In the hydraulic press, the force F applied is related to the diameter d of the cylinder by 
 

 In an electric circuit, an inductor of inductance 0.5 H and resistance 50\(\Omega\) is connected to an alternating current source of frequency 60 Hz. Calculate the impedance of the circuit.

Which of the following statements correctly explains why a total solar eclipse would be seen by people on only a small portion of the earth's surface? The
 

 Water waves have a wavelength of 3.6cm and speed of 18cms\(^{-1 }\) in deep water. If the waves enter shallow water with wavelength of 2.0cm, calculate the speed of the waves in the shallow water.

An a.c. generator can be converted to a d.c. electric motor by replacing the