An apple loses 4.5 kJ of heat as at cools per degree Celsius drop in its temperature. What is the amount of heat lost from the apple per degree Fahrenheit in its temperature?
\(Q/^{\circ}C=4.5\;kJ
\\Q/^{\circ}F=\frac{Q/^{\circ}C}{1.8}
\\=\frac{4.5}{1.8}
\\=2.5\;kJ\)
Therefore amount of heat lost is 2.5 kJ.
Consider an airplane in an accelerated climb. At a given instant in this climb, the specific excess power is 120 ft/s
Consider an airplane flying at 620 mi/h at 35,000 ft. Calculate its energy height.
For a turbojet-powered airplane with the altitude variation of thrust given by Eq. (3.19), show that as the altitude increases, the maximum velocity decreases.
The BD-5J is equipped with plain flaps. The airfoil section at the wing root is an NACA 64-212, and interestingly enough, it has a thicker section at the tip, an NACA 64-218.
For the BD-5J, calculate (a) The maximum value of CL/CD (b) The maximum value of CL^(1/ 2) /CD
In a cyclic process the net heat supplied is 70 kJ/s. What is the work obtained from the cycle?
A paddle wheel is used for stirring a liquid contained in a tank supplied 6000 kJ of work and during the stirring operation the tank lost 1500 kJ of heat to the surroundings. If the tank and liquid are considered as a system what will be its change in internal energy.
3 kg of steam in a piston -cylinder device at 400 kPa and 175 degree Celsius undergoes a mechanically reversible , isothermal compression to a final pressure such that the steam becomes just saturated. What is the work required for the process.
The temperature field in a body varies according to the equation \(T(x,y)=x^{3}+4xy\). Find the direction of fastest variation in temperature at the point \((1,0)\).