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grandymaker [24]
3 years ago
14

Laminar flow, where water moves in approximately straight-line paths, characterizes ________.

Physics
1 answer:
densk [106]3 years ago
6 0

Answer:

b. slow-moving streams.

Explanation:

In Fluid Mechanics, the Reynolds numbers indicates the existence of turbulence in fluid streams. Low Reynolds numbers are related with laminar flow. The Reynolds formula is:

Re = \frac{\rho_{water} \cdot L_{c}}{\mu_{water}} \cdot v

The Reynolds number is directly proportional to fluid speed. Hence, slow-moving streams are a sound example of laminar flow. The correct answer is B.

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A girl is floating in a freshwater lake with her head just above the water. If she weighs 610 N, what is the volume of the subme
Elden [556K]

Answer:

The volume of the submerged part of her body is 0.0622m^{3}

Explanation:

Let's define the buoyant force acting on a submerged object.

In a submerged object acts a buoyant force which can be calculated as :

B=ρ.V.g

Where ''B'' is the buoyant force

Where ''ρ'' is the density of the fluid

Where ''V'' is the submerged volume of the object

Where ''g'' is the acceleration due to gravity

Because the girl is floating we can state that the weight of the girl is equal to the buoyant force.

We can write :

W_{girl}=B (I)

Where ''W'' is weight

⇒ If we consider ρ = 1000\frac{kg}{m^{3}} (water density) and g=9.81\frac{m}{s^{2}} and replacing this values in the equation (I) ⇒

B=W_{girl}

B=610N

ρ.V.g = 610N

1000\frac{kg}{m^{3}}.V.(9.81\frac{m}{s^{2}})=610N (II)

The force unit ''N'' (Newton) is defined as

N=kg.\frac{m}{s^{2}}

Using this in the equation (II) :

(9810\frac{N}{m^{3}}).V =610N

V=\frac{610N}{9810\frac{N}{m^{3}}}

V=0.0622m^{3}

We find that the volume of the submerged part of her body is 0.0622m^{3}

8 0
3 years ago
Will the rocket go up or will it stay on the ground ? Explain the answer if you can also please and thank you.
Goryan [66]

Answer:

the rocket will go up

Explanation:

there is less force pulling down on the rocket.

100N > 75N

5 0
3 years ago
A nuclear fission power plant has an actual efficiency of 32%. If 0.18 MW of power are produced by the nuclear fission, how much
7nadin3 [17]

Answer:

 P₀ = 5.76 x 10⁻² MW

Explanation:

given,

efficiency of the power plant = 32%

Power produced by the nuclear fission = 0.18 MW

the power plant output = ?

using formula of efficiency

\eta = \dfrac{P_0}{P}

where P is the power produced in the power plant

          P₀ is the power output of the power plant

\eta = \dfrac{P_0}{P}

0.32 = \dfrac{P_0}{0.18}

 P₀ = 0.18 x 0.32

 P₀ =  0.0576 MW

 P₀ = 5.76 x 10⁻² MW

Power plant output is equal to  P₀ = 5.76 x 10⁻² MW

8 0
3 years ago
A Student walks 2 km in 30 minutes
KengaRu [80]

Answer:

1 km / 15min

Explanation:

The average speed is calculated by simply doing space divided by time so:

2km / 30min that becomes 1km / 15min

Have a good day.

3 0
2 years ago
A 0.500-kg potato is fired at an angle of 80.0° above the horizontal from a PVC pipe used as a "potato gun" and reaches a height
lions [1.4K]

Answer:

(a) 47.15ms^{-1}

(b) 2470.13ms^{-2}

(c) 1235.06N and 252.05 as a ratio

Explanation:

From Newton's second law of motion

F=ma where m is mass, a is acceleration and F is net force

Also from kinetic equation of motion, velocity and displacement are related using equation

v^{2}=u^{2}+2sa

Where v is final velocity, u is initial velocity, a is acceleration and s is displacement

From the free body diagram attached, final velocity at maximum height is 0 and initial velocity is usin80^{o}

Also, the vertical component can be written as

v_{y}^{2} }=u_{y}^{2} } -2gs The negative sign before 2gs means displacement is opposite the gravitational force

Where g is acceleration due to gravity,u_{y} is vertical component of initial velocity and v_{y} is vertical component of final velocity

Since v_{y} is 0

u_{y}^{2} } =2gs

s=110 and g is taken as 9.8

u_{y}=\sqrt{2*9.8*110}=46.43275

u_{y}=46.43ms^{-1}

Also, it's evident that the vertical component of initial velocity is u_{y}=u_{i}sin \theta where \theta is angle of projection and u_{i} is resultant velocity

Making u_{i} the subject we obtain u_{i}=\frac {u_{y}}{sin \theta}

Since u_{y} and \theta are known as 46.43ms^{-1} and 80^{o} respectively, then u_{i}=\frac {46.43ms^{-1}}{sin 80^{o}}=47.15ms^{-1}

Therefore, the velocity of potato is 47.15ms^{-1}

(b)

Displacement depends on length of tube hence s=0.450m hence going back to kinetic equation v^{2}=u^{2}+2sa

The final velocity v is answer in part a which is 47.15ms^{-1}, initial velocity u is 0ms^{-1} hence the equation is re-written as

v^{2}=2sa and making a the subject we obtain

a=\frac {v^{2}}{2s}

a=\frac {47.15^{2}}{2*0.450}=2470.13ms^{-2}

Therefore, average acceleration is 2470.13ms^{-2}

(c)

From Newton's second law of motion, F=ma where m=0.500kg and a is 2470.13ms^{-2}

Therefore, the average force of potato is

F=0.5*2470.13=1235.06N

F=1235.06N

The weight, W of potato is given by W=mg

Taking R as ratio of average force and weight of potato

R=\frac {F}{W}=\frac {F}{mg} and since F=1235.06, m=0.500kg and g=9.8

R=\frac {1235.06}{0.500*9.8}=252.05

Therefore, ratio of average force to weight is 252.05

8 0
3 years ago
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