Bricks are 20cm long and 10cm high. How high could an arch be built
without mortar on a flat horizontal surface, to overhang by 1
metre? How big an overhang is it possible to make like this?
Explain why, when moving heavy objects on rollers, the object moves
twice as fast as the rollers. Try a similar experiment yourself.
Given the graph of a supply network and the maximum capacity for
flow in each section find the maximum flow across the network.
A battery is modelled as a 24V EMF in series with an internal resistance of $2\Omega$. The battery is being charged by a constant current source as shown in the network below. The ammeter, used to measure the current through the battery, has a voltage drop of 2V at full range scales. Here it is set to a 20A range and reads a current of 2A.
What is the value of the constant current supplied?
What fraction of the input power is supplied to the battery?
What current would flow into the battery if we now replaced the ammeter with a wire of zero impedance?