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3 years ago

15

Consider the circuit. find the equivalent resistance

1 answer:

Gwar [14]3 years ago

3 0

Answer: 18 5.0 012

Explanation:

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A resistor is made out of a long wire having a length L. Each end of the wire is attached to a termina of a battery providing a

Len [333]

Answer:

B) 2I

Explanation:

The equation that relates voltage, current and resistance is V=RI.

The equation for the resistance of a material in terms of its resistivity, length and cross-sectional area is $R=\frac{\rho L}{A}$

In this case, the length is divided by 2 while keeping its resistivity (since it's the same material) and area, which means the resistance gets divided by 2. Then, looking at the equation I=V/R and keeping V constant, one deduces that since the resistance now is half than before then current now must be twice as before.

This is all intuitive in fact, cuting a homogeneous resistor in half and leaving the rest of the variables constant makes twice as easy for the electrons to cross the conductor, thus twice the current (one has to know that all the variables involved behave linearly, as the equations show).

8 0

3 years ago

A particle oscillates harmonically x = A cos(ωt + φ0), with amplitude 9 m, angular frequency π s −1, and initial phase π 3 radia

Gekata [30.6K]

Answer:

$t = \frac{5}{12} s$

Explanation:

As we know that the equation of particle position is given as

$x = A cos(\omega t + \phi_0)$

Now the speed of the particle is given as

$v = A\omega sin(\omega t + \phi_0)$

now we know that potential energy and kinetic energy is equal

so we have

$\frac{1}{2} mv^2 = \frac{1}{2}kx^2$

so we will have

$A^2\omega^2 sin^2(\omega t + \phi_0) = A^2\omega^2 cos^2(\omega t + \phi_0)$

$tan^2(\omega t + \phi_0) = 1$

$\omega t + \phi_0 = \frac{\pi}{4} or \frac{3\pi}{4}$

$\pi t = \frac{3\pi}{4} - \frac{\pi}{3}$

$\pi t = \frac{5\pi}{12}$

$t = \frac{5}{12} s$

6 0

3 years ago

K value in base units for coloumbs law

Crazy boy [7]

Answer:

The constant k has the value. k = 8.99 × 10 9 N ⋅ m 2 /C 2.

5 0

2 years ago

A ray of light strikes a mirror. The angle formed between the incident ray and the reflected ray measures 64 º. What are the mea

julia-pushkina [17]

Answer:

Draw line perpendicular to mirror

Angle of incidence = angle between incident ray and perpendicular

Angle of reflection = angle between reflected ray and perpendicular

32 + 32 = 64

Angle of incidence = angle of reflection = 32 deg

6 0

2 years ago

A submarine is carefully navigating its way to the seafloor. It sends out “pings”—a radar wave—as it descends to keep track of i

Murljashka [212]

Answer:

D. impossible to estimate

Explanation:

According to the doppler effect, the frequency of the wave will increase.

let u be the speed of the submarine,

let the speed of sound in water be c,

let initial frequency of the sent out wave be f,

let frequency of received wave be f'

The distance occupied by the new wave will be (c - u), therefore, the new wavelenght will be (c - u)/f

Frequency = speed of sound ÷ wavelenght

therefore the new Freq f' will be

f' = cf/(c - u) which will be shorter than the initial wavelenght.

But we do not know the speed of the submarine, so we can't estimate.

8 0

4 years ago