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...

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

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...

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,...

A 10 kg box is initially at rest on a rough horizontal surface and a horizontal force is then applied to it. The force varies as shown in...

Given that the mass of the drum is 20 kg. What is the minimum force, F, required to just movee th drum off the ground? (Assume uniform...

A rock is thrown vertically upwards with a velocity of 29.4 m/s from the top of a building 78.4 m high. After how long will the rock...