A heater coil connected to 240-Vrms ac line has a resistance of 31 Ω . Part APart complete What is the average power used? Express your answer to two significant figures and include the appropriate units. P¯¯¯¯ = 1900 W Previous Answers Correct Part B What is the maximum value of the instantaneous power?

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

What will happen in a hybrid vehicle if current flow becomes too high due to a short?