The hammer of an electric bell strikes 1440 times in a minute and does a work of 0.2 j per strike. what is the power of hammer in s. i.system?

First we need to convert the frequency to the correct SI units (seconds)

Frequency of bell = 1440/60 = 24 Hertz (Strikes per second)

Power is the rate of work being done or the work done per second.

P = E/t = (24 * 0.2)/1 = 4.8 Watt