If iron floats in liquid mercury, then the specific gravity of iron is
a. less than that of mercury.
b. greater than that of mercury.
c. about equal to that of mercury.
d. in no way related to that of mercury.
a
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Hydrogen gas seems to have a diffusivity of about 2.6 x 10^-13 m^2/s when diffusing into iron at 770 K. What would you expect the rate of diffusion or mass flow rate per unit area of hydrogen to be when stored in an iron container at 5 atmospheres pressure, assuming the density of hydrogen at 1 mm in the iron from the containing surface to be 5% of the normal hydrogen density, given by p/RT?
What will be an ideal response?
In the fission theory of the Moon's origin
a. the Moon broke from a rapidly spinning Earth b. the Earth and its Moon formed from the same cloud of matter c. the Moon formed elsewhere in the solar nebula and was later captured by Earth. d. the Moon formed when a very massive planetesimal smashed into the young Earth.
State Newton's 1st law in your own words
What will be an ideal response?
The molecular weight of nitrogen, N2, is 28 g/mol. What is the rms speed of nitrogen molecules in a cooler at 8.0°C? The Boltzmann constant is 1.38 × 10-23 J/K and NA = 6.022 × 1023 molecules/mol
A) 450 m/s B) 500 m/s C) 550 m/s D) 600 m/s E) 650 m/s