Ask your teacher the magnetic flux through a metal ring varies with time t according to φb = at3 − bt2, where φb is in webers, a = 6.00 wb s−3, b = 18.0 wb s−2, and t is in seconds. the resistance of the ring is 2.50 ω. for the interval from t = 0 to t = 2.00 s, determine the maximum current induced in the ring.

The material that keeps its new shape after it is stretched is called?

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.