Drawing ray diagrams for converging lens come in many forms. But the basic concepts needed are the 3 rays (which have rules to follow) to...

Solutions: As the fuel level drops, the float which stays on the fuel surface will descend. The rod which is attached to the float will...

Instead of P = IV to explain, it might be easier to explain using P = I^2R when the components are connected in series where current I is...

When two components are connected in series, where one is a fixed resistor and the resistance of the other can vary (e.g. thermistor,...

Instead of the usual finding of potential difference across a component, in this question, you are required to find the p.d. across two...

To do similar questions, it is important to know the 3 rays which have rules to follow in order to locate the image. Look through the...

Resistors may be connected in series or parallel. When asked which resistor has higher power (hence higher energy), in general we will...

Resistors may be connected in series or parallel. When asked which resistor has higher power (hence higher energy), in general we will...

Solutions: a) Refraction     b) 48.6o     c) c = 41.8o     e) 70o d) Total internal reflection has occured, as the angle of incidence is...

Solutions: (a) (i) A bigger force than F can be obtained due to the lever system and hydraulic system . Lever system: Applying...

Other examples in our daily lives: In some supermarket, the seafood are placed outside of air-conditioned place. The seafood is kept cold...

As both the fixed resistor and the thermistor are connected in series, the sum of potential difference across them will be equal to the...

When temperature is constant (for o-level), when a fixed mass of gas (fixed number of air molecules) is compressed in a closed system...

Solutions: a) 38.8o      b) 41.8o c) 51.2o . The ray does not emerge as total internal reflection has occurred. The angle of incidence is...

In this this question, the displacement-time graphs are given, which are different from displacement-distance graphs. In the...

At sea-level, the barometer which Pie is holding reads 760 mm of Hg. When he is at the top of Mount Pie, the same barometer reads 230 mm...

Note: Non-uniform plank means the CG of the plank is not at its centre a) Find the weight of the boy. b) How far is the centre of gravity...

The speed-time graph of Car A and Car B, along a straight road over 4 seconds is shown below. a) Calculate the acceleration of Car A and...

Sensitivity of the ammeter means that how small a current the ammeter can measure. Example, if the original set up is 0.2 A per division,...