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3 years ago

How do modern scientist describe the make up of matter

Physics

1 answer:

lbvjy [14]3 years ago

4 0

The matter is a collection or composition of extremely small particles called "Atoms".

<u>Explanation</u>:

The matter is anything that has mass and which utilizes space by having volume.
Modern scientists describe the makeup of matter as a collection of tiny substances called atoms.
Matter can either be in solid, liquid, or gaseous state and even appear in plasma form.
Matter can neither be created nor be destroyed but only transferred from one form to the other.
Atoms are composed protons, neutrons and electrons. The protons and neutrons are contained in the nucleus, while the electrons orbit around the nucleus of the atom.
Protons are positively charged, neutrons are neutral and electrons are negative.

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A disc on a frictionless axle, starting from rest (0 rpm) can spin up to a rotation rate of 3820 rpm in a period of 2 seconds. (

Eddi Din [679]

Answer:

1000 Nm

2000 Nm

1.00007 seconds

Explanation:

I = Moment of inertia = 5 kgm²

$\alpha$ = Angular acceleration

$\omega_f$ = Final angular velocity

$\omega_i$ = Initial angular velocity

t = Time taken

Torque is given by

$\tau=I\alpha\\\Rightarrow \tau=5\times 200\\\Rightarrow \tau=1000\ Nm$

The torque of the disc would be 1000 Nm

If $\alpha=400\ rad/s^2$

$\tau=I\alpha\\\Rightarrow \tau=5\times 400\\\Rightarrow \tau=2000\ Nm$

The torque of the disc would be 2000 Nm

From equation of rotational motion

$\omega_f=\omega_i+\alpha t\\\Rightarrow t=\frac{\omega_f-\omega_i}{\alpha}\\\Rightarrow t=\frac{3820\times \frac{2\pi}{60}-0}{400}\\\Rightarrow t=1.00007\ s$

It would take 1.00007 seconds to reach 3820 rpm

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4 years ago