Download App

STD 11 - 9.1. fluid mechanics — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 9.1. fluid mechanics4 Marks
Question
Water flows steadily through a horizontal pipe of variable cross-section. If the pressure of water is $P$ at a point where flow speed is $v$ , the pressure at another point where the flow speed is $2v$ , is (Take density of water as $\rho $ )
✓

Answer

Applying Bernoullis's Equation at two points$:$

$p_{1}+\frac{\rho v_{1}^{2}}{2}=p_{2}+\frac{\rho v_{2}^{2}}{2}$

Given, $p_{1}=p, \quad v_{1}=v \quad v_{2}=2 v$

$p_{2}=p+\frac{\rho v^{2}}{2}-\frac{4 \rho v^{2}}{2}$

$p_{2}=p-\frac{3 \rho v^{2}}{2}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

NEET STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Let $T_1$ and $T_2$ be the time periods of two springs $A$ and $B$ when a mass $m$ is suspended from them separately. Now both the springs are connected in parallel  and same mass $m$ is suspended with them. Now let $T$ be the time period in this position. Then
→
The plate current in a triode is given by ${I_p} = 0.004\;{({V_p} + 10{V_g})^{3/2}}mA$where $I_p, V_p $ and $V_g$ are the values of plate current, plate voltage and grid voltage, respectively. What are the triode parameters $\mu$, $rp$ and $gm$  for the operating point at ${V_p} = 120\,volt$ and ${V_g} = - \,2\,volt$ ?
→
There is a hole in the bottom of tank having water. If total pressure at bottom is $ 3 atm$  ($1 atm = 10^5N/m^2$) then the velocity of water flowing from hole is
→
Radioactive element decays to form a stable nuclide, then the rate of decay of reactant $\left( {\frac{{dN}}{{dt}}} \right)$ will vary with time $(t) $ as shown in figure
→
The field of view is maximum for
→
A simple pendulum suspended from the ceiling of a stationary lift has period $T_0$. When the lift descends at steady speed, the period is $T_1$, and when it descends with constant downward acceleration, the period is $T_2$. Which one of the following is true?
→
A closely wound coil of $100$ turns and area of cross-section $1\;c{m^2}$ has a coefficient of self-induction $1 \,mH$. The magnetic induction in the centre of the core of the coil when a current of $2A$ flows in it, will be......$Wb{m^{ - 2}}$
→
Four rods of silver, copper, brass and wood are of same shape. They are heated together after wrapping a paper on it, the paper will burn first on
→
There is a $5\Omega $ resistance in an $ac$, circuit. Inductance of $0.1\,H$ is connected with it in series. If equation of $ac$ $e.m.f$. is $5\sin 50t$ then the phase difference between current and $e.m.f$. is
→
If $x = at + b{t^2}$, where $x$ is the distance travelled by the body in kilometres while $t$ is the time in seconds, then the units of $b$ are
→