The zeroth law of thermodynamics pertains to what relational condition that may exist between two systems?
a. zero net forces
b. zero velocities
c. zero temperature
d. thermal equilibrium
d
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Fluid Flow: Water flows through a horizontal pipe of cross-sectional area 10.0 cm2 at a pressure of 0.250 atm with a flow rate is 1.00 L/s. At a valve, the effective cross-sectional area of the pipe is reduced to 5.00 cm2. What is the pressure at the valve? The density of water is 1000 kg/m3, and treat it as an ideal incompressible fluid.
A. 0.110 atm B. 0.235 atm C. 0.200 atm D. 0.157 atm E. 7700 Pa
The electric field in the region defined by the y-z plane and the positive x axis is given by E = ax, where a is a constant. (There is no field for negative values of x.) As x increases in magnitude, relative to V = 0 at the origin, the electric potential in the region defined above is
A. a decreasing function proportional to ?|x2|. B. a decreasing function proportional to ?|x|. C. constant. D. an increasing function proportional to +|x|. E. an increasing function proportional to +|x2|.
Which of these gases is least abundant in our atmosphere?
A) hydrogen B) nitrogen C) argon D) oxygen E) carbon dioxide
The metric prefix that means one thousand (1000) is
a. kilo-. b. centi-. c. mega-. d. milli-.