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SpyIntel [72]
3 years ago
13

Your boat departs from the bank of a river that has a swift current parallel to its banks. If you want to cross this river in th

e shortest amount of time, you should direct your boat If you want to cross this river in the shortest amount of time, you should direct your boat:_________
a. perpendicular to the current.
b. upstream.
c. downstream.
d. so that it drifts with the current.
Physics
1 answer:
REY [17]3 years ago
8 0

Answer:

D.

Explanation:

Given that your boat departs from the bank of a river that has a swift current parallel to its banks. If you want to cross this river in the shortest amount of time, you should direct your boat: so that it drifts with the current.

If the boat moves perpendicular to the current, the current flow will be the resistance to the movement of the boat. So, it's better for the boat to drifts perpendicularly with the current.

The best answer is therefore option D.

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Two coils are wound around the same cylindrical form. When the current in the first coil is decreasing at a rate of -0.245 A/s ,
Airida [17]

Answer:

Complete question:

c.If the current in the second coil increases at a rate of 0.365 A/s , what is the magnitude of the induced emf in the first coil?

a.M= 6.53\times10^{-3} H

b.flux through each turn = Ф = 4.08\times10^{-4} Wb

c.magnitude of the induced emf in the first coil = e= 2.38\times10^{-3} V

Explanation:

a. rate of current changing = \frac{di}{dt}=[tex]M=\frac{1.60\times10^{-3} V}{0.240\frac{A}{s} }}[/tex]

  Induced emf in the coil =e= 1.60\times10^{-3} V

  For mutual inductance in which change in flux in one coil induces emf in the second coil given by the farmula based on farady law

     e=-M\frac{di}{dt}

     M=\frac{e}{\frac{di}{dt} }

     M=\frac{1.60\times10^{-3} }{-0.245}

   M= 6.53\times10^{-3} H

b.

  Flux through each turn=?

  Current in the first coil =1.25 A

   Number of turns = 20

       using   MI = NФ

     flux through each turn = Ф =  \frac{6.53\times10^{-3}\times1.25}{20}

   flux through each turn = Ф = 4.08\times10^{-4} Wb

c.

   second coil increase at a rate = 0.365 A/s

  magnitude of the induced emf in the first coil =?

 using   e=-M\frac{di_{2} }{dt}

            e= 6.53\times10^{-3} \times 0.365

magnitude of the induced emf in the first coil = e= 2.38\times10^{-3} V

4 0
3 years ago
A hiker begins a trip by first walking 25.0 km southeast from her car. She stops and sets up her tent for the night. On the seco
Sunny_sXe [5.5K]

Answer:

(a)

x_1=17.68km\\y_1=-17.68km\\x_2=20km\\y_2=34.64km

(b) r=41.32km

\alpha =24.23^o

Explanation:

Let us take the north direction to be the positive y-axis and the east to be positive x-axis.

First day:

25.0 km southeast, which implies 45^o south of east. The y-component will be negative and the x-component will be positive.

x_1=25cos45^o=17.68km

y_1=-25sin45^o=-17.68km

Second day:

She starts off at the stopping point of last day. This time, both the y- and x-components are positive.

x_2=40cos60^o=20km

y_2=40sin60^o=34.64km

Therefore, total displacements:

x=x_1+x_2=(17.68+20)km=37.68km

y=y_1+y_2=(-17.68+34.64)km=16.96km

Magnitude of displacements,

r=\sqrt{x^2+y^2}=41.32km

Direction,

\alpha =tan^{-1}(\frac{y}{x})=24.23^o

6 0
4 years ago
On the decibel scale,an increase of 1 dB means that sound intensity is increased by a factor of ________?
Maurinko [17]


Your answer would be 10 decibels
4 0
3 years ago
Read 2 more answers
How many justified by Bohr model?
Dominik [7]

X-ray formation

Energy difference in the first ionization of the same group of elements

Differential linear emission spectra of different elements

Explanation:

The formation of x-ray, energy difference in the first ionization of the same group of elements and differential linear emission spectra of different elements can be justified by the Bohr model of the atom.

  • According to Neil Bohr, in an atom, the extranuclear part consists of electrons in specific spherical orbits around the nucleus.
  • Bohr's model explained the discrete lines in atomic spectrum of different elements.
  • Due to excitation of electrons, some rays are given off. Some of these are energetic like x-rays.
  • The energy difference between the first ionization of the same group of elements is a proof that electrons are in specific spherical orbits.
  • The higher the energy the level, the ease at which electrons can be removed and the lower the ionization energy.

Learn more:

Bohr model of the atom brainly.com/question/4986277

#learnwithBrainly

3 0
4 years ago
Having the correct posture and the degree or severity of braking, acceleration and steering inputs have a direct result on the a
kaheart [24]

Answer: Vehicle Balance

Explanation:

Vehicle balance simply means how the weight of a vehicle is distributed across its tires which connects to the road

It should be noted that there'll be a shift in the balance of a vehicle when the braking, acceleration, or turning bring about a scenario in which the weight of th vehicle moves from one area to another.

8 0
3 years ago
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