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3 years ago

I know the answer, but just so I don't get it wrong on study island:

2 answers:

8 0

(D is the answer and here is why) "Aug. 24, 2006: Pluto Deplanetized. 2006: Pluto, once the ninth planet from the sun, is downgraded to a mere "dwarf planet." Our solar system loses a favorite kid brother and now has, officially, only eight planets."

Pavel [41]3 years ago

3 0

In 2006, the International Astronomical Union created a new category of object in the solar system. The first object to be listed in that category was Pluto, and several more have been discovered and included since then.

The category is "Dwarf Planet" .

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The atomic number, or ________ number, is the described as the number of _________ in the nucleus of an chemical element. A) pro

Alenkinab [10]

i think it is a and c idk

4 0

3 years ago

Read 2 more answers

The speed of light is about 3.00 × 10 meters per second. What is the frequency of green light that has a wavelength about 500 na

RideAnS [48]

Answer:

The frequency of the green light is $6x10^{14}Hz$

Explanation:

The visible region is part of the electromagnetic spectrum, any radiation of that electromagnetic spectrum has a speed of $3.00x10^{8}m/s$ in the vacuum.

Green light is part of the visible region. Therefore, the frequency can be determined by the following equation:

$c = \lambda \cdot \nu$ (1)

Where c is the speed of light, $\lambda$ is the wavelength and $\nu$ is the frequency.

Notice that since it is electromagnetic radiation, equation 1 can be used. Remember that light propagates in the form of an electromagnetic wave (that is a magnetic field perpendicular to an electric field).

Then, $\nu$ can be isolated from equation 1

$\nu = \frac{c}{\lambda}$ (2)

Notice that it is necessary to express the wavelength in units of meters.

$\lambda = 500nm . \frac{1m}{1x10^{9}nm}$ ⇒ $5x10^{-7}m$

$\nu = \frac{3.00x10^{8}m/s}{5x10^{-7}m}$

$\nu = 6x10^{14}s^{-1}$

$\nu = 6x10^{14}Hz$

Hence, the frequency of the green light is $6x10^{14}Hz$

4 0

4 years ago

visible light is a range of ____ energy EM waves in the electromagnetic spectrum that the human eye can see

Artemon [7]

A range of infrared wavelengths <span />

4 0

3 years ago

An electrical appliance draws 9.0 amperes of current when connected to a 120-volt

Lemur [1.5K]

Answer:

The correct answer is "1080 W".

Explanation:

Given:

Current,

I = 9.0 A

Potential difference,

V = 120 volt

As we know,

⇒ $Power=IV$

On substituting the values, we get

⇒ $=120\times 9.0$

⇒ $=1080 \ W$

4 0

3 years ago

The angle θ is slowly increased. Write an expression for the angle at which the block begins to move in terms of μs.

Reika [66]

Answer:

$tan \theta = \mu_s$

Explanation:

An object is at rest along a slope if the net force acting on it is zero. The equation of the forces along the direction parallel to the slope is:

$mg sin \theta - \mu_s R =0$ (1)

where

$mg sin \theta$ is the component of the weight parallel to the slope, with m being the mass of the object, g the acceleration of gravity, $\theta$ the angle of the slope

$\mu_s R$ is the frictional force, with $\mu_s$ being the coefficient of friction and R the normal reaction of the incline

The equation of the forces along the direction perpendicular to the slope is

$R-mg cos \theta = 0$

where

R is the normal reaction

$mg cos \theta$ is the component of the weight perpendicular to the slope

Solving for R,

$R=mg cos \theta$

And substituting into (1)

$mg sin \theta - \mu_s mg cos \theta = 0$

Re-arranging the equation,

$sin \theta = \mu_s cos \theta\\\rightarrow tan \theta = \mu_s$

This the condition at which the equilibrium holds: when the tangent of the angle becomes larger than the value of $\mu_s$ , the force of friction is no longer able to balance the component of the weight parallel to the slope, and so the object starts sliding down.

4 0

4 years ago