Explain what is meant by this statement : The mains supply in the UK has a frequency of 50 Hz. Please answer with explanation.
Will give the brainliest

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.

An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 104 v before it hits the target. what is the kinetic energy of the electron in electron volts?