In preparation for an electrophoresis procedure, enzymes are added to DNA in order to

Water flows steadily through a fire hose and nozzle. The hose is 78 mm inside diameter, and the nozzle tip is 20 mm I.D.; water

IgorC [24]

Answer:

The reaction force is 2.776kN as the force is negative and on the left of the Control Volume this indicates that the coupling in in tension.

Explanation:

By applying the continuity equation as

$A_1V_1=A_2V_2\\$

By simplifying the equation

$V_1=V_2(\frac{D_2}{D_1})^2$

Here

V_2=43 m/2

D1=78 mm

D2=20 mm

So the velocity is given as

$V_1=V_2(\frac{D_2}{D_1})^2\\V_1=2.827 m/s$

Now by applying the equation of momentum in x direction

$R_x=-P_{1g}A_1+\rho V_1^2A_1-\rho V_2^2A_2$

Here

P1g is given as 427 kPa

A1 is given by $\pi D_1^2/4=\pi (78/1000)^2/4=0.00477 m^2$

ρ is the density of water given as 1000 kg/m3
V1 is calculated above as 2.827 m/s
V2 is given as 42 m/s

A2 is given by $\pi D_2^2/4=\pi (20/1000)^2/4=0.00031 m^2$

Substituting the values in the equation gives

$R_x=-P_{1g}A_1+\rho V_1^2A_1-\rho V_2^2A_2\\R_x=-(470 \times 10^3)(0.00477)+(1000) (2.827)^2(0.00477)-(1000) (43)^2(0.00031)\\R_x=-2776.96 N$

So the reaction force is 2.776kN as the force is negative and on the left of the Control Volume this indicates that the coupling in in tension.

5 0

3 years ago

Which is a mixture?

Orlov [11]

Answer:

gas

Explanation:

6 0

3 years ago

A 26.3 kg object is traveling at 21.0 m/s north. What average net force is required to bring this object to a stop in 2.60 secon

taurus [48]

The average force is -212.4 N

Explanation:

We can solve this problem by using the impulse theorem, which states that the impulse exerted on the object (the product of the force exerted and the time) is equal to the change in momentum of the object:

$F \Delta t = m \Delta v$

where

F is the net force on the object

$\Delta t$ is the time

m is the mass

$\Delta v$ is the change in velocity

In this problem, we have:

m = 26.3 kg

$\Delta v = -21.0 m/s$

$\Delta t = 2.60 s$

Solving for F, we find

$F=\frac{m\Delta v}{\Delta t}=\frac{(26.3)(-21.0)}{2.60}=-212.4 N$

where the negative sign indicates that the direction of the force is opposite to the motion of the object.

Learn more about force and momentum:

brainly.com/question/9484203

#LearnwithBrainly

4 0

3 years ago

An insulator can do which of the following? Conduct charge through it. Become positively or negatively charged. Transfer protons

ser-zykov [4K]

The correct answer is:
<span>Become positively or negatively charged

In fact, an insulator is a material where charges cannot move freely. Therefore, it can be positively or negatively charge (for example, if it is rubbed against another object, the insulator can remain with an excess of charge), but it cannot transfer charge to other objects.</span>

5 0

3 years ago

Carla holds a ball 1.5 m above the ground. Daniel, leaning out of a car window, also holds a ball 1.5 m above the ground. Daniel

spayn [35]

Answer:

Carla

Explination: As Daniel's ball is dropped from the car moving at 40 mph in a horizontal direction, at the time the ball is dropped it is also moving at 40 mph in a horizontal direction due to inertia, a property of mass causing resistance to change, Daniel's ball will continue to move in a horizontal direction even after being dropped along with falling due to gravity. Daniel's ball will then fall in a projectile motion curve of sorts which will cause an overall velocity to not be straight down causing it not to fall to the ground as quickly as Carla's ball.

Sorry for the long explanation

8 0

3 years ago

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