Oil enters the bend of a pipe in the horizontal plane with velocity `4ms^(-1)` and pressure `280xx10^(3)Nm^(-2)` as shown in the figure. Find the pressure of oil at the point `Q` in `(kNm^(2))`
(Take specific gravity of oil as 0.9 and `sin37^@=0.6.`)

The volume of a gas at pressure 1.2 xx 10^(7) Nm^(-2) and temperature 127^(@)C is 2.0 litre. Find the number of molecules in the gas.

water enters at one end of a horizontal pipe of non-unifrom cross -section with a velocity of 0.4 ms^(-1) and leaves the other end with a velocity of 0.6 ms^(-1) The pressure of water at the first end is 1500Nm^(-2) Calculate the pressure at the other end Density of water =1000kgm^(-3)

Two point charge q_(1) = -10xx10^(-6) C " and "q_(2)=15xx10^(-6) are 40 cm apart as shown in figure. Find the potential difference between the point P and Q.

At a point P in a water pipe line the velocity is 1ms^(-1) and the pressure is 3xx10^(5)pa . At another point Q the area of cross section is half that of at P and the pressure is 5xx10^(5 pa. The difference of heights between P and Q in metre is (g=10ms^(-2))

A cube of ice floats partly in water and partly in K.oil figure. Find the ratio of the volume of ice immersed in water to that in K.oil. Specific gravity of K.oil is 0.8 nd that of ice is 0.9.

The reading of pressure meter attached with a closed pipe is 3.5 xx 10^(5)Nm^(-2) . On opening the value of the pipe, the reading of the pressure meter is reduced to 3.0 xx 10^(5) Nm^(-2) . Calculate the speed of the water flowing in the pipe.