1. consider the following equivalent circuit model of a bipolar transistor at a certain bias point (vbe, vbc) in the forward-active regime. a) calculate ic at which the device is biased. b) calculate the current gain, βf, of the transistor. c) calculate the short-circuit current-gain cut-off frequency, ft, of this device at this bias point. d) calculate the early voltage, va, of the transistor. e) derive values for all small-signal elements of the equivalent circuit model of another transistor fabricated side-by-side to the one above but with an emitter stripe length that is twice as long. the device is biased at the same voltages (vbe, vbc) as the above device

A1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. what is the total momentum before and after the collision?

(science)study the following ocean currents map. an ocean currents map is shown. on the map the locations for san diego, california and savannah, georgia are marked. there is a looping current from the north past san diego and a looping current from the south near savannah which statement is most likely correct about the average temperatures in san diego, california as compared to savannah, georgia? it is higher in savannah because of the cool ocean currents from the south. it is higher in savannah because of the warm ocean currents from the north. it is lower in san diego because of the warm ocean currents from the south. it is lower in san diego because of the cool ocean currents from the north.

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?