Aone-dimensional plane wall of thickness 2l= 100 mm experiences uniform thermal energy generation of q˙= 1600 w/m3 and is convectively cooled at x= ±50 mm by an ambient fluid characterized by [infinity] t[infinity]= 20°c. if the steady-state temperature distribution within the wall is t(x)=a(l2-x2)+b where a= 10°c/m2 and b= 30°c, what is the thermal conductivity of the wall? what is the value of the convection heat transfer coefficient, h ?

15. give an example for some particles or waves that are moving faster than light in everyday life 16. what is a laser? 17. what is an oscilloscope? 18. what does it means practically that nothing is faster than light in vacuum? 19. what is vacuum?

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?