Astirrer of shaft power 500w is used to stir 100 kg of water that is being heated. the heater output power is 3.5 kw and heat losses are 800w. the initial temperature of the water is 20°c. determine: (a) how long it will take before the water reaches a temperature of 80°c, (b) the internal energy change of the water. neglect the specific heat capacity of the vessel itself and take the specific heat capacity of water to be 4.19 kj/kgk.

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

Fluids at rest possess no flow energy. a)- true b)- false

Asingle-geared blanking press has a stroke of 200 mm and a rated capacity of 320 kn. a cam driven ram is assumed to be capable of delivering the full press load at constant force during the last 15 percent of a constant-velocity stroke. the camshaft has an average speed of 90 rev/min and is geared to the flywheel shaft at a 6: 1 ratio. the total work done is to include an allowance of 16 percent for friction a) estimate the maximum energy fluctuation b) find the rim weight for an effective diameter of 1.2 m and a coefficient of speed fluctuation of 0.10