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3 years ago

Without being able to look into the earth , a scientist would not be able to determine if this region has karst topography

Physics

2 answers:

kari74 [83]3 years ago

8 0

<h2>Without being able to look into the Earth, a scientist would not be able to determine if this region has karst topography, is a false statement</h2>

Explanation:

Karst topography can be observed by looking into the earth’s external surface structures like barren rocky grounds, caves, underground rivers, sinkholes and other karst landscapes.
Karst topography results due to erosion of limestone by the excavation of underground water. When rainwater erodes the soft rocks like limestone it begins to slowly dissolve in water.
Over repeated erosion, only the rocky cliffs remain on the surface. When an underground river emerges from sinkholes in a karst landscape, the rocky remains form caves.
So by studying these external surfaces itself, the scientist can determine if a region has karst topography

padilas [110]3 years ago

6 0

Answer: False

Explanation: They can see it by karst topography!

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3 years ago

Water at 20 C flows through a 5-cm-diameter pipe that has a 180 vertical bend, as in Fig. P3.43. The total length of pipe betwee

Nataliya [291]

Answer:

F = 749 [N]

Explanation:

We must give full information on this problem, as well as the question that needs to be resolved.

Water at 20°C flows through a 5-cm-diameter pipe that has a 180° vertical bend. The total length of pipe between flanges 1 and 2 is 75 cm. When the weight flow rate is 230 N/s,

P1=165kPa

and

P2=134kPa

Neglecting pipe weight, determine the total force that the flanges must withstand for this flow.

We must make a U-shaped body diagram of the pipe in order to visualize the forces acting according to the pressures and the area of the pipe.

Then by means of the second law of motion of Newton, which says that the sum of the forces must be equal to the product of mass times acceleration, we can find the force Fp

Let us remember that pressure is defined as the divided force over the area, therefore:

F = P *A

where:

P = pressure

A = area

The product of the mass by acceleration, is equal to the product of the speed of the fluid by the mass flow, since we know the weight of the fluid we can find its mass flow.

$W_{flow}=230[N/s]\\W_{flow} =g*m_{flow}\\m_{flow} = W_{flow} / g\\m_{flow} = 230/9.81\\m_{flow}= 23.45[kg/s]$

In the function of the mass flow, we can find the velocity of the fluid, as we also know the diameter of the pipe

$m_{flow} = density*v*A\\where\\density = 1000[kg/m^{3}]\\ v= velocity[m/s]\\A = area [m^{2}]\\v=\frac{m_{flow}}{density*A} \\v=\frac{23.45}{1000*\frac{\pi}{4}*(5*10^{-2})^{2} } \\v= 11.94 [m/s]$

We know that the atmospheric pressure is equal to:

$P_{atm} = 101.325[kpa]$

The value of the pipe area is calculated for a circular section

$A = \frac{\pi}{4} * (0.05)^{2}\\ A = 0.00196[m^{2} ]$

The resultant force is 749 [N]

The solution of the equations and the free body diagram can be seen in the attached picture.

3 0

3 years ago

weeeeeb [17]

Answer:

v = 36.667 m/s

Explanation:

Knowing the rotational inertia as

Lₙ = 550 kg * m²

r = 1.0 m

m = 30.0 kg

To determine the minimum speed v must have when she grabs the bottom

Lₙ = I * ω

I = ¹/₂ * m * r²

I = ¹/₂ * 30.0 kg * 1.0² m

I = 15 kg * m²

Lₙ = I * ω ⇒ ω = Lₙ / I

ω = [ 550 kg * m² /s ] / ( 15 kg * m² )

ω = 36.667 rad /s

v = ω * r

v = 36.667 m/s

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4 years ago

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katovenus [111]

Answer:

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3 years ago

5. Aunt Jane weighs 145 pounds. What is her weight in Newtons?

Alex_Xolod [135]

Answer:

i think its 644

Explanation:

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3 years ago