Two pipes A and B can fill a tank in 24 minutes and 32 minutes, respectively. Initially, both pipes are opened simultaneously. After how many minutes should pipe B be turned off so that the tank is full in 18 minutes?

Evalute the rate of heat loss per meter from pressurized water flowing at $200^{\circ} \mathrm{C}$ through a $10-\mathrm{cm}-\mathrm{ID}$ pipe at a velocity of $3 \mathrm{~m} / \mathrm{s}$. The pipe is covered with a 5 -cm-thick layer of $85 \%$ magnesia wool with an emissivity of $0.5$. Heat is transferred to the surroundings at $20^{\circ} \mathrm{C}$ by natural convection and radiation. Draw the thermal circuit and state all assumptions.

Evaluate the expression for the given value of the variable. 32.4/x for x = -1.8

The $10 \mathrm{~cm}$ galvanized-steel pipe is $1000 \mathrm{~m}$ long and discharges water into the atmosphere. The pipeline has an open globe valve and four threaded elbows; $h_1=3 \mathrm{~m}$ and $h_2=15 \mathrm{~m}$. What is the discharge, and find the pressure at $A$, the midpoint of the line?

Evaluate the expression for the given value of the variable. 9.7/x for x = -0.5

Liquid $(\mathrm{S}=1.2)$ enters the "black sphere" through a 2 in. pipe with a velocity of $50\ \mathrm{ft} / \mathrm{s}$ and pressure of $60 \mathrm{psig}$. It leaves the sphere through two jets as shown in the given figure. The velocity in the vertical jet is $100\ \mathrm{ft} / \mathrm{s}$, and its diameter is 1 in. The other jet's diameter is also 1 in. What force through the 2 in. pipe wall is required in the $x$ - and $y$-directions to hold the sphere in place? Consider the sphere plus the liquid inside it weighs $200\ \mathrm{lbf}$.

A string has a length of $1.5 \mathrm{~m}$, a linear mass density $\mu=0.008 \mathrm{~kg} / \mathrm{m}$, , and a tension of $120 \mathrm{~N}$. If the air temperature is $T=22^{\circ} \mathrm{C}$, what should the length of a pipe open at hoth ends for it to have the same frequency for the $n=3$ mode?

A deceased person

Draw a condensed structural formula for each of the following hydrocarbons. a. 2-butyne b. 3,4-dimethyl-2-pentene c. 1,6-heptadiene d. 1-buten-3-yne

What must be the pressure difference between the two ends of a $1.6 \mathrm{~km}$ section of pipe, $29 \mathrm{~cm}$ in diameter, if it is to transport oil $\left(\rho=950 \mathrm{~kg} / \mathrm{m}^3, \eta=0.20 \mathrm{~Pa} \cdot \mathrm{s}\right)$ at a rate of $650 \mathrm{~cm}^3 / \mathrm{s}$ ?

Find the indicated term of the geometric sequence (a) using the table feature of a graphing utility and (b) algebraically. $a_{1}=7, r=\sqrt{2},$ 14th term.

Show that the power needed to drive a fluid through a pipe with uniform cross-section is equal to the volume rate of flow, $Q$, times the pressure difference, $P_1-P_2$. Ignore viscosity.

Nitrogen gas flowing in a 50-mm-diameter pipe at 15$^{\circ} \mathrm{C}$ and 200 kPa, at the rate of 0.05 kg/s, encounters a partially closed valve. If there is a pressure drop of 30 kPa across the valve and essentially no temperature change, what are the velocities upstream and downstream of the valve?

Find the sum of each of the following. The positive two-digit integers that are not divisible by 3