Determine the stress at points $A$ and $B(a)$ for the loading shown, (b) if the $60-\mathrm{kN}$ loads applied at points $2$ and $3$ are removed.

A tank contains 400 gal of brine in which 100 lb of salt are dissolved. Fresh water runs into the tank at a rate of 2gal/min. The mixture, kept practically uniform by stirring, runs out at the same rate. How much salt will there be in the tank at the end of 1 hour?

Suppose that $n \neq 0$ and $n \neq 1$. Show that the substitution $v = y ^ { 1 - n }$ transforms the Bernoulli equation $d y / d x + P ( x ) y = Q ( x ) y ^ { n }$ into the linear equation

$$\frac { d v } { d x } + ( 1 - n ) P ( x ) v ( x ) = ( 1 - n ) Q ( x )$$

Determine the stress at points $A$ and $B(a)$ for the loading shown, $(b)$ if the $60-\mathrm{kN}$ loads are applied at points $1$ and $2$ only.

Solve the vertical portion of the press shown consists of a rectangular tube having a wall thickness $t=\frac{1}{2}$ $\mathrm{in}$. Knowing that the press has been tightened on wooden planks being glued together until $P=$ 6 $\mathrm{kips}$, determine the stress (a) at point $A,(b)$ point $B$. assuming that $t=\frac{3}{8}$ $\mathrm{in}$.

The vertical portion of the press shown consists of a rectangular tube having a wall thickness $t=\frac{1}{2}$ $\mathrm{in}$. Knowing that the press has been tightened on wooden planks being glued together until $P=$ 6 $\mathrm{kips}$, determine the stress (a) at point $A,(b)$ point $B$.

Knowing that the magnitude of the horizontal force P is $8 \mathrm{~kN}$, determine the stress at

(a) point A,

(b) point B.

State the general multiplication rule.

What does a finely crystalline or glassy igneous texture indicate in geology?

Coarsely crystalline igneous textures indicate that:

A. there was a lot of gas in the magma

B. the rock cooled quickly

C. the rock broke apart as it flowed

D. the rock cooled slowly

E. the ash and pumice were hot and became compacted

How does iron formation form?

A. evaporation of water in a lake or sea

B. accumulation of microscopic organisms composed of calcium carbonate

C. precipitation from seawater early in Earth's history

D. accumulation of silica-rich organisms or mixing of seawater and groundwater

A nylon spacing bar has the cross section shown. Knowing that the allowable stress for the grade of nylon used is $24 \mathrm{~MPa}$, determine the largest couple $\mathbf{M}_{2}$ that can be applied to the bar.

At noon a car starts from rest at point $A$ and proceeds at constant acceleration along a straight road toward point $B$. If the car reaches $B$ at $12:50$ P.M. with a velocity of $60$ mi/h, what is the distance from $A$ to $B$?

As many as three axial loads each of magnitude $P=10 \mathrm{~kips}$ can be applied to the end of a $\mathrm{W}8$ $\times 21$ rolled-steel shape. Detertnine the stress at point $A(a)$ for the loading shown, $(b)$ if loads are applied at points $1$ and $2$ only.