A professional diver of mass 60 kg performs a dive from a platform 10 m above the water surface. Find the magnitude of the average impact force experienced by him if the impact time is 1s on collision with water surface. Assume that the velocity of the diver just after entering the water surface is $4m{s}^{-1}.(g=10m{s}^{-2})$

A professional diver of mass $60kg$ performs a dive from a platform $10m$ above the water surface. Find the magnitude of the average impact force experienced by him if the impact time is $1s$ on collision with water surface. Assume that the velocity of the diver just after enering the water surface is $4m{s}^{-1}(g=10m{s}^{-2})$ .

A diver makes $2.5$ revolutions on the way from a $10-m-high$ platform to the water. Assuming zero initial vertical velocity, the average angular velocity during the dive is.

There is a hole at the side-bottom of a big water tank. The area of the hole is $4m{m}^2$ to it a pipe is connected. The upper surface of water is 5 m above the hole. The rate of flow of water through the pipe is (in $m^3{s}^{-1})(g=10m{s}^{-2})$

A sound made on the surface of a lake takes 3 s to reach a boatman.
How much time will it take to reach a diver inside the water at the same depth ?
Velocity of sound in air = $330m{s}^{-1}$
Velocity of sound in water = $1450m{s}^{-1}$

An annular disc of radius $r_1=10cm$ and $r_2=5cm$ is placed on a water surface. Find the surface tension force on the disc if we want to pull it from water surface. Take coefficient of surface tension as $\sigma =72dy\ne /cm,g=10m{s}^{-2}$.

A particle of mass $m=1kg$ collides with the end with velocity $v_0=6m{s}^{-1}$ of a spinning rod of $mass2m$ and length $l=1m$ at the end of the rod. If the coefficient of restitution of collision $e=(2/3),$ find the
a. velocity of the particle
b. angular velocity of the rod just after the impact.

Two particles of mass 2kg and 6kg are moving on smooth horizontal surface collides with each other.If velocity of their common centre of mass is 10m/s before collision then what will be the total linear momentum of system of particles after collision.(Assume they move along the surface after collision)

A ball of mass 1 kg falls from a height of 5 m above the free surface of water. The relative density of the solid ball is $s=\frac{2}{3}$. The ball travels a distance of 2 m under water and becomes stationary. The work done by the resistive forces of water is $(-10n)J$. Find value of n.

A ball of mass 1 kg falls from a height of 5 m above the free surface of water. The relative density of the solid ball is $s=\frac{2}{3}$. The ball travels a distance of 2 m under water and becomes stationary. The work done by the resistive forces of water is $(-10n)J$. Find value of n.

A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 8.90 m/s and her body makes an angle of ${75.0}^{\circ }$ with respect to the horizontal surface of the water. Determine her initial velocity, both magnitude and direction.