Air with a mass flow rate of 2.3 kg/s enters a horizontal nozzle operating at a steady-state at 450 K, 350 kPa, and a velocity of 3 m/s. At the exit, the temperature is 300 K and the velocity is 460 m/s. Using the ideal gas model for air with constant cp = 1.011 kJ/kg*K, determine
a. the area at the inlet, in m^2
b. the heat transfer between the nozzle at its surroundings in kW.
c. Specify whether the heat transfer is to or from the air.

Suppose you have a box. which of these is not necessarily a true statement regarding the relationship between the force applied to the box, the work done on the box, and the distance the box is moved? a. if the box is not moved, no force is being applied to the box. b. if no force is applied to the box, no work is done on the box. c. if work is done on the box, then a force is applied to the box. d. if work is done on the box, then the box is moved a distance.

Debris produced by mining is called

The ability to make things happen is also called a. heat b. force c. matter d. energy