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Ulleksa [173]
3 years ago
10

In the rainy season, the Amazon flows fast and runs deep. In one location, the river is 22 m deep and moves at a speed of 4.4 m/

s toward the east. The earth's 50 μT magnetic field is parallel to the ground and directed northward. If the bottom of the river is at 0V, what is the potential (magnitude and sign) at the surface?
Physics
2 answers:
andreev551 [17]3 years ago
8 0

Given Information:  

depth = L = 22 m

Speed = v = 4.4 m/s

Magnetic field = B = 50 μT

Required Information:  

Potential difference = E = ?

Answer:

Potential difference = 4.84 mV

Explanation:

The potential difference can be found using

E = BvL

Where v is the speed of flowing river, B is the magnetic field and  L is the depth of river .

E = 50x10⁻⁶*4.4*22

E = 0.00484 V

or

E = 4.84 mV

The direction of current can found using right hand rule, thumb upward indicating force, forefinger indicating magnetic field and curled fingers indicating current.

Since the potential at bottom of the river is 0V then the potential at top of the surface would be +4.84 mV.

Anna35 [415]3 years ago
5 0

Answer:

V = 4.84×10-³V

Explanation:

V = E×d

E = Bv

Given

B = 50μT = 50×10-⁶T = magnetic field

v = 4.4m/s = speed

E = Bv = 50×10-⁶×4.4 = Electric field strength

E = 2.2×10-⁴ V/m

d = 22m = distance or separation

V = Ed =2.2×10-⁴ × 22

V = 4.84×10-³V = potential

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Answer:

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B) how long does it take to be lifted out at maximum acceleration if it started from rest

Explanation:

A)

let +y is upward. look below at the free body diagram. the mass M refers to the combined mass of the boulder and chain.

the weight of the chain is:   w_{c} =m_{c} g   and maximum tension is T=2.50 m_{c} g=1.41*10^4N

total mass and weight is :

M =m_{c}+ m_{b} =740kg+550kg=1290 kg

w_{M} =1.2650*10^4N

∑F_{y} =ma_{y}

T-M_{g} =Ma_{y}

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=0.645m/s^2

B)

maximum acceleration

a_{y} =0.645m/s^2\\\\y-y_{0} =119m\\v_{0y} =0

using y-y_{0} =v_{oy} t+1/2(a_{y} )t^2

to solve for t

t=\sqrt{2(y-y_{0} )/a_{y} }

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6 0
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A small airplane takes on 302 l of fuel. If the density of the fuel is 0.821 g/ml, what mass of fuel has the airplane taken on?
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Substituting these values in above relation, we get  

m = 302 \times 10^{3} \ mL \times 0.821 g/mL = 247942 g \\\\ m = 247. 94 \ kg

Thus, the mass of the fuel 247 .94 kg.

8 0
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What is the direction of the force on a positive charge when passing through a magnetic field as indicated in this diagram? Expl
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Answer:

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Explanation:

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3 0
3 years ago
A-10A twin-jet close-support airplane is approximately rectangular with a wingspan (the length perpendicular to the flow directi
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Solution :

Given :

Rectangular wingspan

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Chord, c = 3 m

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Given that the flow is laminar.

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So boundary layer thickness,

$\delta_{L} = \frac{5.2 L}{\sqrt{Re_L}}$

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The dynamic pressure, $q_{\infty} =\frac{1}{2} \rho V^2_{\infty}$

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The skin friction drag co-efficient is given by

$C_f = \frac{1.328}{\sqrt{Re_L}}$

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     = 0.00021

$D_{skinfriction} = \frac{1}{2} \rho V^2_{\infty}S C_f$

                  $=\frac{1}{2} \times 1.225 \times 200^2 \times 17.5 \times 3 \times 0.00021$

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2 years ago
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