Determine the Fourier series coefficient and sketch the magnitude spectrum of the following periodic signal: nánc -0.10 0.1 0.3 -0.5 -0.3 0.5 0.7

Number 2 A piece of beef steak 7 cm thick will be frozen in the freezer room -30°C. This product has a moisture content of 73%, a density of 970 kg/m³, and a thermal conductivity (frozen) of 1.1 W/(m²K). Estimate the freezing time. using the Plank equation. This product has an initial freezing temperature of -1.75°C, and the movement of air in the freezing room gives a convective heat transfer coefficient of 15 W/(m²K). t f = answer in hour

H:10) Connect a battery to a solenoidA cylindrical solenoid 40 cm long with a radius of 2 mm has 300 tightly-wound turns of wire uniformly distributed along its length (see the figure). Around the middle of the solenoid is a two-turn rectangular loop 3 cm by 2 cm made of resistive wire having a resistance of 195 ohms. One microsecond after connecting the loose wire to the battery to form a series circuit with the battery and a 20 resistor, what is the magnitude of the current in the rectangular loop and its direction (clockwise or counter-clockwise in the diagram)? (The battery has an emf of 9 V.)        ................A clockwise counter clockwise