An insulated, electrically heated tank for hot water contains 190 kg of liquid water at 60°C when a power outage occurs. If water is withdrawn from the tank at a steady rate of =0.2 kg s-, how long will it take for the temperature of the water in the tank to drop from 60 to 35°C? Assume cold water enters the tank at 10 C, and negligible heat losses from the tank. For liquid water let Cy = Cp C, independent of T and P. %3D

Q3: A universal fractional horsepower series motor has a resistance of 30 22 and a total inductance of 0.5 H. When connected to a 250 V d.c. supply and loaded to take 0.8 A, it runs at 2000 r.p.m. Estimate the speed and p.f. when connected to a 250 V a.c. supply and loaded to the same current.

The diagram representa a primary coil P, carrying a steady current, and a secondary coil S,which is connected to a galvanometer G, The following steps are performed one after another: I. P is pushed rapidly into S II. P is held stationary inside S II, P is withdrawn rapidly from S IV, P is held stationary outside of S During which of these steps does G show a steady zero read Select one: a. II and III only b. II and IV only

In this Exercise 6 we will explore laws critical to the study of electromagnetism. We will be using Simulation 3 (below) to explore how a moving magnet produces current in a nearby coil of wire.   a. Magnetic field strength decreases as you get farther from the poles of the magnet. Does the flux through the face of the coil change as you move the magnet? Explain your answer. b. Why does the meter needle deflect? Is the deflection in accordance with Lenz’s Law? Justify your answer in terms of Lenz’s law and your above answers.