Question :
81. Which of the following characterizes the net force a : 2102183
81. Which of the following characterizes the net force on a particle falling through a fluid at its terminal speed?
A. It is at a maximum.
B. It is upwards.
C. It is downwards.
D. It is zero.
82. A container is filled with water and the pressure at the container bottom is P. If the container is instead filled with oil having specific gravity 0.80, what new bottom pressure results?
A. a pressure < P
B. the same pressure P
C. a pressure > P
D. This is unable to be determined with the information given.
83. A container is filled with water and the pressure at the bottom of the container is P. Then the container is emptied halfway and topped off with oil of density 0.80 ´ 103 kg/m3, which floats on top of the water. What is the pressure at the bottom of the container now?
A. a pressure < P
B. the same pressure P
C. a pressure > P
D. This is unable to be determined with the information given.
84. At a pressure of 1 atmosphere a column of mercury in a barometer is supported to the height h = 0.76 m. The density of mercury is 13.6 ´ 103 kg/m3. A barometer of similar design filled with water would support a column of water how high at a pressure of 1 atmosphere?
A. more than ten times h
B. about 1.36 h
C. less than one tenth h
D. the same height h
85. When an artery gets a constricted region due to plaque, how does the pressure in this region compare to the pressure in an unconstricted region adjacent?
A. Since this is a closed system, the pressure is the same in both regions.
B. In the constricted region the blood moves at a higher speed than in the unconstricted region resulting in an increased pressure.
C. In the constricted region the blood moves at a higher speed than in the unconstricted region resulting in a decreased pressure.
D. In the constricted region the blood moves at a lower speed than in the unconstricted region resulting in an increased pressure.
86. An ice cube with a small solid steel sphere frozen inside floats in a glass of water filled to the brim. What happens to the level of water in the glass as a result of the ice melting?
A. It goes up, overflowing.
B. It stays the same.
C. It goes down.
D. It depends on air pressure, thus the answer is indeterminate.
