3 years ago

Evaporation is a process that requires energy to occur

Physics

1 answer:

Anarel [89]3 years ago

8 0

Evaporation is a process that requires energy to occur endothermic reaction.

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if a 0.040-kg stone is whirled horizontally on the end of a 60-m string at a speed of 4.4 m/s, what is the centripetal force ? *

SSSSS [86.1K]

Answer:

0.013N

Explanation:

$F=\frac{mv^{2} }{r}$

m=0.04, v=4.4m/s, r=60

F=0.013 N

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3 years ago

A person drives north 3 blocks, then turns east and drives 3 blocks. The driver then turns south and drives 3 blocks. How could

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Answer:by driving east 3 blocks from the starting point

Explanation:)

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3 years ago

In the thomson model of the atom, where was the positive charge located?

Fudgin [204]

I don't know if you still need this, but here's an answer anyways.

It was a giant cloud of matter, with negatively charged electrons inside.

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3 years ago

during a _____, a substance mixes with another substance and changes into completely new substances with different properties.

Tatiana [17]

chemical change or chemical reaction

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3 years ago

Wire A and wire B are made from the same material and are under the same tension, but waves travel along string B at one-third t

Ahat [919]

Answer:

0.3 mm

Explanation:

$\rho$ = Density of material

$\mu$ = Linear density of the material = $\rho A$

Area = Area = $\pi r^2$

r = Radius

The velocity of a wave is given by

$v=\sqrt{\dfrac{T}{\mu}}\\\Rightarrow v=\sqrt{\dfrac{T}{\rho A}}\\\Rightarrow v=\sqrt{\dfrac{T}{\rho \pi r^2}}$

It can be seen that the velocity is inversly proportional to the radius

$v\propto \sqrt{\dfrac{1}{r^2}}\\\Rightarrow v\propto \dfrac{1}{r}$

So,

$\dfrac{v_a}{v_b}=\dfrac{r_b}{r_a}$

From the question

$v_b=\dfrac{1}{3}v_a$

$\\\Rightarrow \dfrac{v_a}{\dfrac{1}{3}v_a}=\dfrac{r_b}{0.1}\\\Rightarrow 3=\dfrac{r_b}{0.1}\\\Rightarrow r_b=3\times 0.1\\\Rightarrow r_b=0.3\ mm$

The radius of wire B is 0.3 mm

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4 years ago