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2 years ago

6

Help my in science state of matter

2 answers:

Arada [10]2 years ago

7 0

I would say the last option, since with an increase in temperature, water molecules will speed up.

Bogdan [553]2 years ago

6 0

Answer:

me too last is best ig hgfvj

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According to Newton's third law, if you push on a wall, the wall ?

Lady bird [3.3K]

The wall will push back, in exactly the opposite direction, and with
exactly the same size force.

That's why the net force on the palm of your hand is zero, and that
in turn is the reason that your hand doesn't accelerate.

If you keep increasing the strength of your push, then eventually you
exceed the force that the wall is capable of delivering. Then the wall
crumbles and falls, your hand accelerates in the direction you're pushing,
and the crowd goes wild !

3 0

3 years ago

Read 2 more answers

A 800-gram grinding wheel 27.0 cm in diameter is in the shape of a uniform solid disk. (We can ignore the small hole at the cent

SSSSS [86.1K]

Explanation:

d = Diameter of wheel = 27 cm

r = Radius = $\frac{d}{2}=\frac{27}{2}=13.5\ cm$

m = Mass of wheel = 800 g

$\omega_i$ = Initial angular velocity = $245\times \frac{2\pi}{60}\ rad/s$

Equation of rotational motion

$\omega_f=\omega_i+\alpha t\\\Rightarrow \alpha=\frac{\omega_f-\omega_i}{t}\\\Rightarrow \alpha=\frac{0-245\times \frac{2\pi}{60}}{50}\\\Rightarrow \alpha=-0.51312\ rad/s^2$

Moment of inertia is given by

$M=\frac{1}{2}mr^2\\\Rightarrow M=\frac{1}{2}\times 0.8\times 0.135^2\\\Rightarrow M=0.00729\ kgm^2$

Torque is given by

$\tau=I\alpha\\\Rightarrow \tau=0.00729\times -0.51312\\\Rightarrow \tau=-0.0037406448\ Nm$

The torque the friction exerts is -0.0037406448 Nm

For more information on torque and moment of inertia refer

brainly.com/question/13936874

brainly.com/question/3406242

7 0

2 years ago

A student standing in a canyon yells "echo", and her voice produces a sound wave of frequency of f = 0.61 kHz. The echo takes t

klasskru [66]

Answer:

$d=627.9\ m$ is the distance from the obstacle of reflection.

wavelength $\lamb=0.5279\ m$

Explanation:

Given that:

frequency of sound, $f=610\ Hz$

time taken for the echo to be heard, $t=3.9\ s$

speed of sound, $v=322\ m.s^{-1}$

We know,

$\rm distance = speed \times time$

<em>During an echo the sound travels the same distance back and forth.</em>

$2d=v.t$

$2d=322\times 3.9$

$d=627.9\ m$ is the distance from the obstacle of reflection.

<u>Now the wavelength of sound waves:</u>

$\lambda=\frac{v}{f}$

$\lambda=\frac{322}{610}$

$\lamb=0.5279\ m$

3 0

2 years ago

What is an example of a chemical change that occurs as part of the rock cycle

kotykmax [81]

I am crossed between A and D but i think A is the correct one.

5 0

2 years ago

Read 2 more answers

A sheet of gold foil has a volume of 0.750 cm3. If the foil measures 50.0cm by 10.0cm, what is the thickness of the foil?

vlada-n [284]

To calculate the thickness of foil, we use formula of volume as

$V= l w t$

Here, l is the length of the foil, w is the width of the foil and t is the thickness of the foil.

Given, $V = 0.750 \ cm^3$ , $l = 50 cm$ and $w = 10 \ cm$ .

Substituting theses values in above equation, we get

$0.750 \ cm^3 = 50 cm \times 10 \ cm \times t \\\\ t = 0.0015 cm$

Thus, the thickness of the foil is 0.0015 cm.

6 0

3 years ago