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pishuonlain [190]

3 years ago

9

Describe ehat happens at the molecular level during meilting

1 answer:

Marta_Voda [28]3 years ago

3 0

The molecules of a solid vibrate faster so that they start spreading out to become a liquid. This energy makes them vibrate faster so the bonds between molecules can't interact all that well anymore creating more distance. The stronger the bonds between the molecules the higher the energy (temperature) has to be to get them away from each other. Hope I didn't confuse you too much!

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If the temperature of the solar surface is 5800 K and Wien's law for the peak wavelength of the spectrum of the Sun, assumed to

enot [183]

Answer:

The dominant wavelength of the sun is $499.65nm$

Explanation:

Wien's law is defined as:

$\lambda_{max} T = c$ (1)

Where $\lambda_{max}$ is the maximum wavelength, c is the Wien's constant and T is the temperature.

Therefore, $\lambda_{max}$ can be isolated from equation 1.

$\lambda_{max} = \frac{c}{T}$ (2)

$\lambda_{max} = \frac{2.898x10^{-3}m\cdot K}{T}$

Notice that it is necessary to express the Wien's constant in units of meters

$c = 2.898x10^{-3}m\cdot K . \frac{1x10^{9}nm}{m}$ ⇒ $2.898x10^{6} nm \cdot K$

Finally, equation 2 can be used:

$\lambda_{max} = \frac{2.898x10^{6} nm \cdot K}{5800 K}$

$\lambda_{max} = 499.65nm$

Hence, the dominant wavelength of the sun is $499.65nm$

6 0

3 years ago

Problem 5 A block of mass 3 kg slides on a horizontal, rough surface towards a spring with k = 500 N/m. The kinetic friction coe

vredina [299]

Answer:

Explanation:

given,

mass of block = 3 kg

spring constant k = 500 N/m

kinetic friction coefficient µk = 0.6

speed of block = 5 m/s

F = µk N

F = 0.6 x 3 x 9.8

F = 17.64 N

using energy conservation

$\dfrac{1}{2}mv^2=\dfrac{1}{2}kx^2+Fx$

$\dfrac{1}{2}\times 3 \times 5^2=\dfrac{1}{2}\times 500 \times x^2+17.64\times x$

250 x² + 17.64 x - 37.5 = 0

on solving

x = 0.354 m

graph is attached below

4 0

4 years ago

Read 2 more answers

Based on Kepler's work, which best describes the orbit If a planet around the Sun?

krek1111 [17]

Answer:

an ellipse with the Sun at one focus or D

Explanation:

Answer for edgenuity

7 0

3 years ago

A teacher explains that a scientist named Boyle did many experiments to determine what the relationship is between the volume an

lina2011 [118]

<span>Boyle's Law, because it describes what will happen in the relationship between the pressure and volume of the gas.</span>

4 0

3 years ago

Huck Finn walks at a speed of 0.70 m/s across his raft (that is, he walks perpendicular to the raft’s motion relative to the sho

ZanzabumX [31]

Answer

given,

Hunk Finn speed,v_y= 0.7 m/s

Speed of river,v_x = 1.50 m/s

Assuming the speed of the river is in x-direction.

Speed of Hunk Finn to be in y-direction.

Hunk velocity relative to river =

$x = \sqrt{v_y^2+v_x^2}$

$x = \sqrt{2.74}$

$x =1.66\ m/s$

Speed of Hunk relative to river = 1.66 m/s

direction of the boat

$\theta =tan^{-1}(\dfrac{v_y}{v_x})$

$\theta =tan^{-1}(\dfrac{0.7}{1.50})$

$\theta = 25.01^{\circ}$

Hence, angle of the raft is 24.01°

6 0

4 years ago