy per He atom
a) $6.1 \times 10^{-21}$ J
b) $0.17 \times 10^{-21}$ J
c) $7.5 \times 10^{-20}$ J
d) $16 \times 10^{-20}$ J
21) At the beach, the sand (c ?700 J/kg-C°) and the ocean water (c = 4186 J/kg-C°) receive
the same amount of heat energy from the sun. Based solely on the specific heats of sand
and water, over any given period of direct sunlight, the temperature of the water should
rise more ____ than the temperature of the sand. The same argument could be
used to determine that the temperature of the water should drop more ____
than the temperature of the sand.
a) Quickly, slowly
b) Slowly, quickly
c) Quickly, quickly
d) Slowly, slowly
