In a cross between a strain of large guinea pigs and a strain of small guinea pigs, the F$_1$ are phenotypically uniform, with an average size about intermediate between that of the two parental strains. Among 1014 F$_2$ individuals, 3 are about the same size as the small parental strain and 5 are about the same size as the large parental strain. How many gene pairs are involved in the inheritance of size in these strains of guinea pigs?

How is a strain different from a sprain?

What current has to flow in a straight wire to produce the same energy density at a point 4.00 cm from the wire?

The square plate is deformed into the shape shown by the dashed line. Determine the average normal strain along diagonal $A C$ and the shear strain of point $E$ with respect to the $x$ and $y$ axes.

For storing wind energy or solar energy, flywheels have been suggested. The amount of energy that can be stored in a fly- wheel depends on the density and tensile strength of the mate- rial making up the flywheel and for a given weight one wants the lowest density strong material available. Can you make this plausible? (See “Flywheels,” by R. F. Post and S. F. Post, $\it{Scientific~ American}$, December $1973$, p. $17$.)

a) Determine the electric-field energy density at a location from an isolated point charge  $q=8.00 \mathrm{nC}$ that is $12.0 \mathrm{~cm}$  in size. b) What impact would a change in the point charge in part (a) to $q=-8.00$$$\mathrm{nC}$ have on the electric-field energy density? Describe your thinking.

The process by which one strain of bacterium is apparently changed into another strain is called a. transcription. $\hspace{1.3cm}$ c. duplication. b. transformation. $\hspace{1cm}$ d. replication.

The strain components $\varepsilon_x, \varepsilon_y$ and $\gamma_{x y}$ are given for a point in a body subjected to the plane strain. Determine the strain components $\varepsilon_n, \varepsilon_r$ and $\gamma_{n t}$ at the point if the $n-t$ axes are rotated with respect to the $x-y$ axes by the amount and in the direction indicated by the angle $\theta$. Sketch the deformed shape of the element.

Air undergoes dielectric breakdown at a field strength of $3 \mathrm{~MV} / \mathrm{m}$. Could you store energy in an electric field in air with the same energy density as gasoline?

The strain components $\varepsilon_x, \varepsilon_{y y}$ and $\gamma_{x y}$ are given for a point in a body subjected to plane strain. Find the strain components $\varepsilon_n, \varepsilon_{\Gamma}$ and $\gamma_{n t}$ at the point if the $n-t$ axes are rotated with respect to the $x-y$ axes by the amount and in the direction indicated by the angle $\theta$ shown . Sketch the deformed shape of the element.

The thin square plate shown in is uni formly deformed such that $\varepsilon_n=660 \mu \varepsilon, \varepsilon_t=910 \mu \varepsilon$, and $\gamma_{n t}=$ $830 \mu \mathrm{rad}$. Determine (a) the normal strain $\varepsilon_x$ in the plate. (b) the normal strain $\varepsilon_y$ in the plate. (c) the shear strain $\gamma_{x y}$ in the plate.

Describe the state of the F factor in an Hfr,

$$F^+,$$

and

$$F^-$$

strain.

How is strain different from stress ?

A solution is prepared by dissolving 5.85 grams of sodium chloride in water and diluting to 50.0 milliliters in a volumetric flask. A 10.00-milliliter sample of this solution is then added to a 100-milliliter volumetric flask to which water is then added to the mark. Calculate the molarity of the final solution.