Physics Past Questions and Answers

Which of the following is not an example of a machine?

How long will it take to heat \(3 kg\) of L1't from \(28^{"} C\) in an electnc kettle taking 6Atfem 2 220V supply? (specitic heat capacity ofwater is \(4180 J / k\) )

A cell with an emf of \(1.5 V\) and an internal resistance of \(10 .\). fohims 1 connegted to two resistances of \(2.0\) and \(3.0\) ohms in series. The current produced by this cell is

Which of the following is not essential for the productipn of elèctron by thermionic emission?

If an object moves with a constant speed round a circlf, it has an acceleration which is