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- Time interval between two sounds from a gun – direct and reflected sound
Solutions: Option B You can view the video tutorial here or the written solutions below.
- Boy on spring board - Moments Question using Simultaneous Equations
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 of the plank from point A? Solutions: a) 300 N and b) 6.67 m Click on the video tutorial if you can’t derive the 2 equations.
- Sound – Pitch and Loudness
Pitch of the sound depends on the frequency [Higher frequency -> Higher pitch] Loudness of the sound depends on the amplitude [Higher amplitude (energy) ->Louder sound]
- Short circuit
When there is an alternative low resistance path for the current to flow through, the current will by pass the other path that has a resistance load (e.g. resistor or bulbs). This is called a 'short circuit' and usually the current will be higher.
