To get the maximum flight, a ball must be thrown as

Water flows through the tube shown. Area of cross-section of wide and narrow part are $5$ $cm^2$ $\&$ $2$ $cm^2$. The rate of flow is $500$ $cm^3/sec$. Find difference in mercury level of $U-$ tube .......... $cm$

Explain blood flow and heart attack with the help of Bernoulli’s principle.

Why does a flag (or ensign) flutter when there is strong wind ? Explain.

In the following fig. is shown the flow of liquid through a horizontal pipe. Three tubes $A, B$  and $ C$  are connected to the pipe. The radii of the tubes $A, B $ and $C$  at the junction are respectively $ 2 cm, 1 cm$   and $2 cm.$  It can be said that the

Alaminar stream is flowing vertically down from a tap of cross-section area $1$ $cm^2$. At a distance $10 $ $cm$ below the tap, the cross-section area of the stream has reduced to $1/2$ $cm^2$. The volumetric flow rate of water from the tap must be about ........ $litre/\min$