A Ford Taurus driven $15,000$ miles a year will use about $715$ gallons of gasoline compared to a Ford Explorer that would use $940$ gallons. About $19.7 \mathrm{~lbm}$ of $\mathrm{CO}_{2}$, which causes global warming, is released to the atmosphere when a gallon of gasoline is burned. Find the extra amount of $\mathrm{CO}_{2}$ production a man is responsible for during a $5$-year period if he trades his Taurus for an Explorer.

The 60-W fan of a central heating system is to circulate air through the ducts. The analysis of the flow shows that the fan needs to raise the pressure of air by 50 Pa to maintain flow. The fan is located in a horizontal flow section whose diameter is 30 cm at both the inlet and the outlet. Determine the highest possible average flow velocity in the duct.

The 60-W fan of a central heating system is to circulate air through the ducts. The analysis of the flow shows that the fan needs to raise the pressure of air by 50 Pa to maintain flow. The fan is located in a horizontal flow section whose diameter is 30 cm at both the inlet and the outlet. Determine the highest possible average flow velocity in the duct.

A university campus has 200 classrooms and 400 faculty offices. The classrooms are equipped with 12 fluorescent tubes, each consuming $110 \mathrm{~W}$, including the electricity used by the ballasts. The faculty offices, on average, have half as many tubes. The campus is open $240$ days a year. The classrooms and faculty offices are not occupied an average of $4 \mathrm{~h}$ a day, but the lights are kept on. If the unit cost of electricity is $\$ 0.082 / \mathrm{kWh}$, Find how much the campus will save a year if the lights in the classrooms and faculty offices are turned off during unoccupied periods.

A university campus has 200 classrooms and 400 faculty offices. The classrooms are equipped with 12 fluorescent tubes, each consuming 110 W. including the electricity used by the ballasts. The faculty offices, on average, have half as many tubes. The campus is open 240 days a year. The classrooms and faculty offices are not occupied an average 4 h a day, but the lights are kept on. If the unit cost of electricity is $0.11/kWh, determine how much the campus will save a year if the lights in the classrooms and faculty offices are turned off during unoccupied periods.

Find the power required for a $2000-\mathrm{kg}$ car to climb a $100-\mathrm{m}$-long uphill road with a slope of $30^{\circ}$ (from horizontal) in $10 \mathrm{~s}(a)$ at a constant velocity, $(b)$ from rest toa final velocity of $30 \mathrm{~m} / \mathrm{s}$, and (c) from $35 \mathrm{~m} / \mathrm{s}$ to a final velocity of $5 \mathrm{~m} / \mathrm{s}$. Disregard friction, air drag, and rolling resistance.

Determine the power required for a $1150$-$~\mathrm{kg}$ car to climb a $100$-$~\mathrm{m}$-long uphill road with a slope of $30^\circ$ (from horizontal) in $12 \mathrm{~s}$

(a) at a constant velocity,

(b) from rest to a final velocity of 30 m/s, and

(c) from 35 m/s to a final velocity of 5 m/s. Disregard friction, air drag, and rolling resistance.

A spherical soap bubble with a surface-tension of 0.005 lbf/ft is expanded from a diameter of 0.5 in to 3.0 in. How much work, in Btu, is required to expand this bubble?

A model aircraft internal-combustion engine produces $10 \mathrm{~W}$ of power. How much power is this in $(a) \mathrm{lbf} \cdot \mathrm{ft} / \mathrm{s}$ and $(b) \mathrm{hp}$ ?

A model aircraft internal-combustion engine produces 10 W of power. How much power is this in (a) lbf.ft/s and (b) hp?

Consider a river flowing toward a lake at an average velocity of $3 \mathrm{~m} / \mathrm{s}$ at a rate of $500 \mathrm{~m}^{3} / \mathrm{s}$ at a location $90 \mathrm{~m}$ above the lake surface. Find the total mechanical energy of the river water per unit mass and the power generation potential of the entire river at that location.

Consider a river flowing toward a lake at an average velocity of 3 m/s at a rate of 500 m^3/s at a location 90 m above the lake surface. Determine the total mechanical energy of the river water per unit mass and the power generation potential of the entire river at that location.

Consider a river flowing toward a lake at an aver- age velocity of 3 m/s at a rate of $500 m^3/s$ at a location 90 m above the lake surface. Determine the total mechanical energy of the river water per unit mass and the power generation potential of the entire river at that location.

What is the greenhouse effect? How does the excess $\mathrm{CO}_{2}$ gas in the atmosphere cause the greenhouse effect? What are the potential long-term consequences of greenhouse effect? How can we combat this problem?