chapter 5 RAT Flashcards
Water pressure at the bottom of a lake depends on the lake’s
A. weight of water.
B. surface area.
C. depth.
D. all of these
A. weight of water
The buoyant force that acts on a 20,000-N ship is
A. somewhat less than 20,000 N.
B. 20,000 N.
C. more than 20,000 N.
D. dependent on whether it floats in salt or in fresh water.
A. somewhat less than 20,000 N
A floating duck displaces its own
A. volume of water.
B. weight of weight.
C. both of these
D. none of these
B. weight of water
A rock suspended by a weighing scale weighs 15 N out of water and 10 N when submerged in water. What is the buoyant force on the rock?
A. 5 N
B. 10 N
C.15 N
D. none of these
A. 5 N
The two caissons of the Falkirk Wheel in Scotland (the device that lifts and lowers ships) remain in balance when
A. both caissons are brim-filled with water.
B. ships of different weights float in each.
C. both caissons are brim-filled with water and a ship floats in only one.
D. all of these
D. all of these
To what depth must an inverted drinking glass be pushed beneath the water surface to squeeze the enclosed air to half its volume?
A. 76 cm
B. 10.3 m
C.14.7 m
D. 20.6 m
B. 10.3 m
Atmospheric pressure is caused by the atmosphere’s
A. density.
B. weight.
C. temperature.
D. relationship with solar energy.
B. weight
A hydraulic device multiplies force by 100. This multiplication is done at the expense of
A. energy, which is divided by 100.
B. the time during which the multiplied force acts.
C. the distance through which the multiplied force acts.
D. the mechanism providing the force.
C. the distance through which the multiplied force acts
The flight of a blimp best illustrates
A. Archimedes’ principle.
B. Pascal’s principle.
C. Bernoulli’s principle.
D. Boyle’s law.
A. Archimedes’ principle
As water in a confined pipe speeds up, the pressure it exerts against the inner walls of the pipe
A. increases.
B. decreases.
C. remains constant if flow rate is constant.
D. none of these
B. decreases
