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3 years ago

2. A medical imaging device shoots 8 million electrons per second through an Ohmic gas.

Physics

2 answers:

sergey [27]3 years ago

5 0

Answer:

about 2.34 PΩ

Explanation:

One electron is 1.602176634×10^−19 coulomb, so 8×10^6 electrons per second is ...

(8×10^6)(1.602176634×10^−19) amperes ≈ 1.28174×10^-12 amperes

Then the resistance is ...

R = V/I = 3000/(1.28174×10^-12) ≈ 2.34×10^15 . . . ohms

The SI prefix corresponding to 10^15 is "peta-", so this is ...

2.34 PΩ

Radda [10]3 years ago

3 0

That's more than ohms law because we have to convert 8 million electrons per second to a current.

One electron has a charge of 1.602 × 10⁻¹⁹ coulombs so 8 million = 8×10⁶ have a charge of

q = 8×10⁶ × 1.6 × 10⁻¹⁹ = 1.3×10⁻¹²

Since that goes by in one second, that's also the current in amps,

I = 1.3×10⁻¹² amps

That's a tiny current. If that flowed across 3000 Volts that implies a resistance of

R = V/I = 3000/1.3×10⁻¹² = 2.3 × 10¹⁵ ohms

That's a giant resistance.

These numbers don't seem all that realistic but I think it's right.

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OleMash [197]

Get a direct answer of what???

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4 years ago

An alpha particle can be produced in certain radioactive decays of nuclei and consists of two protons and two neutrons. The part

Varvara68 [4.7K]

Answer:

Explanation:

charge, q = 2e = 2 x 1.6 x 10^-19 C = 3.2 x 10^-19 C

mass, m = 4 u = 4 x 1.661 x 10^-27 kg = 6.644 x 10^-27 kg

Radius, r = 4.5 cm = 0.045 m

Magnetic field, B = 1.20 T

(a) Let the speed is v.

$v=\frac{Bqr}{m}$

$v=\frac{1.20\times 3.2\times 10^{-19}\times 0.045}{6.644\times 10^{-27}}$

v = 2.6 x 10^6 m/s

(b) Let T be the period of revolution

$T=\frac{2\pi r}{v}$

$T=\frac{2\times 3.14\times 0.045}{2.6\times 10^{6}}$

T = 1.09 x 10^-7 s

$K=\frac{B^{2}\times q^{2}\times r^{2}}{2m}$

$K=\frac{\left ( 1.20\times 3.2 \times 10^{-19}\times 0.045 \right )^{2}}{2\times 6.644\times 10^{-27}}$

K = 2.25 x 10^-14 J

(d) Let the potential difference is V.

K = qV

$V = \frac{K}{q}$

$V= \frac{2.25\times 10^-14}{3.2\times 10^{-19}}$

V = 70312.5 V

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3 years ago

How do i solve A sound wave has a frequency of 658 Hz in air

kiruha [24]

Answer:

-47 °C

Explanation:

Speed of sound in air at sea level is:

v = 331 m/s + 0.6 m/s/°C T

where T is the temperature in Celsius.

The speed of sound is also the frequency times the wavelength:

v = fλ

Therefore:

fλ = 331 m/s + 0.6 m/s/°C T

(658 Hz) (0.46 m) = 331 m/s + 0.6 m/s/°C T

302.68 m/s = 331 m/s + 0.6 m/s/°C T

-28.32 m/s = 0.6 m/s/°C T

T = -47.2 °C

Rounding to two significant figures, the temperature is -47 °C.

6 0

3 years ago

What is the mass moment of inertia of a 20kg sphere with a radius of 0.2m about a point on the sphere's perimeter

Kobotan [32]

Answer:

I = M R^2 is the moment of inertia about a point that is a distance R from the center of mass (uniform distributed mass).

The moment of inertia about the center of a sphere is 2 / 5 M R^2.

By the parallel axis theorem the moment of inertia about a point on the rim of the sphere is I = 2/5 M R^2 + M R^2 = 7/5 M R^2

I = 7/5 * 20 kg * .2^2 m = 1.12 kg m^2

7 0

3 years ago

A famous physics tale is about a rich man who was found dead. He was

anyanavicka [17]

<h2>Answer: C) He could have thrown the bag of money sideways, creating a horizontal reaction force on himself.</h2>

Explanation:

According to Newton's third law of motion, when two bodies interact between them, appear equal forces and opposite senses in each of them.

To understand it better:

Each time a body or object exerts a force on a second body or object, it (the second body) will exert a force of equal magnitude and direction but in the opposite direction on the first.

So, if the rich man had pushed the bag of money horizontally opposite of where he was, he could have saved himself.

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3 years ago