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4 years ago

Why do objects heat up?

2 answers:

6 0

Objects heat up because the material you use or the matter atoms and molecules grouping atoms and energy causes the atoms and molecules always be in motion either bumping each other or vibrating back and forth

Artemon [7]4 years ago

3 0

Answer:

It depends on the object. Like electronics heat up cause the components in the electronics heat up producing heat.

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A star is moving toward the earth with a speed of 0.9 c (90% the speed of light). it emits light, which moves away from the star

Bad White [126]

The speed of light is constant in ALL frames of reference. That is 2.9 x10^8 m/s (290,000,000 m/s). It is independent of the motion of the light source.

8 0

4 years ago

Monochromatic x rays are incident on a crystal for which the spacing of the atomic planes is 0.440 nm . The first-order maximum

Sedaia [141]

Answer:

Wavelength of the x rays is $\lambda=2.79\times 10^{-10}\ m$

Explanation:

It is given that,

The inter planer spacing between the crystal planes, $d=0.44\ nm=0.44\times 10^{-9}\ m$

The first-order maximum in the Bragg reflection occurs when the incident and reflected x rays make an angle of 39.4 degrees with the crystal planes. According to the Bragg's condition, the first-order maximum is given by :

$d\ sin\theta=n\lambda$

n = 1

$d\ sin\theta=\lambda$

$0.44\times 10^{-9}\times \ sin(39.4)=\lambda$

$\lambda=2.79\times 10^{-10}\ m$

So, the wavelength of the x rays is $2.79\times 10^{-10}\ m$ . Hence, this is the required solution.

8 0

4 years ago

n object is undergoing uniform circular motion. Which of the following is/are true? I. The object is moving at constant velocity

Igoryamba

Explanation:

When an object is moving in a circular path, the motion of the object is called uniform circular motion. The object moves under the action of centripetal acceleration. It is given by :

$a=\dfrac{v^2}{r}$

r is the radius of circular path

v is the speed of the object

In uniform circular motion, the object moves with constant speed. Also, the velocity of the object keeps on changing because it changes direction at every instant of time. Also, the object is accelerating due to change in velocity.

So, the correct options are (b) and (c).

8 0

4 years ago

Mr. Adams asked his students to write the chemical symbol for the element zinc. He wrote the students’ answers on the whiteboar

m_a_m_a [10]

The chemical symbol for the element zinc is Zn.

<h3>What is element?</h3>

A chemical element is the one which reacts with other elements to form a compound.

Any chemical symbol must have its first letter written in Uppercase. If the element has two letter chemical symbol, then it should be written in lowercase.

Thus, the student wrote Zn as the chemical symbol of Zinc on the whiteboard.

Learn more about element.

brainly.com/question/13025901

#SPJ1

4 0

2 years ago

When is orange is the new black episodes come out

xenn [34]

Some are out but will be on Netflix June 17

3 0

4 years ago