What was Wegener's hypothesis called?

a. seafloor spreading

b. plate tectonics

c. continental drift

d. slab pull

It takes 100,000 years for a plate to move about 2 kilometers. What is the rate of motion in centimeters per year?

Find the number of possible license plate numbers (with no letters or digits excluded) for each of the following conditions:

6 digits

A parallel-plate capacitor has capacitance $C_{0}=5.00 \mathrm{pF}$ when there is air between the plates. The separation between the plates is $1.50 \mathrm{~mm}$. (a) What is the maximum magnitude of charge $Q$ that can be placed on each plate if the electric field in the region between the plates is not to exceed $3.00 \times 10^{4} \mathrm{~V} / \mathrm{m}$ ? (b) A dielectric with $K=2.70$ is inserted between the plates of the capacitor, completely filling the volume between the plates. Now what is the maximum magnitude of charge on each plate if the electric fieldbetween the plates is not to exceed $3.00 \times 10^{4} \mathrm{~V} / \mathrm{n}$ ? maximum magnitude of charge on each plate if the electric field between the plates is not to exceed $3.00 \times 10^{4} \mathrm{~V} / \mathrm{n}$ ?

If you observed a beam of particles being bent toward a negatively charged plate, what might you conclude?

A parallel-plate capacitor has circular plates of 8.20 cm radius and 1.30 mm separation. (a) Calculate the capacitance.

A parallel-plate capacitor with air between the plates and plate separation distance d is connected to a battery that maintains a potential difference $V _ { \text { batt } }$ between the plates. Sketch a graph of V as a function of x when x is defined as position between the plates, running from x = 0 at the surface of the positively charged plate to x = d at the surface of the other plate. Plot the points x = 0, x = d/4, x = d/2, x = 3d/4, and x = d. A slab that is made of a dielectric material and has a thickness of d/2 is inserted between the plates such that the midpoint of slab thickness is at the position d/2 in the space between the plates. Sketch a graph of V(x) for the capacitor now. Comment on how your graph is affected by the magnitude of the bound charge induced on the surface of the dielectric slab.

The assembly shown in Figure P5.45 consists of a steel $\left[E_1=30,000 \mathrm{ksi} ; A_1=1.25 \mathrm{in}^2\right]$ rod (1), a rigid bearing plate $B$ that is securely fastened to rod (1), and a bronze $\left[E_2=15,000 \mathrm{ksi}\right.$; $A_2=3.75 \mathrm{in}^2{ }^2$ ] post (2). The yield strengths of the steel and bronze are $62 \mathrm{ksi}$ and $75 \mathrm{ksi}$, respectively. A clearance of $0.125 \mathrm{in}$. exists between the bearing plate $B$ and bronze post (2) before the assembly is loaded. After a load of $P=65$ kips is applied to the bearing plate, determine (a) the normal stresses in bars (1) and (2). (b) the factors of safety with respect to yield for each of the members. (c) the vertical displacement of bearing plate $B$.

At $t=0$, the $0.6$-slug thin plate has angular velocity $\omega=101+10 \mathrm{~J}(\mathrm{rad} / \mathrm{m})$ and is subjected to the force $\mathbf{F}=$ $-10 \mathrm{k}$ (Ib) acting at the point $(0,6,0)$ in. No other forces or couples act on the plate. What are the components of its angular acceleration at that instant?

Determine the cm of a thin, uniform, semicircular plate, Fig. 9-61. [Hint: Integrate; see Problem 63.

Preganglionic sympathetic neurons develop from (a) neural crest, (b) neural tube, (c) alar plate, (d) endoderm

Determine the mass of inertia about the y-axis for the parabolic plate of the previous problem. State the radius of gyration about the y-axis.

Two triangular plates are congruent. The area of one of the plates is 60 square inches.What is the area of the other plate? Explain.

A parallel-plate capacitor has circular plates of 8.20 cm radius and 1.30 mm separation. Calculate the capacitance.