Gic as part of tunable band-pass filter. given: r1 = 1.0 kω; r2 = 1.0 kω; r3 = 1.0 kω; r4 = 1.0 mω; r5 = 1.0 kω; r6 = 10 kω; c1 = 1000 μf; c2 = 1 μf; vcc = ± 12 volt; oa1, oa2 – 741 •present 2 equivalent rcl circuits (for r6 = 0ω and r6 = 10kω). •find a resonant frequencies f0min and f0max (for r6 = 0ω and r6 = 10kω). •find value of q for both frequencies. •simulate the circuit in the frequency’s range f between 1 and 3,000 hz. use vin=100 mv (rms); •present result in form of vout / vin = f(f) for 2 simulations (for r6 = 0ω and r6 = 10kω) on the same logarithmic graph

Athin, square metal plate measures 14 cm on each side and has emissivity of 0.60. the plate is heated to a temperature of 745°c. what is the rate at which the plate radiates energy ? the stefan-boltzmann constant is 5.67 × 10-8 w/(m2 ? k4). remember that the plate will radiate energy from both its top and bottom surfaces.

Comedians like to joke that the reason we haven’t been visited by intelligent life from elsewhere in the universe is that aliens have been monitoring earth’s broadcasts of intellectually embarrassing tv programs, like gilligan’s island, fear factor, the jersey shore, and the jerry springer showand so consider us far too primitive to merit a visit. let’s check the assertion that aliens could have been receiving them. tv programs are broadcast at a frequency of about 100mhz with about 100kw of total power in 30frames per second, which emanatesroughly uniformly in all directions. assume that interstellar space transmits these broadcasts without attenuation. no matter how smart they are, aliens would require at least one photon per frame to interpret our signals. findthe number of photons per unit time per unit area reaching a receiver on a possible planet in the nearest star system, which is about 4 light-years away (a light-year is the distance light travels in a year). if aliens aimed a receiver or detector directly at earth, how big (in diameter) would it have to be to receive a photon per frame

Wo small variable-thrust jets are actuated to keep the spacecraft angular velocity about the z-axis constant at ? 0 = 1.16 rad/s as the two telescoping booms are extended from r1 = 1.18 m to r2 = 4.69 m at a constant rate over a period of 124 seconds. the small 19-kg experiment modules at the ends of the booms may be treated as particles, and the mass of the rigid booms is negligible. determine the necessary thrust t for each jet as a function of time where t = 0 is the time when the telescoping action is begun. after you have the general expression for t, answer the questions. show work.