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4 years ago

What best describes the direction of the electric field on a spherical equipotential surface?

Physics

1 answer:

Alla [95]4 years ago

4 0

Answer:

Perpendicular to the surface

Explanation:

- Electric field lines represent the direction of the electric field. The electric field lines also correspond to the direction along which the gradient of the electric potential is maximum.

- Equipotentials are lines or surfaces along which the electric potential is constant: the electric potential does not change moving along an equipotential surface.

Given the two definitions, equipotential lines are always perpendicular to the electric field lines. Therefore, in this problem, the direction of the electric field is perpendicular to the spherical equipotential surface.

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A bullet of mass 0.02 kg is fired by a gun of mass 20 kg. If the speed of the bullet is 150 ms -1,

wel

Answer:

0.15m/s

Explanation:

Momentum p = mv, must be conserved if there are no external forces acting on the system. Since there are only internal forces acting between the bullet and the gun, momentum must be conserved.

The total momentum before the gun is fired:

$p = m_{bullet}v_{bullet} + m_{gun}v_{gun} = 0.02 * 0 + 20 * 0 = 0$

The total momentum after the gun is fired, must also be zero:

$p = m_{bullet}v_{bullet} + m_{gun}v_{gun} = 0.02 * 150 + 20 * v_{gun} = 0$

Solving for v:

$v_{gun}=-\frac{m_{bullet}v_{bullet}}{m_{gun}} = -\frac{0.02*150}{20} =-0.15$

The recoil speed is the absolute value of the velocity.

7 0

3 years ago

When does gravitational lensing occur? High concentrations of dark matter cause length contraction of nearby objects. The gravit

Stella [2.4K]

Answer:

A massive object (like a galaxy cluster) bends the light from an object (like a quasar) that lies behind it.

Explanation:

A massive object, like a galaxy cluster, is able to deform the space-time shape as a consequence of its own gravity, so the light that it is coming from a source that is behind it in the line of sight will be bend or distorts in a way that will be magnified, making small arcs around the cluster with the image of the background object.

This technique is useful for astronomers since they make research of faraway objects (at hight redshift) that otherwise will difficult to detect with a telescope.

4 0

4 years ago

Radio waves have a _____ frequency and a _____ wavelength.

Semenov [28]

Radio waves have a low frequency and a long wavelength. (A. low; long)

Explanation:

Electromagnetic waves are periodic oscillations of the the electric and the magnetic field in a plane perpendicular to the direction of motion the wave.

All electromagnetic waves travel in a vacuum at the same speed, which is known as the speed of light:

$c=3.0\cdot 10^8 m/s$

Electromagnetic waves are also divided into 7 different types, according to their wavelength and frequency. From shortest to longest wavelength (and therefore, from highest to lowest frequency), we have:

Gamma rays

X rays

Ultraviolet

Visible light

Infrared radiation

Microwaves

Radio waves

As we can see from the list, radio waves are the waves with lowest frequency and longest wavelength. They are used in telecommunications, satellite communications, and in general in long-distance transmission of signals. So, the correct answer is

Radio waves have a low frequency and a long wavelength.

Learn more about electromagnetic waves:

brainly.com/question/9184100

brainly.com/question/12450147

#LearnwithBrainly

3 0

3 years ago

A fisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surfac

taurus [48]

Answer:

a. Speed = 1.6 m/s

b. Amplitude = 0.3 m

c. Speed = 1.6 m/s

Amplitude = 0.15 m

Explanation:

The frequency of the wave must be equal to the reciprocal of the time taken by the boat to move from the highest point to the highest point again. This time will be twice the value of the time taken to travel from the highest point to the lowest point:

frequency = $\frac{1}{2(2\ s)}$ = 0.25 Hz

The wavelength of the wave is the distance between consecutive crests of the wave. Therefore,

Wavelength = 6.4 m

Now, the speed of the wave is given as:

Speed = (Frequency)(Wavelength)

Speed = (0.25 Hz)(6.4 m)

Speed = 1.6 m/s

Amplitude is the distance between the mean position of the wave and the extreme position. Hence, it will be half the distance between the highest and lowest point:

Amplitude = (0.5)(0.6 m)

Amplitude = 0.3 m

frequency = $\frac{1}{2(2\ s)}$ = 0.25 Hz

Speed = (Frequency)(Wavelength)

Speed = (0.25 Hz)(6.4 m)

Speed = 1.6 m/s

Amplitude = (0.5)(0.3 m)

Amplitude = 0.15 m

6 0

3 years ago

What is the total number of electrons transported from the positive electrode to the negative electrode from the time the batter

katovenus [111]

Answer:

16200

Explanation:

4 0

4 years ago