Derive the equation for = (). (Assume that the transistor in active region.) (b) Find the voltage range that keeps the transistor in active region. Assume = 150, cc = 1 , = 30 . (c) Draw the small signal model and find the small signal voltage gain in terms of , cc, and . (d) Find the expressions for input and output resistances.

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.

If anyonee has done the momentum lab practical in physics can you give me the answers i am s lostt rnn : (