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3 years ago

Who is the greek philisopher who came up with the idea that atoms exist

Physics

1 answer:

Mariulka [41]3 years ago

4 0

Greek philosophers Leucippus and Democritus first developed the concept of the atom in the 5th century B.C.E.

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All of the following show friction as a useful force, except

Troyanec [42]

having to push a rough and heavy box across the floor to move it

Explanation:

Friction is not a useful force because we have to exert even more force to push a body that is rough and heavy across the floor to move it.

Frictional force is a force that opposes the motion of a body.
It costs more and uses more energy to push a rough and heavy box on surface because of friction.
This wastes energy in systems that deals with pushing.

Friction is useful in that:

the heat energy produced when two surfaces rub together is very useful.
the friction between your feet and the floor keeping you from slipping and makes walking possible.
the tread on tires helping the moving vehicle slow down and stop when necessary.

learn more:

Friction brainly.com/question/7174363

#learnwithBrainly

3 0

3 years ago

Two particles with charges of 2nC and 5nC are separated by a distance of 3m. The charge 2nC is placed on the left. Find the forc

Vanyuwa [196]

Answer:

$1\cdot 10^{-8} N$ to the left

Explanation:

The magnitude of the electrostatic force between two charges is given by the following equation:

$F=k\frac{q_1 q_2}{r^2}$

where:

$k=9\cdot 10^9 Nm^{-2}C^{-2}$ is the Coulomb's constant

$q_1, q_2$ are the magnitude of the two charges

r is the distance between the two charges

Moreover, the force is:

- Attractive if the charges have opposite sign

- Repulsive if the charges have same sign

In this problem, we have:

$q_1=2nC=2\cdot 10^{-9}C$ is the magnitude of charge 1

$q_2=5nC =5\cdot 10^{-9}C$ is the magnitude of charge 2

r = 3 m is the distance between the two charges

Substituting, we find the force on both charges:

$F=\frac{(9\cdot 10^9)(5\cdot 10^{-9})(2\cdot 10^{-9}}{3^2}=1\cdot 10^{-8} N$

Here, the two charges are both positive, so the force is repulsive; since the 2 nC charge is on the left, this means that the force on this charge is to the left (away from the 5 nC charge).

5 0

3 years ago

1<br> 2<br> 3<br> What would happen if Bulb 1 goes out?

aleksandrvk [35]

Answer:

it will explode

Explanation:

because it will explode

5 0

3 years ago

Basketball= What is the half of the court that is farthest from the offensive basket?

klasskru [66]

The answer would be half court I think

6 0

3 years ago

Where would a Christmas tree be most likely to grow?

sveticcg [70]

Taiga is the answer.

Hope it helps!

3 0

3 years ago