As shown in the figure, for a biconvex lens the focal length is \( f \) and both radii of curvature are \( R \). Find the value of \( f/R \) (\( \mu = 1.4 \)):
The figure shows a pipe with cross-section area 10 \( cm^2 \). Water flows from one end with velocity 20 cm/s. The other end of the pipe is closed and consists of 10 holes each of area 30 \( mm^2 \). Find the velocity of water coming out from each hole:
Which of the following best represents the temperature versus heat supplied graph for water, in the range of \(-20^\circ\text{C}\) to \(120^\circ\text{C}\)?