A uniform sphere of radius R and mass M rotates freely about a horizontal axis that is tangent to an equatorial plane of the sphere, as shown below. The rotational inertia of the sphere about this axis is
? d
?
a.
.
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A soda-lime glass tube made out of the material in Figure 9.3 is in service in a chemical-processing plant at 395°C, and it is subject to a tensile stress of 10 MPa. The elastic modulus of the glass at this temperature is equal to 40 GPa. Use a Maxwell solid model to answer the following, and assume that the glass behaves as a Newtonian fluid (n=1).
(a) At the instant the glass tube is placed in service, at t=0, what is the strain of the tube? (b) After one year of service, what is the total strain of the tube?
The diagram below shows three approximate locations of the sun along the western horizon. Which number indicates the location of the sun at sunset on autumnal equinox for an observer at a latitude of 45° N?
a. 1
b. 2
c. 3
d. The sun will set in the east for an observer in the northern hemisphere.
e. The sun will not set on autumnal equinox at this latitude.
Molecular Bonds: Covalent bonding is due to
A. the sharing of electrons between atoms. B. the transfer of electrons between atoms. C. unequal charge distributions around neutral molecules. D. atoms bonding to hydrogen molecules.
In most cases, which expands more for comparable changes in temperature?
A) solids. B) liquids. C) gases. D) all expand about equally.