A wave with a frequency of 230 Hz has a wavelength of 0.25 meters. At what speed will this wave travel?

An oil drop with a mass of 8.3 grams and a charge of + 2.2 mC is floating 7.68 meters above a positively charged floor. What is

Alina [70]

Answer:

Correct answer: Q = 0.247 μC

Explanation:

Since the oil drop floats, this means that the weight of the drop and the Coulomb force are equal.

F = m · g drop's weight

Fc = k q Q / r² Coulomb force

where it was given:

k = 9 · 10⁹ N m²/C² dielectric constant,

q = 2.2 mC = 2.2 · 10⁻³ C drop's charge,

Q - floor's charge,

r = 7.68 m distance between drop and floor

m = 8.3 grams = 8.3 · 10⁻³ kg drop's weight

and g = 10 m/s²

F = Fc ⇒ k q Q / r² = m · g ⇒ Q = m · g · r²/ k · q

Q = 8.3 · 10⁻³ · 10 · 7.68² / 9 · 10⁹ · 2.2 · 10⁻³

Q = 24.72 · 10⁻⁸ C = 0.2472 · 10⁻⁶ C = 0.2472 μC

Q = 0.247 μC

God is with you!!!

8 0

3 years ago

Which of the following materials is necessary to stop an alpha particle? a. three feet of concrete c. single sheet of aluminum f

Nat2105 [25]

A single sheet of paper can stop an alpha particle

8 0

4 years ago

Read 2 more answers

Which of the following statements is/are true? Check all that apply. Check all that apply. The work done by a nonconservative fo

navik [9.2K]

Answer:

The work done by a nonconservative force depends on the path taken. TRUE

A nonconservative force permits a two-way conversion between kinetic and potential energies. TRUE

A potential energy function can be specified for a nonconservative force.

FALSE

The work done by a conservative force depends on the path taken.

FALSE

A conservative force permits a two-way conversion between kinetic and potential energies.

FALSE

A potential energy function can be specified for a conservative force.

TRUE

Explanation:

The work done by a nonconservative force depends on the path taken. TRUE

This kind of force can not be obtained from potential function so the work made by this kind of force depend of the path taken.

A nonconservative force permits a two-way conversion between kinetic and potential energies. TRUE

A nonconservative force permits conversion to kinetic energy plus potential energy during it made work over the system.

A potential energy function can be specified for a nonconservative force.

FALSE

Considering that the work made by kind of force depend of the taken path they can not be determined by a potential fuction.

The work done by a conservative force depends on the path taken.

FALSE

This asseveration is related with the previous one. So the conservative force can be deducted from a potential function thus their y work made do not depend of the path taken.

A conservative force permits a two-way conversion between kinetic and potential energies.

FALSE

This means that as conservative force is related from a potential function it only can modify the potential energy of the system.

A potential energy function can be specified for a conservative force.

TRUE

This is as consequence of the definition of conservative force that it can be determined from a potential function.

4 0

3 years ago

Its always "the boys got me" and never "how are the boys?" how are y'all doing boys ?? We are starting to get abused :(

Anna [14]

⛽ ⚡

4 0

3 years ago

Read 2 more answers

The magnetic flux through a metal ring varies with time t according to ΦB = at3 − bt2, where ΦB is in webers, a = 6.00 Wb s−3, b

pychu [463]

To solve this problem it is necessary to apply the second derivative of the function to find the maximum time reference and thus calculate the maximum voltage.

With the maximum voltage by Ohm's Law it is possible to find the maximum current.

Ohm's law defines that

E = I*R

Where,

I = Current

R= Resistance

On the other hand by faraday studies and the potential can be expressed at the rate of change of the electric flow, that is

$E = \frac{d\phi}{dt}$